mirror of
https://github.com/git/git.git
synced 2024-12-14 04:18:16 +08:00
c5fcd34e1b
Mark-up unused parameters in the code so that we can eventually enable -Wunused-parameter by default. * jk/unused-parameter: t/helper: mark unused callback void data parameters tag: mark unused parameters in each_tag_name_fn callbacks rev-parse: mark unused parameter in for_each_abbrev callback replace: mark unused parameter in each_mergetag_fn callback replace: mark unused parameter in ref callback merge-tree: mark unused parameter in traverse callback fsck: mark unused parameters in various fsck callbacks revisions: drop unused "opt" parameter in "tweak" callbacks count-objects: mark unused parameter in alternates callback am: mark unused keep_cr parameters http-push: mark unused parameter in xml callback http: mark unused parameters in curl callbacks do_for_each_ref_helper(): mark unused repository parameter test-ref-store: drop unimplemented reflog-expire command
2825 lines
70 KiB
C
2825 lines
70 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*
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* This handles basic git object files - packing, unpacking,
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* creation etc.
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*/
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#include "git-compat-util.h"
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#include "abspath.h"
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#include "config.h"
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#include "convert.h"
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#include "environment.h"
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#include "gettext.h"
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#include "hex.h"
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#include "string-list.h"
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#include "lockfile.h"
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#include "delta.h"
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#include "pack.h"
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#include "blob.h"
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#include "commit.h"
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#include "run-command.h"
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#include "tag.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "refs.h"
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#include "pack-revindex.h"
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#include "hash-lookup.h"
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#include "bulk-checkin.h"
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#include "repository.h"
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#include "replace-object.h"
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#include "streaming.h"
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#include "dir.h"
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#include "list.h"
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#include "mergesort.h"
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#include "quote.h"
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#include "packfile.h"
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#include "object-file.h"
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#include "object-store.h"
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#include "oidtree.h"
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#include "path.h"
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#include "promisor-remote.h"
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#include "setup.h"
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#include "submodule.h"
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#include "fsck.h"
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/* The maximum size for an object header. */
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#define MAX_HEADER_LEN 32
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#define EMPTY_TREE_SHA1_BIN_LITERAL \
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"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
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"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
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#define EMPTY_TREE_SHA256_BIN_LITERAL \
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"\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \
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"\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \
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"\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \
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"\x53\x21"
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#define EMPTY_BLOB_SHA1_BIN_LITERAL \
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"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
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"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
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#define EMPTY_BLOB_SHA256_BIN_LITERAL \
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"\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \
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"\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \
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"\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \
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"\x18\x13"
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static const struct object_id empty_tree_oid = {
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.hash = EMPTY_TREE_SHA1_BIN_LITERAL,
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.algo = GIT_HASH_SHA1,
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};
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static const struct object_id empty_blob_oid = {
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.hash = EMPTY_BLOB_SHA1_BIN_LITERAL,
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.algo = GIT_HASH_SHA1,
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};
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static const struct object_id null_oid_sha1 = {
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.hash = {0},
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.algo = GIT_HASH_SHA1,
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};
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static const struct object_id empty_tree_oid_sha256 = {
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.hash = EMPTY_TREE_SHA256_BIN_LITERAL,
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.algo = GIT_HASH_SHA256,
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};
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static const struct object_id empty_blob_oid_sha256 = {
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.hash = EMPTY_BLOB_SHA256_BIN_LITERAL,
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.algo = GIT_HASH_SHA256,
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};
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static const struct object_id null_oid_sha256 = {
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.hash = {0},
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.algo = GIT_HASH_SHA256,
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};
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static void git_hash_sha1_init(git_hash_ctx *ctx)
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{
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git_SHA1_Init(&ctx->sha1);
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}
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static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src)
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{
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git_SHA1_Clone(&dst->sha1, &src->sha1);
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}
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static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
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{
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git_SHA1_Update(&ctx->sha1, data, len);
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}
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static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
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{
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git_SHA1_Final(hash, &ctx->sha1);
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}
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static void git_hash_sha1_final_oid(struct object_id *oid, git_hash_ctx *ctx)
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{
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git_SHA1_Final(oid->hash, &ctx->sha1);
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memset(oid->hash + GIT_SHA1_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA1_RAWSZ);
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oid->algo = GIT_HASH_SHA1;
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}
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static void git_hash_sha256_init(git_hash_ctx *ctx)
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{
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git_SHA256_Init(&ctx->sha256);
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}
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static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src)
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{
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git_SHA256_Clone(&dst->sha256, &src->sha256);
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}
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static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
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{
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git_SHA256_Update(&ctx->sha256, data, len);
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}
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static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx)
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{
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git_SHA256_Final(hash, &ctx->sha256);
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}
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static void git_hash_sha256_final_oid(struct object_id *oid, git_hash_ctx *ctx)
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{
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git_SHA256_Final(oid->hash, &ctx->sha256);
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/*
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* This currently does nothing, so the compiler should optimize it out,
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* but keep it in case we extend the hash size again.
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*/
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memset(oid->hash + GIT_SHA256_RAWSZ, 0, GIT_MAX_RAWSZ - GIT_SHA256_RAWSZ);
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oid->algo = GIT_HASH_SHA256;
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}
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static void git_hash_unknown_init(git_hash_ctx *ctx UNUSED)
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{
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BUG("trying to init unknown hash");
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}
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static void git_hash_unknown_clone(git_hash_ctx *dst UNUSED,
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const git_hash_ctx *src UNUSED)
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{
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BUG("trying to clone unknown hash");
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}
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static void git_hash_unknown_update(git_hash_ctx *ctx UNUSED,
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const void *data UNUSED,
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size_t len UNUSED)
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{
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BUG("trying to update unknown hash");
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}
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static void git_hash_unknown_final(unsigned char *hash UNUSED,
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git_hash_ctx *ctx UNUSED)
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{
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BUG("trying to finalize unknown hash");
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}
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static void git_hash_unknown_final_oid(struct object_id *oid UNUSED,
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git_hash_ctx *ctx UNUSED)
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{
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BUG("trying to finalize unknown hash");
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}
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const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
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{
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.name = NULL,
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.format_id = 0x00000000,
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.rawsz = 0,
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.hexsz = 0,
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.blksz = 0,
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.init_fn = git_hash_unknown_init,
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.clone_fn = git_hash_unknown_clone,
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.update_fn = git_hash_unknown_update,
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.final_fn = git_hash_unknown_final,
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.final_oid_fn = git_hash_unknown_final_oid,
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.empty_tree = NULL,
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.empty_blob = NULL,
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.null_oid = NULL,
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},
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{
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.name = "sha1",
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.format_id = GIT_SHA1_FORMAT_ID,
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.rawsz = GIT_SHA1_RAWSZ,
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.hexsz = GIT_SHA1_HEXSZ,
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.blksz = GIT_SHA1_BLKSZ,
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.init_fn = git_hash_sha1_init,
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.clone_fn = git_hash_sha1_clone,
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.update_fn = git_hash_sha1_update,
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.final_fn = git_hash_sha1_final,
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.final_oid_fn = git_hash_sha1_final_oid,
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.empty_tree = &empty_tree_oid,
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.empty_blob = &empty_blob_oid,
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.null_oid = &null_oid_sha1,
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},
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{
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.name = "sha256",
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.format_id = GIT_SHA256_FORMAT_ID,
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.rawsz = GIT_SHA256_RAWSZ,
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.hexsz = GIT_SHA256_HEXSZ,
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.blksz = GIT_SHA256_BLKSZ,
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.init_fn = git_hash_sha256_init,
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.clone_fn = git_hash_sha256_clone,
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.update_fn = git_hash_sha256_update,
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.final_fn = git_hash_sha256_final,
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.final_oid_fn = git_hash_sha256_final_oid,
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.empty_tree = &empty_tree_oid_sha256,
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.empty_blob = &empty_blob_oid_sha256,
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.null_oid = &null_oid_sha256,
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}
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};
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const struct object_id *null_oid(void)
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{
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return the_hash_algo->null_oid;
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}
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const char *empty_tree_oid_hex(void)
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{
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static char buf[GIT_MAX_HEXSZ + 1];
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return oid_to_hex_r(buf, the_hash_algo->empty_tree);
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}
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const char *empty_blob_oid_hex(void)
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{
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static char buf[GIT_MAX_HEXSZ + 1];
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return oid_to_hex_r(buf, the_hash_algo->empty_blob);
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}
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int hash_algo_by_name(const char *name)
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{
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int i;
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if (!name)
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return GIT_HASH_UNKNOWN;
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for (i = 1; i < GIT_HASH_NALGOS; i++)
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if (!strcmp(name, hash_algos[i].name))
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return i;
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return GIT_HASH_UNKNOWN;
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}
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int hash_algo_by_id(uint32_t format_id)
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{
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int i;
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for (i = 1; i < GIT_HASH_NALGOS; i++)
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if (format_id == hash_algos[i].format_id)
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return i;
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return GIT_HASH_UNKNOWN;
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}
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int hash_algo_by_length(int len)
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{
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int i;
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for (i = 1; i < GIT_HASH_NALGOS; i++)
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if (len == hash_algos[i].rawsz)
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return i;
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return GIT_HASH_UNKNOWN;
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}
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/*
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* This is meant to hold a *small* number of objects that you would
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* want repo_read_object_file() to be able to return, but yet you do not want
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* to write them into the object store (e.g. a browse-only
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* application).
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*/
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static struct cached_object {
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struct object_id oid;
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enum object_type type;
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void *buf;
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unsigned long size;
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} *cached_objects;
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static int cached_object_nr, cached_object_alloc;
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static struct cached_object empty_tree = {
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.oid = {
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.hash = EMPTY_TREE_SHA1_BIN_LITERAL,
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},
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.type = OBJ_TREE,
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.buf = "",
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};
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static struct cached_object *find_cached_object(const struct object_id *oid)
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{
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int i;
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struct cached_object *co = cached_objects;
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for (i = 0; i < cached_object_nr; i++, co++) {
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if (oideq(&co->oid, oid))
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return co;
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}
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if (oideq(oid, the_hash_algo->empty_tree))
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return &empty_tree;
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return NULL;
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}
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static int get_conv_flags(unsigned flags)
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{
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if (flags & HASH_RENORMALIZE)
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return CONV_EOL_RENORMALIZE;
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else if (flags & HASH_WRITE_OBJECT)
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return global_conv_flags_eol | CONV_WRITE_OBJECT;
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else
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return 0;
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}
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int mkdir_in_gitdir(const char *path)
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{
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if (mkdir(path, 0777)) {
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int saved_errno = errno;
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struct stat st;
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struct strbuf sb = STRBUF_INIT;
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if (errno != EEXIST)
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return -1;
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/*
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* Are we looking at a path in a symlinked worktree
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* whose original repository does not yet have it?
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* e.g. .git/rr-cache pointing at its original
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* repository in which the user hasn't performed any
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* conflict resolution yet?
