builtin-branch.c

   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
  13 static const char builtin_branch_usage[] =
  14 "git-branch (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | [-r | -a] [-v] [--abbrev=<length>] ";
  15
  16
  17 static const char *head;
  18 static unsigned char head_sha1[20];
  19
  20 static 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
  39 static void delete_branches(int argc, const char **argv, int force)
  40 {
  41         struct commit *rev, *head_rev = head_rev;
  42         unsigned char sha1[20];
  43         char *name;
  44         int i;
  45
  46         if (!force) {
  47                 head_rev = lookup_commit_reference(head_sha1);
  48                 if (!head_rev)
  49                         die("Couldn't look up commit object for HEAD");
  50         }
  51         for (i = 0; i < argc; i++) {
  52                 if (!strcmp(head, argv[i]))
  53                         die("Cannot delete the branch you are currently on.");
  54
  55                 name = xstrdup(mkpath("refs/heads/%s", argv[i]));
  56                 if (!resolve_ref(name, sha1, 1, NULL))
  57                         die("Branch '%s' not found.", argv[i]);
  58
  59                 rev = lookup_commit_reference(sha1);
  60                 if (!rev)
  61                         die("Couldn't look up commit object for '%s'", name);
  62
  63                 /* This checks whether the merge bases of branch and
  64                  * HEAD contains branch -- which means that the HEAD
  65                  * contains everything in both.
  66                  */
  67
  68                 if (!force &&
  69                     !in_merge_bases(sha1, rev, head_rev)) {
  70                         fprintf(stderr,
  71                                 "The branch '%s' is not a strict subset of your current HEAD.\n"
  72                                 "If you are sure you want to delete it, run 'git branch -D %s'.\n",
  73                                 argv[i], argv[i]);
  74                         exit(1);
  75                 }
  76
  77                 if (delete_ref(name, sha1))
  78                         printf("Error deleting branch '%s'\n", argv[i]);
  79                 else
  80                         printf("Deleted branch %s.\n", argv[i]);
  81
  82                 free(name);
  83         }
  84 }
  85
  86 #define REF_UNKNOWN_TYPE    0x00
  87 #define REF_LOCAL_BRANCH    0x01
  88 #define REF_REMOTE_BRANCH   0x02
  89 #define REF_TAG             0x04
  90
  91 struct ref_item {
  92         char *name;
  93         unsigned int kind;
  94         unsigned char sha1[20];
  95 };
  96
  97 struct ref_list {
  98         int index, alloc, maxwidth;
  99         struct ref_item *list;
 100         int kinds;
 101 };
 102
 103 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 104 {
 105         struct ref_list *ref_list = (struct ref_list*)(cb_data);
 106         struct ref_item *newitem;
 107         int kind = REF_UNKNOWN_TYPE;
 108         int len;
 109
 110         /* Detect kind */
 111         if (!strncmp(refname, "refs/heads/", 11)) {
 112                 kind = REF_LOCAL_BRANCH;
 113                 refname += 11;
 114         } else if (!strncmp(refname, "refs/remotes/", 13)) {
 115                 kind = REF_REMOTE_BRANCH;
 116                 refname += 13;
 117         } else if (!strncmp(refname, "refs/tags/", 10)) {
 118                 kind = REF_TAG;
 119                 refname += 10;
 120         }
 121
 122         /* Don't add types the caller doesn't want */
 123         if ((kind & ref_list->kinds) == 0)
 124                 return 0;
 125
 126         /* Resize buffer */
 127         if (ref_list->index >= ref_list->alloc) {
 128                 ref_list->alloc = alloc_nr(ref_list->alloc);
 129                 ref_list->list = xrealloc(ref_list->list,
 130                                 ref_list->alloc * sizeof(struct ref_item));
 131         }
 132
 133         /* Record the new item */
 134         newitem = &(ref_list->list[ref_list->index++]);
 135         newitem->name = xstrdup(refname);
 136         newitem->kind = kind;
 137         hashcpy(newitem->sha1, sha1);
 138         len = strlen(newitem->name);
 139         if (len > ref_list->maxwidth)
 140                 ref_list->maxwidth = len;
 141
 142         return 0;
 143 }
 144
 145 static void free_ref_list(struct ref_list *ref_list)
 146 {
 147         int i;
 148
 149         for (i = 0; i < ref_list->index; i++)
 150                 free(ref_list->list[i].name);
 151         free(ref_list->list);
 152 }
 153
 154 static int ref_cmp(const void *r1, const void *r2)
 155 {
 156         struct ref_item *c1 = (struct ref_item *)(r1);
 157         struct ref_item *c2 = (struct ref_item *)(r2);
 158
 159         if (c1->kind != c2->kind)
 160                 return c1->kind - c2->kind;
 161         return strcmp(c1->name, c2->name);
 162 }
 163
 164 static void print_ref_info(const unsigned char *sha1, int abbrev)
 165 {
 166         struct commit *commit;
 167         char subject[256];
 168
 169
 170         commit = lookup_commit(sha1);
 171         if (commit && !parse_commit(commit))
 172                 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 173                                     subject, sizeof(subject), 0,
 174                                     NULL, NULL, 0);
 175         else
 176                 strcpy(subject, " **** invalid ref ****");
 177
