mirror of
https://github.com/git/git.git
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e7da938570
Use of the `the_repository` variable is deprecated nowadays, and we slowly but steadily convert the codebase to not use it anymore. Instead, callers should be passing down the repository to work on via parameters. It is hard though to prove that a given code unit does not use this variable anymore. The most trivial case, merely demonstrating that there is no direct use of `the_repository`, is already a bit of a pain during code reviews as the reviewer needs to manually verify claims made by the patch author. The bigger problem though is that we have many interfaces that implicitly rely on `the_repository`. Introduce a new `USE_THE_REPOSITORY_VARIABLE` macro that allows code units to opt into usage of `the_repository`. The intent of this macro is to demonstrate that a certain code unit does not use this variable anymore, and to keep it from new dependencies on it in future changes, be it explicit or implicit For now, the macro only guards `the_repository` itself as well as `the_hash_algo`. There are many more known interfaces where we have an implicit dependency on `the_repository`, but those are not guarded at the current point in time. Over time though, we should start to add guards as required (or even better, just remove them). Define the macro as required in our code units. As expected, most of our code still relies on the global variable. Nearly all of our builtins rely on the variable as there is no way yet to pass `the_repository` to their entry point. For now, declare the macro in "biultin.h" to keep the required changes at least a little bit more contained. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
203 lines
5.5 KiB
C
203 lines
5.5 KiB
C
#define USE_THE_REPOSITORY_VARIABLE
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#include "git-compat-util.h"
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#include "environment.h"
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#include "hex.h"
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#include "repository.h"
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#include "pack.h"
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#include "progress.h"
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#include "packfile.h"
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#include "object-file.h"
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#include "object-store-ll.h"
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struct idx_entry {
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off_t offset;
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unsigned int nr;
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};
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static int compare_entries(const void *e1, const void *e2)
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{
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const struct idx_entry *entry1 = e1;
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const struct idx_entry *entry2 = e2;
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if (entry1->offset < entry2->offset)
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return -1;
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if (entry1->offset > entry2->offset)
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return 1;
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return 0;
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}
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int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
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off_t offset, off_t len, unsigned int nr)
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{
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const uint32_t *index_crc;
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uint32_t data_crc = crc32(0, NULL, 0);
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do {
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unsigned long avail;
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void *data = use_pack(p, w_curs, offset, &avail);
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if (avail > len)
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avail = len;
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data_crc = crc32(data_crc, data, avail);
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offset += avail;
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len -= avail;
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} while (len);
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index_crc = p->index_data;
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index_crc += 2 + 256 + (size_t)p->num_objects * (the_hash_algo->rawsz/4) + nr;
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return data_crc != ntohl(*index_crc);
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}
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static int verify_packfile(struct repository *r,
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struct packed_git *p,
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struct pack_window **w_curs,
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verify_fn fn,
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struct progress *progress, uint32_t base_count)
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{
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off_t index_size = p->index_size;
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const unsigned char *index_base = p->index_data;
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git_hash_ctx ctx;
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unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
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off_t offset = 0, pack_sig_ofs = 0;
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uint32_t nr_objects, i;
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int err = 0;
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struct idx_entry *entries;
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if (!is_pack_valid(p))
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return error("packfile %s cannot be accessed", p->pack_name);
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r->hash_algo->init_fn(&ctx);
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do {
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unsigned long remaining;
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unsigned char *in = use_pack(p, w_curs, offset, &remaining);
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offset += remaining;
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if (!pack_sig_ofs)
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pack_sig_ofs = p->pack_size - r->hash_algo->rawsz;
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if (offset > pack_sig_ofs)
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remaining -= (unsigned int)(offset - pack_sig_ofs);
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r->hash_algo->update_fn(&ctx, in, remaining);
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} while (offset < pack_sig_ofs);
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r->hash_algo->final_fn(hash, &ctx);
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pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
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if (!hasheq(hash, pack_sig, the_repository->hash_algo))
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err = error("%s pack checksum mismatch",
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p->pack_name);
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if (!hasheq(index_base + index_size - r->hash_algo->hexsz, pack_sig,
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the_repository->hash_algo))
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err = error("%s pack checksum does not match its index",
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p->pack_name);
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unuse_pack(w_curs);
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/* Make sure everything reachable from idx is valid. Since we
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* have verified that nr_objects matches between idx and pack,
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* we do not do scan-streaming check on the pack file.
