Merge branch 'mh/split-under-lock'

Further preparatory work on the refs API before the pluggable
backend series can land.

* mh/split-under-lock: (33 commits)
  lock_ref_sha1_basic(): only handle REF_NODEREF mode
  commit_ref_update(): remove the flags parameter
  lock_ref_for_update(): don't resolve symrefs
  lock_ref_for_update(): don't re-read non-symbolic references
  refs: resolve symbolic refs first
  ref_transaction_update(): check refname_is_safe() at a minimum
  unlock_ref(): move definition higher in the file
  lock_ref_for_update(): new function
  add_update(): initialize the whole ref_update
  verify_refname_available(): adjust constness in declaration
  refs: don't dereference on rename
  refs: allow log-only updates
  delete_branches(): use resolve_refdup()
  ref_transaction_commit(): correctly report close_ref() failure
  ref_transaction_create(): disallow recursive pruning
  refs: make error messages more consistent
  lock_ref_sha1_basic(): remove unneeded local variable
  read_raw_ref(): move docstring to header file
  read_raw_ref(): improve docstring
  read_raw_ref(): rename symref argument to referent
  ...

1 files changed, 9 insertions, 0 deletions

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index ac9c764799..8a833f354e 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -79,6 +79,15 @@ test_expect_success 'git branch -m dumps usage' '
 	test_i18ngrep "branch name required" err
 '
 
+test_expect_success 'git branch -m m broken_symref should work' '
+	test_when_finished "git branch -D broken_symref" &&
+	git branch -l m &&
+	git symbolic-ref refs/heads/broken_symref refs/heads/i_am_broken &&
+	git branch -m m broken_symref &&
+	git reflog exists refs/heads/broken_symref &&
+	test_must_fail git reflog exists refs/heads/i_am_broken
+'
+
 test_expect_success 'git branch -m m m/m should work' '
 	git branch -l m &&
 	git branch -m m m/m &&