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Update write-tree to use cache-tree.

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The updated write-tree reads from $GIT_DIR/index.aux to pick up
subtree objects information, updates the cache-tree with the
index, and updates index.aux file after writing a tree out of
the index file.

Until update-index and other programs that modify the index are
updated to maintain index.aux file, the index.aux file written
by the last write-tree will become stale immediately after they
update the index, which will result in the whole tree
recomputation just like the original write-tree.

The idea is to convert those commands to invalidate cache-tree
whenever they touch the index entries, and write updated
index.aux out.  After the index is updated with them, write-tree
will be able to reuse the parts of the cache-tree that have not
been touched.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-04-23 16:52:35 -07:00
parent 749864627c
commit a52139b47e
1 changed files with 12 additions and 125 deletions
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137
write-tree.c
View file

@ -5,96 +5,23 @@
*/
#include "cache.h"
#include "tree.h"
#include "cache-tree.h"
static unsigned char active_cache_sha1[20];
static struct cache_tree *active_cache_tree;
static int missing_ok = 0;
static int check_valid_sha1(unsigned char *sha1)
{
int ret;
/* If we were anal, we'd check that the sha1 of the contents actually matches */
ret = has_sha1_file(sha1);
if (ret == 0)
perror(sha1_file_name(sha1));
return ret ? 0 : -1;
}
static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
{
unsigned char subdir_sha1[20];
unsigned long size, offset;
char *buffer;
int nr;
/* Guess at some random initial size */
size = 8192;
buffer = xmalloc(size);
offset = 0;
nr = 0;
while (nr < maxentries) {
struct cache_entry *ce = cachep[nr];
const char *pathname = ce->name, *filename, *dirname;
int pathlen = ce_namelen(ce), entrylen;
unsigned char *sha1;
unsigned int mode;
/* Did we hit the end of the directory? Return how many we wrote */
if (baselen >= pathlen || memcmp(base, pathname, baselen))
break;
sha1 = ce->sha1;
mode = ntohl(ce->ce_mode);
/* Do we have _further_ subdirectories? */
filename = pathname + baselen;
dirname = strchr(filename, '/');
if (dirname) {
int subdir_written;
subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
nr += subdir_written;
/* Now we need to write out the directory entry into this tree.. */
mode = S_IFDIR;
pathlen = dirname - pathname;
/* ..but the directory entry doesn't count towards the total count */
nr--;
sha1 = subdir_sha1;
}
if (!missing_ok && check_valid_sha1(sha1) < 0)
exit(1);
entrylen = pathlen - baselen;
if (offset + entrylen + 100 > size) {
size = alloc_nr(offset + entrylen + 100);
buffer = xrealloc(buffer, size);
}
offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
buffer[offset++] = 0;
memcpy(buffer + offset, sha1, 20);
offset += 20;
nr++;
}
write_sha1_file(buffer, offset, tree_type, returnsha1);
free(buffer);
return nr;
}
static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
int main(int argc, char **argv)
{
int i, funny;
int entries;
unsigned char sha1[20];
setup_git_directory();
entries = read_cache();
entries = read_cache_1(active_cache_sha1);
active_cache_tree = read_cache_tree(active_cache_sha1);
if (argc == 2) {
if (!strcmp(argv[1], "--missing-ok"))
missing_ok = 1;
@ -108,51 +35,11 @@ int main(int argc, char **argv)
if (entries < 0)
die("git-write-tree: error reading cache");
/* Verify that the tree is merged */
funny = 0;
for (i = 0; i < entries; i++) {
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce)) {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
}
}
if (funny)
die("git-write-tree: not able to write tree");
if (cache_tree_update(active_cache_tree, active_cache, active_nr,
missing_ok))
die("git-write-tree: error building trees");
write_cache_tree(active_cache_sha1, active_cache_tree);
/* Also verify that the cache does not have path and path/file
* at the same time. At this point we know the cache has only
* stage 0 entries.
*/
funny = 0;
for (i = 0; i < entries - 1; i++) {
/* path/file always comes after path because of the way
* the cache is sorted. Also path can appear only once,
* which means conflicting one would immediately follow.
*/
const char *this_name = active_cache[i]->name;
const char *next_name = active_cache[i+1]->name;
int this_len = strlen(this_name);
if (this_len < strlen(next_name) &&
strncmp(this_name, next_name, this_len) == 0 &&
next_name[this_len] == '/') {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "You have both %s and %s\n",
this_name, next_name);
}
}
if (funny)
die("git-write-tree: not able to write tree");
/* Ok, write it out */
if (write_tree(active_cache, entries, "", 0, sha1) != entries)
die("git-write-tree: internal error");
printf("%s\n", sha1_to_hex(sha1));
printf("%s\n", sha1_to_hex(active_cache_tree->sha1));
return 0;
}