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Merge branch 'jc/extended-fake-ancestor-for-gitlink'

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Instead of requiring the full 40-hex object names on the index
line, we can read submodule commit object names from the textual
diff when synthesizing a fake ancestore tree for "git am -3".

* jc/extended-fake-ancestor-for-gitlink:
  apply: verify submodule commit object name better
This commit is contained in:
Junio C Hamano 2013-02-14 10:28:48 -08:00
parent 260adc87b3 5e026920a9
commit d3354cde33
1 changed files with 38 additions and 2 deletions
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40
builtin/apply.c
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@ -3600,6 +3600,40 @@ static int get_current_sha1(const char *path, unsigned char *sha1)
return 0;
}
static int preimage_sha1_in_gitlink_patch(struct patch *p, unsigned char sha1[20])
{
/*
* A usable gitlink patch has only one fragment (hunk) that looks like:
* @@ -1 +1 @@
* -Subproject commit <old sha1>
* +Subproject commit <new sha1>
* or
* @@ -1 +0,0 @@
* -Subproject commit <old sha1>
* for a removal patch.
*/
struct fragment *hunk = p->fragments;
static const char heading[] = "-Subproject commit ";
char *preimage;
if (/* does the patch have only one hunk? */
hunk && !hunk->next &&
/* is its preimage one line? */
hunk->oldpos == 1 && hunk->oldlines == 1 &&
/* does preimage begin with the heading? */
(preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
!prefixcmp(++preimage, heading) &&
/* does it record full SHA-1? */
!get_sha1_hex(preimage + sizeof(heading) - 1, sha1) &&
preimage[sizeof(heading) + 40 - 1] == '\n' &&
/* does the abbreviated name on the index line agree with it? */
!prefixcmp(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
return 0; /* it all looks fine */
/* we may have full object name on the index line */
return get_sha1_hex(p->old_sha1_prefix, sha1);
}
/* Build an index that contains the just the files needed for a 3way merge */
static void build_fake_ancestor(struct patch *list, const char *filename)
{
@ -3620,8 +3654,10 @@ static void build_fake_ancestor(struct patch *list, const char *filename)
continue;
if (S_ISGITLINK(patch->old_mode)) {
if (get_sha1_hex(patch->old_sha1_prefix, sha1))
die("submoule change for %s without full index name",
if (!preimage_sha1_in_gitlink_patch(patch, sha1))
; /* ok, the textual part looks sane */
else
die("sha1 information is lacking or useless for submoule %s",
name);
} else if (!get_sha1_blob(patch->old_sha1_prefix, sha1)) {
; /* ok */