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Racy GIT (part #2)

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The previous round caught the most trivial case well, but broke
down once index file is updated again.  Smudge problematic
entries (they should be very few if any under normal interactive
workflow) before writing a new index file out.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
2005-12-20 12:12:18 -08:00
parent 29e4d36357
commit 407c8eb0d0
2 changed files with 44 additions and 5 deletions
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32
read-cache.c
View File

@ -87,7 +87,7 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
return 0;
}
int ce_match_stat(struct cache_entry *ce, struct stat *st)
static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
{
unsigned int changed = 0;
@ -143,6 +143,13 @@ int ce_match_stat(struct cache_entry *ce, struct stat *st)
if (ce->ce_size != htonl(st->st_size))
changed |= DATA_CHANGED;
return changed;
}
int ce_match_stat(struct cache_entry *ce, struct stat *st)
{
unsigned int changed = ce_match_stat_basic(ce, st);
/*
* Within 1 second of this sequence:
* echo xyzzy >file && git-update-index --add file
@ -594,6 +601,26 @@ static int ce_flush(SHA_CTX *context, int fd)
return 0;
}
static void ce_smudge_racily_clean_entry(struct cache_entry *ce)
{
/*
* The only thing we care about in this function is to smudge the
* falsely clean entry due to touch-update-touch race, so we leave
* everything else as they are. We are called for entries whose
* ce_mtime match the index file mtime.
*/
struct stat st;
if (lstat(ce->name, &st) < 0)
return;
if (ce_match_stat_basic(ce, &st))
return;
if (ce_modified_check_fs(ce, &st)) {
/* This is "racily clean"; smudge it */
ce->ce_size = htonl(0);
}
}
int write_cache(int newfd, struct cache_entry **cache, int entries)
{
SHA_CTX c;
@ -616,6 +643,9 @@ int write_cache(int newfd, struct cache_entry **cache, int entries)
struct cache_entry *ce = cache[i];
if (!ce->ce_mode)
continue;
if (index_file_timestamp &&
index_file_timestamp <= ntohl(ce->ce_mtime.sec))
ce_smudge_racily_clean_entry(ce);
if (ce_write(&c, newfd, ce, ce_size(ce)) < 0)
return -1;
}