SYNOPSIS
--------
[verse]
-'git-branch' [-r] [-a] [-v] [--abbrev=<length>]
+'git-branch' [-r | -a] [-v [--abbrev=<length>]]
'git-branch' [-l] [-f] <branchname> [<start-point>]
+'git-branch' (-m | -M) [<oldbranch>] <newbranch>
'git-branch' (-d | -D) <branchname>...
DESCRIPTION
If no <start-point> is given, the branch will be created with a head
equal to that of the currently checked out branch.
+With a '-m' or '-M' option, <oldbranch> will be renamed to <newbranch>.
+If <oldbranch> had a corresponding reflog, it is renamed to match
+<newbranch>, and a reflog entry is created to remember the branch
+renaming. If <newbranch> exists, -M must be used to force the rename
+to happen.
+
With a `-d` or `-D` option, `<branchname>` will be deleted. You may
specify more than one branch for deletion. If the branch currently
has a ref log then the ref log will also be deleted.
Force the creation of a new branch even if it means deleting
a branch that already exists with the same name.
+-m::
+ Move/rename a branch and the corresponding reflog.
+
+-M::
+ Move/rename a branch even if the new branchname already exists.
+
-r::
List the remote-tracking branches.
List both remote-tracking branches and local branches.
-v::
- Show sha1 and subject message for each head.
+ Show sha1 and commit subjectline for each head.
--abbrev=<length>::
Alter minimum display length for sha1 in output listing,
be given as a branch name, a commit-id, or a tag. If this option
is omitted, the current branch is assumed.
+<oldbranch>::
+ The name of an existing branch to rename.
+
+<newbranch>::
+ The new name for an existing branch. The same restrictions as for
+ <branchname> applies.
Examples
#include "builtin.h"
static const char builtin_branch_usage[] =
-"git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | [-r | -a] [-v] [--abbrev=<length>] ";
+ "git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [-r | -a] [-v [--abbrev=<length>]]";
static const char *head;
die("Failed to write ref: %s.", strerror(errno));
}
+static void rename_branch(const char *oldname, const char *newname, int force)
+{
+ char oldref[PATH_MAX], newref[PATH_MAX];
+ unsigned char sha1[20];
+
+ if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
+ die("Old branchname too long");
+
+ if (check_ref_format(oldref))
+ die("Invalid branch name: %s", oldref);
+
+ if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
+ die("New branchname too long");
+
+ if (check_ref_format(newref))
+ die("Invalid branch name: %s", newref);
+
+ if (resolve_ref(newref, sha1, 1, NULL) && !force)
+ die("A branch named '%s' already exists.", newname);
+
+ if (rename_ref(oldref, newref))
+ die("Branch rename failed");
+
+ if (!strcmp(oldname, head) && create_symref("HEAD", newref))
+ die("Branch renamed to %s, but HEAD is not updated!", newname);
+}
+
int cmd_branch(int argc, const char **argv, const char *prefix)
{
int delete = 0, force_delete = 0, force_create = 0;
+ int rename = 0, force_rename = 0;
int verbose = 0, abbrev = DEFAULT_ABBREV;
int reflog = 0;
int kinds = REF_LOCAL_BRANCH;
force_create = 1;
continue;
}
+ if (!strcmp(arg, "-m")) {
+ rename = 1;
+ continue;
+ }
+ if (!strcmp(arg, "-M")) {
+ rename = 1;
+ force_rename = 1;
+ continue;
+ }
if (!strcmp(arg, "-r")) {
kinds = REF_REMOTE_BRANCH;
continue;
usage(builtin_branch_usage);
}
+ if ((delete && rename) || (delete && force_create) ||
+ (rename && force_create))
+ usage(builtin_branch_usage);
+
head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
if (!head)
die("Failed to resolve HEAD as a valid ref.");
delete_branches(argc - i, argv + i, force_delete);
else if (i == argc)
print_ref_list(kinds, verbose, abbrev);
+ else if (rename && (i == argc - 1))
+ rename_branch(head, argv[i], force_rename);
+ else if (rename && (i == argc - 2))
+ rename_branch(argv[i], argv[i + 1], force_rename);
else if (i == argc - 1)
create_branch(argv[i], head, force_create, reflog);
else if (i == argc - 2)
return remove_empty_dir_recursive(path, len);
}
+static int is_refname_available(const char *ref, const char *oldref,
+ struct ref_list *list, int quiet)
+{
+ int namlen = strlen(ref); /* e.g. 'foo/bar' */
+ while (list) {
+ /* list->name could be 'foo' or 'foo/bar/baz' */
+ if (!oldref || strcmp(oldref, list->name)) {
+ int len = strlen(list->name);
+ int cmplen = (namlen < len) ? namlen : len;
+ const char *lead = (namlen < len) ? list->name : ref;
+ if (!strncmp(ref, list->name, cmplen) &&
+ lead[cmplen] == '/') {
+ if (!quiet)
+ error("'%s' exists; cannot create '%s'",
+ list->name, ref);
+ return 0;
+ }
+ }
+ list = list->next;
+ }
+ return 1;
+}
+
static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
{
char *ref_file;
orig_ref, strerror(errno));
goto error_return;
}
- if (is_null_sha1(lock->old_sha1)) {
- /* The ref did not exist and we are creating it.
