worktree add: emit warn when there is a bad HEAD
Add a warning to `worktree add` when the command tries to reference
HEAD, there exist valid local branches, and the HEAD points to a
non-existent reference.
Current Behavior:
% git -C foo worktree list
/path/to/repo/foo dadc8e6dac [main]
/path/to/repo/foo_wt 0000000000 [badref]
% git -C foo worktree add ../wt1
Preparing worktree (new branch 'wt1')
HEAD is now at dadc8e6dac dummy commit
% git -C foo_wt worktree add ../wt2
hint: If you meant to create a worktree containing a new orphan branch
[...]
hint: Disable this message with "git config advice.worktreeAddOrphan false"
fatal: invalid reference: HEAD
%
New Behavior:
% git -C foo worktree list
/path/to/repo/foo dadc8e6dac [main]
/path/to/repo/foo_wt 0000000000 [badref]
% git -C foo worktree add ../wt1
Preparing worktree (new branch 'wt1')
HEAD is now at dadc8e6dac dummy commit
% git -C foo_wt worktree add ../wt2
warning: HEAD points to an invalid (or orphaned) reference.
HEAD path: '/path/to/repo/foo/.git/worktrees/foo_wt/HEAD'
HEAD contents: 'ref: refs/heads/badref'
hint: If you meant to create a worktree containing a new orphan branch
[...]
hint: Disable this message with "git config advice.worktreeAddOrphan false"
fatal: invalid reference: HEAD
%
Signed-off-by: Jacob Abel <jacobabel@nullpo.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 093b2cb..5f62084 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -638,6 +638,9 @@ static int first_valid_ref(const char *refname,
*
* - Checks whether any valid local branches exist.
*
+ * - Emits a warning if there exist any valid branches but HEAD does not point
+ * to a valid reference.
+ *
* Returns 1 if any of the previous checks are true, otherwise returns 0.
*/
static int can_use_local_refs(const struct add_opts *opts)
@@ -645,6 +648,23 @@ static int can_use_local_refs(const struct add_opts *opts)
if (head_ref(first_valid_ref, NULL)) {
return 1;
} else if (for_each_branch_ref(first_valid_ref, NULL)) {
+ if (!opts->quiet) {
+ struct strbuf path = STRBUF_INIT;
+ struct strbuf contents = STRBUF_INIT;
+
+ strbuf_add_real_path(&path, get_worktree_git_dir(NULL));
+ strbuf_addstr(&path, "/HEAD");
+ strbuf_read_file(&contents, path.buf, 64);
+ strbuf_stripspace(&contents, 0);
+ strbuf_strip_suffix(&contents, "\n");
+
+ warning(_("HEAD points to an invalid (or orphaned) reference.\n"
+ "HEAD path: '%s'\n"
+ "HEAD contents: '%s'"),
+ path.buf, contents.buf);
+ strbuf_release(&path);
+ strbuf_release(&contents);
+ }
return 1;
}
return 0;
@@ -666,16 +686,12 @@ static int can_use_local_refs(const struct add_opts *opts)
static int can_use_remote_refs(const struct add_opts *opts)
{
if (!guess_remote) {
- if (!opts->quiet)
- fprintf_ln(stderr, WORKTREE_ADD_DWIM_ORPHAN_INFER_TEXT);
return 0;
} else if (for_each_remote_ref(first_valid_ref, NULL)) {
return 1;
} else if (!opts->force && remote_get(NULL)) {
die(_("No local or remote refs exist despite at least one remote\n"
"present, stopping; use 'add -f' to overide or fetch a remote first"));
- } else if (!opts->quiet) {
- fprintf_ln(stderr, WORKTREE_ADD_DWIM_ORPHAN_INFER_TEXT);
}
return 0;
}
@@ -828,8 +844,12 @@ static int add(int ac, const char **av, const char *prefix)
int n;
const char *s = worktree_basename(path, &n);
new_branch = xstrndup(s, n);
- } else if (opts.orphan || opts.detach) {
+ } else if (opts.orphan) {
// No-op
+ } else if (opts.detach) {
+ // Check HEAD
+ if (!strcmp(branch, "HEAD"))
+ can_use_local_refs(&opts);
} else if (ac < 2 && new_branch) {
// DWIM: Infer --orphan when repo has no refs.
opts.orphan = dwim_orphan(&opts, !!opt_track, 0);
@@ -854,6 +874,10 @@ static int add(int ac, const char **av, const char *prefix)
branch = remote;
}
}
+
+ if (!strcmp(branch, "HEAD"))
+ can_use_local_refs(&opts);
+
}
if (!opts.orphan && !lookup_commit_reference_by_name(branch)) {
