Andrew's git / gitweb.git / builtin-branch.c
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builtin-branch.con commit xsize_t: check whether we lose bits (46be82d)
   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 "color.h"
  10#include "refs.h"
  11#include "commit.h"
  12#include "builtin.h"
  13
  14static const char builtin_branch_usage[] =
  15  "git-branch [-r] (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [--color | --no-color] [-r | -a] [-v [--abbrev=<length> | --no-abbrev]]";
  16
  17#define REF_UNKNOWN_TYPE    0x00
  18#define REF_LOCAL_BRANCH    0x01
  19#define REF_REMOTE_BRANCH   0x02
  20#define REF_TAG             0x04
  21
  22static const char *head;
  23static unsigned char head_sha1[20];
  24
  25static int branch_use_color;
  26static char branch_colors[][COLOR_MAXLEN] = {
  27        "\033[m",       /* reset */
  28        "",             /* PLAIN (normal) */
  29        "\033[31m",     /* REMOTE (red) */
  30        "",             /* LOCAL (normal) */
  31        "\033[32m",     /* CURRENT (green) */
  32};
  33enum color_branch {
  34        COLOR_BRANCH_RESET = 0,
  35        COLOR_BRANCH_PLAIN = 1,
  36        COLOR_BRANCH_REMOTE = 2,
  37        COLOR_BRANCH_LOCAL = 3,
  38        COLOR_BRANCH_CURRENT = 4,
  39};
  40
  41static int parse_branch_color_slot(const char *var, int ofs)
  42{
  43        if (!strcasecmp(var+ofs, "plain"))
  44                return COLOR_BRANCH_PLAIN;
  45        if (!strcasecmp(var+ofs, "reset"))
  46                return COLOR_BRANCH_RESET;
  47        if (!strcasecmp(var+ofs, "remote"))
  48                return COLOR_BRANCH_REMOTE;
  49        if (!strcasecmp(var+ofs, "local"))
  50                return COLOR_BRANCH_LOCAL;
  51        if (!strcasecmp(var+ofs, "current"))
  52                return COLOR_BRANCH_CURRENT;
  53        die("bad config variable '%s'", var);
  54}
  55
  56int git_branch_config(const char *var, const char *value)
  57{
  58        if (!strcmp(var, "color.branch")) {
  59                branch_use_color = git_config_colorbool(var, value);
  60                return 0;
  61        }
  62        if (!prefixcmp(var, "color.branch.")) {
  63                int slot = parse_branch_color_slot(var, 13);
  64                color_parse(value, var, branch_colors[slot]);
  65                return 0;
  66        }
  67        return git_default_config(var, value);
  68}
  69
  70const char *branch_get_color(enum color_branch ix)
  71{
  72        if (branch_use_color)
  73                return branch_colors[ix];
  74        return "";
  75}
  76
  77static int delete_branches(int argc, const char **argv, int force, int kinds)
  78{
  79        struct commit *rev, *head_rev = head_rev;
  80        unsigned char sha1[20];
  81        char *name = NULL;
  82        const char *fmt, *remote;
  83        int i;
  84        int ret = 0;
  85
  86        switch (kinds) {
  87        case REF_REMOTE_BRANCH:
  88                fmt = "refs/remotes/%s";
  89                remote = "remote ";
  90                force = 1;
  91                break;
  92        case REF_LOCAL_BRANCH:
  93                fmt = "refs/heads/%s";
  94                remote = "";
  95                break;
  96        default:
  97                die("cannot use -a with -d");
  98        }
  99
 100        if (!force) {
 101                head_rev = lookup_commit_reference(head_sha1);
 102                if (!head_rev)
 103                        die("Couldn't look up commit object for HEAD");
 104        }
 105        for (i = 0; i < argc; i++) {
 106                if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
 107                        error("Cannot delete the branch '%s' "
 108                                "which you are currently on.", argv[i]);
 109                        ret = 1;
 110                        continue;
 111                }
 112
 113                if (name)
 114                        free(name);
 115
 116                name = xstrdup(mkpath(fmt, argv[i]));
 117                if (!resolve_ref(name, sha1, 1, NULL)) {
 118                        error("%sbranch '%s' not found.",
 119                                        remote, argv[i]);
 120                        ret = 1;
 121                        continue;
 122                }
 123
 124                rev = lookup_commit_reference(sha1);
 125                if (!rev) {
 126                        error("Couldn't look up commit object for '%s'", name);
 127                        ret = 1;
 128                        continue;
 129                }
 130
 131                /* This checks whether the merge bases of branch and
 132                 * HEAD contains branch -- which means that the HEAD
 133                 * contains everything in both.
