mirror of
https://github.com/git/git.git
synced 2024-12-12 19:34:35 +08:00
e702496e43
This abstracts away the size of the hash values when copying them from memory location to memory location, much as the introduction of hashcmp abstracted away hash value comparsion. A few call sites were using char* rather than unsigned char* so I added the cast rather than open hashcpy to be void*. This is a reasonable tradeoff as most call sites already use unsigned char* and the existing hashcmp is also declared to be unsigned char*. [jc: Splitted the patch to "master" part, to be followed by a patch for merge-recursive.c which is not in "master" yet. Fixed the cast in the latter hunk to combine-diff.c which was wrong in the original. Also converted ones left-over in combine-diff.c, diff-lib.c and upload-pack.c ] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
255 lines
5.9 KiB
C
255 lines
5.9 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
|
|
#include "cache.h"
|
|
#include "object.h"
|
|
#include "tree.h"
|
|
#include "tree-walk.h"
|
|
#include "cache-tree.h"
|
|
#include "unpack-trees.h"
|
|
#include "builtin.h"
|
|
|
|
static struct object_list *trees;
|
|
|
|
static int list_tree(unsigned char *sha1)
|
|
{
|
|
struct tree *tree = parse_tree_indirect(sha1);
|
|
if (!tree)
|
|
return -1;
|
|
object_list_append(&tree->object, &trees);
|
|
return 0;
|
|
}
|
|
|
|
static int read_cache_unmerged(void)
|
|
{
|
|
int i;
|
|
struct cache_entry **dst;
|
|
struct cache_entry *last = NULL;
|
|
|
|
read_cache();
|
|
dst = active_cache;
|
|
for (i = 0; i < active_nr; i++) {
|
|
struct cache_entry *ce = active_cache[i];
|
|
if (ce_stage(ce)) {
|
|
if (last && !strcmp(ce->name, last->name))
|
|
continue;
|
|
cache_tree_invalidate_path(active_cache_tree, ce->name);
|
|
last = ce;
|
|
ce->ce_mode = 0;
|
|
ce->ce_flags &= ~htons(CE_STAGEMASK);
|
|
}
|
|
*dst++ = ce;
|
|
}
|
|
active_nr = dst - active_cache;
|
|
return !!last;
|
|
}
|
|
|
|
static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
|
|
{
|
|
struct tree_desc desc;
|
|
struct name_entry entry;
|
|
int cnt;
|
|
|
|
hashcpy(it->sha1, tree->object.sha1);
|
|
desc.buf = tree->buffer;
|
|
desc.size = tree->size;
|
|
cnt = 0;
|
|
while (tree_entry(&desc, &entry)) {
|
|
if (!S_ISDIR(entry.mode))
|
|
cnt++;
|
|
else {
|
|
struct cache_tree_sub *sub;
|
|
struct tree *subtree = lookup_tree(entry.sha1);
|
|
if (!subtree->object.parsed)
|
|
parse_tree(subtree);
|
|
sub = cache_tree_sub(it, entry.path);
|
|
sub->cache_tree = cache_tree();
|
|
prime_cache_tree_rec(sub->cache_tree, subtree);
|
|
cnt += sub->cache_tree->entry_count;
|
|
}
|
|
}
|
|
it->entry_count = cnt;
|
|
}
|
|
|
|
static void prime_cache_tree(void)
|
|
{
|
|
struct tree *tree = (struct tree *)trees->item;
|
|
if (!tree)
|
|
return;
|
|
active_cache_tree = cache_tree();
|
|
prime_cache_tree_rec(active_cache_tree, tree);
|
|
|
|
}
|
|
|
|
static const char read_tree_usage[] = "git-read-tree (<sha> | [[-m [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] <sha1> [<sha2> [<sha3>]])";
|
|
|
|
static struct lock_file lock_file;
|
|
|
|
int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
|
|
{
|
|
int i, newfd, stage = 0;
|
|
unsigned char sha1[20];
|
|
struct unpack_trees_options opts;
|
|
|
|
memset(&opts, 0, sizeof(opts));
|
|
opts.head_idx = -1;
|
|
|
|
setup_git_directory();
|
|
git_config(git_default_config);
|
|
|
|
newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
|
|
|
|
git_config(git_default_config);
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
/* "-u" means "update", meaning that a merge will update
|
|
* the working tree.
|
|
*/
|
|
if (!strcmp(arg, "-u")) {
|
|
opts.update = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "-v")) {
|
|
opts.verbose_update = 1;
|
|
continue;
|
|
}
|
|
|
|
/* "-i" means "index only", meaning that a merge will
|
|
* not even look at the working tree.
