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rebase: use correct base for --keep-base when a branch is given

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--keep-base rebases onto the merge base of the given upstream and the
current HEAD regardless of whether a branch is given. This is contrary
to the documentation and to the option's intended purpose. Instead,
rebase onto the merge base of the given upstream and the given branch.

Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Alex Henrie 2022-04-20 22:42:33 -06:00 committed by Junio C Hamano
parent 6cd33dceed
commit 9e5ebe9668
3 changed files with 60 additions and 29 deletions
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5
Documentation/git-rebase.txt
View file

@ -215,9 +215,10 @@ leave out at most one of A and B, in which case it defaults to HEAD.
--keep-base::
Set the starting point at which to create the new commits to the
merge base of <upstream> <branch>. Running
merge base of <upstream> and <branch>. Running
'git rebase --keep-base <upstream> <branch>' is equivalent to
running 'git rebase --onto <upstream>... <upstream>'.
running
'git rebase --onto <upstream>...<branch> <upstream> <branch>'.
+
This option is useful in the case where one is developing a feature on
top of an upstream branch. While the feature is being worked on, the

55
builtin/rebase.c
View file

@ -1583,33 +1583,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
options.upstream_arg = "--root";
}
/* Make sure the branch to rebase onto is valid. */
if (keep_base) {
strbuf_reset(&buf);
strbuf_addstr(&buf, options.upstream_name);
strbuf_addstr(&buf, "...");
options.onto_name = xstrdup(buf.buf);
} else if (!options.onto_name)
options.onto_name = options.upstream_name;
if (strstr(options.onto_name, "...")) {
if (get_oid_mb(options.onto_name, &merge_base) < 0) {
if (keep_base)
die(_("'%s': need exactly one merge base with branch"),
options.upstream_name);
else
die(_("'%s': need exactly one merge base"),
options.onto_name);
}
options.onto = lookup_commit_or_die(&merge_base,
options.onto_name);
} else {
options.onto =
lookup_commit_reference_by_name(options.onto_name);
if (!options.onto)
die(_("Does not point to a valid commit '%s'"),
options.onto_name);
}
/*
* If the branch to rebase is given, that is the branch we will rebase
* branch_name -- branch/commit being rebased, or
@ -1659,6 +1632,34 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
} else
BUG("unexpected number of arguments left to parse");
/* Make sure the branch to rebase onto is valid. */
if (keep_base) {
strbuf_reset(&buf);
strbuf_addstr(&buf, options.upstream_name);
strbuf_addstr(&buf, "...");
strbuf_addstr(&buf, branch_name);
options.onto_name = xstrdup(buf.buf);
} else if (!options.onto_name)
options.onto_name = options.upstream_name;
if (strstr(options.onto_name, "...")) {
if (get_oid_mb(options.onto_name, &merge_base) < 0) {
if (keep_base)
die(_("'%s': need exactly one merge base with branch"),
options.upstream_name);
else
die(_("'%s': need exactly one merge base"),
options.onto_name);
}
options.onto = lookup_commit_or_die(&merge_base,
options.onto_name);
} else {
options.onto =
lookup_commit_reference_by_name(options.onto_name);
if (!options.onto)
die(_("Does not point to a valid commit '%s'"),
options.onto_name);
}
if (options.fork_point > 0) {
struct commit *head =
lookup_commit_reference(the_repository,

29
t/t3416-rebase-onto-threedots.sh
View file

@ -129,6 +129,20 @@ test_expect_success 'rebase --keep-base main from topic' '
test_cmp expect actual
'
test_expect_success 'rebase --keep-base main topic from main' '
git checkout main &&
git branch -f topic G &&
git rebase --keep-base main topic &&
git rev-parse C >base.expect &&
git merge-base main HEAD >base.actual &&
test_cmp base.expect base.actual &&
git rev-parse HEAD~2 >actual &&
git rev-parse C^0 >expect &&
test_cmp expect actual
'
test_expect_success 'rebase --keep-base main from side' '
git reset --hard &&
git checkout side &&
@ -153,6 +167,21 @@ test_expect_success 'rebase -i --keep-base main from topic' '
test_cmp expect actual
'
test_expect_success 'rebase -i --keep-base main topic from main' '
git checkout main &&
git branch -f topic G &&
set_fake_editor &&
EXPECT_COUNT=2 git rebase -i --keep-base main topic &&
git rev-parse C >base.expect &&
git merge-base main HEAD >base.actual &&
test_cmp base.expect base.actual &&
git rev-parse HEAD~2 >actual &&
git rev-parse C^0 >expect &&
test_cmp expect actual
'
test_expect_success 'rebase -i --keep-base main from side' '
git reset --hard &&
git checkout side &&