 134                 */
 135
 136                if (!force &&
 137                    !in_merge_bases(rev, &head_rev, 1)) {
 138                        error("The branch '%s' is not a strict subset of "
 139                                "your current HEAD.\n"
 140                                "If you are sure you want to delete it, "
 141                                "run 'git branch -D %s'.", argv[i], argv[i]);
 142                        ret = 1;
 143                        continue;
 144                }
 145
 146                if (delete_ref(name, sha1)) {
 147                        error("Error deleting %sbranch '%s'", remote,
 148                               argv[i]);
 149                        ret = 1;
 150                } else
 151                        printf("Deleted %sbranch %s.\n", remote, argv[i]);
 152
 153        }
 154
 155        if (name)
 156                free(name);
 157
 158        return(ret);
 159}
 160
 161struct ref_item {
 162        char *name;
 163        unsigned int kind;
 164        unsigned char sha1[20];
 165};
 166
 167struct ref_list {
 168        int index, alloc, maxwidth;
 169        struct ref_item *list;
 170        int kinds;
 171};
 172
 173static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 174{
 175        struct ref_list *ref_list = (struct ref_list*)(cb_data);
 176        struct ref_item *newitem;
 177        int kind = REF_UNKNOWN_TYPE;
 178        int len;
 179
 180        /* Detect kind */
 181        if (!prefixcmp(refname, "refs/heads/")) {
 182                kind = REF_LOCAL_BRANCH;
 183                refname += 11;
 184        } else if (!prefixcmp(refname, "refs/remotes/")) {
 185                kind = REF_REMOTE_BRANCH;
 186                refname += 13;
 187        } else if (!prefixcmp(refname, "refs/tags/")) {
 188                kind = REF_TAG;
 189                refname += 10;
 190        }
 191
 192        /* Don't add types the caller doesn't want */
 193        if ((kind & ref_list->kinds) == 0)
 194                return 0;
 195
 196        /* Resize buffer */
 197        if (ref_list->index >= ref_list->alloc) {
 198                ref_list->alloc = alloc_nr(ref_list->alloc);
 199                ref_list->list = xrealloc(ref_list->list,
 200                                ref_list->alloc * sizeof(struct ref_item));
 201        }
 202
 203        /* Record the new item */
 204        newitem = &(ref_list->list[ref_list->index++]);
 205        newitem->name = xstrdup(refname);
 206        newitem->kind = kind;
 207        hashcpy(newitem->sha1, sha1);
 208        len = strlen(newitem->name);
 209        if (len > ref_list->maxwidth)
 210                ref_list->maxwidth = len;
 211
 212        return 0;
 213}
 214
 215static void free_ref_list(struct ref_list *ref_list)
 216{
 217        int i;
 218
 219        for (i = 0; i < ref_list->index; i++)
 220                free(ref_list->list[i].name);
 221        free(ref_list->list);
 222}
 223
 224static int ref_cmp(const void *r1, const void *r2)
 225{
 226        struct ref_item *c1 = (struct ref_item *)(r1);
 227        struct ref_item *c2 = (struct ref_item *)(r2);
 228
 229        if (c1->kind != c2->kind)
 230                return c1->kind - c2->kind;
 231        return strcmp(c1->name, c2->name);
 232}
 233
 234static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 235                           int abbrev, int current)
 236{
 237        char c;
 238        int color;
 239        struct commit *commit;
 240        char subject[256];
 241
 242        switch (item->kind) {
 243        case REF_LOCAL_BRANCH:
 244                color = COLOR_BRANCH_LOCAL;
 245                break;
 246        case REF_REMOTE_BRANCH:
 247                color = COLOR_BRANCH_REMOTE;
 248                break;
 249        default:
 250                color = COLOR_BRANCH_PLAIN;
 251                break;
 252        }
 253
 254        c = ' ';
 255        if (current) {
 256                c = '*';
 257                color = COLOR_BRANCH_CURRENT;
 258        }
 259
 260        if (verbose) {
 261                commit = lookup_commit(item->sha1);
 262                if (commit && !parse_commit(commit))
 263                        pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 264                                            subject, sizeof(subject), 0,
 265                                            NULL, NULL, 0);
 266                else
 267                        strcpy(subject, " **** invalid ref ****");
 268                printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
 269                       maxwidth, item->name,
 270                       branch_get_color(COLOR_BRANCH_RESET),
