Before creating NOTES_MERGE_REF, check NOTES_MERGE_REF using
find_shared_symref and die if we find one. This prevents simultaneous
merges to the same notes branch from different worktrees.
Signed-off-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
---
builtin/notes.c | 5 +++
t/t3320-notes-merge-worktrees.sh | 72 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
create mode 100755 t/t3320-notes-merge-worktrees.sh
diff --git a/builtin/notes.c b/builtin/notes.c
index 63f95fc..e4dda79 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -19,6 +19,7 @@
#include "string-list.h"
#include "notes-merge.h"
#include "notes-utils.h"
+#include "branch.h"
static const char * const git_notes_usage[] = {
N_("git notes [--ref <notes-ref>] [list [<object>]]"),
@@ -825,10 +826,14 @@ static int merge(int argc, const char **argv, const char *prefix)
update_ref(msg.buf, default_notes_ref(), result_sha1, NULL,
0, UPDATE_REFS_DIE_ON_ERR);
else { /* Merge has unresolved conflicts */
+ char *existing;
/* Update .git/NOTES_MERGE_PARTIAL with partial merge result */
update_ref(msg.buf, "NOTES_MERGE_PARTIAL", result_sha1, NULL,
0, UPDATE_REFS_DIE_ON_ERR);
/* Store ref-to-be-updated into .git/NOTES_MERGE_REF */
+ existing = find_shared_symref("NOTES_MERGE_REF", default_notes_ref());
+ if (existing)
+ die(_("A notes merge on %s is already in-progress for %s"), default_notes_ref(), existing);
if (create_symref("NOTES_MERGE_REF", default_notes_ref(), NULL))
die("Failed to store link to current notes ref (%s)",
default_notes_ref());
diff --git a/t/t3320-notes-merge-worktrees.sh b/t/t3320-notes-merge-worktrees.sh
new file mode 100755
index 0000000..997621f
--- /dev/null
+++ b/t/t3320-notes-merge-worktrees.sh
@@ -0,0 +1,72 @@
+#!/bin/sh
+#
+# Copyright (c) 2015 Twitter, Inc
+#
+
+test_description='Test merging of notes trees in multiple worktrees'
+
+. ./test-lib.sh
+
+test_expect_success 'setup commit' '
+ test_commit tantrum
+'
+
+commit_tantrum=$(git rev-parse tantrum^{commit})
+
+test_expect_success 'setup notes ref (x)' '
+ git config core.notesRef refs/notes/x &&
+ git notes add -m "x notes on tantrum" tantrum
+'
+
+test_expect_success 'setup local branch (y)' '
+ git update-ref refs/notes/y refs/notes/x &&
+ git config core.notesRef refs/notes/y &&
+ git notes remove tantrum
+'
+
+test_expect_success 'setup remote branch (z)' '
+ git update-ref refs/notes/z refs/notes/x &&
+ git config core.notesRef refs/notes/z &&
+ git notes add -f -m "conflicting notes on tantrum" tantrum
+'
+
+test_expect_success 'modify notes ref ourselves (x)' '
+ git config core.notesRef refs/notes/x &&
+ git notes add -f -m "more conflicting notes on tantrum" tantrum
+'
+
+test_expect_success 'create some new worktrees' '
+ git worktree add -b newbranch worktree master &&
+ git worktree add -b newbranch2 worktree2 master
+'
+
+test_expect_success 'merge z into y fails and sets NOTES_MERGE_REF' '
+ git config core.notesRef refs/notes/y &&
+ test_must_fail git notes merge z &&
+ echo "ref: refs/notes/y" > expect &&
+ test_cmp .git/NOTES_MERGE_REF expect
+'
+
+test_expect_success 'merge z into y while mid-merge in another workdir fails' '
+ (
+ cd worktree &&
+ git config core.notesRef refs/notes/y &&
+ test_must_fail git notes merge z 2>err &&
+ grep "A notes merge on refs/notes/y is already in-progress for" err
+ ) &&
+ test_path_is_missing .git/worktrees/worktree/NOTES_MERGE_REF
+'
+
+test_expect_success 'merge z into x while mid-merge on y succeeds' '
+ (
+ cd worktree2 &&
+ git config core.notesRef refs/notes/x &&
+ test_must_fail git notes merge z 2>&1 >out &&
+ grep "Automatic notes merge failed" out
+ grep -v "A notes merge on refs/notes/x is already in-progress for" out
+ ) &&
+ echo "ref: refs/notes/x" > expect &&
+ test_cmp .git/worktrees/worktree2/NOTES_MERGE_REF expect
+'
+
+test_done
--
2.0.4.315.gad8727a-twtrsrc
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