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rebase: factor out branch_base calculation 

Separate out calculating the merge base between 'onto' and 'HEAD' from
the check for whether we can fast-forward or not. This means we can skip
the fast-forward checks when the rebase is forced and avoid calculating
the merge-base between 'HEAD' and 'onto' when --keep-base is given.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Phillip Wood 2022-10-17 13:17:43 +00:00 committed by Junio C Hamano
parent a77060218d
commit d42c9ffa0f
1 changed files with 20 additions and 13 deletions
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33
builtin/rebase.c
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@ -865,13 +865,9 @@ static int can_fast_forward(struct commit *onto, struct commit *upstream,
struct commit_list *merge_bases = NULL;
int res = 0;

merge_bases = get_merge_bases(onto, head);
if (!merge_bases || merge_bases->next) {
oidcpy(branch_base, null_oid());
goto done;
}
if (is_null_oid(branch_base))
goto done; /* fill_branch_base() found multiple merge bases */

oidcpy(branch_base, &merge_bases->item->object.oid);
if (!oideq(branch_base, &onto->object.oid))
goto done;

@ -881,7 +877,6 @@ static int can_fast_forward(struct commit *onto, struct commit *upstream,
if (!upstream)
goto done;

free_commit_list(merge_bases);
merge_bases = get_merge_bases(upstream, head);
if (!merge_bases || merge_bases->next)
goto done;
@ -896,6 +891,20 @@ done:
return res && is_linear_history(onto, head);
}

static void fill_branch_base(struct rebase_options *options,
struct object_id *branch_base)
{
struct commit_list *merge_bases = NULL;

merge_bases = get_merge_bases(options->onto, options->orig_head);
if (!merge_bases || merge_bases->next)
oidcpy(branch_base, null_oid());
else
oidcpy(branch_base, &merge_bases->item->object.oid);

free_commit_list(merge_bases);
}

static int parse_opt_am(const struct option *opt, const char *arg, int unset)
{
struct rebase_options *opts = opt->value;
@ -1660,6 +1669,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (!options.onto)
die(_("Does not point to a valid commit '%s'"),
options.onto_name);
fill_branch_base(&options, &branch_base);
}

if (options.fork_point > 0)
@ -1689,13 +1699,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
* Check if we are already based on onto with linear history,
* in which case we could fast-forward without replacing the commits
* with new commits recreated by replaying their changes.
*
* Note that can_fast_forward() initializes branch_base, so we have to
* call it before checking allow_preemptive_ff.
*/
if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
options.orig_head, &branch_base) &&
allow_preemptive_ff) {
if (allow_preemptive_ff &&
can_fast_forward(options.onto, options.upstream, options.restrict_revision,
options.orig_head, &branch_base)) {
int flag;

if (!(options.flags & REBASE_FORCE)) {