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;
  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
  87 struct ref_item {
  88         char *name;
  89         unsigned int kind;
  90         unsigned char sha1[20];
  91 };
  92
  93 struct ref_list {
  94         int index, alloc, maxwidth;
  95         struct ref_item *list;
  96         int kinds;
  97 };
  98
  99 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 100 {
 101         struct ref_list *ref_list = (struct ref_list*)(cb_data);
 102         struct ref_item *newitem;
 103         int kind = REF_UNKNOWN_TYPE;
 104         int len;
 105
 106         /* Detect kind */
 107         if (!strncmp(refname, "refs/heads/", 11)) {
 108                 kind = REF_LOCAL_BRANCH;
 109                 refname += 11;
 110         } else if (!strncmp(refname, "refs/remotes/", 13)) {
 111                 kind = REF_REMOTE_BRANCH;
 112                 refname += 13;
 113         } else if (!strncmp(refname, "refs/tags/", 10)) {
 114                 kind = REF_TAG;
 115                 refname += 10;
 116         }
 117
 118         /* Don't add types the caller doesn't want */
 119         if ((kind & ref_list->kinds) == 0)
 120                 return 0;
 121
 122         /* Resize buffer */
 123         if (ref_list->index >= ref_list->alloc) {
 124                 ref_list->alloc = alloc_nr(ref_list->alloc);
 125                 ref_list->list = xrealloc(ref_list->list,
 126                                 ref_list->alloc * sizeof(struct ref_item));
 127         }
 128
 129         /* Record the new item */
 130         newitem = &(ref_list->list[ref_list->index++]);
 131         newitem->name = xstrdup(refname);
 132         newitem->kind = kind;
 133         hashcpy(newitem->sha1, sha1);
 134         len = strlen(newitem->name);
 135         if (len > ref_list->maxwidth)
 136                 ref_list->maxwidth = len;
 137
 138         return 0;
 139 }
 140
 141 static void free_ref_list(struct ref_list *ref_list)
 142 {
 143         int i;
 144
 145         for (i = 0; i < ref_list->index; i++)
 146                 free(ref_list->list[i].name);
 147         free(ref_list->list);
 148 }
 149
 150 static int ref_cmp(const void *r1, const void *r2)
 151 {
 152         struct ref_item *c1 = (struct ref_item *)(r1);
 153         struct ref_item *c2 = (struct ref_item *)(r2);
 154
 155         if (c1->kind != c2->kind)
 156                 return c1->kind - c2->kind;
 157         return strcmp(c1->name, c2->name);
 158 }
 159
 160 static void print_ref_info(const unsigned char *sha1, int abbrev)
 161 {
 162         struct commit *commit;
 163         char subject[256];
 164
 165
 166         commit = lookup_commit(sha1);
 167         if (commit && !parse_commit(commit))
 168                 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 169                                     subject, sizeof(subject), 0,
 170                                     NULL, NULL, 0);
 171         else
 172                 strcpy(subject, " **** invalid ref ****");
 173
 174         printf(" %s %s\n", find_unique_abbrev(sha1, abbrev), subject);
 175 }
 176
 177 static void print_ref_list(int kinds, int verbose, int abbrev)
 178 {
 179         int i;
 180         char c;
 181         struct ref_list ref_list;
 182
 183         memset(&ref_list, 0, sizeof(ref_list));
 184         ref_list.kinds = kinds;
 185         for_each_ref(append_ref, &ref_list);
 186
 187         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 188
 189         for (i = 0; i < ref_list.index; i++) {
 190                 c = ' ';
 191                 if (ref_list.list[i].kind == REF_LOCAL_BRANCH &&
 192                                 !strcmp(ref_list.list[i].name, head))
 193                         c = '*';
 194
 195                 if (verbose) {
 196                         printf("%c %-*s", c, ref_list.maxwidth,
 197                                ref_list.list[i].name);
 198                         print_ref_info(ref_list.list[i].sha1, abbrev);
 199                 }
 200                 else
 201                         printf("%c %s\n", c, ref_list.list[i].name);
 202         }
 203
 204         free_ref_list(&ref_list);
 205 }
 206
 207 static void create_branch(const char *name, const char *start,
