From 5e026920a9465c6c3e026c5bf0d1c4d9d3f05cfa Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Tue, 5 Feb 2013 11:19:32 -0800 Subject: [PATCH] apply: verify submodule commit object name better A textual patch also records the submodule commit object name in full. Make the parsing more robust by reading from there and verifying the (possibly abbreviated) name on the index line matches. Signed-off-by: Junio C Hamano --- builtin/apply.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/builtin/apply.c b/builtin/apply.c index 1f78e2cfa..445fea7af 100644 --- a/builtin/apply.c +++ b/builtin/apply.c @@ -3587,6 +3587,40 @@ 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 + * +Subproject commit + * or + * @@ -1 +0,0 @@ + * -Subproject commit + * 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) { @@ -3607,8 +3641,10 @@ 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 */ -- 2.26.2