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branch: protect branches checked out in all worktrees 

Refuse to force-move a branch over the currently checked out branch of
any working tree, not just the current one.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Anders Kaseorg 2021-12-01 14:15:47 -08:00 committed by Junio C Hamano
parent 9fdf4f1db4
commit 593a2a5d06
2 changed files with 16 additions and 4 deletions
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13
branch.c
View File

@ -199,7 +199,8 @@ int validate_branchname(const char *name, struct strbuf *ref)
*/
int validate_new_branchname(const char *name, struct strbuf *ref, int force)
{
const char *head;
struct worktree **worktrees;
const struct worktree *wt;
if (!validate_branchname(name, ref))
return 0;
@ -208,9 +209,13 @@ int validate_new_branchname(const char *name, struct strbuf *ref, int force)
die(_("a branch named '%s' already exists"),
ref->buf + strlen("refs/heads/"));
head = resolve_ref_unsafe("HEAD", 0, NULL, NULL);
if (!is_bare_repository() && head && !strcmp(head, ref->buf))
die(_("cannot force update the current branch"));
worktrees = get_worktrees();
wt = find_shared_symref(worktrees, "HEAD", ref->buf);
if (wt && !wt->is_bare)
die(_("cannot force update the branch '%s'"
"checked out at '%s'"),
ref->buf + strlen("refs/heads/"), wt->path);
free_worktrees(worktrees);
return 1;
}

7
t/t3200-branch.sh
View File

@ -168,6 +168,13 @@ test_expect_success 'git branch -M foo bar should fail when bar is checked out'
test_must_fail git branch -M bar foo
'
test_expect_success 'git branch -M foo bar should fail when bar is checked out in worktree' '
git branch -f bar &&
test_when_finished "git worktree remove wt && git branch -D wt" &&
git worktree add wt &&
test_must_fail git branch -M bar wt
'
test_expect_success 'git branch -M baz bam should succeed when baz is checked out' '
git checkout -b baz &&
git branch bam &&