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init: make --separate-git-dir work from within linked worktree

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The intention of `git init --separate-work-dir=<path>` is to move the
.git/ directory to a location outside of the main worktree. When used
within a linked worktree, however, rather than moving the .git/
directory as intended, it instead incorrectly moves the worktree's
.git/worktrees/<id> directory to <path>, thus disconnecting the linked
worktree from its parent repository and breaking the worktree in the
process since its local .git file no longer points at a location at
which it can find the object database. Fix this broken behavior.

An intentional side-effect of this change is that it also closes a
loophole not caught by ccf236a23a (init: disallow --separate-git-dir
with bare repository, 2020-08-09) in which the check to prevent
--separate-git-dir being used in conjunction with a bare repository was
unable to detect the invalid combination when invoked from within a
linked worktree. Therefore, add a test to verify that this loophole is
closed, as well.

Reported-by: Henré Botha <henrebotha@gmail.com>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2020-08-31 02:58:00 -04:00 committed by Junio C Hamano
parent 42264bc841
commit 59d876ccd6
2 changed files with 43 additions and 2 deletions
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24
builtin/init-db.c
View file

@ -642,6 +642,30 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
if (!git_dir)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
/*
* When --separate-git-dir is used inside a linked worktree, take
* care to ensure that the common .git/ directory is relocated, not
* the worktree-specific .git/worktrees/<id>/ directory.
*/
if (real_git_dir) {
int err;
const char *p;
struct strbuf sb = STRBUF_INIT;
p = read_gitfile_gently(git_dir, &err);
if (p && get_common_dir(&sb, p)) {
struct strbuf mainwt = STRBUF_INIT;
strbuf_addbuf(&mainwt, &sb);
strbuf_strip_suffix(&mainwt, "/.git");
if (chdir(mainwt.buf) < 0)
die_errno(_("cannot chdir to %s"), mainwt.buf);
strbuf_release(&mainwt);
git_dir = strbuf_detach(&sb, NULL);
}
strbuf_release(&sb);
}
if (is_bare_repository_cfg < 0)
is_bare_repository_cfg = guess_repository_type(git_dir);

21
t/t0001-init.sh
View file

@ -329,6 +329,15 @@ test_expect_success 'implicit bare & --separate-git-dir incompatible' '
test_i18ngrep "incompatible" err
'
test_expect_success 'bare & --separate-git-dir incompatible within worktree' '
test_when_finished "rm -rf bare.git linkwt seprepo" &&
test_commit gumby &&
git clone --bare . bare.git &&
git -C bare.git worktree add --detach ../linkwt &&
test_must_fail git -C linkwt init --separate-git-dir seprepo 2>err &&
test_i18ngrep "incompatible" err
'
test_lazy_prereq GETCWD_IGNORES_PERMS '
base=GETCWD_TEST_BASE_DIR &&
mkdir -p $base/dir &&
@ -405,15 +414,23 @@ test_expect_success SYMLINKS 're-init to move gitdir symlink' '
test_path_is_dir realgitdir/refs
'
test_expect_success 're-init to move gitdir with linked worktrees' '
sep_git_dir_worktree () {
test_when_finished "rm -rf mainwt linkwt seprepo" &&
git init mainwt &&
test_commit -C mainwt gumby &&
git -C mainwt worktree add --detach ../linkwt &&
git -C mainwt init --separate-git-dir ../seprepo &&
git -C "$1" init --separate-git-dir ../seprepo &&
git -C mainwt rev-parse --git-common-dir >expect &&
git -C linkwt rev-parse --git-common-dir >actual &&
test_cmp expect actual
}
test_expect_success 're-init to move gitdir with linked worktrees' '
sep_git_dir_worktree mainwt
'
test_expect_success 're-init to move gitdir within linked worktree' '
sep_git_dir_worktree linkwt
'
test_expect_success MINGW '.git hidden' '