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*/
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if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
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strbuf_readlink(&sb, path, st.st_size) ||
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!is_absolute_path(sb.buf) ||
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mkdir(sb.buf, 0777)) {
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strbuf_release(&sb);
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errno = saved_errno;
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return -1;
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}
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strbuf_release(&sb);
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}
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return adjust_shared_perm(path);
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}
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static enum scld_error safe_create_leading_directories_1(char *path, int share)
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{
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char *next_component = path + offset_1st_component(path);
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enum scld_error ret = SCLD_OK;
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while (ret == SCLD_OK && next_component) {
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struct stat st;
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char *slash = next_component, slash_character;
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while (*slash && !is_dir_sep(*slash))
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slash++;
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if (!*slash)
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break;
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next_component = slash + 1;
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while (is_dir_sep(*next_component))
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next_component++;
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if (!*next_component)
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break;
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slash_character = *slash;
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*slash = '\0';
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if (!stat(path, &st)) {
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/* path exists */
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if (!S_ISDIR(st.st_mode)) {
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errno = ENOTDIR;
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ret = SCLD_EXISTS;
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}
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} else if (mkdir(path, 0777)) {
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if (errno == EEXIST &&
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!stat(path, &st) && S_ISDIR(st.st_mode))
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; /* somebody created it since we checked */
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else if (errno == ENOENT)
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/*
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* Either mkdir() failed because
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* somebody just pruned the containing
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* directory, or stat() failed because
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* the file that was in our way was
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* just removed. Either way, inform
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* the caller that it might be worth
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* trying again:
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*/
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ret = SCLD_VANISHED;
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else
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ret = SCLD_FAILED;
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} else if (share && adjust_shared_perm(path)) {
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ret = SCLD_PERMS;
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}
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*slash = slash_character;
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}
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return ret;
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}
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enum scld_error safe_create_leading_directories(char *path)
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{
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return safe_create_leading_directories_1(path, 1);
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}
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enum scld_error safe_create_leading_directories_no_share(char *path)
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{
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return safe_create_leading_directories_1(path, 0);
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}
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enum scld_error safe_create_leading_directories_const(const char *path)
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{
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int save_errno;
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/* path points to cache entries, so xstrdup before messing with it */
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char *buf = xstrdup(path);
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enum scld_error result = safe_create_leading_directories(buf);
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save_errno = errno;
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free(buf);
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errno = save_errno;
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return result;
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}
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static void fill_loose_path(struct strbuf *buf, const struct object_id *oid)
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{
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int i;
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for (i = 0; i < the_hash_algo->rawsz; i++) {
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static char hex[] = "0123456789abcdef";
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unsigned int val = oid->hash[i];
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strbuf_addch(buf, hex[val >> 4]);
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strbuf_addch(buf, hex[val & 0xf]);
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if (!i)
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strbuf_addch(buf, '/');
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}
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}
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static const char *odb_loose_path(struct object_directory *odb,
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struct strbuf *buf,
|
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const struct object_id *oid)
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{
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strbuf_reset(buf);
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strbuf_addstr(buf, odb->path);
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strbuf_addch(buf, '/');
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fill_loose_path(buf, oid);
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return buf->buf;
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}
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const char *loose_object_path(struct repository *r, struct strbuf *buf,
|
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const struct object_id *oid)
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{
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return odb_loose_path(r->objects->odb, buf, oid);
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}
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|
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/*
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* Return non-zero iff the path is usable as an alternate object database.
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*/
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static int alt_odb_usable(struct raw_object_store *o,
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struct strbuf *path,
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const char *normalized_objdir, khiter_t *pos)
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|
{
|
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int r;
|
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|
|
/* Detect cases where alternate disappeared */
|
|
if (!is_directory(path->buf)) {
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error(_("object directory %s does not exist; "
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"check .git/objects/info/alternates"),
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path->buf);
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return 0;
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}
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|
|
/*
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|
* Prevent the common mistake of listing the same
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* thing twice, or object directory itself.
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*/
|
|
if (!o->odb_by_path) {
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khiter_t p;
|
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|
|
o->odb_by_path = kh_init_odb_path_map();
|
|
assert(!o->odb->next);
|
|
p = kh_put_odb_path_map(o->odb_by_path, o->odb->path, &r);
|
|
assert(r == 1); /* never used */
|
|
kh_value(o->odb_by_path, p) = o->odb;
|
|
}
|
|
if (fspatheq(path->buf, normalized_objdir))
|
|
return 0;
|
|
*pos = kh_put_odb_path_map(o->odb_by_path, path->buf, &r);
|
|
/* r: 0 = exists, 1 = never used, 2 = deleted */
|
|
return r == 0 ? 0 : 1;
|
|
}
|
|
|
|
/*
|
|
* Prepare alternate object database registry.
|
|
*
|
|
* The variable alt_odb_list points at the list of struct
|
|
* object_directory. The elements on this list come from
|
|
* non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
|
|
* environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
|
|
* whose contents is similar to that environment variable but can be
|
|
* LF separated. Its base points at a statically allocated buffer that
|
|
* contains "/the/directory/corresponding/to/.git/objects/...", while
|
|
* its name points just after the slash at the end of ".git/objects/"
|
|
* in the example above, and has enough space to hold all hex characters
|
|
* of the object ID, an extra slash for the first level indirection, and
|
|
* the terminating NUL.
|
|
*/
|
|
static void read_info_alternates(struct repository *r,
|
|
const char *relative_base,
|
|
int depth);
|
|
static int link_alt_odb_entry(struct repository *r, const struct strbuf *entry,
|
|
const char *relative_base, int depth, const char *normalized_objdir)
|
|
{
|
|
struct object_directory *ent;
|
|
struct strbuf pathbuf = STRBUF_INIT;
|
|
struct strbuf tmp = STRBUF_INIT;
|
|
khiter_t pos;
|
|
int ret = -1;
|
|
|
|
if (!is_absolute_path(entry->buf) && relative_base) {
|
|
strbuf_realpath(&pathbuf, relative_base, 1);
|
|
strbuf_addch(&pathbuf, '/');
|
|
}
|
|
strbuf_addbuf(&pathbuf, entry);
|
|
|
|
if (!strbuf_realpath(&tmp, pathbuf.buf, 0)) {
|
|
error(_("unable to normalize alternate object path: %s"),
|
|
pathbuf.buf);
|
|
goto error;
|
|
}
|
|
strbuf_swap(&pathbuf, &tmp);
|
|
|
|
/*
|
|
* The trailing slash after the directory name is given by
|
|
* this function at the end. Remove duplicates.
|
|
*/
|
|
while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
|
|
strbuf_setlen(&pathbuf, pathbuf.len - 1);
|
|
|
|
if (!alt_odb_usable(r->objects, &pathbuf, normalized_objdir, &pos))
|
|
goto error;
|
|
|
|
CALLOC_ARRAY(ent, 1);
|
|
/* pathbuf.buf is already in r->objects->odb_by_path */
|
|
ent->path = strbuf_detach(&pathbuf, NULL);
|
|
|
|
/* add the alternate entry */
|
|
*r->objects->odb_tail = ent;
|
|
r->objects->odb_tail = &(ent->next);
|
|
ent->next = NULL;
|
|
assert(r->objects->odb_by_path);
|
|
kh_value(r->objects->odb_by_path, pos) = ent;
|
|
|
|
/* recursively add alternates */
|
|
read_info_alternates(r, ent->path, depth + 1);
|
|
ret = 0;
|
|
error:
|
|
strbuf_release(&tmp);
|
|
strbuf_release(&pathbuf);
|
|
return ret;
|
|
}
|
|
|
|
static const char *parse_alt_odb_entry(const char *string,
|
|
int sep,
|
|
struct strbuf *out)
|
|
{
|
|
const char *end;
|
|
|
|
strbuf_reset(out);
|
|
|
|
if (*string == '#') {
|
|
/* comment; consume up to next separator */
|
|
end = strchrnul(string, sep);
|
|
} else if (*string == '"' && !unquote_c_style(out, string, &end)) {
|
|
/*
|
|
* quoted path; unquote_c_style has copied the
|
|
* data for us and set "end". Broken quoting (e.g.,
|
|
* an entry that doesn't end with a quote) falls
|
|
* back to the unquoted case below.
|
|
*/
|
|
} else {
|
|
/* normal, unquoted path */
|
|
end = strchrnul(string, sep);
|
|
strbuf_add(out, string, end - string);
|
|
}
|
|
|
|
if (*end)
|
|
end++;
|
|
return end;
|
|
}
|
|
|
|
static void link_alt_odb_entries(struct repository *r, const char *alt,
|
|
int sep, const char *relative_base, int depth)
|
|
{
|
|
struct strbuf objdirbuf = STRBUF_INIT;
|
|
struct strbuf entry = STRBUF_INIT;
|
|
|
|
if (!alt || !*alt)
|
|
return;
|
|
|
|
if (depth > 5) {
|
|
error(_("%s: ignoring alternate object stores, nesting too deep"),
|
|
relative_base);
|
|
return;
|
|
}
|
|
|
|
strbuf_realpath(&objdirbuf, r->objects->odb->path, 1);
|
|
|
|
while (*alt) {
|
|
alt = parse_alt_odb_entry(alt, sep, &entry);
|
|
if (!entry.len)
|
|
continue;
|
|
link_alt_odb_entry(r, &entry,
|
|
relative_base, depth, objdirbuf.buf);
|
|
}
|
|
strbuf_release(&entry);
|
|
strbuf_release(&objdirbuf);
|
|
}
|
|
|
|
static void read_info_alternates(struct repository *r,
|
|
const char *relative_base,
|
|
int depth)
|
|
{
|
|
char *path;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
path = xstrfmt("%s/info/alternates", relative_base);
|
|
if (strbuf_read_file(&buf, path, 1024) < 0) {
|
|
warn_on_fopen_errors(path);
|
|
free(path);
|
|
return;
|
|
}
|
|
|
|
link_alt_odb_entries(r, buf.buf, '\n', relative_base, depth);
|
|
strbuf_release(&buf);
|
|
free(path);
|
|
}
|
|
|
|
void add_to_alternates_file(const char *reference)
|
|
{
|
|
struct lock_file lock = LOCK_INIT;
|
|
char *alts = git_pathdup("objects/info/alternates");
|
|
FILE *in, *out;
|
|
int found = 0;
|
|
|
|
hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
|
|
out = fdopen_lock_file(&lock, "w");
|
|
if (!out)
|
|
die_errno(_("unable to fdopen alternates lockfile"));
|
|
|
|
in = fopen(alts, "r");
|
|
if (in) {
|
|
struct strbuf line = STRBUF_INIT;
|
|
|
|
while (strbuf_getline(&line, in) != EOF) {
|
|
if (!strcmp(reference, line.buf)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
fprintf_or_die(out, "%s\n", line.buf);
|
|
}
|
|
|
|
strbuf_release(&line);
|
|
fclose(in);
|
|
}
|
|
else if (errno != ENOENT)
|
|
die_errno(_("unable to read alternates file"));
|
|
|
|
if (found) {
|
|
rollback_lock_file(&lock);
|
|
} else {
|
|
fprintf_or_die(out, "%s\n", reference);
|
|
if (commit_lock_file(&lock))
|
|
die_errno(_("unable to move new alternates file into place"));
|
|
if (the_repository->objects->loaded_alternates)
|
|
link_alt_odb_entries(the_repository, reference,
|
|
'\n', NULL, 0);
|
|
}
|
|
free(alts);
|
|
}
|
|
|
|
void add_to_alternates_memory(const char *reference)
|
|
{
|
|
/*
|
|
* Make sure alternates are initialized, or else our entry may be
|
|
* overwritten when they are.
|
|
*/
|
|
prepare_alt_odb(the_repository);
|
|
|
|
link_alt_odb_entries(the_repository, reference,
|
|
'\n', NULL, 0);
|
|
}
|
|
|
|
struct object_directory *set_temporary_primary_odb(const char *dir, int will_destroy)
|
|
{
|
|
struct object_directory *new_odb;
|
|
|
|
/*
|
|
* Make sure alternates are initialized, or else our entry may be
|
|
* overwritten when they are.
|
|
*/
|
|
prepare_alt_odb(the_repository);
|
|
|
|
/*
|
|
* Make a new primary odb and link the old primary ODB in as an
|
|
* alternate
|
|
*/
|
|
new_odb = xcalloc(1, sizeof(*new_odb));
|
|
new_odb->path = xstrdup(dir);
|
|
|
|
/*
|
|
* Disable ref updates while a temporary odb is active, since
|
|
* the objects in the database may roll back.
