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built-in rebase: reinstate checkout -q behavior where appropriate

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When we converted a `git checkout -q $onto^0` call to use
`reset_head()`, we inadvertently incurred a change from a twoway_merge
to a oneway_merge, as if we wanted a `git reset --hard` instead.

This has performance ramifications under certain, though, as the
oneway_merge needs to lstat() every single index entry whereas
twoway_merge does not.

So let's go back to the old behavior.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2018-11-12 03:44:32 -08:00 committed by Junio C Hamano
parent 73d6d7b24b
commit bac2a1e36f
1 changed files with 25 additions and 15 deletions
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40
builtin/rebase.c
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@ -523,14 +523,16 @@ finished_rebase:
#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
#define RESET_HEAD_DETACH (1<<0)
#define RESET_HEAD_HARD (1<<1)
static int reset_head(struct object_id *oid, const char *action,
const char *switch_to_branch, unsigned flags,
const char *reflog_orig_head, const char *reflog_head)
{
unsigned detach_head = flags & RESET_HEAD_DETACH;
unsigned reset_hard = flags & RESET_HEAD_HARD;
struct object_id head_oid;
struct tree_desc desc;
struct tree_desc desc[2] = { { NULL }, { NULL } };
struct lock_file lock = LOCK_INIT;
struct unpack_trees_options unpack_tree_opts;
struct tree *tree;
@ -539,7 +541,7 @@ static int reset_head(struct object_id *oid, const char *action,
size_t prefix_len;
struct object_id *orig = NULL, oid_orig,
*old_orig = NULL, oid_old_orig;
int ret = 0;
int ret = 0, nr = 0;
if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
BUG("Not a fully qualified branch: '%s'", switch_to_branch);
@ -549,20 +551,20 @@ static int reset_head(struct object_id *oid, const char *action,
goto leave_reset_head;
}
if (!oid) {
if (get_oid("HEAD", &head_oid)) {
ret = error(_("could not determine HEAD revision"));
goto leave_reset_head;
}
oid = &head_oid;
if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
ret = error(_("could not determine HEAD revision"));
goto leave_reset_head;
}
if (!oid)
oid = &head_oid;
memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
setup_unpack_trees_porcelain(&unpack_tree_opts, action);
unpack_tree_opts.head_idx = 1;
unpack_tree_opts.src_index = the_repository->index;
unpack_tree_opts.dst_index = the_repository->index;
unpack_tree_opts.fn = oneway_merge;
unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
unpack_tree_opts.update = 1;
unpack_tree_opts.merge = 1;
if (!detach_head)
@ -573,12 +575,17 @@ static int reset_head(struct object_id *oid, const char *action,
goto leave_reset_head;
}
if (!fill_tree_descriptor(&desc, oid)) {
if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
goto leave_reset_head;
}
if (unpack_trees(1, &desc, &unpack_tree_opts)) {
if (!fill_tree_descriptor(&desc[nr++], oid)) {
ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
goto leave_reset_head;
}
if (unpack_trees(nr, desc, &unpack_tree_opts)) {
ret = -1;
goto leave_reset_head;
}
@ -625,7 +632,8 @@ static int reset_head(struct object_id *oid, const char *action,
leave_reset_head:
strbuf_release(&msg);
rollback_lock_file(&lock);
free((void *)desc.buffer);
while (nr)
free((void *)desc[--nr].buffer);
return ret;
}
@ -1003,7 +1011,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
rerere_clear(&merge_rr);
string_list_clear(&merge_rr, 1);
if (reset_head(NULL, "reset", NULL, 0, NULL, NULL) < 0)
if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
NULL, NULL) < 0)
die(_("could not discard worktree changes"));
if (read_basic_state(&options))
exit(1);
@ -1019,7 +1028,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (read_basic_state(&options))
exit(1);
if (reset_head(&options.orig_head, "reset",
options.head_name, 0, NULL, NULL) < 0)
options.head_name, RESET_HEAD_HARD,
NULL, NULL) < 0)
die(_("could not move back to %s"),
oid_to_hex(&options.orig_head));
ret = finish_rebase(&options);
@ -1383,7 +1393,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
write_file(autostash, "%s", oid_to_hex(&oid));
printf(_("Created autostash: %s\n"), buf.buf);
if (reset_head(&head->object.oid, "reset --hard",
NULL, 0, NULL, NULL) < 0)
NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
die(_("could not reset --hard"));
printf(_("HEAD is now at %s"),
find_unique_abbrev(&head->object.oid,