When renaming a branch, the current code only updates the current
working tree's HEAD, but it should update .git/HEAD of all checked out
working trees.
This is the current behavior, /path/to/wt's HEAD is not updated:
% git worktree list
/path/to 2c3c5f2 [master]
/path/to/wt 2c3c5f2 [oldname]
% git branch -m master master2
% git worktree list
/path/to 2c3c5f2 [master2]
/path/to/wt 2c3c5f2 [oldname]
% git branch -m oldname newname
% git worktree list
/path/to 2c3c5f2 [master2]
/path/to/wt 0000000 [oldname]
This patch fixes this issue by updating all relevant worktree HEADs
when renaming a branch.
Signed-off-by: Kazuki Yamaguchi <k...@rhe.jp>
---
builtin/branch.c | 4 ++--
t/t3200-branch.sh | 14 +++++++++++++-
worktree.c | 38 ++++++++++++++++++++++++++++++++++++++
worktree.h | 7 +++++++
4 files changed, 60 insertions(+), 3 deletions(-)
diff --git a/builtin/branch.c b/builtin/branch.c
index 7b45b6b..596fb5f 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -20,6 +20,7 @@
#include "utf8.h"
#include "wt-status.h"
#include "ref-filter.h"
+#include "worktree.h"
static const char * const builtin_branch_usage[] = {
N_("git branch [<options>] [-r | -a] [--merged | --no-merged]"),
@@ -552,8 +553,7 @@ static void rename_branch(const char *oldname, const char
*newname, int force)
if (recovery)
warning(_("Renamed a misnamed branch '%s' away"), oldref.buf +
11);
- /* no need to pass logmsg here as HEAD didn't really move */
- if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
+ if (update_worktrees_head_symref(oldref.buf, newref.buf))
die(_("Branch renamed to %s, but HEAD is not updated!"),
newname);
strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index a897248..da107d0 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -126,7 +126,19 @@ test_expect_success 'git branch -M foo bar should fail
when bar is checked out'
test_expect_success 'git branch -M baz bam should succeed when baz is checked
out' '
git checkout -b baz &&
git branch bam &&
- git branch -M baz bam
+ git branch -M baz bam &&
+ test $(git rev-parse --abbrev-ref HEAD) = bam
+'
+
+test_expect_success 'git branch -M baz bam should succeed when baz is checked
out as linked working tree' '
+ git checkout master &&
+ git branch &&
+ git worktree add -b baz bazdir &&
+ git branch -M baz bam &&
+ (
+ cd bazdir &&
+ test $(git rev-parse --abbrev-ref HEAD) = bam
+ )
'
test_expect_success 'git branch -M master should work when master is checked
out' '
diff --git a/worktree.c b/worktree.c
index 6181a66..9e7d0f3 100644
--- a/worktree.c
+++ b/worktree.c
@@ -217,3 +217,41 @@ char *find_shared_symref(const char *symref, const char
*target)
return existing;
}
+
+int update_worktrees_head_symref(const char *oldref, const char *newref)
+{
+ int error = 0;
+ struct strbuf path = STRBUF_INIT;
+ struct strbuf origref = STRBUF_INIT;
+ int i;
+ struct worktree **worktrees = get_worktrees();
+
+ for (i = 0; worktrees[i]; i++) {
+ if (worktrees[i]->is_detached)
+ continue;
+
+ strbuf_reset(&path);
+ strbuf_reset(&origref);
+ strbuf_addf(&path, "%s/HEAD", worktrees[i]->git_dir);
+
+ if (parse_ref(path.buf, &origref, NULL))
+ continue;
+
+ if (!strcmp(origref.buf, oldref)) {
+ int prefix_len =
strlen(absolute_path(get_git_common_dir())) + 1;
+ const char *symref = path.buf + prefix_len;
+
+ /* no need to pass logmsg here as HEAD didn't really
move */
+ if (create_symref(symref, newref, NULL)) {
+ error = -1;
+ break;
+ }
+ }
+ }
+
+ strbuf_release(&path);
+ strbuf_release(&origref);
+ free_worktrees(worktrees);
+
+ return error;
+}
diff --git a/worktree.h b/worktree.h
index b4b3dda..0d15d11 100644
--- a/worktree.h
+++ b/worktree.h
@@ -35,4 +35,11 @@ extern void free_worktrees(struct worktree **);
*/
extern char *find_shared_symref(const char *symref, const char *target);
+/*
+ * Update all per-worktree HEADs pointing the old ref to point the new ref.
+ * This will be used when renaming a branch. Returns 0 if successful,
+ * non-zero otherwise.
+ */
+extern int update_worktrees_head_symref(const char *, const char *);
+
#endif
--
2.8.0.rc3.13.gcd7ec22
--
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