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worktree remove: new command

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This command allows to delete a worktree. Like 'move' you cannot
remove the main worktree, or one with submodules inside [1].

For deleting $GIT_WORK_TREE, Untracked files or any staged entries are
considered precious and therefore prevent removal by default. Ignored
files are not precious.

When it comes to deleting $GIT_DIR, there's no "clean" check because
there should not be any valuable data in there, except:

- HEAD reflog. There is nothing we can do about this until somebody
  steps up and implements the ref graveyard.

- Detached HEAD. Technically it can still be recovered. Although it
  may be nice to warn about orphan commits like 'git checkout' does.

[1] We do 'git status' with --ignore-submodules=all for safety
    anyway. But this needs a closer look by submodule people before we
    can allow deletion. For example, if a submodule is totally clean,
    but its repo not absorbed to the main .git dir, then deleting
    worktree also deletes the valuable .submodule repo too.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2018-02-12 16:49:39 +07:00
committed by Junio C Hamano
parent 78d986b252
commit cc73385cf6
4 changed files with 179 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

134
builtin/worktree.c
View File

@ -19,6 +19,7 @@ static const char * const worktree_usage[] = {
N_("git worktree lock [<options>] <path>"),
N_("git worktree move <worktree> <new-path>"),
N_("git worktree prune [<options>]"),
N_("git worktree remove [<options>] <worktree>"),
N_("git worktree unlock <path>"),
NULL
};
@ -624,7 +625,7 @@ static void validate_no_submodules(const struct worktree *wt)
discard_index(&istate);
if (found_submodules)
die(_("working trees containing submodules cannot be moved"));
die(_("working trees containing submodules cannot be moved or removed"));
}
static int move_worktree(int ac, const char **av, const char *prefix)
@ -688,6 +689,135 @@ static int move_worktree(int ac, const char **av, const char *prefix)
return 0;
}
/*
* Note, "git status --porcelain" is used to determine if it's safe to
* delete a whole worktree. "git status" does not ignore user
* configuration, so if a normal "git status" shows "clean" for the
* user, then it's ok to remove it.
*
* This assumption may be a bad one. We may want to ignore
* (potentially bad) user settings and only delete a worktree when
* it's absolutely safe to do so from _our_ point of view because we
* know better.
*/
static void check_clean_worktree(struct worktree *wt,
const char *original_path)
{
struct argv_array child_env = ARGV_ARRAY_INIT;
struct child_process cp;
char buf[1];
int ret;
/*
* Until we sort this out, all submodules are "dirty" and
* will abort this function.
*/
validate_no_submodules(wt);
argv_array_pushf(&child_env, "%s=%s/.git",
GIT_DIR_ENVIRONMENT, wt->path);
argv_array_pushf(&child_env, "%s=%s",
GIT_WORK_TREE_ENVIRONMENT, wt->path);
memset(&cp, 0, sizeof(cp));
argv_array_pushl(&cp.args, "status",
"--porcelain", "--ignore-submodules=none",
NULL);
cp.env = child_env.argv;
cp.git_cmd = 1;
cp.dir = wt->path;
cp.out = -1;
ret = start_command(&cp);
if (ret)
die_errno(_("failed to run 'git status' on '%s'"),
original_path);
ret = xread(cp.out, buf, sizeof(buf));
if (ret)
die(_("'%s' is dirty, use --force to delete it"),
original_path);
close(cp.out);
ret = finish_command(&cp);
if (ret)
die_errno(_("failed to run 'git status' on '%s', code %d"),
original_path, ret);
}
static int delete_git_work_tree(struct worktree *wt)
{
struct strbuf sb = STRBUF_INIT;
int ret = 0;
strbuf_addstr(&sb, wt->path);
if (remove_dir_recursively(&sb, 0)) {
error_errno(_("failed to delete '%s'"), sb.buf);
ret = -1;
}
strbuf_release(&sb);
return ret;
}
static int delete_git_dir(struct worktree *wt)
{
struct strbuf sb = STRBUF_INIT;
int ret = 0;
strbuf_addstr(&sb, git_common_path("worktrees/%s", wt->id));
if (remove_dir_recursively(&sb, 0)) {
error_errno(_("failed to delete '%s'"), sb.buf);
ret = -1;
}
strbuf_release(&sb);
return ret;
}
static int remove_worktree(int ac, const char **av, const char *prefix)
{
int force = 0;
struct option options[] = {
OPT_BOOL(0, "force", &force,
N_("force removing even if the worktree is dirty")),
OPT_END()
};
struct worktree **worktrees, *wt;
struct strbuf errmsg = STRBUF_INIT;
const char *reason;
int ret = 0;
ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
if (ac != 1)
usage_with_options(worktree_usage, options);
worktrees = get_worktrees(0);
wt = find_worktree(worktrees, prefix, av[0]);
if (!wt)
die(_("'%s' is not a working tree"), av[0]);
if (is_main_worktree(wt))
die(_("'%s' is a main working tree"), av[0]);
reason = is_worktree_locked(wt);
if (reason) {
if (*reason)
die(_("cannot remove a locked working tree, lock reason: %s"),
reason);
die(_("cannot remove a locked working tree"));
}
if (validate_worktree(wt, &errmsg))
die(_("validation failed, cannot remove working tree: %s"),
errmsg.buf);
strbuf_release(&errmsg);
if (!force)
check_clean_worktree(wt, av[0]);
ret |= delete_git_work_tree(wt);
/*
* continue on even if ret is non-zero, there's no going back
* from here.
*/
ret |= delete_git_dir(wt);
free_worktrees(worktrees);
return ret;
}
int cmd_worktree(int ac, const char **av, const char *prefix)
{
struct option options[] = {
@ -712,5 +842,7 @@ int cmd_worktree(int ac, const char **av, const char *prefix)
return unlock_worktree(ac - 1, av + 1, prefix);
if (!strcmp(av[1], "move"))
return move_worktree(ac - 1, av + 1, prefix);
if (!strcmp(av[1], "remove"))
return remove_worktree(ac - 1, av + 1, prefix);
usage_with_options(worktree_usage, options);
}