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https://github.com/git/git.git
synced 2024-11-27 20:14:30 +08:00
git-branch: add options and tests for branch renaming
Extend git-branch with the following options: git-branch -m|-M [<oldbranch>] newbranch The -M variation is required to force renaming over an exsisting branchname. This also indroduces $GIT_DIR/RENAME_REF which is a "metabranch" used when renaming branches. It will always hold the original sha1 for the latest renamed branch. Additionally, if $GIT_DIR/logs/RENAME_REF exists, all branch rename events are logged there. Finally, some testcases are added to verify the new options. Signed-off-by: Lars Hjemli <hjemli@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Lars Hjemli
Junio C Hamano
parent
8ebe185bbf
commit
c976d415e5
@ -8,8 +8,9 @@ git-branch - List, create, or delete branches.
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SYNOPSIS
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--------
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[verse]
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'git-branch' [-r] [-a] [-v] [--abbrev=<length>]
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'git-branch' [-r | -a] [-v [--abbrev=<length>]]
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'git-branch' [-l] [-f] <branchname> [<start-point>]
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'git-branch' (-m | -M) [<oldbranch>] <newbranch>
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'git-branch' (-d | -D) <branchname>...
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DESCRIPTION
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@ -24,6 +25,12 @@ It will start out with a head equal to the one given as <start-point>.
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If no <start-point> is given, the branch will be created with a head
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equal to that of the currently checked out branch.
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With a '-m' or '-M' option, <oldbranch> will be renamed to <newbranch>.
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If <oldbranch> had a corresponding reflog, it is renamed to match
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<newbranch>, and a reflog entry is created to remember the branch
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renaming. If <newbranch> exists, -M must be used to force the rename
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to happen.
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With a `-d` or `-D` option, `<branchname>` will be deleted. You may
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specify more than one branch for deletion. If the branch currently
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has a ref log then the ref log will also be deleted.
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@ -46,6 +53,12 @@ OPTIONS
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Force the creation of a new branch even if it means deleting
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a branch that already exists with the same name.
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-m::
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Move/rename a branch and the corresponding reflog.
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-M::
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Move/rename a branch even if the new branchname already exists.
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-r::
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List the remote-tracking branches.
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@ -53,7 +66,7 @@ OPTIONS
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List both remote-tracking branches and local branches.
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-v::
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Show sha1 and subject message for each head.
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Show sha1 and commit subjectline for each head.
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--abbrev=<length>::
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Alter minimum display length for sha1 in output listing,
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@ -70,6 +83,12 @@ OPTIONS
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be given as a branch name, a commit-id, or a tag. If this option
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is omitted, the current branch is assumed.
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<oldbranch>::
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The name of an existing branch to rename.
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<newbranch>::
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The new name for an existing branch. The same restrictions as for
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<branchname> applies.
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Examples
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@ -11,7 +11,7 @@
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#include "builtin.h"
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static const char builtin_branch_usage[] =
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"git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | [-r | -a] [-v] [--abbrev=<length>] ";
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"git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [-r | -a] [-v [--abbrev=<length>]]";
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static const char *head;
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@ -245,9 +245,37 @@ static void create_branch(const char *name, const char *start,
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die("Failed to write ref: %s.", strerror(errno));
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}
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static void rename_branch(const char *oldname, const char *newname, int force)
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{
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char oldref[PATH_MAX], newref[PATH_MAX];
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unsigned char sha1[20];
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if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
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die("Old branchname too long");
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if (check_ref_format(oldref))
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die("Invalid branch name: %s", oldref);
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if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
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die("New branchname too long");
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if (check_ref_format(newref))
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die("Invalid branch name: %s", newref);
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if (resolve_ref(newref, sha1, 1, NULL) && !force)
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die("A branch named '%s' already exists.", newname);
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if (rename_ref(oldref, newref))
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die("Branch rename failed");
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if (!strcmp(oldname, head) && create_symref("HEAD", newref))
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die("Branch renamed to %s, but HEAD is not updated!", newname);
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}
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int cmd_branch(int argc, const char **argv, const char *prefix)
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{
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int delete = 0, force_delete = 0, force_create = 0;
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int rename = 0, force_rename = 0;
