Merge branch 'rj/avoid-switching-to-already-used-branch'

A few subcommands have been taught to stop users from working on a
branch that is being used in another worktree linked to the same
repository.

* rj/avoid-switching-to-already-used-branch:
  switch: reject if the branch is already checked out elsewhere (test)
  rebase: refuse to switch to a branch already checked out elsewhere (test)
  branch: fix die_if_checked_out() when ignore_current_worktree
  worktree: introduce is_shared_symref()

1 files changed, 6 insertions, 0 deletions

diff --git a/worktree.h b/worktree.h
index 2baeca2a8a..ce45b66de9 100644
--- a/worktree.h
+++ b/worktree.h
@@ -149,6 +149,12 @@ const struct worktree *find_shared_symref(struct worktree **worktrees,
 					  const char *target);
 
 /*
+ * Returns true if a symref points to a ref in a worktree.
+ */
+int is_shared_symref(const struct worktree *wt,
+		     const char *symref, const char *target);
+
+/*
  * Similar to head_ref() for all HEADs _except_ one from the current
  * worktree, which is covered by head_ref().
  */