mirror of
https://github.com/git/git
synced 2024-09-13 21:34:42 +00:00
40aaae88ad
Most of the callers except the one in refs.c use the function to update the index file. Among the index writers, everybody except write-tree dies if they cannot open it for writing. This gives the function an extra argument, to tell it to die when it cannot create a new file as the lockfile. The only caller that does not have to die is write-tree, because updating the index for the cache-tree part is optional and not being able to do so does not affect the correctness. I think we do not have to be so careful and make the failure into die() the same way as other callers, but that would be a different patch. Signed-off-by: Junio C Hamano <junkio@cox.net>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* GIT - The information manager from hell
|
|
*
|
|
* Copyright (C) Linus Torvalds, 2005
|
|
*/
|
|
#include "builtin.h"
|
|
#include "cache.h"
|
|
#include "tree.h"
|
|
#include "cache-tree.h"
|
|
|
|
static const char write_tree_usage[] =
|
|
"git-write-tree [--missing-ok] [--prefix=<prefix>/]";
|
|
|
|
int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
|
|
{
|
|
int entries, was_valid, newfd;
|
|
|
|
/* We can't free this memory, it becomes part of a linked list parsed atexit() */
|
|
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
|
|
|
|
entries = read_cache();
|
|
if (entries < 0)
|
|
die("git-write-tree: error reading cache");
|
|
|
|
if (!active_cache_tree)
|
|
active_cache_tree = cache_tree();
|
|
|
|
was_valid = cache_tree_fully_valid(active_cache_tree);
|
|
|
|
if (!was_valid) {
|
|
if (cache_tree_update(active_cache_tree,
|
|
active_cache, active_nr,
|
|
missing_ok, 0) < 0)
|
|
die("git-write-tree: error building trees");
|
|
if (0 <= newfd) {
|
|
if (!write_cache(newfd, active_cache, active_nr)
|
|
&& !close(newfd))
|
|
commit_lock_file(lock_file);
|
|
}
|
|
/* Not being able to write is fine -- we are only interested
|
|
* in updating the cache-tree part, and if the next caller
|
|
* ends up using the old index with unupdated cache-tree part
|
|
* it misses the work we did here, but that is just a
|
|
* performance penalty and not a big deal.
|
|
*/
|
|
}
|
|
|
|
if (prefix) {
|
|
struct cache_tree *subtree =
|
|
cache_tree_find(active_cache_tree, prefix);
|
|
memcpy(sha1, subtree->sha1, 20);
|
|
}
|
|
else
|
|
memcpy(sha1, active_cache_tree->sha1, 20);
|
|
|
|
rollback_lock_file(lock_file);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
|
|
{
|
|
int missing_ok = 0, ret;
|
|
const char *prefix = NULL;
|
|
unsigned char sha1[20];
|
|
|
|
while (1 < argc) {
|
|
const char *arg = argv[1];
|
|
if (!strcmp(arg, "--missing-ok"))
|
|
missing_ok = 1;
|
|
else if (!strncmp(arg, "--prefix=", 9))
|
|
prefix = arg + 9;
|
|
else
|
|
usage(write_tree_usage);
|
|
argc--; argv++;
|
|
}
|
|
|
|
if (argc > 2)
|
|
die("too many options");
|
|
|
|
ret = write_tree(sha1, missing_ok, prefix);
|
|
printf("%s\n", sha1_to_hex(sha1));
|
|
|
|
return ret;
|
|
}
|