Prevent merges to the same notes branch from different worktrees.
Before creating NOTES_MERGE_REF, check NOTES_MERGE_REF using the same
code we use to check that two HEADs in different worktrees don't point
to the same branch. Modify that code, die_if_checked_out, to take a
"head" ref to examine; previously, it just looked at HEAD.
Reported-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: David Turner <dtur...@twopensource.com>
---
branch.c | 15 +++++----
branch.h | 2 +-
builtin/checkout.c | 2 +-
builtin/notes.c | 2 ++
builtin/worktree.c | 2 +-
t/t3320-notes-merge-worktrees.sh | 71 ++++++++++++++++++++++++++++++++++++++++
6 files changed, 84 insertions(+), 10 deletions(-)
create mode 100755 t/t3320-notes-merge-worktrees.sh
diff --git a/branch.c b/branch.c
index c85be07..60eadc6 100644
--- a/branch.c
+++ b/branch.c
@@ -311,21 +311,22 @@ void remove_branch_state(void)
unlink(git_path("SQUASH_MSG"));
}
-static void check_linked_checkout(const char *branch, const char *id)
+static void check_linked_checkout(const char *head, const char *branch,
+ const char *id)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
struct strbuf gitdir = STRBUF_INIT;
/*
- * $GIT_COMMON_DIR/HEAD is practically outside
+ * $GIT_COMMON_DIR/$head is practically outside
* $GIT_DIR so resolve_ref_unsafe() won't work (it
* uses git_path). Parse the ref ourselves.
*/
if (id)
- strbuf_addf(&path, "%s/worktrees/%s/HEAD",
get_git_common_dir(), id);
+ strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(),
id, head);
else
- strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
+ strbuf_addf(&path, "%s/%s", get_git_common_dir(), head);
if (!strbuf_readlink(&sb, path.buf, 0)) {
if (!starts_with(sb.buf, "refs/") ||
@@ -356,13 +357,13 @@ done:
strbuf_release(&gitdir);
}
-void die_if_checked_out(const char *branch)
+void die_if_checked_out(const char *head, const char *branch)
{
struct strbuf path = STRBUF_INIT;
DIR *dir;
struct dirent *d;
- check_linked_checkout(branch, NULL);
+ check_linked_checkout(head, branch, NULL);
strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
dir = opendir(path.buf);
@@ -373,7 +374,7 @@ void die_if_checked_out(const char *branch)
while ((d = readdir(dir)) != NULL) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
- check_linked_checkout(branch, d->d_name);
+ check_linked_checkout(head, branch, d->d_name);
}
closedir(dir);
}
diff --git a/branch.h b/branch.h
index 58aa45f..3577fe5 100644
--- a/branch.h
+++ b/branch.h
@@ -57,6 +57,6 @@ extern int read_branch_desc(struct strbuf *, const char
*branch_name);
* worktree and die (with a message describing its checkout location) if
* it is.
*/
-extern void die_if_checked_out(const char *branch);
+extern void die_if_checked_out(const char *head, const char *branch);
#endif
diff --git a/builtin/checkout.c b/builtin/checkout.c
index e1403be..a5e9f2d 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1107,7 +1107,7 @@ static int checkout_branch(struct checkout_opts *opts,
char *head_ref = resolve_refdup("HEAD", 0, sha1, &flag);
if (head_ref &&
(!(flag & REF_ISSYMREF) || strcmp(head_ref, new->path)))
- die_if_checked_out(new->path);
+ die_if_checked_out("HEAD", new->path);
free(head_ref);
}
diff --git a/builtin/notes.c b/builtin/notes.c
index 63f95fc..8794ba1 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>]]"),
@@ -829,6 +830,7 @@ static int merge(int argc, const char **argv, const char
*prefix)
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 */
+ die_if_checked_out("NOTES_MERGE_REF", default_notes_ref());
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/builtin/worktree.c b/builtin/worktree.c
index 430b51e..bfdb90f 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -203,7 +203,7 @@ static int add_worktree(const char *path, const char
*refname,
else if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
ref_exists(symref.buf)) { /* it's a branch */
if (!opts->force)
- die_if_checked_out(symref.buf);
+ die_if_checked_out("HEAD", symref.buf);
} else { /* must be a commit */
commit = lookup_commit_reference_by_name(refname);
if (!commit)
diff --git a/t/t3320-notes-merge-worktrees.sh b/t/t3320-notes-merge-worktrees.sh
new file mode 100755
index 0000000..b102c23
--- /dev/null
+++ b/t/t3320-notes-merge-worktrees.sh
@@ -0,0 +1,71 @@
+#!/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 "is already checked out" 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 -v "is already checked out" 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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