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wt-status: tolerate dangling marks

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When a user checks out the upstream branch of HEAD, the upstream branch
not being a local branch, and then runs "git status", like this:

  git clone $URL client
  cd client
  git checkout @{u}
  git status

no status is printed, but instead an error message:

  fatal: HEAD does not point to a branch

(This error message when running "git branch" persists even after
checking out other things - it only stops after checking out a branch.)

This is because "git status" reads the reflog when determining the "HEAD
detached" message, and thus attempts to DWIM "@{u}", but that doesn't
work because HEAD no longer points to a branch.

Therefore, when calculating the status of a worktree, tolerate dangling
marks. This is done by adding an additional parameter to
dwim_ref() and repo_dwim_ref().

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2020-09-01 15:28:09 -07:00
committed by Junio C Hamano
parent ec06b05568
commit f24c30e0b6
19 changed files with 60 additions and 29 deletions
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4
builtin/checkout.c
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@ -650,7 +650,7 @@ static void setup_branch_path(struct branch_info *branch)
* If this is a ref, resolve it; otherwise, look up the OID for our
* expression. Failure here is okay.
*/
if (!dwim_ref(branch->name, strlen(branch->name), &branch->oid, &branch->refname))
if (!dwim_ref(branch->name, strlen(branch->name), &branch->oid, &branch->refname, 0))
repo_get_oid_committish(the_repository, branch->name, &branch->oid);
strbuf_branchname(&buf, branch->name, INTERPRET_BRANCH_LOCAL);
@ -1349,7 +1349,7 @@ static void die_expecting_a_branch(const struct branch_info *branch_info)
struct object_id oid;
char *to_free;
if (dwim_ref(branch_info->name, strlen(branch_info->name), &oid, &to_free) == 1) {
if (dwim_ref(branch_info->name, strlen(branch_info->name), &oid, &to_free, 0) == 1) {
const char *ref = to_free;
if (skip_prefix(ref, "refs/tags/", &ref))