|
|
*/
|
|
new_odb->disable_ref_updates = 1;
|
|
new_odb->will_destroy = will_destroy;
|
|
new_odb->next = the_repository->objects->odb;
|
|
the_repository->objects->odb = new_odb;
|
|
return new_odb->next;
|
|
}
|
|
|
|
void restore_primary_odb(struct object_directory *restore_odb, const char *old_path)
|
|
{
|
|
struct object_directory *cur_odb = the_repository->objects->odb;
|
|
|
|
if (strcmp(old_path, cur_odb->path))
|
|
BUG("expected %s as primary object store; found %s",
|
|
old_path, cur_odb->path);
|
|
|
|
if (cur_odb->next != restore_odb)
|
|
BUG("we expect the old primary object store to be the first alternate");
|
|
|
|
the_repository->objects->odb = restore_odb;
|
|
free_object_directory(cur_odb);
|
|
}
|
|
|
|
/*
|
|
* Compute the exact path an alternate is at and returns it. In case of
|
|
* error NULL is returned and the human readable error is added to `err`
|
|
* `path` may be relative and should point to $GIT_DIR.
|
|
* `err` must not be null.
|
|
*/
|
|
char *compute_alternate_path(const char *path, struct strbuf *err)
|
|
{
|
|
char *ref_git = NULL;
|
|
const char *repo;
|
|
int seen_error = 0;
|
|
|
|
ref_git = real_pathdup(path, 0);
|
|
if (!ref_git) {
|
|
seen_error = 1;
|
|
strbuf_addf(err, _("path '%s' does not exist"), path);
|
|
goto out;
|
|
}
|
|
|
|
repo = read_gitfile(ref_git);
|
|
if (!repo)
|
|
repo = read_gitfile(mkpath("%s/.git", ref_git));
|
|
if (repo) {
|
|
free(ref_git);
|
|
ref_git = xstrdup(repo);
|
|
}
|
|
|
|
if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
|
|
char *ref_git_git = mkpathdup("%s/.git", ref_git);
|
|
free(ref_git);
|
|
ref_git = ref_git_git;
|
|
} else if (!is_directory(mkpath("%s/objects", ref_git))) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
seen_error = 1;
|
|
if (get_common_dir(&sb, ref_git)) {
|
|
strbuf_addf(err,
|
|
_("reference repository '%s' as a linked "
|
|
"checkout is not supported yet."),
|
|
path);
|
|
goto out;
|
|
}
|
|
|
|
strbuf_addf(err, _("reference repository '%s' is not a "
|
|
"local repository."), path);
|
|
goto out;
|
|
}
|
|
|
|
if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
|
|
strbuf_addf(err, _("reference repository '%s' is shallow"),
|
|
path);
|
|
seen_error = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
|
|
strbuf_addf(err,
|
|
_("reference repository '%s' is grafted"),
|
|
path);
|
|
seen_error = 1;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (seen_error) {
|
|
FREE_AND_NULL(ref_git);
|
|
}
|
|
|
|
return ref_git;
|
|
}
|
|
|
|
struct object_directory *find_odb(struct repository *r, const char *obj_dir)
|
|
{
|
|
struct object_directory *odb;
|
|
char *obj_dir_real = real_pathdup(obj_dir, 1);
|
|
struct strbuf odb_path_real = STRBUF_INIT;
|
|
|
|
prepare_alt_odb(r);
|
|
for (odb = r->objects->odb; odb; odb = odb->next) {
|
|
strbuf_realpath(&odb_path_real, odb->path, 1);
|
|
if (!strcmp(obj_dir_real, odb_path_real.buf))
|
|
break;
|
|
}
|
|
|
|
free(obj_dir_real);
|
|
strbuf_release(&odb_path_real);
|
|
|
|
if (!odb)
|
|
die(_("could not find object directory matching %s"), obj_dir);
|
|
return odb;
|
|
}
|
|
|
|
static void fill_alternate_refs_command(struct child_process *cmd,
|
|
const char *repo_path)
|
|
{
|
|
const char *value;
|
|
|
|
if (!git_config_get_value("core.alternateRefsCommand", &value)) {
|
|
cmd->use_shell = 1;
|
|
|
|
strvec_push(&cmd->args, value);
|
|
strvec_push(&cmd->args, repo_path);
|
|
} else {
|
|
cmd->git_cmd = 1;
|
|
|
|
strvec_pushf(&cmd->args, "--git-dir=%s", repo_path);
|
|
strvec_push(&cmd->args, "for-each-ref");
|
|
strvec_push(&cmd->args, "--format=%(objectname)");
|
|
|
|
if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
|
|
strvec_push(&cmd->args, "--");
|
|
strvec_split(&cmd->args, value);
|
|
}
|
|
}
|
|
|
|
strvec_pushv(&cmd->env, (const char **)local_repo_env);
|
|
cmd->out = -1;
|
|
}
|
|
|
|
static void read_alternate_refs(const char *path,
|
|
alternate_ref_fn *cb,
|
|
void *data)
|
|
{
|
|
struct child_process cmd = CHILD_PROCESS_INIT;
|
|
struct strbuf line = STRBUF_INIT;
|
|
FILE *fh;
|
|
|
|
fill_alternate_refs_command(&cmd, path);
|
|
|
|
if (start_command(&cmd))
|
|
return;
|
|
|
|
fh = xfdopen(cmd.out, "r");
|
|
while (strbuf_getline_lf(&line, fh) != EOF) {
|
|
struct object_id oid;
|
|
const char *p;
|
|
|
|
if (parse_oid_hex(line.buf, &oid, &p) || *p) {
|
|
warning(_("invalid line while parsing alternate refs: %s"),
|
|
line.buf);
|
|
break;
|
|
}
|
|
|
|
cb(&oid, data);
|
|
}
|
|
|
|
fclose(fh);
|
|
finish_command(&cmd);
|
|
strbuf_release(&line);
|
|
}
|
|
|
|
struct alternate_refs_data {
|
|
alternate_ref_fn *fn;
|
|
void *data;
|
|
};
|
|
|
|
static int refs_from_alternate_cb(struct object_directory *e,
|
|
void *data)
|
|
{
|
|
struct strbuf path = STRBUF_INIT;
|
|
size_t base_len;
|
|
struct alternate_refs_data *cb = data;
|
|
|
|
if (!strbuf_realpath(&path, e->path, 0))
|
|
goto out;
|
|
if (!strbuf_strip_suffix(&path, "/objects"))
|
|
goto out;
|
|
base_len = path.len;
|
|
|
|
/* Is this a git repository with refs? */
|
|
strbuf_addstr(&path, "/refs");
|
|
if (!is_directory(path.buf))
|
|
goto out;
|
|
strbuf_setlen(&path, base_len);
|
|
|
|
read_alternate_refs(path.buf, cb->fn, cb->data);
|
|
|
|
out:
|
|
strbuf_release(&path);
|
|
return 0;
|
|
}
|
|
|
|
void for_each_alternate_ref(alternate_ref_fn fn, void *data)
|
|
{
|
|
struct alternate_refs_data cb;
|
|
cb.fn = fn;
|
|
cb.data = data;
|
|
foreach_alt_odb(refs_from_alternate_cb, &cb);
|
|
}
|
|
|
|
int foreach_alt_odb(alt_odb_fn fn, void *cb)
|
|
{
|
|
struct object_directory *ent;
|
|
int r = 0;
|
|
|
|
prepare_alt_odb(the_repository);
|
|
for (ent = the_repository->objects->odb->next; ent; ent = ent->next) {
|
|
r = fn(ent, cb);
|
|
if (r)
|
|
break;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
void prepare_alt_odb(struct repository *r)
|
|
{
|
|
if (r->objects->loaded_alternates)
|
|
return;
|
|
|
|
link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0);
|
|
|
|
read_info_alternates(r, r->objects->odb->path, 0);
|
|
r->objects->loaded_alternates = 1;
|
|
}
|
|
|
|
int has_alt_odb(struct repository *r)
|
|
{
|
|
prepare_alt_odb(r);
|
|
return !!r->objects->odb->next;
|
|
}
|
|
|
|
/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
|
|
static int freshen_file(const char *fn)
|
|
{
|
|
return !utime(fn, NULL);
|
|
}
|
|
|
|
/*
|
|
* All of the check_and_freshen functions return 1 if the file exists and was
|
|
* freshened (if freshening was requested), 0 otherwise. If they return
|
|
* 0, you should not assume that it is safe to skip a write of the object (it
|
|
* either does not exist on disk, or has a stale mtime and may be subject to
|
|
* pruning).
|
|
*/
|
|
int check_and_freshen_file(const char *fn, int freshen)
|
|
{
|
|
if (access(fn, F_OK))
|
|
return 0;
|
|
if (freshen && !freshen_file(fn))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int check_and_freshen_odb(struct object_directory *odb,
|
|
const struct object_id *oid,
|
|
int freshen)
|
|
{
|
|
static struct strbuf path = STRBUF_INIT;
|
|
odb_loose_path(odb, &path, oid);
|
|
return check_and_freshen_file(path.buf, freshen);
|
|
}
|
|
|
|
static int check_and_freshen_local(const struct object_id *oid, int freshen)
|
|
{
|
|
return check_and_freshen_odb(the_repository->objects->odb, oid, freshen);
|
|
}
|
|
|
|
static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen)
|
|
{
|
|
struct object_directory *odb;
|
|
|
|
prepare_alt_odb(the_repository);
|
|
for (odb = the_repository->objects->odb->next; odb; odb = odb->next) {
|
|
if (check_and_freshen_odb(odb, oid, freshen))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_and_freshen(const struct object_id *oid, int freshen)
|
|
{
|
|
return check_and_freshen_local(oid, freshen) ||
|
|
check_and_freshen_nonlocal(oid, freshen);
|
|
}
|
|
|
|
int has_loose_object_nonlocal(const struct object_id *oid)
|
|
{
|
|
return check_and_freshen_nonlocal(oid, 0);
|
|
}
|
|
|
|
int has_loose_object(const struct object_id *oid)
|
|
{
|
|
return check_and_freshen(oid, 0);
|
|
}
|
|
|
|
static void mmap_limit_check(size_t length)
|
|
{
|
|
static size_t limit = 0;
|
|
if (!limit) {
|
|
limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
|
|
if (!limit)
|
|
limit = SIZE_MAX;
|
|
}
|
|
if (length > limit)
|
|
die(_("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX),
|
|
(uintmax_t)length, (uintmax_t)limit);
|
|
}
|
|
|
|
void *xmmap_gently(void *start, size_t length,
|
|
int prot, int flags, int fd, off_t offset)
|
|
{
|
|
void *ret;
|
|
|
|
mmap_limit_check(length);
|
|
ret = mmap(start, length, prot, flags, fd, offset);
|
|
if (ret == MAP_FAILED && !length)
|
|
ret = NULL;
|
|
return ret;
|
|
}
|
|
|
|
const char *mmap_os_err(void)
|
|
{
|
|
static const char blank[] = "";
|
|
#if defined(__linux__)
|
|
if (errno == ENOMEM) {
|
|
/* this continues an existing error message: */
|
|
static const char enomem[] =
|
|
", check sys.vm.max_map_count and/or RLIMIT_DATA";
|
|
return enomem;
|
|
}
|
|
#endif /* OS-specific bits */
|
|
return blank;
|
|
}
|
|
|
|
void *xmmap(void *start, size_t length,
|
|
int prot, int flags, int fd, off_t offset)
|
|
{
|
|
void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
|
|
if (ret == MAP_FAILED)
|
|
die_errno(_("mmap failed%s"), mmap_os_err());
|
|
return ret;
|
|
}
|
|
|
|
static int format_object_header_literally(char *str, size_t size,
|
|
const char *type, size_t objsize)
|
|
{
|
|
return xsnprintf(str, size, "%s %"PRIuMAX, type, (uintmax_t)objsize) + 1;
|
|
}
|
|
|
|
int format_object_header(char *str, size_t size, enum object_type type,
|
|
size_t objsize)
|
|
{
|
|
const char *name = type_name(type);
|
|
|
|
if (!name)
|
|
BUG("could not get a type name for 'enum object_type' value %d", type);
|
|
|
|
return format_object_header_literally(str, size, name, objsize);
|
|
}
|
|
|
|
int check_object_signature(struct repository *r, const struct object_id *oid,
|
|
void *buf, unsigned long size,
|
|
enum object_type type)
|
|
{
|
|
struct object_id real_oid;
|
|
|
|
hash_object_file(r->hash_algo, buf, size, type, &real_oid);
|
|
|
|
return !oideq(oid, &real_oid) ? -1 : 0;
|
|
}
|
|
|
|
int stream_object_signature(struct repository *r, const struct object_id *oid)
|
|
{
|
|
struct object_id real_oid;
|
|
unsigned long size;
|
|
enum object_type obj_type;
|
|
struct git_istream *st;
|
|
git_hash_ctx c;
|
|
char hdr[MAX_HEADER_LEN];
|
|
int hdrlen;
|
|
|
|
st = open_istream(r, oid, &obj_type, &size, NULL);
|
|
if (!st)
|
|
return -1;
|
|
|
|
/* Generate the header */
|
|
hdrlen = format_object_header(hdr, sizeof(hdr), obj_type, size);
|
|
|
|
/* Sha1.. */
|
|
r->hash_algo->init_fn(&c);
|
|
r->hash_algo->update_fn(&c, hdr, hdrlen);
|
|
for (;;) {
|
|
char buf[1024 * 16];
|
|
ssize_t readlen = read_istream(st, buf, sizeof(buf));
|
|
|
|
if (readlen < 0) {
|
|
close_istream(st);
|
|
return -1;
|
|
}
|
|
if (!readlen)
|
|
break;
|
|
r->hash_algo->update_fn(&c, buf, readlen);
|
|
}
|
|
r->hash_algo->final_oid_fn(&real_oid, &c);
|
|
close_istream(st);
|
|
return !oideq(oid, &real_oid) ? -1 : 0;
|
|
}
|
|
|
|
int git_open_cloexec(const char *name, int flags)
|
|
{
|
|
int fd;
|
|
static int o_cloexec = O_CLOEXEC;
|
|
|
|
fd = open(name, flags | o_cloexec);
|
|
if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
|
|
/* Try again w/o O_CLOEXEC: the kernel might not support it */
|
|
o_cloexec &= ~O_CLOEXEC;
|
|
fd = open(name, flags | o_cloexec);
|
|
}
|
|
|
|
#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
|
|
{
|
|
static int fd_cloexec = FD_CLOEXEC;
|
|
|
|
if (!o_cloexec && 0 <= fd && fd_cloexec) {
|
|
/* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
|
|
int flags = fcntl(fd, F_GETFD);
|
|
if (fcntl(fd, F_SETFD, flags | fd_cloexec))
|
|
fd_cloexec = 0;
|
|
}
|
|
}
|
|
#endif
|
|
return fd;
|
|
}
|
|
|
|
/*
|
|
* Find "oid" as a loose object in the local repository or in an alternate.
