builtin/worktree.c

   1 #include "cache.h"
   2 #include "builtin.h"
   3 #include "dir.h"
   4 #include "parse-options.h"
   5 #include "argv-array.h"
   6 #include "branch.h"
   7 #include "refs.h"
   8 #include "run-command.h"
   9 #include "sigchain.h"
  10 #include "refs.h"
  11 #include "utf8.h"
  12 #include "worktree.h"
  13
  14 static const char * const worktree_usage[] = {
  15         N_("git worktree add [<options>] <path> [<branch>]"),
  16         N_("git worktree prune [<options>]"),
  17         N_("git worktree list [<options>]"),
  18         NULL
  19 };
  20
  21 struct add_opts {
  22         int force;
  23         int detach;
  24         const char *new_branch;
  25         int force_new_branch;
  26 };
  27
  28 static int show_only;
  29 static int verbose;
  30 static unsigned long expire;
  31
  32 static int prune_worktree(const char *id, struct strbuf *reason)
  33 {
  34         struct stat st;
  35         char *path;
  36         int fd, len;
  37
  38         if (!is_directory(git_path("worktrees/%s", id))) {
  39                 strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  40                 return 1;
  41         }
  42         if (file_exists(git_path("worktrees/%s/locked", id)))
  43                 return 0;
  44         if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  45                 strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  46                 return 1;
  47         }
  48         fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  49         if (fd < 0) {
  50                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  51                             id, strerror(errno));
  52                 return 1;
  53         }
  54         len = st.st_size;
  55         path = xmalloc(len + 1);
  56         read_in_full(fd, path, len);
  57         close(fd);
  58         while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  59                 len--;
  60         if (!len) {
  61                 strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  62                 free(path);
  63                 return 1;
  64         }
  65         path[len] = '\0';
  66         if (!file_exists(path)) {
  67                 struct stat st_link;
  68                 free(path);
  69                 /*
  70                  * the repo is moved manually and has not been
  71                  * accessed since?
  72                  */
  73                 if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
  74                     st_link.st_nlink > 1)
  75                         return 0;
  76                 if (st.st_mtime <= expire) {
  77                         strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
  78                         return 1;
  79                 } else {
  80                         return 0;
  81                 }
  82         }
  83         free(path);
  84         return 0;
  85 }
  86
  87 static void prune_worktrees(void)
  88 {
  89         struct strbuf reason = STRBUF_INIT;
  90         struct strbuf path = STRBUF_INIT;
  91         DIR *dir = opendir(git_path("worktrees"));
  92         struct dirent *d;
  93         int ret;
  94         if (!dir)
  95                 return;
  96         while ((d = readdir(dir)) != NULL) {
  97                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
  98                         continue;
  99                 strbuf_reset(&reason);
 100                 if (!prune_worktree(d->d_name, &reason))
 101                         continue;
 102                 if (show_only || verbose)
 103                         printf("%s\n", reason.buf);
 104                 if (show_only)
 105                         continue;
 106                 strbuf_reset(&path);
 107                 strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
 108                 ret = remove_dir_recursively(&path, 0);
 109                 if (ret < 0 && errno == ENOTDIR)
 110                         ret = unlink(path.buf);
 111                 if (ret)
 112                         error(_("failed to remove: %s"), strerror(errno));
 113         }
 114         closedir(dir);
 115         if (!show_only)
 116                 rmdir(git_path("worktrees"));
 117         strbuf_release(&reason);
 118         strbuf_release(&path);
 119 }
 120
 121 static int prune(int ac, const char **av, const char *prefix)
 122 {
 123         struct option options[] = {
 124                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 125                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 126                 OPT_EXPIRY_DATE(0, "expire", &expire,
 127                                 N_("expire objects older than <time>")),
 128                 OPT_END()
 129         };
 130
 131         expire = ULONG_MAX;
 132         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 133         if (ac)
 134                 usage_with_options(worktree_usage, options);
