checkout: don't require a work tree when checking out into a new one

For normal use cases, it does not make sense for 'checkout' to work on a bare repository, without a worktree. But "checkout --to" is an exception because it _creates_ a new worktree. Allow this option to run on bare repositories. People who check out from a bare repository should remember that core.logallrefupdates is off by default and it should be turned back on. `--to` cannot do this automatically behind the user's back because some user may deliberately want no reflog. For people interested in repository setup/discovery code, is_bare_repository_cfg (aka "core.bare") is unchanged by this patch, which means 'true' by default for bare repos. Fortunately when we get the repo through a linked checkout, is_bare_repository_cfg is never used. So all is still good. [nd: commit message] Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Dennis Kaarsemaker committed Nov 30, 2014 at 15:24 UTC 3473ad0cf6c90917813aba978dada6c10352baaa
3 files changed +19 -1
builtin/checkout.c
+3
@@ -1364,6 +1364,9 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
1364 if (opts.new_worktree_mode)
1365 opts.new_worktree = NULL;
1366
1367 + if (!opts.new_worktree)
1368 + setup_work_tree();
1369 +
1370 if (conflict_style) {
1371 opts.merge = 1; /* implied */
1372 git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
git.c
+1 -1
@@ -383,7 +383,7 @@ static struct cmd_struct commands[] = {
383 { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
384 { "check-mailmap", cmd_check_mailmap, RUN_SETUP },
385 { "check-ref-format", cmd_check_ref_format },
386 - { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
386 + { "checkout", cmd_checkout, RUN_SETUP },
387 { "checkout-index", cmd_checkout_index,
388 RUN_SETUP | NEED_WORK_TREE},
389 { "cherry", cmd_cherry, RUN_SETUP },
t/t2025-checkout-to.sh
+15
@@ -81,4 +81,19 @@ test_expect_success 'not die on re-checking out current branch' '
81 )
82 '
83
84 +test_expect_success 'checkout --to from a bare repo' '
85 + (
86 + git clone --bare . bare &&
87 + cd bare &&
88 + git checkout --to ../there2 -b bare-master master
89 + )
90 +'
91 +
92 +test_expect_success 'checkout from a bare repo without --to' '
93 + (
94 + cd bare &&
95 + test_must_fail git checkout master
96 + )
97 +'
98 +
99 test_done