|
|
* Returns 0 on success, negative on failure.
|
|
*
|
|
* The "path" out-parameter will give the path of the object we found (if any).
|
|
* Note that it may point to static storage and is only valid until another
|
|
* call to stat_loose_object().
|
|
*/
|
|
static int stat_loose_object(struct repository *r, const struct object_id *oid,
|
|
struct stat *st, const char **path)
|
|
{
|
|
struct object_directory *odb;
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
prepare_alt_odb(r);
|
|
for (odb = r->objects->odb; odb; odb = odb->next) {
|
|
*path = odb_loose_path(odb, &buf, oid);
|
|
if (!lstat(*path, st))
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Like stat_loose_object(), but actually open the object and return the
|
|
* descriptor. See the caveats on the "path" parameter above.
|
|
*/
|
|
static int open_loose_object(struct repository *r,
|
|
const struct object_id *oid, const char **path)
|
|
{
|
|
int fd;
|
|
struct object_directory *odb;
|
|
int most_interesting_errno = ENOENT;
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
prepare_alt_odb(r);
|
|
for (odb = r->objects->odb; odb; odb = odb->next) {
|
|
*path = odb_loose_path(odb, &buf, oid);
|
|
fd = git_open(*path);
|
|
if (fd >= 0)
|
|
return fd;
|
|
|
|
if (most_interesting_errno == ENOENT)
|
|
most_interesting_errno = errno;
|
|
}
|
|
errno = most_interesting_errno;
|
|
return -1;
|
|
}
|
|
|
|
static int quick_has_loose(struct repository *r,
|
|
const struct object_id *oid)
|
|
{
|
|
struct object_directory *odb;
|
|
|
|
prepare_alt_odb(r);
|
|
for (odb = r->objects->odb; odb; odb = odb->next) {
|
|
if (oidtree_contains(odb_loose_cache(odb, oid), oid))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Map and close the given loose object fd. The path argument is used for
|
|
* error reporting.
|
|
*/
|
|
static void *map_fd(int fd, const char *path, unsigned long *size)
|
|
{
|
|
void *map = NULL;
|
|
struct stat st;
|
|
|
|
if (!fstat(fd, &st)) {
|
|
*size = xsize_t(st.st_size);
|
|
if (!*size) {
|
|
/* mmap() is forbidden on empty files */
|
|
error(_("object file %s is empty"), path);
|
|
close(fd);
|
|
return NULL;
|
|
}
|
|
map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
}
|
|
close(fd);
|
|
return map;
|
|
}
|
|
|
|
void *map_loose_object(struct repository *r,
|
|
const struct object_id *oid,
|
|
unsigned long *size)
|
|
{
|
|
const char *p;
|
|
int fd = open_loose_object(r, oid, &p);
|
|
|
|
if (fd < 0)
|
|
return NULL;
|
|
return map_fd(fd, p, size);
|
|
}
|
|
|
|
enum unpack_loose_header_result unpack_loose_header(git_zstream *stream,
|
|
unsigned char *map,
|
|
unsigned long mapsize,
|
|
void *buffer,
|
|
unsigned long bufsiz,
|
|
struct strbuf *header)
|
|
{
|
|
int status;
|
|
|
|
/* Get the data stream */
|
|
memset(stream, 0, sizeof(*stream));
|
|
stream->next_in = map;
|
|
stream->avail_in = mapsize;
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
|
|
git_inflate_init(stream);
|
|
obj_read_unlock();
|
|
status = git_inflate(stream, 0);
|
|
obj_read_lock();
|
|
if (status < Z_OK)
|
|
return ULHR_BAD;
|
|
|
|
/*
|
|
* Check if entire header is unpacked in the first iteration.
|
|
*/
|
|
if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
|
|
return ULHR_OK;
|
|
|
|
/*
|
|
* We have a header longer than MAX_HEADER_LEN. The "header"
|
|
* here is only non-NULL when we run "cat-file
|
|
* --allow-unknown-type".
|
|
*/
|
|
if (!header)
|
|
return ULHR_TOO_LONG;
|
|
|
|
/*
|
|
* buffer[0..bufsiz] was not large enough. Copy the partial
|
|
* result out to header, and then append the result of further
|
|
* reading the stream.
|
|
*/
|
|
strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
|
|
do {
|
|
obj_read_unlock();
|
|
status = git_inflate(stream, 0);
|
|
obj_read_lock();
|
|
strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
|
|
if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
|
|
return 0;
|
|
stream->next_out = buffer;
|
|
stream->avail_out = bufsiz;
|
|
} while (status != Z_STREAM_END);
|
|
return ULHR_TOO_LONG;
|
|
}
|
|
|
|
static void *unpack_loose_rest(git_zstream *stream,
|
|
void *buffer, unsigned long size,
|
|
const struct object_id *oid)
|
|
{
|
|
int bytes = strlen(buffer) + 1;
|
|
unsigned char *buf = xmallocz(size);
|
|
unsigned long n;
|
|
int status = Z_OK;
|
|
|
|
n = stream->total_out - bytes;
|
|
if (n > size)
|
|
n = size;
|
|
memcpy(buf, (char *) buffer + bytes, n);
|
|
bytes = n;
|
|
if (bytes <= size) {
|
|
/*
|
|
* The above condition must be (bytes <= size), not
|
|
* (bytes < size). In other words, even though we
|
|
* expect no more output and set avail_out to zero,
|
|
* the input zlib stream may have bytes that express
|
|
* "this concludes the stream", and we *do* want to
|
|
* eat that input.
|
|
*
|
|
* Otherwise we would not be able to test that we
|
|
* consumed all the input to reach the expected size;
|
|
* we also want to check that zlib tells us that all
|
|
* went well with status == Z_STREAM_END at the end.
|
|
*/
|
|
stream->next_out = buf + bytes;
|
|
stream->avail_out = size - bytes;
|
|
while (status == Z_OK) {
|
|
obj_read_unlock();
|
|
status = git_inflate(stream, Z_FINISH);
|
|
obj_read_lock();
|
|
}
|
|
}
|
|
if (status == Z_STREAM_END && !stream->avail_in) {
|
|
git_inflate_end(stream);
|
|
return buf;
|
|
}
|
|
|
|
if (status < 0)
|
|
error(_("corrupt loose object '%s'"), oid_to_hex(oid));
|
|
else if (stream->avail_in)
|
|
error(_("garbage at end of loose object '%s'"),
|
|
oid_to_hex(oid));
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* We used to just use "sscanf()", but that's actually way
|
|
* too permissive for what we want to check. So do an anal
|
|
* object header parse by hand.
|
|
*/
|
|
int parse_loose_header(const char *hdr, struct object_info *oi)
|
|
{
|
|
const char *type_buf = hdr;
|
|
size_t size;
|
|
int type, type_len = 0;
|
|
|
|
/*
|
|
* The type can be of any size but is followed by
|
|
* a space.
|
|
*/
|
|
for (;;) {
|
|
char c = *hdr++;
|
|
if (!c)
|
|
return -1;
|
|
if (c == ' ')
|
|
break;
|
|
type_len++;
|
|
}
|
|
|
|
type = type_from_string_gently(type_buf, type_len, 1);
|
|
if (oi->type_name)
|
|
strbuf_add(oi->type_name, type_buf, type_len);
|
|
if (oi->typep)
|
|
*oi->typep = type;
|
|
|
|
/*
|
|
* The length must follow immediately, and be in canonical
|
|
* decimal format (ie "010" is not valid).
|
|
*/
|
|
size = *hdr++ - '0';
|
|
if (size > 9)
|
|
return -1;
|
|
if (size) {
|
|
for (;;) {
|
|
unsigned long c = *hdr - '0';
|
|
if (c > 9)
|
|
break;
|
|
hdr++;
|
|
size = st_add(st_mult(size, 10), c);
|
|
}
|
|
}
|
|
|
|
if (oi->sizep)
|
|
*oi->sizep = cast_size_t_to_ulong(size);
|
|
|
|
/*
|
|
* The length must be followed by a zero byte
|
|
*/
|
|
if (*hdr)
|
|
return -1;
|
|
|
|
/*
|
|
* The format is valid, but the type may still be bogus. The
|
|
* Caller needs to check its oi->typep.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static int loose_object_info(struct repository *r,
|
|
const struct object_id *oid,
|
|
struct object_info *oi, int flags)
|
|
{
|
|
int status = 0;
|
|
int fd;
|
|
unsigned long mapsize;
|
|
const char *path;
|
|
void *map;
|
|
git_zstream stream;
|
|
char hdr[MAX_HEADER_LEN];
|
|
struct strbuf hdrbuf = STRBUF_INIT;
|
|
unsigned long size_scratch;
|
|
enum object_type type_scratch;
|
|
int allow_unknown = flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE;
|
|
|
|
if (oi->delta_base_oid)
|
|
oidclr(oi->delta_base_oid);
|
|
|
|
/*
|
|
* If we don't care about type or size, then we don't
|
|
* need to look inside the object at all. Note that we
|
|
* do not optimize out the stat call, even if the
|
|
* caller doesn't care about the disk-size, since our
|
|
* return value implicitly indicates whether the
|
|
* object even exists.