 135         prune_worktrees();
 136         return 0;
 137 }
 138
 139 static char *junk_work_tree;
 140 static char *junk_git_dir;
 141 static int is_junk;
 142 static pid_t junk_pid;
 143
 144 static void remove_junk(void)
 145 {
 146         struct strbuf sb = STRBUF_INIT;
 147         if (!is_junk || getpid() != junk_pid)
 148                 return;
 149         if (junk_git_dir) {
 150                 strbuf_addstr(&sb, junk_git_dir);
 151                 remove_dir_recursively(&sb, 0);
 152                 strbuf_reset(&sb);
 153         }
 154         if (junk_work_tree) {
 155                 strbuf_addstr(&sb, junk_work_tree);
 156                 remove_dir_recursively(&sb, 0);
 157         }
 158         strbuf_release(&sb);
 159 }
 160
 161 static void remove_junk_on_signal(int signo)
 162 {
 163         remove_junk();
 164         sigchain_pop(signo);
 165         raise(signo);
 166 }
 167
 168 static const char *worktree_basename(const char *path, int *olen)
 169 {
 170         const char *name;
 171         int len;
 172
 173         len = strlen(path);
 174         while (len && is_dir_sep(path[len - 1]))
 175                 len--;
 176
 177         for (name = path + len - 1; name > path; name--)
 178                 if (is_dir_sep(*name)) {
 179                         name++;
 180                         break;
 181                 }
 182
 183         *olen = len;
 184         return name;
 185 }
 186
 187 static int add_worktree(const char *path, const char *refname,
 188                         const struct add_opts *opts)
 189 {
 190         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 191         struct strbuf sb = STRBUF_INIT;
 192         const char *name;
 193         struct stat st;
 194         struct child_process cp;
 195         struct argv_array child_env = ARGV_ARRAY_INIT;
 196         int counter = 0, len, ret;
 197         struct strbuf symref = STRBUF_INIT;
 198         struct commit *commit = NULL;
 199
 200         if (file_exists(path) && !is_empty_dir(path))
 201                 die(_("'%s' already exists"), path);
 202
 203         /* is 'refname' a branch or commit? */
 204         if (opts->force_new_branch) /* definitely a branch */
 205                 ;
 206         else if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 207                  ref_exists(symref.buf)) { /* it's a branch */
 208                 if (!opts->force)
 209                         die_if_checked_out(symref.buf);
 210         } else { /* must be a commit */
 211                 commit = lookup_commit_reference_by_name(refname);
 212                 if (!commit)
 213                         die(_("invalid reference: %s"), refname);
 214         }
 215
 216         name = worktree_basename(path, &len);
 217         strbuf_addstr(&sb_repo,
 218                       git_path("worktrees/%.*s", (int)(path + len - name), name));
 219         len = sb_repo.len;
 220         if (safe_create_leading_directories_const(sb_repo.buf))
 221                 die_errno(_("could not create leading directories of '%s'"),
 222                           sb_repo.buf);
 223         while (!stat(sb_repo.buf, &st)) {
 224                 counter++;
 225                 strbuf_setlen(&sb_repo, len);
 226                 strbuf_addf(&sb_repo, "%d", counter);
 227         }
 228         name = strrchr(sb_repo.buf, '/') + 1;
 229
 230         junk_pid = getpid();
 231         atexit(remove_junk);
 232         sigchain_push_common(remove_junk_on_signal);
 233
 234         if (mkdir(sb_repo.buf, 0777))
 235                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 236         junk_git_dir = xstrdup(sb_repo.buf);
 237         is_junk = 1;
 238
 239         /*
 240          * lock the incomplete repo so prune won't delete it, unlock
 241          * after the preparation is over.
 242          */
 243         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 244         write_file(sb.buf, "initializing");
 245
 246         strbuf_addf(&sb_git, "%s/.git", path);
 247         if (safe_create_leading_directories_const(sb_git.buf))
 248                 die_errno(_("could not create leading directories of '%s'"),
 249                           sb_git.buf);
 250         junk_work_tree = xstrdup(path);
 251
 252         strbuf_reset(&sb);
 253         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 254         write_file(sb.buf, "%s", real_path(sb_git.buf));
 255         write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 256                    real_path(get_git_common_dir()), name);
 257         /*
 258          * This is to keep resolve_ref() happy. We need a valid HEAD
 259          * or is_git_directory() will reject the directory. Any value which
 260          * looks like an object ID will do since it will be immediately
 261          * replaced by the symbolic-ref or update-ref invocation in the new
 262          * worktree.
