git/builtin-branch.c
Junio C Hamano 67affd5173 git-branch -D: make it work even when on a yet-to-be-born branch
This makes "git branch -D other_branch" work even when HEAD
points at a yet-to-be-born branch.

Earlier, we checked the HEAD ref for the purpose of "subset"
check even when the deletion was forced (i.e. not -d but -D).
Because of this, you cannot delete a branch even with -D while
on a yet-to-be-born branch.

With this change, the following sequence that now works:

	mkdir newdir && cd newdir
	git init-db
	git fetch -k $other_repo refs/heads/master:refs/heads/othre
	# oops, typo
	git branch other othre
	git branch -D othre

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-11-24 23:10:23 -08:00

323 lines
7.3 KiB
C

/*
* Builtin "git branch"
*
* Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
* Based on git-branch.sh by Junio C Hamano.
*/
#include "cache.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"
static const char builtin_branch_usage[] =
"git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | [-r | -a] [-v] [--abbrev=<length>] ";
static const char *head;
static unsigned char head_sha1[20];
static int in_merge_bases(const unsigned char *sha1,
struct commit *rev1,
struct commit *rev2)
{
struct commit_list *bases, *b;
int ret = 0;
bases = get_merge_bases(rev1, rev2, 1);
for (b = bases; b; b = b->next) {
if (!hashcmp(sha1, b->item->object.sha1)) {
ret = 1;
break;
}
}
free_commit_list(bases);
return ret;
}
static void delete_branches(int argc, const char **argv, int force)
{
struct commit *rev, *head_rev = head_rev;
unsigned char sha1[20];
char *name;
int i;
if (!force) {
head_rev = lookup_commit_reference(head_sha1);
if (!head_rev)
die("Couldn't look up commit object for HEAD");
}
for (i = 0; i < argc; i++) {
if (!strcmp(head, argv[i]))
die("Cannot delete the branch you are currently on.");
name = xstrdup(mkpath("refs/heads/%s", argv[i]));
if (!resolve_ref(name, sha1, 1, NULL))
die("Branch '%s' not found.", argv[i]);
rev = lookup_commit_reference(sha1);
if (!rev)
die("Couldn't look up commit object for '%s'", name);
/* This checks whether the merge bases of branch and
* HEAD contains branch -- which means that the HEAD
* contains everything in both.
*/
if (!force &&
!in_merge_bases(sha1, rev, head_rev)) {
fprintf(stderr,
"The branch '%s' is not a strict subset of your current HEAD.\n"
"If you are sure you want to delete it, run 'git branch -D %s'.\n",
argv[i], argv[i]);
exit(1);
}
if (delete_ref(name, sha1))
printf("Error deleting branch '%s'\n", argv[i]);
else
printf("Deleted branch %s.\n", argv[i]);
free(name);
}
}
#define REF_UNKNOWN_TYPE 0x00
#define REF_LOCAL_BRANCH 0x01
#define REF_REMOTE_BRANCH 0x02
#define REF_TAG 0x04
struct ref_item {
char *name;
unsigned int kind;
unsigned char sha1[20];
};
struct ref_list {
int index, alloc, maxwidth;
struct ref_item *list;
int kinds;
};
static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
{
struct ref_list *ref_list = (struct ref_list*)(cb_data);
struct ref_item *newitem;
int kind = REF_UNKNOWN_TYPE;
int len;
/* Detect kind */
if (!strncmp(refname, "refs/heads/", 11)) {
kind = REF_LOCAL_BRANCH;
refname += 11;
} else if (!strncmp(refname, "refs/remotes/", 13)) {
kind = REF_REMOTE_BRANCH;
refname += 13;
} else if (!strncmp(refname, "refs/tags/", 10)) {
kind = REF_TAG;
refname += 10;
}
/* Don't add types the caller doesn't want */
if ((kind & ref_list->kinds) == 0)
return 0;
/* Resize buffer */
if (ref_list->index >= ref_list->alloc) {
ref_list->alloc = alloc_nr(ref_list->alloc);
ref_list->list = xrealloc(ref_list->list,
ref_list->alloc * sizeof(struct ref_item));
}
/* Record the new item */
newitem = &(ref_list->list[ref_list->index++]);
newitem->name = xstrdup(refname);
newitem->kind = kind;
hashcpy(newitem->sha1, sha1);
len = strlen(newitem->name);
if (len > ref_list->maxwidth)
ref_list->maxwidth = len;
return 0;
}
static void free_ref_list(struct ref_list *ref_list)
{
int i;
for (i = 0; i < ref_list->index; i++)
free(ref_list->list[i].name);
free(ref_list->list);
}
static int ref_cmp(const void *r1, const void *r2)
{
struct ref_item *c1 = (struct ref_item *)(r1);
struct ref_item *c2 = (struct ref_item *)(r2);
if (c1->kind != c2->kind)
return c1->kind - c2->kind;
return strcmp(c1->name, c2->name);
}
static void print_ref_info(const unsigned char *sha1, int abbrev)
{
struct commit *commit;
char subject[256];
commit = lookup_commit(sha1);
if (commit && !parse_commit(commit))
pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
subject, sizeof(subject), 0,
NULL, NULL, 0);
else
strcpy(subject, " **** invalid ref ****");
printf(" %s %s\n", find_unique_abbrev(sha1, abbrev), subject);
}
static void print_ref_list(int kinds, int verbose, int abbrev)
{
int i;
char c;
struct ref_list ref_list;
memset(&ref_list, 0, sizeof(ref_list));
ref_list.kinds = kinds;
for_each_ref(append_ref, &ref_list);
qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
for (i = 0; i < ref_list.index; i++) {
c = ' ';
if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
!strcmp(ref_list.list[i].name, head))
c = '*';
if (verbose) {
printf("%c %-*s", c, ref_list.maxwidth,
ref_list.list[i].name);
print_ref_info(ref_list.list[i].sha1, abbrev);
}
else
printf("%c %s\n", c, ref_list.list[i].name);
}
free_ref_list(&ref_list);
}
static void create_branch(const char *name, const char *start,
int force, int reflog)
{
struct ref_lock *lock;
struct commit *commit;
unsigned char sha1[20];
char ref[PATH_MAX], msg[PATH_MAX + 20];
snprintf(ref, sizeof ref, "refs/heads/%s", name);
if (check_ref_format(ref))
die("'%s' is not a valid branch name.", name);
if (resolve_ref(ref, sha1, 1, NULL)) {
if (!force)
die("A branch named '%s' already exists.", name);
else if (!strcmp(head, name))
die("Cannot force update the current branch.");
}
if (get_sha1(start, sha1) ||
(commit = lookup_commit_reference(sha1)) == NULL)
die("Not a valid branch point: '%s'.", start);
hashcpy(sha1, commit->object.sha1);
lock = lock_any_ref_for_update(ref, NULL);
if (!lock)
die("Failed to lock ref for update: %s.", strerror(errno));
if (reflog) {
log_all_ref_updates = 1;
snprintf(msg, sizeof msg, "branch: Created from %s", start);
}
if (write_ref_sha1(lock, sha1, msg) < 0)
die("Failed to write ref: %s.", strerror(errno));
}
int cmd_branch(int argc, const char **argv, const char *prefix)
{
int delete = 0, force_delete = 0, force_create = 0;
int verbose = 0, abbrev = DEFAULT_ABBREV;
int reflog = 0;
int kinds = REF_LOCAL_BRANCH;
int i;
git_config(git_default_config);
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (arg[0] != '-')
break;
if (!strcmp(arg, "--")) {
i++;
break;
}
if (!strcmp(arg, "-d")) {
delete = 1;
continue;
}
if (!strcmp(arg, "-D")) {
delete = 1;
force_delete = 1;
continue;
}
if (!strcmp(arg, "-f")) {
force_create = 1;
continue;
}
if (!strcmp(arg, "-r")) {
kinds = REF_REMOTE_BRANCH;
continue;
}
if (!strcmp(arg, "-a")) {
kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
continue;
}
if (!strcmp(arg, "-l")) {
reflog = 1;
continue;
}
if (!strncmp(arg, "--abbrev=", 9)) {
abbrev = atoi(arg+9);
continue;
}
if (!strcmp(arg, "-v")) {
verbose = 1;
continue;
}
usage(builtin_branch_usage);
}
head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
if (!head)
die("Failed to resolve HEAD as a valid ref.");
if (strncmp(head, "refs/heads/", 11))
die("HEAD not found below refs/heads!");
head += 11;
if (delete)
delete_branches(argc - i, argv + i, force_delete);
else if (i == argc)
print_ref_list(kinds, verbose, abbrev);
else if (i == argc - 1)
create_branch(argv[i], head, force_create, reflog);
else if (i == argc - 2)
create_branch(argv[i], argv[i + 1], force_create, reflog);
else
usage(builtin_branch_usage);
return 0;
}