- * Make sure there is no existing ref that is packed
- * whose name begins with our refname, nor a ref whose
- * name is a proper prefix of our refname.
- */
- int namlen = strlen(ref); /* e.g. 'foo/bar' */
- struct ref_list *list = get_packed_refs();
- while (list) {
- /* list->name could be 'foo' or 'foo/bar/baz' */
- int len = strlen(list->name);
- int cmplen = (namlen < len) ? namlen : len;
- const char *lead = (namlen < len) ? list->name : ref;
-
- if (!strncmp(ref, list->name, cmplen) &&
- lead[cmplen] == '/') {
- error("'%s' exists; cannot create '%s'",
- list->name, ref);
- goto error_return;
- }
- list = list->next;
- }
- }
+ /* When the ref did not exist and we are creating it,
+ * make sure there is no existing ref that is packed
+ * whose name begins with our refname, nor a ref whose
+ * name is a proper prefix of our refname.
+ */
+ if (is_null_sha1(lock->old_sha1) &&
+ !is_refname_available(ref, NULL, get_packed_refs(), 0))
+ goto error_return;
lock->lk = xcalloc(1, sizeof(struct lock_file));
return ret;
}
+int rename_ref(const char *oldref, const char *newref)
+{
+ static const char renamed_ref[] = "RENAMED-REF";
+ unsigned char sha1[20], orig_sha1[20];
+ int flag = 0, logmoved = 0;
+ struct ref_lock *lock;
+ char msg[PATH_MAX*2 + 100];
+ struct stat loginfo;
+ int log = !stat(git_path("logs/%s", oldref), &loginfo);
+
+ if (S_ISLNK(loginfo.st_mode))
+ return error("reflog for %s is a symlink", oldref);
+
+ if (!resolve_ref(oldref, orig_sha1, 1, &flag))
+ return error("refname %s not found", oldref);
+
+ if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
+ return 1;
+
+ if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
+ return 1;
+
+ if (snprintf(msg, sizeof(msg), "renamed %s to %s", oldref, newref) > sizeof(msg))
+ return error("Refnames to long");
+
+ lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
+ if (!lock)
+ return error("unable to lock %s", renamed_ref);
+ lock->force_write = 1;
+ if (write_ref_sha1(lock, orig_sha1, msg))
+ return error("unable to save current sha1 in %s", renamed_ref);
+
+ if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
+ return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
+ oldref, strerror(errno));
+
+ if (delete_ref(oldref, orig_sha1)) {
+ error("unable to delete old %s", oldref);
+ goto rollback;
+ }
+
+ if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
+ if (errno==EISDIR) {
+ if (remove_empty_directories(git_path("%s", newref))) {
+ error("Directory not empty: %s", newref);
+ goto rollback;
+ }
+ } else {
+ error("unable to delete existing %s", newref);
+ goto rollback;
+ }
+ }
+
+ if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
+ error("unable to create directory for %s", newref);
+ goto rollback;
+ }
+
+ retry:
+ if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
+ if (errno==EISDIR) {
+ if (remove_empty_directories(git_path("logs/%s", newref))) {
+ error("Directory not empty: logs/%s", newref);
+ goto rollback;
+ }
+ goto retry;
+ } else {
+ error("unable to move logfile tmp-renamed-log to logs/%s: %s",
+ newref, strerror(errno));
+ goto rollback;
+ }
+ }
+ logmoved = log;
+
+ lock = lock_ref_sha1_basic(newref, NULL, NULL);
+ if (!lock) {
+ error("unable to lock %s for update", newref);
+ goto rollback;
+ }
+
+ lock->force_write = 1;
+ hashcpy(lock->old_sha1, orig_sha1);
+ if (write_ref_sha1(lock, orig_sha1, msg)) {
+ error("unable to write current sha1 into %s", newref);
+ goto rollback;
+ }
+
+ return 0;
+
+ rollback:
+ lock = lock_ref_sha1_basic(oldref, NULL, NULL);
+ if (!lock) {
+ error("unable to lock %s for rollback", oldref);
+ goto rollbacklog;
+ }
+
+ lock->force_write = 1;
+ flag = log_all_ref_updates;
+ log_all_ref_updates = 0;
+ if (write_ref_sha1(lock, orig_sha1, NULL))
+ error("unable to write current sha1 into %s", oldref);
+ log_all_ref_updates = flag;
+
+ rollbacklog:
+ if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
+ error("unable to restore logfile %s from %s: %s",
+ oldref, newref, strerror(errno));
+ if (!logmoved && log &&
+ rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
+ error("unable to restore logfile %s from tmp-renamed-log: %s",
+ oldref, strerror(errno));
+
+ return 1;
+}
+
void unlock_ref(struct ref_lock *lock)
{
if (lock->lock_fd >= 0) {
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