 178         printf(" %s %s\n", find_unique_abbrev(sha1, abbrev), subject);
 179 }
 180
 181 static void print_ref_list(int kinds, int verbose, int abbrev)
 182 {
 183         int i;
 184         char c;
 185         struct ref_list ref_list;
 186
 187         memset(&ref_list, 0, sizeof(ref_list));
 188         ref_list.kinds = kinds;
 189         for_each_ref(append_ref, &ref_list);
 190
 191         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 192
 193         for (i = 0; i < ref_list.index; i++) {
 194                 c = ' ';
 195                 if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
 196                                 !strcmp(ref_list.list[i].name, head))
 197                         c = '*';
 198
 199                 if (verbose) {
 200                         printf("%c %-*s", c, ref_list.maxwidth,
 201                                ref_list.list[i].name);
 202                         print_ref_info(ref_list.list[i].sha1, abbrev);
 203                 }
 204                 else
 205                         printf("%c %s\n", c, ref_list.list[i].name);
 206         }
 207
 208         free_ref_list(&ref_list);
 209 }
 210
 211 static void create_branch(const char *name, const char *start,
 212                           int force, int reflog)
 213 {
 214         struct ref_lock *lock;
 215         struct commit *commit;
 216         unsigned char sha1[20];
 217         char ref[PATH_MAX], msg[PATH_MAX + 20];
 218
 219         snprintf(ref, sizeof ref, "refs/heads/%s", name);
 220         if (check_ref_format(ref))
 221                 die("'%s' is not a valid branch name.", name);
 222
 223         if (resolve_ref(ref, sha1, 1, NULL)) {
 224                 if (!force)
 225                         die("A branch named '%s' already exists.", name);
 226                 else if (!strcmp(head, name))
 227                         die("Cannot force update the current branch.");
 228         }
 229
 230         if (get_sha1(start, sha1) ||
 231             (commit = lookup_commit_reference(sha1)) == NULL)
 232                 die("Not a valid branch point: '%s'.", start);
 233         hashcpy(sha1, commit->object.sha1);
 234
 235         lock = lock_any_ref_for_update(ref, NULL);
 236         if (!lock)
 237                 die("Failed to lock ref for update: %s.", strerror(errno));
 238
 239         if (reflog) {
 240                 log_all_ref_updates = 1;
 241                 snprintf(msg, sizeof msg, "branch: Created from %s", start);
 242         }
 243
 244         if (write_ref_sha1(lock, sha1, msg) < 0)
 245                 die("Failed to write ref: %s.", strerror(errno));
 246 }
 247
 248 int cmd_branch(int argc, const char **argv, const char *prefix)
 249 {
 250         int delete = 0, force_delete = 0, force_create = 0;
 251         int verbose = 0, abbrev = DEFAULT_ABBREV;
 252         int reflog = 0;
 253         int kinds = REF_LOCAL_BRANCH;
 254         int i;
 255
 256         git_config(git_default_config);
 257
 258         for (i = 1; i < argc; i++) {
 259                 const char *arg = argv[i];
 260
 261                 if (arg[0] != '-')
 262                         break;
 263                 if (!strcmp(arg, "--")) {
 264                         i++;
 265                         break;
 266                 }
 267                 if (!strcmp(arg, "-d")) {
 268                         delete = 1;
 269                         continue;
 270                 }
 271                 if (!strcmp(arg, "-D")) {
 272                         delete = 1;
 273                         force_delete = 1;
 274                         continue;
 275                 }
 276                 if (!strcmp(arg, "-f")) {
 277                         force_create = 1;
 278                         continue;
 279                 }
 280                 if (!strcmp(arg, "-r")) {
 281                         kinds = REF_REMOTE_BRANCH;
 282                         continue;
 283                 }
 284                 if (!strcmp(arg, "-a")) {
 285                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 286                         continue;
 287                 }
 288                 if (!strcmp(arg, "-l")) {
 289                         reflog = 1;
 290                         continue;
 291                 }
 292                 if (!strncmp(arg, "--abbrev=", 9)) {
 293                         abbrev = atoi(arg+9);
 294                         continue;
 295                 }
 296                 if (!strcmp(arg, "-v")) {
 297                         verbose = 1;
 298                         continue;
 299                 }
 300                 usage(builtin_branch_usage);
 301         }
 302
 303         head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
 304         if (!head)
 305                 die("Failed to resolve HEAD as a valid ref.");
 306         if (strncmp(head, "refs/heads/", 11))
 307                 die("HEAD not found below refs/heads!");
 308         head += 11;
 309
 310         if (delete)
 311                 delete_branches(argc - i, argv + i, force_delete);
 312         else if (i == argc)
 313                 print_ref_list(kinds, verbose, abbrev);
 314         else if (i == argc - 1)
 315                 create_branch(argv[i], head, force_create, reflog);
 316         else if (i == argc - 2)
 317                 create_branch(argv[i], argv[i + 1], force_create, reflog);
 318         else
 319                 usage(builtin_branch_usage);
 320
 321         return 0;
 322 }