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replace: check mergetags when using --graft

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When using --graft, with a mergetag in the original
commit, we should check that the commit pointed to by
the mergetag is still a parent of then new commit we
create, otherwise the mergetag could be misleading.

If the commit pointed to by the mergetag is no more
a parent of the new commit, we could remove the
mergetag, but in this case there is a good chance
that the title or other elements of the commit might
also be misleading. So let's just error out and
suggest to use --edit instead on the commit.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder 2014-07-19 17:01:14 +02:00 committed by Junio C Hamano
parent 60e2f5a5af
commit 25a05a8cae
1 changed files with 47 additions and 0 deletions
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47
builtin/replace.c
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@ -13,6 +13,7 @@
#include "refs.h"
#include "parse-options.h"
#include "run-command.h"
#include "tag.h"
static const char * const git_replace_usage[] = {
N_("git replace [-f] <object> <replacement>"),
@ -325,6 +326,50 @@ static void replace_parents(struct strbuf *buf, int argc, const char **argv)
strbuf_release(&new_parents);
}
struct check_mergetag_data {
int argc;
const char **argv;
};
static void check_one_mergetag(struct commit *commit,
struct commit_extra_header *extra,
void *data)
{
struct check_mergetag_data *mergetag_data = (struct check_mergetag_data *)data;
const char *ref = mergetag_data->argv[0];
unsigned char tag_sha1[20];
struct tag *tag;
int i;
hash_sha1_file(extra->value, extra->len, typename(OBJ_TAG), tag_sha1);
tag = lookup_tag(tag_sha1);
if (!tag)
die(_("bad mergetag in commit '%s'"), ref);
if (parse_tag_buffer(tag, extra->value, extra->len))
die(_("malformed mergetag in commit '%s'"), ref);
/* iterate over new parents */
for (i = 1; i < mergetag_data->argc; i++) {
unsigned char sha1[20];
if (get_sha1(mergetag_data->argv[i], sha1) < 0)
die(_("Not a valid object name: '%s'"), mergetag_data->argv[i]);
if (!hashcmp(tag->tagged->sha1, sha1))
return; /* found */
}
die(_("original commit '%s' contains mergetag '%s' that is discarded; "
"use --edit instead of --graft"), ref, sha1_to_hex(tag_sha1));
}
static void check_mergetags(struct commit *commit, int argc, const char **argv)
{
struct check_mergetag_data mergetag_data;
mergetag_data.argc = argc;
mergetag_data.argv = argv;
for_each_mergetag(check_one_mergetag, commit, &mergetag_data);
}
static int create_graft(int argc, const char **argv, int force)
{
unsigned char old[20], new[20];
@ -349,6 +394,8 @@ static int create_graft(int argc, const char **argv, int force)
warning(_("the signature will be removed in the replacement commit!"));
}
check_mergetags(commit, argc, argv);
if (write_sha1_file(buf.buf, buf.len, commit_type, new))
die(_("could not write replacement commit for: '%s'"), old_ref);