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rebase: refuse to switch to branch already checked out elsewhere

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The invocation "git rebase <upstream> <branch>" switches to <branch>
before performing the rebase operation. However, unlike git-switch,
git-checkout, and git-worktree which all refuse to switch to a branch
that is already checked out in some other worktree, git-rebase switches
to <branch> unconditionally. Curb this careless behavior by making
git-rebase also refuse to switch to a branch checked out elsewhere.

Reported-by: Mike Hommey <mh@glandium.org>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2020-02-23 05:14:07 -05:00 committed by Junio C Hamano
parent df126ca142
commit b5cabb4a96
2 changed files with 21 additions and 2 deletions
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5
builtin/rebase.c
View file

@ -1953,10 +1953,11 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
/* Is it a local branch? */
strbuf_reset(&buf);
strbuf_addf(&buf, "refs/heads/%s", branch_name);
if (!read_ref(buf.buf, &options.orig_head))
if (!read_ref(buf.buf, &options.orig_head)) {
die_if_checked_out(buf.buf, 1);
options.head_name = xstrdup(buf.buf);
/* If not is it a valid ref (branch or commit)? */
else if (!get_oid(branch_name, &options.orig_head))
} else if (!get_oid(branch_name, &options.orig_head))
options.head_name = NULL;
else
die(_("fatal: no such branch/commit '%s'"),

18
t/t3400-rebase.sh
View file

@ -377,4 +377,22 @@ test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
test_must_be_empty err
'
test_expect_success 'switch to branch checked out here' '
git checkout master &&
git rebase master master
'
test_expect_success 'switch to branch not checked out' '
git checkout master &&
git branch other &&
git rebase master other
'
test_expect_success 'refuse to switch to branch checked out elsewhere' '
git checkout master &&
git worktree add wt &&
test_must_fail git -C wt rebase master master 2>err &&
test_i18ngrep "already checked out" err
'
test_done