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commit: drop duplicated parents

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The scripted version of git-commit internally used git-commit-tree which
omitted duplicated parents given from the command line.  This prevented a
nonsensical octopus merge from getting created even when you said "git
merge A B" while you are already on branch A.

However, when git-commit was rewritten in C, this sanity check was lost.
This resurrects it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2008-06-02 22:17:42 -07:00
parent 69e66f5500
commit 67bfc030d7
2 changed files with 23 additions and 0 deletions
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9
builtin-commit.c
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@ -883,10 +883,19 @@ static void add_parent(struct strbuf *sb, const unsigned char *sha1)
{
struct object *obj = parse_object(sha1);
const char *parent = sha1_to_hex(sha1);
const char *cp;
if (!obj)
die("Unable to find commit parent %s", parent);
if (obj->type != OBJ_COMMIT)
die("Parent %s isn't a proper commit", parent);
for (cp = sb->buf; cp && (cp = strstr(cp, "\nparent ")); cp += 8) {
if (!memcmp(cp + 8, parent, 40) && cp[48] == '\n') {
error("duplicate parent %s ignored", parent);
return;
}
}
strbuf_addf(sb, "parent %s\n", parent);
}