|
|
*/
|
|
if (!strcmp(arg, "-i")) {
|
|
opts.index_only = 1;
|
|
continue;
|
|
}
|
|
|
|
/* "--prefix=<subdirectory>/" means keep the current index
|
|
* entries and put the entries from the tree under the
|
|
* given subdirectory.
|
|
*/
|
|
if (!strncmp(arg, "--prefix=", 9)) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
opts.prefix = arg + 9;
|
|
opts.merge = 1;
|
|
stage = 1;
|
|
if (read_cache_unmerged())
|
|
die("you need to resolve your current index first");
|
|
continue;
|
|
}
|
|
|
|
/* This differs from "-m" in that we'll silently ignore
|
|
* unmerged entries and overwrite working tree files that
|
|
* correspond to them.
|
|
*/
|
|
if (!strcmp(arg, "--reset")) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
opts.reset = 1;
|
|
opts.merge = 1;
|
|
stage = 1;
|
|
read_cache_unmerged();
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "--trivial")) {
|
|
opts.trivial_merges_only = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!strcmp(arg, "--aggressive")) {
|
|
opts.aggressive = 1;
|
|
continue;
|
|
}
|
|
|
|
/* "-m" stands for "merge", meaning we start in stage 1 */
|
|
if (!strcmp(arg, "-m")) {
|
|
if (stage || opts.merge || opts.prefix)
|
|
usage(read_tree_usage);
|
|
if (read_cache_unmerged())
|
|
die("you need to resolve your current index first");
|
|
stage = 1;
|
|
opts.merge = 1;
|
|
continue;
|
|
}
|
|
|
|
/* using -u and -i at the same time makes no sense */
|
|
if (1 < opts.index_only + opts.update)
|
|
usage(read_tree_usage);
|
|
|
|
if (get_sha1(arg, sha1))
|
|
die("Not a valid object name %s", arg);
|
|
if (list_tree(sha1) < 0)
|
|
die("failed to unpack tree object %s", arg);
|
|
stage++;
|
|
}
|
|
if ((opts.update||opts.index_only) && !opts.merge)
|
|
usage(read_tree_usage);
|
|
|
|
if (opts.prefix) {
|
|
int pfxlen = strlen(opts.prefix);
|
|
int pos;
|
|
if (opts.prefix[pfxlen-1] != '/')
|
|
die("prefix must end with /");
|
|
if (stage != 2)
|
|
die("binding merge takes only one tree");
|
|
pos = cache_name_pos(opts.prefix, pfxlen);
|
|
if (0 <= pos)
|
|
die("corrupt index file");
|
|
pos = -pos-1;
|
|
if (pos < active_nr &&
|
|
!strncmp(active_cache[pos]->name, opts.prefix, pfxlen))
|
|
die("subdirectory '%s' already exists.", opts.prefix);
|
|
pos = cache_name_pos(opts.prefix, pfxlen-1);
|
|
if (0 <= pos)
|
|
die("file '%.*s' already exists.",
|
|
pfxlen-1, opts.prefix);
|
|
}
|
|
|
|
if (opts.merge) {
|
|
if (stage < 2)
|
|
die("just how do you expect me to merge %d trees?", stage-1);
|
|
switch (stage - 1) {
|
|
case 1:
|
|
opts.fn = opts.prefix ? bind_merge : oneway_merge;
|
|
break;
|
|
case 2:
|
|
opts.fn = twoway_merge;
|
|
break;
|
|
case 3:
|
|
default:
|
|
opts.fn = threeway_merge;
|
|
cache_tree_free(&active_cache_tree);
|
|
break;
|
|
}
|
|
|
|
if (stage - 1 >= 3)
|
|
opts.head_idx = stage - 2;
|
|
else
|
|
opts.head_idx = 1;
|
|
}
|
|
|
|
unpack_trees(trees, &opts);
|
|
|
|
/*
|
|
* When reading only one tree (either the most basic form,
|
|
* "-m ent" or "--reset ent" form), we can obtain a fully
|
|
* valid cache-tree because the index must match exactly
|
|
* what came from the tree.
|
|
*/
|
|
if (trees && trees->item && !opts.prefix && (!opts.merge || (stage == 2))) {
|
|
cache_tree_free(&active_cache_tree);
|
|
prime_cache_tree();
|
|
}
|
|
|
|
if (write_cache(newfd, active_cache, active_nr) ||
|
|
close(newfd) || commit_lock_file(&lock_file))
|
|
die("unable to write new index file");
|
|
return 0;
|
|
}
|