|
|
*/
|
|
if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
|
|
struct stat st;
|
|
if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
|
|
return quick_has_loose(r, oid) ? 0 : -1;
|
|
if (stat_loose_object(r, oid, &st, &path) < 0)
|
|
return -1;
|
|
if (oi->disk_sizep)
|
|
*oi->disk_sizep = st.st_size;
|
|
return 0;
|
|
}
|
|
|
|
fd = open_loose_object(r, oid, &path);
|
|
if (fd < 0) {
|
|
if (errno != ENOENT)
|
|
error_errno(_("unable to open loose object %s"), oid_to_hex(oid));
|
|
return -1;
|
|
}
|
|
map = map_fd(fd, path, &mapsize);
|
|
if (!map)
|
|
return -1;
|
|
|
|
if (!oi->sizep)
|
|
oi->sizep = &size_scratch;
|
|
if (!oi->typep)
|
|
oi->typep = &type_scratch;
|
|
|
|
if (oi->disk_sizep)
|
|
*oi->disk_sizep = mapsize;
|
|
|
|
switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
|
|
allow_unknown ? &hdrbuf : NULL)) {
|
|
case ULHR_OK:
|
|
if (parse_loose_header(hdrbuf.len ? hdrbuf.buf : hdr, oi) < 0)
|
|
status = error(_("unable to parse %s header"), oid_to_hex(oid));
|
|
else if (!allow_unknown && *oi->typep < 0)
|
|
die(_("invalid object type"));
|
|
|
|
if (!oi->contentp)
|
|
break;
|
|
*oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid);
|
|
if (*oi->contentp)
|
|
goto cleanup;
|
|
|
|
status = -1;
|
|
break;
|
|
case ULHR_BAD:
|
|
status = error(_("unable to unpack %s header"),
|
|
oid_to_hex(oid));
|
|
break;
|
|
case ULHR_TOO_LONG:
|
|
status = error(_("header for %s too long, exceeds %d bytes"),
|
|
oid_to_hex(oid), MAX_HEADER_LEN);
|
|
break;
|
|
}
|
|
|
|
if (status && (flags & OBJECT_INFO_DIE_IF_CORRUPT))
|
|
die(_("loose object %s (stored in %s) is corrupt"),
|
|
oid_to_hex(oid), path);
|
|
|
|
git_inflate_end(&stream);
|
|
cleanup:
|
|
munmap(map, mapsize);
|
|
if (oi->sizep == &size_scratch)
|
|
oi->sizep = NULL;
|
|
strbuf_release(&hdrbuf);
|
|
if (oi->typep == &type_scratch)
|
|
oi->typep = NULL;
|
|
oi->whence = OI_LOOSE;
|
|
return status;
|
|
}
|
|
|
|
int obj_read_use_lock = 0;
|
|
pthread_mutex_t obj_read_mutex;
|
|
|
|
void enable_obj_read_lock(void)
|
|
{
|
|
if (obj_read_use_lock)
|
|
return;
|
|
|
|
obj_read_use_lock = 1;
|
|
init_recursive_mutex(&obj_read_mutex);
|
|
}
|
|
|
|
void disable_obj_read_lock(void)
|
|
{
|
|
if (!obj_read_use_lock)
|
|
return;
|
|
|
|
obj_read_use_lock = 0;
|
|
pthread_mutex_destroy(&obj_read_mutex);
|
|
}
|
|
|
|
int fetch_if_missing = 1;
|
|
|
|
static int do_oid_object_info_extended(struct repository *r,
|
|
const struct object_id *oid,
|
|
struct object_info *oi, unsigned flags)
|
|
{
|
|
static struct object_info blank_oi = OBJECT_INFO_INIT;
|
|
struct cached_object *co;
|
|
struct pack_entry e;
|
|
int rtype;
|
|
const struct object_id *real = oid;
|
|
int already_retried = 0;
|
|
|
|
|
|
if (flags & OBJECT_INFO_LOOKUP_REPLACE)
|
|
real = lookup_replace_object(r, oid);
|
|
|
|
if (is_null_oid(real))
|
|
return -1;
|
|
|
|
if (!oi)
|
|
oi = &blank_oi;
|
|
|
|
co = find_cached_object(real);
|
|
if (co) {
|
|
if (oi->typep)
|
|
*(oi->typep) = co->type;
|
|
if (oi->sizep)
|
|
*(oi->sizep) = co->size;
|
|
if (oi->disk_sizep)
|
|
*(oi->disk_sizep) = 0;
|
|
if (oi->delta_base_oid)
|
|
oidclr(oi->delta_base_oid);
|
|
if (oi->type_name)
|
|
strbuf_addstr(oi->type_name, type_name(co->type));
|
|
if (oi->contentp)
|
|
*oi->contentp = xmemdupz(co->buf, co->size);
|
|
oi->whence = OI_CACHED;
|
|
return 0;
|
|
}
|
|
|
|
while (1) {
|
|
if (find_pack_entry(r, real, &e))
|
|
break;
|
|
|
|
/* Most likely it's a loose object. */
|
|
if (!loose_object_info(r, real, oi, flags))
|
|
return 0;
|
|
|
|
/* Not a loose object; someone else may have just packed it. */
|
|
if (!(flags & OBJECT_INFO_QUICK)) {
|
|
reprepare_packed_git(r);
|
|
if (find_pack_entry(r, real, &e))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If r is the_repository, this might be an attempt at
|
|
* accessing a submodule object as if it were in the_repository
|
|
* (having called add_submodule_odb() on that submodule's ODB).
|
|
* If any such ODBs exist, register them and try again.
|
|
*/
|
|
if (r == the_repository &&
|
|
register_all_submodule_odb_as_alternates())
|
|
/* We added some alternates; retry */
|
|
continue;
|
|
|
|
/* Check if it is a missing object */
|
|
if (fetch_if_missing && repo_has_promisor_remote(r) &&
|
|
!already_retried &&
|
|
!(flags & OBJECT_INFO_SKIP_FETCH_OBJECT)) {
|
|
promisor_remote_get_direct(r, real, 1);
|
|
already_retried = 1;
|
|
continue;
|
|
}
|
|
|
|
if (flags & OBJECT_INFO_DIE_IF_CORRUPT) {
|
|
const struct packed_git *p;
|
|
if ((flags & OBJECT_INFO_LOOKUP_REPLACE) && !oideq(real, oid))
|
|
die(_("replacement %s not found for %s"),
|
|
oid_to_hex(real), oid_to_hex(oid));
|
|
if ((p = has_packed_and_bad(r, real)))
|
|
die(_("packed object %s (stored in %s) is corrupt"),
|
|
oid_to_hex(real), p->pack_name);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (oi == &blank_oi)
|
|
/*
|
|
* We know that the caller doesn't actually need the
|
|
* information below, so return early.
|
|
*/
|
|
return 0;
|
|
rtype = packed_object_info(r, e.p, e.offset, oi);
|
|
if (rtype < 0) {
|
|
mark_bad_packed_object(e.p, real);
|
|
return do_oid_object_info_extended(r, real, oi, 0);
|
|
} else if (oi->whence == OI_PACKED) {
|
|
oi->u.packed.offset = e.offset;
|
|
oi->u.packed.pack = e.p;
|
|
oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
|
|
rtype == OBJ_OFS_DELTA);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int oid_object_info_extended(struct repository *r, const struct object_id *oid,
|
|
struct object_info *oi, unsigned flags)
|
|
{
|
|
int ret;
|
|
obj_read_lock();
|
|
ret = do_oid_object_info_extended(r, oid, oi, flags);
|
|
obj_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* returns enum object_type or negative */
|
|
int oid_object_info(struct repository *r,
|
|
const struct object_id *oid,
|
|
unsigned long *sizep)
|
|
{
|
|
enum object_type type;
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
|
|
oi.typep = &type;
|
|
oi.sizep = sizep;
|
|
if (oid_object_info_extended(r, oid, &oi,
|
|
OBJECT_INFO_LOOKUP_REPLACE) < 0)
|
|
return -1;
|
|
return type;
|
|
}
|
|
|
|
int pretend_object_file(void *buf, unsigned long len, enum object_type type,
|
|
struct object_id *oid)
|
|
{
|
|
struct cached_object *co;
|
|
|
|
hash_object_file(the_hash_algo, buf, len, type, oid);
|
|
if (repo_has_object_file_with_flags(the_repository, oid, OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT) ||
|
|
find_cached_object(oid))
|
|
return 0;
|
|
ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
|
|
co = &cached_objects[cached_object_nr++];
|
|
co->size = len;
|
|
co->type = type;
|
|
co->buf = xmalloc(len);
|
|
memcpy(co->buf, buf, len);
|
|
oidcpy(&co->oid, oid);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function dies on corrupt objects; the callers who want to
|
|
* deal with them should arrange to call oid_object_info_extended() and give
|
|
* error messages themselves.
|
|
*/
|
|
void *repo_read_object_file(struct repository *r,
|
|
const struct object_id *oid,
|
|
enum object_type *type,
|
|
unsigned long *size)
|
|
{
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
unsigned flags = OBJECT_INFO_DIE_IF_CORRUPT | OBJECT_INFO_LOOKUP_REPLACE;
|
|
void *data;
|
|
|
|
oi.typep = type;
|
|
oi.sizep = size;
|
|
oi.contentp = &data;
|
|
if (oid_object_info_extended(r, oid, &oi, flags))
|
|
return NULL;
|
|
|
|
return data;
|
|
}
|
|
|
|
void *read_object_with_reference(struct repository *r,
|
|
const struct object_id *oid,
|
|
enum object_type required_type,
|
|
unsigned long *size,
|
|
struct object_id *actual_oid_return)
|
|
{
|
|
enum object_type type;
|
|
void *buffer;
|
|
unsigned long isize;
|
|
struct object_id actual_oid;
|
|
|
|
oidcpy(&actual_oid, oid);
|
|
while (1) {
|
|
int ref_length = -1;
|
|
const char *ref_type = NULL;
|
|
|
|
buffer = repo_read_object_file(r, &actual_oid, &type, &isize);
|
|
if (!buffer)
|
|
return NULL;
|
|
if (type == required_type) {
|
|
*size = isize;
|
|
if (actual_oid_return)
|
|
oidcpy(actual_oid_return, &actual_oid);
|
|
return buffer;
|
|
}
|
|
/* Handle references */
|
|
else if (type == OBJ_COMMIT)
|
|
ref_type = "tree ";
|
|
else if (type == OBJ_TAG)
|
|
ref_type = "object ";
|
|
else {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
ref_length = strlen(ref_type);
|
|
|
|
if (ref_length + the_hash_algo->hexsz > isize ||
|
|
memcmp(buffer, ref_type, ref_length) ||
|
|
get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
free(buffer);
|
|
/* Now we have the ID of the referred-to object in
|
|
* actual_oid. Check again. */
|
|
}
|
|
}
|
|
|
|
static void hash_object_body(const struct git_hash_algo *algo, git_hash_ctx *c,
|
|
const void *buf, unsigned long len,
|
|
struct object_id *oid,
|
|
char *hdr, int *hdrlen)
|
|
{
|
|
algo->init_fn(c);
|
|
algo->update_fn(c, hdr, *hdrlen);
|
|
algo->update_fn(c, buf, len);
|
|
algo->final_oid_fn(oid, c);
|
|
}
|
|
|
|
static void write_object_file_prepare(const struct git_hash_algo *algo,
|
|
const void *buf, unsigned long len,
|
|
enum object_type type, struct object_id *oid,
|
|
char *hdr, int *hdrlen)
|
|
{
|
|
git_hash_ctx c;
|
|
|
|
/* Generate the header */
|
|
*hdrlen = format_object_header(hdr, *hdrlen, type, len);
|
|
|
|
/* Sha1.. */
|
|
hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen);
|
|
}
|
|
|
|
static void write_object_file_prepare_literally(const struct git_hash_algo *algo,
|
|
const void *buf, unsigned long len,
|
|
const char *type, struct object_id *oid,
|
|
char *hdr, int *hdrlen)
|
|
{
|
|
git_hash_ctx c;
|
|
|
|
*hdrlen = format_object_header_literally(hdr, *hdrlen, type, len);
|
|
hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen);
|
|
}
|
|
|
|
/*
|
|
* Move the just written object into its final resting place.