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*/
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nr_objects = p->num_objects;
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ALLOC_ARRAY(entries, nr_objects + 1);
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entries[nr_objects].offset = pack_sig_ofs;
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/* first sort entries by pack offset, since unpacking them is more efficient that way */
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for (i = 0; i < nr_objects; i++) {
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entries[i].offset = nth_packed_object_offset(p, i);
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entries[i].nr = i;
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}
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QSORT(entries, nr_objects, compare_entries);
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for (i = 0; i < nr_objects; i++) {
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void *data;
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struct object_id oid;
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enum object_type type;
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unsigned long size;
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off_t curpos;
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int data_valid;
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if (nth_packed_object_id(&oid, p, entries[i].nr) < 0)
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BUG("unable to get oid of object %lu from %s",
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(unsigned long)entries[i].nr, p->pack_name);
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if (p->index_version > 1) {
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off_t offset = entries[i].offset;
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off_t len = entries[i+1].offset - offset;
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unsigned int nr = entries[i].nr;
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if (check_pack_crc(p, w_curs, offset, len, nr))
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err = error("index CRC mismatch for object %s "
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"from %s at offset %"PRIuMAX"",
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oid_to_hex(&oid),
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p->pack_name, (uintmax_t)offset);
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}
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curpos = entries[i].offset;
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type = unpack_object_header(p, w_curs, &curpos, &size);
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unuse_pack(w_curs);
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if (type == OBJ_BLOB && big_file_threshold <= size) {
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/*
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* Let stream_object_signature() check it with
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* the streaming interface; no point slurping
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* the data in-core only to discard.
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*/
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data = NULL;
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data_valid = 0;
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} else {
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data = unpack_entry(r, p, entries[i].offset, &type, &size);
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data_valid = 1;
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}
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if (data_valid && !data)
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err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
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oid_to_hex(&oid), p->pack_name,
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(uintmax_t)entries[i].offset);
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else if (data && check_object_signature(r, &oid, data, size,
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type) < 0)
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err = error("packed %s from %s is corrupt",
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oid_to_hex(&oid), p->pack_name);
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else if (!data && stream_object_signature(r, &oid) < 0)
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err = error("packed %s from %s is corrupt",
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oid_to_hex(&oid), p->pack_name);
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else if (fn) {
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int eaten = 0;
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err |= fn(&oid, type, size, data, &eaten);
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if (eaten)
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data = NULL;
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}
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if (((base_count + i) & 1023) == 0)
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display_progress(progress, base_count + i);
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free(data);
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}
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display_progress(progress, base_count + i);
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free(entries);
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return err;
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}
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int verify_pack_index(struct packed_git *p)
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{
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int err = 0;
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if (open_pack_index(p))
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return error("packfile %s index not opened", p->pack_name);
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/* Verify SHA1 sum of the index file */
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if (!hashfile_checksum_valid(p->index_data, p->index_size))
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err = error("Packfile index for %s hash mismatch",
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p->pack_name);
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return err;
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}
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int verify_pack(struct repository *r, struct packed_git *p, verify_fn fn,
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struct progress *progress, uint32_t base_count)
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{
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int err = 0;
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struct pack_window *w_curs = NULL;
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err |= verify_pack_index(p);
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if (!p->index_data)
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return -1;
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err |= verify_packfile(r, p, &w_curs, fn, progress, base_count);
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unuse_pack(&w_curs);
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return err;
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}
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