 208                           int force, int reflog)
 209 {
 210         struct ref_lock *lock;
 211         struct commit *commit;
 212         unsigned char sha1[20];
 213         char ref[PATH_MAX], msg[PATH_MAX + 20];
 214
 215         snprintf(ref, sizeof ref, "refs/heads/%s", name);
 216         if (check_ref_format(ref))
 217                 die("'%s' is not a valid branch name.", name);
 218
 219         if (resolve_ref(ref, sha1, 1, NULL)) {
 220                 if (!force)
 221                         die("A branch named '%s' already exists.", name);
 222                 else if (!strcmp(head, name))
 223                         die("Cannot force update the current branch.");
 224         }
 225
 226         if (get_sha1(start, sha1) ||
 227             (commit = lookup_commit_reference(sha1)) == NULL)
 228                 die("Not a valid branch point: '%s'.", start);
 229         hashcpy(sha1, commit->object.sha1);
 230
 231         lock = lock_any_ref_for_update(ref, NULL);
 232         if (!lock)
 233                 die("Failed to lock ref for update: %s.", strerror(errno));
 234
 235         if (reflog) {
 236                 log_all_ref_updates = 1;
 237                 snprintf(msg, sizeof msg, "branch: Created from %s", start);
 238         }
 239
 240         if (write_ref_sha1(lock, sha1, msg) < 0)
 241                 die("Failed to write ref: %s.", strerror(errno));
 242 }
 243
 244 int cmd_branch(int argc, const char **argv, const char *prefix)
 245 {
 246         int delete = 0, force_delete = 0, force_create = 0;
 247         int verbose = 0, abbrev = DEFAULT_ABBREV;
 248         int reflog = 0;
 249         int kinds = REF_LOCAL_BRANCH;
 250         int i;
 251
 252         git_config(git_default_config);
 253
 254         for (i = 1; i < argc; i++) {
 255                 const char *arg = argv[i];
 256
 257                 if (arg[0] != '-')
 258                         break;
 259                 if (!strcmp(arg, "--")) {
 260                         i++;
 261                         break;
 262                 }
 263                 if (!strcmp(arg, "-d")) {
 264                         delete = 1;
 265                         continue;
 266                 }
 267                 if (!strcmp(arg, "-D")) {
 268                         delete = 1;
 269                         force_delete = 1;
 270                         continue;
 271                 }
 272                 if (!strcmp(arg, "-f")) {
 273                         force_create = 1;
 274                         continue;
 275                 }
 276                 if (!strcmp(arg, "-r")) {
 277                         kinds = REF_REMOTE_BRANCH;
 278                         continue;
 279                 }
 280                 if (!strcmp(arg, "-a")) {
 281                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 282                         continue;
 283                 }
 284                 if (!strcmp(arg, "-l")) {
 285                         reflog = 1;
 286                         continue;
 287                 }
 288                 if (!strncmp(arg, "--abbrev=", 9)) {
 289                         abbrev = atoi(arg+9);
 290                         continue;
 291                 }
 292                 if (!strcmp(arg, "-v")) {
 293                         verbose = 1;
 294                         continue;
 295                 }
 296                 usage(builtin_branch_usage);
 297         }
 298
 299         head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
 300         if (!head)
 301                 die("Failed to resolve HEAD as a valid ref.");
 302         if (strncmp(head, "refs/heads/", 11))
 303                 die("HEAD not found below refs/heads!");
 304         head += 11;
 305
 306         if (delete)
 307                 delete_branches(argc - i, argv + i, force_delete);
 308         else if (i == argc)
 309                 print_ref_list(kinds, verbose, abbrev);
 310         else if (i == argc - 1)
 311                 create_branch(argv[i], head, force_create, reflog);
 312         else if (i == argc - 2)
 313                 create_branch(argv[i], argv[i + 1], force_create, reflog);
 314         else
 315                 usage(builtin_branch_usage);
 316
 317         return 0;
 318 }