 271                       find_unique_abbrev(item->sha1, abbrev), subject);
 272        } else {
 273                printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
 274                       branch_get_color(COLOR_BRANCH_RESET));
 275        }
 276}
 277
 278static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
 279{
 280        int i;
 281        struct ref_list ref_list;
 282
 283        memset(&ref_list, 0, sizeof(ref_list));
 284        ref_list.kinds = kinds;
 285        for_each_ref(append_ref, &ref_list);
 286
 287        qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 288
 289        detached = (detached && (kinds & REF_LOCAL_BRANCH));
 290        if (detached) {
 291                struct ref_item item;
 292                item.name = xstrdup("(no branch)");
 293                item.kind = REF_LOCAL_BRANCH;
 294                hashcpy(item.sha1, head_sha1);
 295                if (strlen(item.name) > ref_list.maxwidth)
 296                              ref_list.maxwidth = strlen(item.name);
 297                print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
 298                free(item.name);
 299        }
 300
 301        for (i = 0; i < ref_list.index; i++) {
 302                int current = !detached &&
 303                        (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 304                        !strcmp(ref_list.list[i].name, head);
 305                print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 306                               abbrev, current);
 307        }
 308
 309        free_ref_list(&ref_list);
 310}
 311
 312static void create_branch(const char *name, const char *start_name,
 313                          unsigned char *start_sha1,
 314                          int force, int reflog)
 315{
 316        struct ref_lock *lock;
 317        struct commit *commit;
 318        unsigned char sha1[20];
 319        char ref[PATH_MAX], msg[PATH_MAX + 20];
 320        int forcing = 0;
 321
 322        snprintf(ref, sizeof ref, "refs/heads/%s", name);
 323        if (check_ref_format(ref))
 324                die("'%s' is not a valid branch name.", name);
 325
 326        if (resolve_ref(ref, sha1, 1, NULL)) {
 327                if (!force)
 328                        die("A branch named '%s' already exists.", name);
 329                else if (!is_bare_repository() && !strcmp(head, name))
 330                        die("Cannot force update the current branch.");
 331                forcing = 1;
 332        }
 333
 334        if (start_sha1)
 335                /* detached HEAD */
 336                hashcpy(sha1, start_sha1);
 337        else if (get_sha1(start_name, sha1))
 338                die("Not a valid object name: '%s'.", start_name);
 339
 340        if ((commit = lookup_commit_reference(sha1)) == NULL)
 341                die("Not a valid branch point: '%s'.", start_name);
 342        hashcpy(sha1, commit->object.sha1);
 343
 344        lock = lock_any_ref_for_update(ref, NULL);
 345        if (!lock)
 346                die("Failed to lock ref for update: %s.", strerror(errno));
 347
 348        if (reflog)
 349                log_all_ref_updates = 1;
 350
 351        if (forcing)
 352                snprintf(msg, sizeof msg, "branch: Reset from %s",
 353                         start_name);
 354        else
 355                snprintf(msg, sizeof msg, "branch: Created from %s",
 356                         start_name);
 357
 358        if (write_ref_sha1(lock, sha1, msg) < 0)
 359                die("Failed to write ref: %s.", strerror(errno));
 360}
 361
 362static void rename_branch(const char *oldname, const char *newname, int force)
 363{
 364        char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
 365        unsigned char sha1[20];
 366
 367        if (!oldname)
 368                die("cannot rename the current branch while not on any.");
 369
 370        if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
 371                die("Old branchname too long");
 372
 373        if (check_ref_format(oldref))
 374                die("Invalid branch name: %s", oldref);
 375
 376        if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
 377                die("New branchname too long");
 378
 379        if (check_ref_format(newref))
 380                die("Invalid branch name: %s", newref);
 381
 382        if (resolve_ref(newref, sha1, 1, NULL) && !force)
 383                die("A branch named '%s' already exists.", newname);
 384
 385        snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
 386                 oldref, newref);
 387
 388        if (rename_ref(oldref, newref, logmsg))
 389                die("Branch rename failed");
 390