|
|
*/
|
|
int finalize_object_file(const char *tmpfile, const char *filename)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
|
|
goto try_rename;
|
|
else if (link(tmpfile, filename))
|
|
ret = errno;
|
|
|
|
/*
|
|
* Coda hack - coda doesn't like cross-directory links,
|
|
* so we fall back to a rename, which will mean that it
|
|
* won't be able to check collisions, but that's not a
|
|
* big deal.
|
|
*
|
|
* The same holds for FAT formatted media.
|
|
*
|
|
* When this succeeds, we just return. We have nothing
|
|
* left to unlink.
|
|
*/
|
|
if (ret && ret != EEXIST) {
|
|
try_rename:
|
|
if (!rename(tmpfile, filename))
|
|
goto out;
|
|
ret = errno;
|
|
}
|
|
unlink_or_warn(tmpfile);
|
|
if (ret) {
|
|
if (ret != EEXIST) {
|
|
return error_errno(_("unable to write file %s"), filename);
|
|
}
|
|
/* FIXME!!! Collision check here ? */
|
|
}
|
|
|
|
out:
|
|
if (adjust_shared_perm(filename))
|
|
return error(_("unable to set permission to '%s'"), filename);
|
|
return 0;
|
|
}
|
|
|
|
static void hash_object_file_literally(const struct git_hash_algo *algo,
|
|
const void *buf, unsigned long len,
|
|
const char *type, struct object_id *oid)
|
|
{
|
|
char hdr[MAX_HEADER_LEN];
|
|
int hdrlen = sizeof(hdr);
|
|
|
|
write_object_file_prepare_literally(algo, buf, len, type, oid, hdr, &hdrlen);
|
|
}
|
|
|
|
void hash_object_file(const struct git_hash_algo *algo, const void *buf,
|
|
unsigned long len, enum object_type type,
|
|
struct object_id *oid)
|
|
{
|
|
hash_object_file_literally(algo, buf, len, type_name(type), oid);
|
|
}
|
|
|
|
/* Finalize a file on disk, and close it. */
|
|
static void close_loose_object(int fd, const char *filename)
|
|
{
|
|
if (the_repository->objects->odb->will_destroy)
|
|
goto out;
|
|
|
|
if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
|
|
fsync_loose_object_bulk_checkin(fd, filename);
|
|
else if (fsync_object_files > 0)
|
|
fsync_or_die(fd, filename);
|
|
else
|
|
fsync_component_or_die(FSYNC_COMPONENT_LOOSE_OBJECT, fd,
|
|
filename);
|
|
|
|
out:
|
|
if (close(fd) != 0)
|
|
die_errno(_("error when closing loose object file"));
|
|
}
|
|
|
|
/* Size of directory component, including the ending '/' */
|
|
static inline int directory_size(const char *filename)
|
|
{
|
|
const char *s = strrchr(filename, '/');
|
|
if (!s)
|
|
return 0;
|
|
return s - filename + 1;
|
|
}
|
|
|
|
/*
|
|
* This creates a temporary file in the same directory as the final
|
|
* 'filename'
|
|
*
|
|
* We want to avoid cross-directory filename renames, because those
|
|
* can have problems on various filesystems (FAT, NFS, Coda).
|
|
*/
|
|
static int create_tmpfile(struct strbuf *tmp, const char *filename)
|
|
{
|
|
int fd, dirlen = directory_size(filename);
|
|
|
|
strbuf_reset(tmp);
|
|
strbuf_add(tmp, filename, dirlen);
|
|
strbuf_addstr(tmp, "tmp_obj_XXXXXX");
|
|
fd = git_mkstemp_mode(tmp->buf, 0444);
|
|
if (fd < 0 && dirlen && errno == ENOENT) {
|
|
/*
|
|
* Make sure the directory exists; note that the contents
|
|
* of the buffer are undefined after mkstemp returns an
|
|
* error, so we have to rewrite the whole buffer from
|
|
* scratch.
|
|
*/
|
|
strbuf_reset(tmp);
|
|
strbuf_add(tmp, filename, dirlen - 1);
|
|
if (mkdir(tmp->buf, 0777) && errno != EEXIST)
|
|
return -1;
|
|
if (adjust_shared_perm(tmp->buf))
|
|
return -1;
|
|
|
|
/* Try again */
|
|
strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
|
|
fd = git_mkstemp_mode(tmp->buf, 0444);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* Common steps for loose object writers to start writing loose
|
|
* objects:
|
|
*
|
|
* - Create tmpfile for the loose object.
|
|
* - Setup zlib stream for compression.
|
|
* - Start to feed header to zlib stream.
|
|
*
|
|
* Returns a "fd", which should later be provided to
|
|
* end_loose_object_common().
|
|
*/
|
|
static int start_loose_object_common(struct strbuf *tmp_file,
|
|
const char *filename, unsigned flags,
|
|
git_zstream *stream,
|
|
unsigned char *buf, size_t buflen,
|
|
git_hash_ctx *c,
|
|
char *hdr, int hdrlen)
|
|
{
|
|
int fd;
|
|
|
|
fd = create_tmpfile(tmp_file, filename);
|
|
if (fd < 0) {
|
|
if (flags & HASH_SILENT)
|
|
return -1;
|
|
else if (errno == EACCES)
|
|
return error(_("insufficient permission for adding "
|
|
"an object to repository database %s"),
|
|
get_object_directory());
|
|
else
|
|
return error_errno(
|
|
_("unable to create temporary file"));
|
|
}
|
|
|
|
/* Setup zlib stream for compression */
|
|
git_deflate_init(stream, zlib_compression_level);
|
|
stream->next_out = buf;
|
|
stream->avail_out = buflen;
|
|
the_hash_algo->init_fn(c);
|
|
|
|
/* Start to feed header to zlib stream */
|
|
stream->next_in = (unsigned char *)hdr;
|
|
stream->avail_in = hdrlen;
|
|
while (git_deflate(stream, 0) == Z_OK)
|
|
; /* nothing */
|
|
the_hash_algo->update_fn(c, hdr, hdrlen);
|
|
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* Common steps for the inner git_deflate() loop for writing loose
|
|
* objects. Returns what git_deflate() returns.
|
|
*/
|
|
static int write_loose_object_common(git_hash_ctx *c,
|
|
git_zstream *stream, const int flush,
|
|
unsigned char *in0, const int fd,
|
|
unsigned char *compressed,
|
|
const size_t compressed_len)
|
|
{
|
|
int ret;
|
|
|
|
ret = git_deflate(stream, flush ? Z_FINISH : 0);
|
|
the_hash_algo->update_fn(c, in0, stream->next_in - in0);
|
|
if (write_in_full(fd, compressed, stream->next_out - compressed) < 0)
|
|
die_errno(_("unable to write loose object file"));
|
|
stream->next_out = compressed;
|
|
stream->avail_out = compressed_len;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Common steps for loose object writers to end writing loose objects:
|
|
*
|
|
* - End the compression of zlib stream.
|
|
* - Get the calculated oid to "oid".
|
|
*/
|
|
static int end_loose_object_common(git_hash_ctx *c, git_zstream *stream,
|
|
struct object_id *oid)
|
|
{
|
|
int ret;
|
|
|
|
ret = git_deflate_end_gently(stream);
|
|
if (ret != Z_OK)
|
|
return ret;
|
|
the_hash_algo->final_oid_fn(oid, c);
|
|
|
|
return Z_OK;
|
|
}
|
|
|
|
static int write_loose_object(const struct object_id *oid, char *hdr,
|
|
int hdrlen, const void *buf, unsigned long len,
|
|
time_t mtime, unsigned flags)
|
|
{
|
|
int fd, ret;
|
|
unsigned char compressed[4096];
|
|
git_zstream stream;
|
|
git_hash_ctx c;
|
|
struct object_id parano_oid;
|
|
static struct strbuf tmp_file = STRBUF_INIT;
|
|
static struct strbuf filename = STRBUF_INIT;
|
|
|
|
if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
|
|
prepare_loose_object_bulk_checkin();
|
|
|
|
loose_object_path(the_repository, &filename, oid);
|
|
|
|
fd = start_loose_object_common(&tmp_file, filename.buf, flags,
|
|
&stream, compressed, sizeof(compressed),
|
|
&c, hdr, hdrlen);
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
/* Then the data itself.. */
|
|
stream.next_in = (void *)buf;
|
|
stream.avail_in = len;
|
|
do {
|
|
unsigned char *in0 = stream.next_in;
|
|
|
|
ret = write_loose_object_common(&c, &stream, 1, in0, fd,
|
|
compressed, sizeof(compressed));
|
|
} while (ret == Z_OK);
|
|
|
|
if (ret != Z_STREAM_END)
|
|
die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid),
|
|
ret);
|
|
ret = end_loose_object_common(&c, &stream, ¶no_oid);
|
|
if (ret != Z_OK)
|
|
die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid),
|
|
ret);
|
|
if (!oideq(oid, ¶no_oid))
|
|
die(_("confused by unstable object source data for %s"),
|
|
oid_to_hex(oid));
|
|
|
|
close_loose_object(fd, tmp_file.buf);
|
|
|
|
if (mtime) {
|
|
struct utimbuf utb;
|
|
utb.actime = mtime;
|
|
utb.modtime = mtime;
|
|
if (utime(tmp_file.buf, &utb) < 0 &&
|
|
!(flags & HASH_SILENT))
|
|
warning_errno(_("failed utime() on %s"), tmp_file.buf);
|
|
}
|
|
|
|
return finalize_object_file(tmp_file.buf, filename.buf);
|
|
}
|
|
|
|
static int freshen_loose_object(const struct object_id *oid)
|
|
{
|
|
return check_and_freshen(oid, 1);
|
|
}
|
|
|
|
static int freshen_packed_object(const struct object_id *oid)
|
|
{
|
|
struct pack_entry e;
|
|
if (!find_pack_entry(the_repository, oid, &e))
|
|
return 0;
|
|
if (e.p->is_cruft)
|
|
return 0;
|
|
if (e.p->freshened)
|
|
return 1;
|
|
if (!freshen_file(e.p->pack_name))
|
|
return 0;
|
|
e.p->freshened = 1;
|
|
return 1;
|
|
}
|
|
|
|
int stream_loose_object(struct input_stream *in_stream, size_t len,
|
|
struct object_id *oid)
|
|
{
|
|
int fd, ret, err = 0, flush = 0;
|
|
unsigned char compressed[4096];
|
|
git_zstream stream;
|
|
git_hash_ctx c;
|
|
struct strbuf tmp_file = STRBUF_INIT;
|
|
struct strbuf filename = STRBUF_INIT;
|
|
int dirlen;
|
|
char hdr[MAX_HEADER_LEN];
|
|
int hdrlen;
|
|
|
|
if (batch_fsync_enabled(FSYNC_COMPONENT_LOOSE_OBJECT))
|
|
prepare_loose_object_bulk_checkin();
|
|
|
|
/* Since oid is not determined, save tmp file to odb path. */
|
|
strbuf_addf(&filename, "%s/", get_object_directory());
|
|
hdrlen = format_object_header(hdr, sizeof(hdr), OBJ_BLOB, len);
|
|
|
|
/*
|
|
* Common steps for write_loose_object and stream_loose_object to
|
|
* start writing loose objects:
|
|
*
|
|
* - Create tmpfile for the loose object.
|
|
* - Setup zlib stream for compression.
|
|
* - Start to feed header to zlib stream.