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int verbose = 0, abbrev = DEFAULT_ABBREV;
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int reflog = 0;
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int kinds = REF_LOCAL_BRANCH;
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@ -277,6 +305,15 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
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force_create = 1;
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continue;
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}
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if (!strcmp(arg, "-m")) {
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rename = 1;
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continue;
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}
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if (!strcmp(arg, "-M")) {
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rename = 1;
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force_rename = 1;
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continue;
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}
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if (!strcmp(arg, "-r")) {
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kinds = REF_REMOTE_BRANCH;
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continue;
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@ -300,6 +337,10 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
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usage(builtin_branch_usage);
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}
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if ((delete && rename) || (delete && force_create) ||
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(rename && force_create))
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usage(builtin_branch_usage);
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head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
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if (!head)
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die("Failed to resolve HEAD as a valid ref.");
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@ -311,6 +352,10 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
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delete_branches(argc - i, argv + i, force_delete);
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else if (i == argc)
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print_ref_list(kinds, verbose, abbrev);
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else if (rename && (i == argc - 1))
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rename_branch(head, argv[i], force_rename);
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else if (rename && (i == argc - 2))
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rename_branch(argv[i], argv[i + 1], force_rename);
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else if (i == argc - 1)
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create_branch(argv[i], head, force_create, reflog);
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else if (i == argc - 2)
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169
refs.c
169
refs.c
@ -610,6 +610,29 @@ static int remove_empty_directories(char *file)
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return remove_empty_dir_recursive(path, len);
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}
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static int is_refname_available(const char *ref, const char *oldref,
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struct ref_list *list, int quiet)
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{
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int namlen = strlen(ref); /* e.g. 'foo/bar' */
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while (list) {
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/* list->name could be 'foo' or 'foo/bar/baz' */
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if (!oldref || strcmp(oldref, list->name)) {
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int len = strlen(list->name);
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int cmplen = (namlen < len) ? namlen : len;
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const char *lead = (namlen < len) ? list->name : ref;
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if (!strncmp(ref, list->name, cmplen) &&
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lead[cmplen] == '/') {
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if (!quiet)
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error("'%s' exists; cannot create '%s'",
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list->name, ref);
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return 0;
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}
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}
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list = list->next;
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}
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return 1;
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}
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static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
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{
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char *ref_file;
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@ -643,29 +666,14 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char
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orig_ref, strerror(errno));
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goto error_return;
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}
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if (is_null_sha1(lock->old_sha1)) {
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/* The ref did not exist and we are creating it.
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* Make sure there is no existing ref that is packed
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* whose name begins with our refname, nor a ref whose
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* name is a proper prefix of our refname.
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*/
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int namlen = strlen(ref); /* e.g. 'foo/bar' */
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struct ref_list *list = get_packed_refs();
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while (list) {
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/* list->name could be 'foo' or 'foo/bar/baz' */
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int len = strlen(list->name);
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int cmplen = (namlen < len) ? namlen : len;
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const char *lead = (namlen < len) ? list->name : ref;
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if (!strncmp(ref, list->name, cmplen) &&
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lead[cmplen] == '/') {
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error("'%s' exists; cannot create '%s'",
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list->name, ref);
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goto error_return;
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}
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list = list->next;
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}
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}
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/* When the ref did not exist and we are creating it,
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* make sure there is no existing ref that is packed
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* whose name begins with our refname, nor a ref whose
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* name is a proper prefix of our refname.