 391        /* no need to pass logmsg here as HEAD didn't really move */
 392        if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
 393                die("Branch renamed to %s, but HEAD is not updated!", newname);
 394}
 395
 396int cmd_branch(int argc, const char **argv, const char *prefix)
 397{
 398        int delete = 0, force_delete = 0, force_create = 0;
 399        int rename = 0, force_rename = 0;
 400        int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 401        int reflog = 0;
 402        int kinds = REF_LOCAL_BRANCH;
 403        int i;
 404
 405        git_config(git_branch_config);
 406
 407        for (i = 1; i < argc; i++) {
 408                const char *arg = argv[i];
 409
 410                if (arg[0] != '-')
 411                        break;
 412                if (!strcmp(arg, "--")) {
 413                        i++;
 414                        break;
 415                }
 416                if (!strcmp(arg, "-d")) {
 417                        delete = 1;
 418                        continue;
 419                }
 420                if (!strcmp(arg, "-D")) {
 421                        delete = 1;
 422                        force_delete = 1;
 423                        continue;
 424                }
 425                if (!strcmp(arg, "-f")) {
 426                        force_create = 1;
 427                        continue;
 428                }
 429                if (!strcmp(arg, "-m")) {
 430                        rename = 1;
 431                        continue;
 432                }
 433                if (!strcmp(arg, "-M")) {
 434                        rename = 1;
 435                        force_rename = 1;
 436                        continue;
 437                }
 438                if (!strcmp(arg, "-r")) {
 439                        kinds = REF_REMOTE_BRANCH;
 440                        continue;
 441                }
 442                if (!strcmp(arg, "-a")) {
 443                        kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 444                        continue;
 445                }
 446                if (!strcmp(arg, "-l")) {
 447                        reflog = 1;
 448                        continue;
 449                }
 450                if (!prefixcmp(arg, "--no-abbrev")) {
 451                        abbrev = 0;
 452                        continue;
 453                }
 454                if (!prefixcmp(arg, "--abbrev=")) {
 455                        abbrev = strtoul(arg + 9, NULL, 10);
 456                        if (abbrev < MINIMUM_ABBREV)
 457                                abbrev = MINIMUM_ABBREV;
 458                        else if (abbrev > 40)
 459                                abbrev = 40;
 460                        continue;
 461                }
 462                if (!strcmp(arg, "-v")) {
 463                        verbose = 1;
 464                        continue;
 465                }
 466                if (!strcmp(arg, "--color")) {
 467                        branch_use_color = 1;
 468                        continue;
 469                }
 470                if (!strcmp(arg, "--no-color")) {
 471                        branch_use_color = 0;
 472                        continue;
 473                }
 474                usage(builtin_branch_usage);
 475        }
 476
 477        if ((delete && rename) || (delete && force_create) ||
 478            (rename && force_create))
 479                usage(builtin_branch_usage);
 480
 481        head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
 482        if (!head)
 483                die("Failed to resolve HEAD as a valid ref.");
 484        if (!strcmp(head, "HEAD")) {
 485                detached = 1;
 486        }
 487        else {
 488                if (prefixcmp(head, "refs/heads/"))
 489                        die("HEAD not found below refs/heads!");
 490                head += 11;
 491        }
 492
 493        if (delete)
 494                return delete_branches(argc - i, argv + i, force_delete, kinds);
 495        else if (i == argc)
 496                print_ref_list(kinds, detached, verbose, abbrev);
 497        else if (rename && (i == argc - 1))
 498                rename_branch(head, argv[i], force_rename);
 499        else if (rename && (i == argc - 2))
 500                rename_branch(argv[i], argv[i + 1], force_rename);
 501        else if (i == argc - 1)
 502                create_branch(argv[i], head, head_sha1, force_create, reflog);
 503        else if (i == argc - 2)
 504                create_branch(argv[i], argv[i+1], NULL, force_create, reflog);
 505        else
 506                usage(builtin_branch_usage);
 507
 508        return 0;
 509}