|
|
*/
|
|
fd = start_loose_object_common(&tmp_file, filename.buf, 0,
|
|
&stream, compressed, sizeof(compressed),
|
|
&c, hdr, hdrlen);
|
|
if (fd < 0) {
|
|
err = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Then the data itself.. */
|
|
do {
|
|
unsigned char *in0 = stream.next_in;
|
|
|
|
if (!stream.avail_in && !in_stream->is_finished) {
|
|
const void *in = in_stream->read(in_stream, &stream.avail_in);
|
|
stream.next_in = (void *)in;
|
|
in0 = (unsigned char *)in;
|
|
/* All data has been read. */
|
|
if (in_stream->is_finished)
|
|
flush = 1;
|
|
}
|
|
ret = write_loose_object_common(&c, &stream, flush, in0, fd,
|
|
compressed, sizeof(compressed));
|
|
/*
|
|
* Unlike write_loose_object(), we do not have the entire
|
|
* buffer. If we get Z_BUF_ERROR due to too few input bytes,
|
|
* then we'll replenish them in the next input_stream->read()
|
|
* call when we loop.
|
|
*/
|
|
} while (ret == Z_OK || ret == Z_BUF_ERROR);
|
|
|
|
if (stream.total_in != len + hdrlen)
|
|
die(_("write stream object %ld != %"PRIuMAX), stream.total_in,
|
|
(uintmax_t)len + hdrlen);
|
|
|
|
/*
|
|
* Common steps for write_loose_object and stream_loose_object to
|
|
* end writing loose oject:
|
|
*
|
|
* - End the compression of zlib stream.
|
|
* - Get the calculated oid.
|
|
*/
|
|
if (ret != Z_STREAM_END)
|
|
die(_("unable to stream deflate new object (%d)"), ret);
|
|
ret = end_loose_object_common(&c, &stream, oid);
|
|
if (ret != Z_OK)
|
|
die(_("deflateEnd on stream object failed (%d)"), ret);
|
|
close_loose_object(fd, tmp_file.buf);
|
|
|
|
if (freshen_packed_object(oid) || freshen_loose_object(oid)) {
|
|
unlink_or_warn(tmp_file.buf);
|
|
goto cleanup;
|
|
}
|
|
|
|
loose_object_path(the_repository, &filename, oid);
|
|
|
|
/* We finally know the object path, and create the missing dir. */
|
|
dirlen = directory_size(filename.buf);
|
|
if (dirlen) {
|
|
struct strbuf dir = STRBUF_INIT;
|
|
strbuf_add(&dir, filename.buf, dirlen);
|
|
|
|
if (mkdir_in_gitdir(dir.buf) && errno != EEXIST) {
|
|
err = error_errno(_("unable to create directory %s"), dir.buf);
|
|
strbuf_release(&dir);
|
|
goto cleanup;
|
|
}
|
|
strbuf_release(&dir);
|
|
}
|
|
|
|
err = finalize_object_file(tmp_file.buf, filename.buf);
|
|
cleanup:
|
|
strbuf_release(&tmp_file);
|
|
strbuf_release(&filename);
|
|
return err;
|
|
}
|
|
|
|
int write_object_file_flags(const void *buf, unsigned long len,
|
|
enum object_type type, struct object_id *oid,
|
|
unsigned flags)
|
|
{
|
|
char hdr[MAX_HEADER_LEN];
|
|
int hdrlen = sizeof(hdr);
|
|
|
|
/* Normally if we have it in the pack then we do not bother writing
|
|
* it out into .git/objects/??/?{38} file.
|
|
*/
|
|
write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr,
|
|
&hdrlen);
|
|
if (freshen_packed_object(oid) || freshen_loose_object(oid))
|
|
return 0;
|
|
return write_loose_object(oid, hdr, hdrlen, buf, len, 0, flags);
|
|
}
|
|
|
|
int write_object_file_literally(const void *buf, unsigned long len,
|
|
const char *type, struct object_id *oid,
|
|
unsigned flags)
|
|
{
|
|
char *header;
|
|
int hdrlen, status = 0;
|
|
|
|
/* type string, SP, %lu of the length plus NUL must fit this */
|
|
hdrlen = strlen(type) + MAX_HEADER_LEN;
|
|
header = xmalloc(hdrlen);
|
|
write_object_file_prepare_literally(the_hash_algo, buf, len, type,
|
|
oid, header, &hdrlen);
|
|
|
|
if (!(flags & HASH_WRITE_OBJECT))
|
|
goto cleanup;
|
|
if (freshen_packed_object(oid) || freshen_loose_object(oid))
|
|
goto cleanup;
|
|
status = write_loose_object(oid, header, hdrlen, buf, len, 0, 0);
|
|
|
|
cleanup:
|
|
free(header);
|
|
return status;
|
|
}
|
|
|
|
int force_object_loose(const struct object_id *oid, time_t mtime)
|
|
{
|
|
void *buf;
|
|
unsigned long len;
|
|
struct object_info oi = OBJECT_INFO_INIT;
|
|
enum object_type type;
|
|
char hdr[MAX_HEADER_LEN];
|
|
int hdrlen;
|
|
int ret;
|
|
|
|
if (has_loose_object(oid))
|
|
return 0;
|
|
oi.typep = &type;
|
|
oi.sizep = &len;
|
|
oi.contentp = &buf;
|
|
if (oid_object_info_extended(the_repository, oid, &oi, 0))
|
|
return error(_("cannot read object for %s"), oid_to_hex(oid));
|
|
hdrlen = format_object_header(hdr, sizeof(hdr), type, len);
|
|
ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime, 0);
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int has_object(struct repository *r, const struct object_id *oid,
|
|
unsigned flags)
|
|
{
|
|
int quick = !(flags & HAS_OBJECT_RECHECK_PACKED);
|
|
unsigned object_info_flags = OBJECT_INFO_SKIP_FETCH_OBJECT |
|
|
(quick ? OBJECT_INFO_QUICK : 0);
|
|
|
|
if (!startup_info->have_repository)
|
|
return 0;
|
|
return oid_object_info_extended(r, oid, NULL, object_info_flags) >= 0;
|
|
}
|
|
|
|
int repo_has_object_file_with_flags(struct repository *r,
|
|
const struct object_id *oid, int flags)
|
|
{
|
|
if (!startup_info->have_repository)
|
|
return 0;
|
|
return oid_object_info_extended(r, oid, NULL, flags) >= 0;
|
|
}
|
|
|
|
int repo_has_object_file(struct repository *r,
|
|
const struct object_id *oid)
|
|
{
|
|
return repo_has_object_file_with_flags(r, oid, 0);
|
|
}
|
|
|
|
/*
|
|
* We can't use the normal fsck_error_function() for index_mem(),
|
|
* because we don't yet have a valid oid for it to report. Instead,
|
|
* report the minimal fsck error here, and rely on the caller to
|
|
* give more context.
|
|
*/
|
|
static int hash_format_check_report(struct fsck_options *opts UNUSED,
|
|
const struct object_id *oid UNUSED,
|
|
enum object_type object_type UNUSED,
|
|
enum fsck_msg_type msg_type UNUSED,
|
|
enum fsck_msg_id msg_id UNUSED,
|
|
const char *message)
|
|
{
|
|
error(_("object fails fsck: %s"), message);
|
|
return 1;
|
|
}
|
|
|
|
static int index_mem(struct index_state *istate,
|
|
struct object_id *oid, void *buf, size_t size,
|
|
enum object_type type,
|
|
const char *path, unsigned flags)
|
|
{
|
|
int ret = 0;
|
|
int re_allocated = 0;
|
|
int write_object = flags & HASH_WRITE_OBJECT;
|
|
|
|
if (!type)
|
|
type = OBJ_BLOB;
|
|
|
|
/*
|
|
* Convert blobs to git internal format
|
|
*/
|
|
if ((type == OBJ_BLOB) && path) {
|
|
struct strbuf nbuf = STRBUF_INIT;
|
|
if (convert_to_git(istate, path, buf, size, &nbuf,
|
|
get_conv_flags(flags))) {
|
|
buf = strbuf_detach(&nbuf, &size);
|
|
re_allocated = 1;
|
|
}
|
|
}
|
|
if (flags & HASH_FORMAT_CHECK) {
|
|
struct fsck_options opts = FSCK_OPTIONS_DEFAULT;
|
|
|
|
opts.strict = 1;
|
|
opts.error_func = hash_format_check_report;
|
|
if (fsck_buffer(null_oid(), type, buf, size, &opts))
|
|
die(_("refusing to create malformed object"));
|
|
fsck_finish(&opts);
|
|
}
|
|
|
|
if (write_object)
|
|
ret = write_object_file(buf, size, type, oid);
|
|
else
|
|
hash_object_file(the_hash_algo, buf, size, type, oid);
|
|
if (re_allocated)
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_stream_convert_blob(struct index_state *istate,
|
|
struct object_id *oid,
|
|
int fd,
|
|
const char *path,
|
|
unsigned flags)
|
|
{
|
|
int ret = 0;
|
|
const int write_object = flags & HASH_WRITE_OBJECT;
|
|
struct strbuf sbuf = STRBUF_INIT;
|
|
|
|
assert(path);
|
|
assert(would_convert_to_git_filter_fd(istate, path));
|
|
|
|
convert_to_git_filter_fd(istate, path, fd, &sbuf,
|
|
get_conv_flags(flags));
|
|
|
|
if (write_object)
|
|
ret = write_object_file(sbuf.buf, sbuf.len, OBJ_BLOB,
|
|
oid);
|
|
else
|
|
hash_object_file(the_hash_algo, sbuf.buf, sbuf.len, OBJ_BLOB,
|
|
oid);
|
|
strbuf_release(&sbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int index_pipe(struct index_state *istate, struct object_id *oid,
|
|
int fd, enum object_type type,
|
|
const char *path, unsigned flags)
|
|
{
|
|
struct strbuf sbuf = STRBUF_INIT;
|
|
int ret;
|
|
|
|
if (strbuf_read(&sbuf, fd, 4096) >= 0)
|
|
ret = index_mem(istate, oid, sbuf.buf, sbuf.len, type, path, flags);
|
|
else
|
|
ret = -1;
|
|
strbuf_release(&sbuf);
|
|
return ret;
|
|
}
|
|
|
|
#define SMALL_FILE_SIZE (32*1024)
|
|
|
|
static int index_core(struct index_state *istate,
|
|
struct object_id *oid, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
if (!size) {
|
|
ret = index_mem(istate, oid, "", size, type, path, flags);
|
|
} else if (size <= SMALL_FILE_SIZE) {
|
|
char *buf = xmalloc(size);
|
|
ssize_t read_result = read_in_full(fd, buf, size);
|
|
if (read_result < 0)
|
|
ret = error_errno(_("read error while indexing %s"),
|
|
path ? path : "<unknown>");
|
|
else if (read_result != size)
|
|
ret = error(_("short read while indexing %s"),
|
|
path ? path : "<unknown>");
|
|
else
|
|
ret = index_mem(istate, oid, buf, size, type, path, flags);
|
|
free(buf);
|
|
} else {
|
|
void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
|
|
ret = index_mem(istate, oid, buf, size, type, path, flags);
|
|
munmap(buf, size);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This creates one packfile per large blob unless bulk-checkin
|
|
* machinery is "plugged".
|
|
*
|
|
* This also bypasses the usual "convert-to-git" dance, and that is on
|
|
* purpose. We could write a streaming version of the converting
|
|
* functions and insert that before feeding the data to fast-import
|
|
* (or equivalent in-core API described above). However, that is
|
|
* somewhat complicated, as we do not know the size of the filter
|
|
* result, which we need to know beforehand when writing a git object.
|
|
* Since the primary motivation for trying to stream from the working
|
|
* tree file and to avoid mmaping it in core is to deal with large
|
|
* binary blobs, they generally do not want to get any conversion, and
|
|
* callers should avoid this code path when filters are requested.
|
|
*/
|
|
static int index_stream(struct object_id *oid, int fd, size_t size,
|
|
enum object_type type, const char *path,
|
|
unsigned flags)
|
|
{
|
|
return index_bulk_checkin(oid, fd, size, type, path, flags);
|
|
}
|
|
|
|
int index_fd(struct index_state *istate, struct object_id *oid,
|
|
int fd, struct stat *st,
|
|
enum object_type type, const char *path, unsigned flags)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Call xsize_t() only when needed to avoid potentially unnecessary
|
|
* die() for large files.