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*/
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if (is_null_sha1(lock->old_sha1) &&
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!is_refname_available(ref, NULL, get_packed_refs(), 0))
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goto error_return;
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lock->lk = xcalloc(1, sizeof(struct lock_file));
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@ -776,6 +784,121 @@ int delete_ref(const char *refname, unsigned char *sha1)
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return ret;
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}
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int rename_ref(const char *oldref, const char *newref)
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{
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static const char renamed_ref[] = "RENAMED-REF";
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unsigned char sha1[20], orig_sha1[20];
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int flag = 0, logmoved = 0;
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struct ref_lock *lock;
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char msg[PATH_MAX*2 + 100];
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struct stat loginfo;
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int log = !stat(git_path("logs/%s", oldref), &loginfo);
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if (S_ISLNK(loginfo.st_mode))
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return error("reflog for %s is a symlink", oldref);
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if (!resolve_ref(oldref, orig_sha1, 1, &flag))
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return error("refname %s not found", oldref);
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if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
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return 1;
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if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
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return 1;
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if (snprintf(msg, sizeof(msg), "renamed %s to %s", oldref, newref) > sizeof(msg))
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return error("Refnames to long");
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lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
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if (!lock)
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return error("unable to lock %s", renamed_ref);
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lock->force_write = 1;
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if (write_ref_sha1(lock, orig_sha1, msg))
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return error("unable to save current sha1 in %s", renamed_ref);
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if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
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return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
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oldref, strerror(errno));
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if (delete_ref(oldref, orig_sha1)) {
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error("unable to delete old %s", oldref);
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goto rollback;
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}
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if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
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if (errno==EISDIR) {
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if (remove_empty_directories(git_path("%s", newref))) {
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error("Directory not empty: %s", newref);
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goto rollback;
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}
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} else {
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error("unable to delete existing %s", newref);
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goto rollback;
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}
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}
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if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
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error("unable to create directory for %s", newref);
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goto rollback;
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}
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retry:
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if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
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if (errno==EISDIR) {
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if (remove_empty_directories(git_path("logs/%s", newref))) {
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error("Directory not empty: logs/%s", newref);
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goto rollback;
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}
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goto retry;
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} else {
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error("unable to move logfile tmp-renamed-log to logs/%s: %s",
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newref, strerror(errno));
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goto rollback;
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}
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}
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logmoved = log;
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lock = lock_ref_sha1_basic(newref, NULL, NULL);
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if (!lock) {
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error("unable to lock %s for update", newref);
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goto rollback;
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}
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lock->force_write = 1;
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hashcpy(lock->old_sha1, orig_sha1);
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if (write_ref_sha1(lock, orig_sha1, msg)) {
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error("unable to write current sha1 into %s", newref);
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goto rollback;
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}
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return 0;
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rollback:
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lock = lock_ref_sha1_basic(oldref, NULL, NULL);
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if (!lock) {
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error("unable to lock %s for rollback", oldref);
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goto rollbacklog;
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}
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lock->force_write = 1;
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flag = log_all_ref_updates;
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log_all_ref_updates = 0;
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if (write_ref_sha1(lock, orig_sha1, NULL))
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error("unable to write current sha1 into %s", oldref);
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log_all_ref_updates = flag;
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rollbacklog:
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if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
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error("unable to restore logfile %s from %s: %s",
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oldref, newref, strerror(errno));
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if (!logmoved && log &&
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rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
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error("unable to restore logfile %s from tmp-renamed-log: %s",
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oldref, strerror(errno));
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return 1;
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}
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void unlock_ref(struct ref_lock *lock)
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{
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if (lock->lock_fd >= 0) {
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3
refs.h
3
refs.h
@ -47,4 +47,7 @@ extern int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned
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/** Returns 0 if target has the right format for a ref. **/
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extern int check_ref_format(const char *target);
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/** rename ref, return 0 on success **/
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extern int rename_ref(const char *oldref, const char *newref);
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#endif /* REFS_H */
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@ -70,4 +70,38 @@ test_expect_success \
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git-branch -d l/m &&
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git-branch l'
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test_expect_success \
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'git branch -m m m/m should work' \
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'git-branch -l m &&
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git-branch -m m m/m &&
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test -f .git/logs/refs/heads/m/m'
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test_expect_success \
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'git branch -m n/n n should work' \
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'git-branch -l n/n &&
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git-branch -m n/n n
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test -f .git/logs/refs/heads/n'
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test_expect_failure \
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'git branch -m o/o o should fail when o/p exists' \
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'git-branch o/o &&
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git-branch o/p &&
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git-branch -m o/o o'
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test_expect_failure \
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'git branch -m q r/q should fail when r exists' \
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'git-branch q &&
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git-branch r &&
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git-branch -m q r/q'
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test_expect_success \
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'git branch -m s/s s should work when s/t is deleted' \
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'git-branch -l s/s &&
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test -f .git/logs/refs/heads/s/s &&
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git-branch -l s/t &&
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test -f .git/logs/refs/heads/s/t &&
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git-branch -d s/t &&
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git-branch -m s/s s &&
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test -f .git/logs/refs/heads/s'
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test_done
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