worktree add: improve message for ambiguous remote branch name

When the user runs 'git worktree add ../foo-dir bar-topic' without
specifying a remote, and there is no local branch named bar-topic, we
try to guess which remote branch bar-topic refers to, then create a
new branch named bar-topic that tracks the remote branch.

If multiple remotes have a branch named bar-topic, we silently gave
up, leaving the variable 'branch' intact.  We then entered the
conditional clause 'if (!opts.orphan &&
!lookup_commit_reference_by_name(branch))' and triggered an "invalid
reference" error.  This error message did not provide enough
information to resolve the ambiguity.

When multiple matching branches are found, display a hint and a
descriptive error message and die immediately.

Signed-off-by: Yoichi NAKAYAMA <yoichi.nakayama@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions