Andrew's git - gitweb.git/blob

   1/*
   2 * Builtin "git branch"
   3 *
   4 * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
   5 * Based on git-branch.sh by Junio C Hamano.
   6 */
   7
   8#include "cache.h"
   9#include "refs.h"
  10#include "commit.h"
  11#include "builtin.h"
  12
  13static const char builtin_branch_usage[] =
  14"git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | [-r] | [-a]";
  15
  16
  17static const char *head;
  18static unsigned char head_sha1[20];
  19
  20static int in_merge_bases(const unsigned char *sha1,
  21                          struct commit *rev1,
  22                          struct commit *rev2)
  23{
  24        struct commit_list *bases, *b;
  25        int ret = 0;
  26
  27        bases = get_merge_bases(rev1, rev2, 1);
  28        for (b = bases; b; b = b->next) {
  29                if (!hashcmp(sha1, b->item->object.sha1)) {
  30                        ret = 1;
  31                        break;
  32                }
  33        }
  34
  35        free_commit_list(bases);
  36        return ret;
  37}
  38
  39static void delete_branches(int argc, const char **argv, int force)
  40{
  41        struct commit *rev, *head_rev;
  42        unsigned char sha1[20];
  43        char *name;
  44        int i;
  45
  46        head_rev = lookup_commit_reference(head_sha1);
  47        for (i = 0; i < argc; i++) {
  48                if (!strcmp(head, argv[i]))
  49                        die("Cannot delete the branch you are currently on.");
  50
  51                name = xstrdup(mkpath("refs/heads/%s", argv[i]));
  52                if (!resolve_ref(name, sha1, 1, NULL))
  53                        die("Branch '%s' not found.", argv[i]);
  54
  55                rev = lookup_commit_reference(sha1);
  56                if (!rev || !head_rev)
  57                        die("Couldn't look up commit objects.");
  58
  59                /* This checks whether the merge bases of branch and
  60                 * HEAD contains branch -- which means that the HEAD
  61                 * contains everything in both.
  62                 */
  63
  64                if (!force &&
  65                    !in_merge_bases(sha1, rev, head_rev)) {
  66                        fprintf(stderr,
  67                                "The branch '%s' is not a strict subset of your current HEAD.\n"
  68                                "If you are sure you want to delete it, run 'git branch -D %s'.\n",
  69                                argv[i], argv[i]);
  70                        exit(1);
  71                }
  72
  73                if (delete_ref(name, sha1))
  74                        printf("Error deleting branch '%s'\n", argv[i]);
  75                else
  76                        printf("Deleted branch %s.\n", argv[i]);
  77
  78                free(name);
  79        }
  80}
  81
  82#define REF_UNKNOWN_TYPE    0x00
  83#define REF_LOCAL_BRANCH    0x01
  84#define REF_REMOTE_BRANCH   0x02
  85#define REF_TAG             0x04
  86
  87struct ref_item {
  88        char *name;
  89        unsigned int kind;
  90};
  91
  92struct ref_list {
  93        int index, alloc;
  94        struct ref_item *list;
  95        int kinds;
  96};
  97
  98static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
  99{
 100        struct ref_list *ref_list = (struct ref_list*)(cb_data);
 101        struct ref_item *newitem;
 102        int kind = REF_UNKNOWN_TYPE;
 103
 104        /* Detect kind */
 105        if (!strncmp(refname, "refs/heads/", 11)) {
 106                kind = REF_LOCAL_BRANCH;
 107                refname += 11;
 108        } else if (!strncmp(refname, "refs/remotes/", 13)) {
 109                kind = REF_REMOTE_BRANCH;
 110                refname += 13;
 111        } else if (!strncmp(refname, "refs/tags/", 10)) {
 112                kind = REF_TAG;
 113                refname += 10;
 114        }
 115
 116        /* Don't add types the caller doesn't want */
 117        if ((kind & ref_list->kinds) == 0)
 118                return 0;
 119
 120        /* Resize buffer */
 121        if (ref_list->index >= ref_list->alloc) {
 122                ref_list->alloc = alloc_nr(ref_list->alloc);
 123                ref_list->list = xrealloc(ref_list->list,
 124                                ref_list->alloc * sizeof(struct ref_item));
 125        }
 126
 127        /* Record the new item */
 128        newitem = &(ref_list->list[ref_list->index++]);
 129        newitem->name = xstrdup(refname);
 130        newitem->kind = kind;
 131
 132        return 0;
 133}
 134
 135static void free_ref_list(struct ref_list *ref_list)
 136{
 137        int i;
 138
 139        for (i = 0; i < ref_list->index; i++)
 140                free(ref_list->list[i].name);
 141        free(ref_list->list);
 142}
 143
 144static int ref_cmp(const void *r1, const void *r2)
 145{
 146        struct ref_item *c1 = (struct ref_item *)(r1);
 147        struct ref_item *c2 = (struct ref_item *)(r2);
 148
 149        if (c1->kind != c2->kind)
 150                return c1->kind - c2->kind;
 151        return strcmp(c1->name, c2->name);
 152}
 153
 154static void print_ref_list(int kinds)
 155{
 156        int i;
 157        char c;
 158        struct ref_list ref_list;
 159
 160        memset(&ref_list, 0, sizeof(ref_list));
 161        ref_list.kinds = kinds;
 162        for_each_ref(append_ref, &ref_list);
 163
 164        qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 165
 166        for (i = 0; i < ref_list.index; i++) {
 167                c = ' ';
 168                if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
 169                                !strcmp(ref_list.list[i].name, head))
 170                        c = '*';
 171
 172                printf("%c %s\n", c, ref_list.list[i].name);
 173        }
 174
 175        free_ref_list(&ref_list);
 176}
 177
 178static void create_branch(const char *name, const char *start,
 179                          int force, int reflog)
 180{
 181        struct ref_lock *lock;
 182        struct commit *commit;
 183        unsigned char sha1[20];
 184        char ref[PATH_MAX], msg[PATH_MAX + 20];
 185
 186        snprintf(ref, sizeof ref, "refs/heads/%s", name);
 187        if (check_ref_format(ref))
 188                die("'%s' is not a valid branch name.", name);
 189
 190        if (resolve_ref(ref, sha1, 1, NULL)) {
 191                if (!force)
 192                        die("A branch named '%s' already exists.", name);
 193                else if (!strcmp(head, name))
 194                        die("Cannot force update the current branch.");
 195        }
 196
 197        if (get_sha1(start, sha1) ||
 198            (commit = lookup_commit_reference(sha1)) == NULL)
 199                die("Not a valid branch point: '%s'.", start);
 200        hashcpy(sha1, commit->object.sha1);
 201
 202        lock = lock_any_ref_for_update(ref, NULL);
 203        if (!lock)
 204                die("Failed to lock ref for update: %s.", strerror(errno));
 205
 206        if (reflog) {
 207                log_all_ref_updates = 1;
 208                snprintf(msg, sizeof msg, "branch: Created from %s", start);
 209        }
 210
 211        if (write_ref_sha1(lock, sha1, msg) < 0)
 212                die("Failed to write ref: %s.", strerror(errno));
 213}
 214
 215int cmd_branch(int argc, const char **argv, const char *prefix)
 216{
 217        int delete = 0, force_delete = 0, force_create = 0;
 218        int reflog = 0;
 219        int kinds = REF_LOCAL_BRANCH;
 220        int i;
 221
 222        git_config(git_default_config);
 223
 224        for (i = 1; i < argc; i++) {
 225                const char *arg = argv[i];
 226
 227                if (arg[0] != '-')
 228                        break;
 229                if (!strcmp(arg, "--")) {
 230                        i++;
 231                        break;
 232                }
 233                if (!strcmp(arg, "-d")) {
 234                        delete = 1;
 235                        continue;
 236                }
 237                if (!strcmp(arg, "-D")) {
 238                        delete = 1;
 239                        force_delete = 1;
 240                        continue;
 241                }
 242                if (!strcmp(arg, "-f")) {
 243                        force_create = 1;
 244                        continue;
 245                }
 246                if (!strcmp(arg, "-r")) {
 247                        kinds = REF_REMOTE_BRANCH;
 248                        continue;
 249                }
 250                if (!strcmp(arg, "-a")) {
 251                        kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 252                        continue;
 253                }
 254                if (!strcmp(arg, "-l")) {
 255                        reflog = 1;
 256                        continue;
 257                }
 258                usage(builtin_branch_usage);
 259        }
 260
 261        head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
 262        if (!head)
 263                die("Failed to resolve HEAD as a valid ref.");
 264        if (strncmp(head, "refs/heads/", 11))
 265                die("HEAD not found below refs/heads!");
 266        head += 11;
 267
 268        if (delete)
 269                delete_branches(argc - i, argv + i, force_delete);
 270        else if (i == argc)
 271                print_ref_list(kinds);
 272        else if (i == argc - 1)
 273                create_branch(argv[i], head, force_create, reflog);
 274        else if (i == argc - 2)
 275                create_branch(argv[i], argv[i + 1], force_create, reflog);
 276        else
 277                usage(builtin_branch_usage);
 278
 279        return 0;
 280}