|
|
*/
|
|
if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
|
|
ret = index_stream_convert_blob(istate, oid, fd, path, flags);
|
|
else if (!S_ISREG(st->st_mode))
|
|
ret = index_pipe(istate, oid, fd, type, path, flags);
|
|
else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
|
|
(path && would_convert_to_git(istate, path)))
|
|
ret = index_core(istate, oid, fd, xsize_t(st->st_size),
|
|
type, path, flags);
|
|
else
|
|
ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
|
|
flags);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int index_path(struct index_state *istate, struct object_id *oid,
|
|
const char *path, struct stat *st, unsigned flags)
|
|
{
|
|
int fd;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int rc = 0;
|
|
|
|
switch (st->st_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return error_errno("open(\"%s\")", path);
|
|
if (index_fd(istate, oid, fd, st, OBJ_BLOB, path, flags) < 0)
|
|
return error(_("%s: failed to insert into database"),
|
|
path);
|
|
break;
|
|
case S_IFLNK:
|
|
if (strbuf_readlink(&sb, path, st->st_size))
|
|
return error_errno("readlink(\"%s\")", path);
|
|
if (!(flags & HASH_WRITE_OBJECT))
|
|
hash_object_file(the_hash_algo, sb.buf, sb.len,
|
|
OBJ_BLOB, oid);
|
|
else if (write_object_file(sb.buf, sb.len, OBJ_BLOB, oid))
|
|
rc = error(_("%s: failed to insert into database"), path);
|
|
strbuf_release(&sb);
|
|
break;
|
|
case S_IFDIR:
|
|
return resolve_gitlink_ref(path, "HEAD", oid);
|
|
default:
|
|
return error(_("%s: unsupported file type"), path);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int read_pack_header(int fd, struct pack_header *header)
|
|
{
|
|
if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
|
|
/* "eof before pack header was fully read" */
|
|
return PH_ERROR_EOF;
|
|
|
|
if (header->hdr_signature != htonl(PACK_SIGNATURE))
|
|
/* "protocol error (pack signature mismatch detected)" */
|
|
return PH_ERROR_PACK_SIGNATURE;
|
|
if (!pack_version_ok(header->hdr_version))
|
|
/* "protocol error (pack version unsupported)" */
|
|
return PH_ERROR_PROTOCOL;
|
|
return 0;
|
|
}
|
|
|
|
void assert_oid_type(const struct object_id *oid, enum object_type expect)
|
|
{
|
|
enum object_type type = oid_object_info(the_repository, oid, NULL);
|
|
if (type < 0)
|
|
die(_("%s is not a valid object"), oid_to_hex(oid));
|
|
if (type != expect)
|
|
die(_("%s is not a valid '%s' object"), oid_to_hex(oid),
|
|
type_name(expect));
|
|
}
|
|
|
|
int for_each_file_in_obj_subdir(unsigned int subdir_nr,
|
|
struct strbuf *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
size_t origlen, baselen;
|
|
DIR *dir;
|
|
struct dirent *de;
|
|
int r = 0;
|
|
struct object_id oid;
|
|
|
|
if (subdir_nr > 0xff)
|
|
BUG("invalid loose object subdirectory: %x", subdir_nr);
|
|
|
|
origlen = path->len;
|
|
strbuf_complete(path, '/');
|
|
strbuf_addf(path, "%02x", subdir_nr);
|
|
|
|
dir = opendir(path->buf);
|
|
if (!dir) {
|
|
if (errno != ENOENT)
|
|
r = error_errno(_("unable to open %s"), path->buf);
|
|
strbuf_setlen(path, origlen);
|
|
return r;
|
|
}
|
|
|
|
oid.hash[0] = subdir_nr;
|
|
strbuf_addch(path, '/');
|
|
baselen = path->len;
|
|
|
|
while ((de = readdir_skip_dot_and_dotdot(dir))) {
|
|
size_t namelen;
|
|
|
|
namelen = strlen(de->d_name);
|
|
strbuf_setlen(path, baselen);
|
|
strbuf_add(path, de->d_name, namelen);
|
|
if (namelen == the_hash_algo->hexsz - 2 &&
|
|
!hex_to_bytes(oid.hash + 1, de->d_name,
|
|
the_hash_algo->rawsz - 1)) {
|
|
oid_set_algo(&oid, the_hash_algo);
|
|
if (obj_cb) {
|
|
r = obj_cb(&oid, path->buf, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (cruft_cb) {
|
|
r = cruft_cb(de->d_name, path->buf, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
}
|
|
closedir(dir);
|
|
|
|
strbuf_setlen(path, baselen - 1);
|
|
if (!r && subdir_cb)
|
|
r = subdir_cb(subdir_nr, path->buf, data);
|
|
|
|
strbuf_setlen(path, origlen);
|
|
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_file_in_objdir_buf(struct strbuf *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
int r = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
|
|
subdir_cb, data);
|
|
if (r)
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_file_in_objdir(const char *path,
|
|
each_loose_object_fn obj_cb,
|
|
each_loose_cruft_fn cruft_cb,
|
|
each_loose_subdir_fn subdir_cb,
|
|
void *data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int r;
|
|
|
|
strbuf_addstr(&buf, path);
|
|
r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
|
|
subdir_cb, data);
|
|
strbuf_release(&buf);
|
|
|
|
return r;
|
|
}
|
|
|
|
int for_each_loose_object(each_loose_object_fn cb, void *data,
|
|
enum for_each_object_flags flags)
|
|
{
|
|
struct object_directory *odb;
|
|
|
|
prepare_alt_odb(the_repository);
|
|
for (odb = the_repository->objects->odb; odb; odb = odb->next) {
|
|
int r = for_each_loose_file_in_objdir(odb->path, cb, NULL,
|
|
NULL, data);
|
|
if (r)
|
|
return r;
|
|
|
|
if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int append_loose_object(const struct object_id *oid,
|
|
const char *path UNUSED,
|
|
void *data)
|
|
{
|
|
oidtree_insert(data, oid);
|
|
return 0;
|
|
}
|
|
|
|
struct oidtree *odb_loose_cache(struct object_directory *odb,
|
|
const struct object_id *oid)
|
|
{
|
|
int subdir_nr = oid->hash[0];
|
|
struct strbuf buf = STRBUF_INIT;
|
|
size_t word_bits = bitsizeof(odb->loose_objects_subdir_seen[0]);
|
|
size_t word_index = subdir_nr / word_bits;
|
|
size_t mask = (size_t)1u << (subdir_nr % word_bits);
|
|
uint32_t *bitmap;
|
|
|
|
if (subdir_nr < 0 ||
|
|
subdir_nr >= bitsizeof(odb->loose_objects_subdir_seen))
|
|
BUG("subdir_nr out of range");
|
|
|
|
bitmap = &odb->loose_objects_subdir_seen[word_index];
|
|
if (*bitmap & mask)
|
|
return odb->loose_objects_cache;
|
|
if (!odb->loose_objects_cache) {
|
|
ALLOC_ARRAY(odb->loose_objects_cache, 1);
|
|
oidtree_init(odb->loose_objects_cache);
|
|
}
|
|
strbuf_addstr(&buf, odb->path);
|
|
for_each_file_in_obj_subdir(subdir_nr, &buf,
|
|
append_loose_object,
|
|
NULL, NULL,
|
|
odb->loose_objects_cache);
|
|
*bitmap |= mask;
|
|
strbuf_release(&buf);
|
|
return odb->loose_objects_cache;
|
|
}
|
|
|
|
void odb_clear_loose_cache(struct object_directory *odb)
|
|
{
|
|
oidtree_clear(odb->loose_objects_cache);
|
|
FREE_AND_NULL(odb->loose_objects_cache);
|
|
memset(&odb->loose_objects_subdir_seen, 0,
|
|
sizeof(odb->loose_objects_subdir_seen));
|
|
}
|
|
|
|
static int check_stream_oid(git_zstream *stream,
|
|
const char *hdr,
|
|
unsigned long size,
|
|
const char *path,
|
|
const struct object_id *expected_oid)
|
|
{
|
|
git_hash_ctx c;
|
|
struct object_id real_oid;
|
|
unsigned char buf[4096];
|
|
unsigned long total_read;
|
|
int status = Z_OK;
|
|
|
|
the_hash_algo->init_fn(&c);
|
|
the_hash_algo->update_fn(&c, hdr, stream->total_out);
|
|
|
|
/*
|
|
* We already read some bytes into hdr, but the ones up to the NUL
|
|
* do not count against the object's content size.
|
|
*/
|
|
total_read = stream->total_out - strlen(hdr) - 1;
|
|
|
|
/*
|
|
* This size comparison must be "<=" to read the final zlib packets;
|
|
* see the comment in unpack_loose_rest for details.
|
|
*/
|
|
while (total_read <= size &&
|
|
(status == Z_OK ||
|
|
(status == Z_BUF_ERROR && !stream->avail_out))) {
|
|
stream->next_out = buf;
|
|
stream->avail_out = sizeof(buf);
|
|
if (size - total_read < stream->avail_out)
|
|
stream->avail_out = size - total_read;
|
|
status = git_inflate(stream, Z_FINISH);
|
|
the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
|
|
total_read += stream->next_out - buf;
|
|
}
|
|
git_inflate_end(stream);
|
|
|
|
if (status != Z_STREAM_END) {
|
|
error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid));
|
|
return -1;
|
|
}
|
|
if (stream->avail_in) {
|
|
error(_("garbage at end of loose object '%s'"),
|
|
oid_to_hex(expected_oid));
|
|
return -1;
|
|
}
|
|
|
|
the_hash_algo->final_oid_fn(&real_oid, &c);
|
|
if (!oideq(expected_oid, &real_oid)) {
|
|
error(_("hash mismatch for %s (expected %s)"), path,
|
|
oid_to_hex(expected_oid));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int read_loose_object(const char *path,
|
|
const struct object_id *expected_oid,
|
|
struct object_id *real_oid,
|
|
void **contents,
|
|
struct object_info *oi)
|
|
{
|
|
int ret = -1;
|
|
int fd;
|
|
void *map = NULL;
|
|
unsigned long mapsize;
|
|
git_zstream stream;
|
|
char hdr[MAX_HEADER_LEN];
|
|
unsigned long *size = oi->sizep;
|
|
|
|
fd = git_open(path);
|
|
if (fd >= 0)
|
|
map = map_fd(fd, path, &mapsize);
|
|
if (!map) {
|
|
error_errno(_("unable to mmap %s"), path);
|
|
goto out;
|
|
}
|
|
|
|
if (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr),
|
|
NULL) != ULHR_OK) {
|
|
error(_("unable to unpack header of %s"), path);
|
|
goto out;
|
|
}
|
|
|
|
if (parse_loose_header(hdr, oi) < 0) {
|
|
error(_("unable to parse header of %s"), path);
|
|
git_inflate_end(&stream);
|
|
goto out;
|
|
}
|
|
|
|
if (*oi->typep == OBJ_BLOB && *size > big_file_threshold) {
|
|
if (check_stream_oid(&stream, hdr, *size, path, expected_oid) < 0)
|
|
goto out;
|
|
} else {
|
|
*contents = unpack_loose_rest(&stream, hdr, *size, expected_oid);
|
|
if (!*contents) {
|
|
error(_("unable to unpack contents of %s"), path);
|
|
git_inflate_end(&stream);
|
|
goto out;
|
|
}
|
|
hash_object_file_literally(the_repository->hash_algo,
|
|
*contents, *size,
|
|
oi->type_name->buf, real_oid);
|
|
if (!oideq(expected_oid, real_oid))
|
|
goto out;
|
|
}
|
|
|
|
ret = 0; /* everything checks out */
|
|
|
|
out:
|
|
if (map)
|
|
munmap(map, mapsize);
|
|
return ret;
|
|
}
|