 263          */
 264         strbuf_reset(&sb);
 265         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 266         write_file(sb.buf, "0000000000000000000000000000000000000000");
 267         strbuf_reset(&sb);
 268         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 269         write_file(sb.buf, "../..");
 270
 271         fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 272
 273         argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 274         argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 275         memset(&cp, 0, sizeof(cp));
 276         cp.git_cmd = 1;
 277
 278         if (commit)
 279                 argv_array_pushl(&cp.args, "update-ref", "HEAD",
 280                                  oid_to_hex(&commit->object.oid), NULL);
 281         else
 282                 argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 283                                  symref.buf, NULL);
 284         cp.env = child_env.argv;
 285         ret = run_command(&cp);
 286         if (ret)
 287                 goto done;
 288
 289         cp.argv = NULL;
 290         argv_array_clear(&cp.args);
 291         argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 292         cp.env = child_env.argv;
 293         ret = run_command(&cp);
 294         if (!ret) {
 295                 is_junk = 0;
 296                 free(junk_work_tree);
 297                 free(junk_git_dir);
 298                 junk_work_tree = NULL;
 299                 junk_git_dir = NULL;
 300         }
 301 done:
 302         strbuf_reset(&sb);
 303         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 304         unlink_or_warn(sb.buf);
 305         argv_array_clear(&child_env);
 306         strbuf_release(&sb);
 307         strbuf_release(&symref);
 308         strbuf_release(&sb_repo);
 309         strbuf_release(&sb_git);
 310         return ret;
 311 }
 312
 313 static int add(int ac, const char **av, const char *prefix)
 314 {
 315         struct add_opts opts;
 316         const char *new_branch_force = NULL;
 317         const char *path, *branch;
 318         struct option options[] = {
 319                 OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
 320                 OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 321                            N_("create a new branch")),
 322                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 323                            N_("create or reset a branch")),
 324                 OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 325                 OPT_END()
 326         };
 327
 328         memset(&opts, 0, sizeof(opts));
 329         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 330         if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 331                 die(_("-b, -B, and --detach are mutually exclusive"));
 332         if (ac < 1 || ac > 2)
 333                 usage_with_options(worktree_usage, options);
 334
 335         path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
 336         branch = ac < 2 ? "HEAD" : av[1];
 337
 338         opts.force_new_branch = !!new_branch_force;
 339         if (opts.force_new_branch)
 340                 opts.new_branch = new_branch_force;
 341
 342         if (ac < 2 && !opts.new_branch && !opts.detach) {
 343                 int n;
 344                 const char *s = worktree_basename(path, &n);
 345                 opts.new_branch = xstrndup(s, n);
 346         }
 347
 348         if (opts.new_branch) {
 349                 struct child_process cp;
 350                 memset(&cp, 0, sizeof(cp));
 351                 cp.git_cmd = 1;
 352                 argv_array_push(&cp.args, "branch");
 353                 if (opts.force_new_branch)
 354                         argv_array_push(&cp.args, "--force");
 355                 argv_array_push(&cp.args, opts.new_branch);
 356                 argv_array_push(&cp.args, branch);
 357                 if (run_command(&cp))
 358                         return -1;
 359                 branch = opts.new_branch;
 360         }
 361
 362         return add_worktree(path, branch, &opts);
 363 }
 364
 365 static void show_worktree_porcelain(struct worktree *wt)
 366 {
 367         printf("worktree %s\n", wt->path);
 368         if (wt->is_bare)
 369                 printf("bare\n");
 370         else {
 371                 printf("HEAD %s\n", sha1_to_hex(wt->head_sha1));
 372                 if (wt->is_detached)
 373                         printf("detached\n");
 374                 else
 375                         printf("branch %s\n", wt->head_ref);
 376         }
 377         printf("\n");
 378 }
 379
 380 static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 381 {
 382         struct strbuf sb = STRBUF_INIT;
 383         int cur_path_len = strlen(wt->path);
 384         int path_adj = cur_path_len - utf8_strwidth(wt->path);
 385
 386         strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 387         if (wt->is_bare)
 388                 strbuf_addstr(&sb, "(bare)");
 389         else {
 390                 strbuf_addf(&sb, "%-*s ", abbrev_len,
 391                                 find_unique_abbrev(wt->head_sha1, DEFAULT_ABBREV));
 392                 if (!wt->is_detached)
 393                         strbuf_addf(&sb, "[%s]", shorten_unambiguous_ref(wt->head_ref, 0));
 394                 else
 395                         strbuf_addstr(&sb, "(detached HEAD)");
 396         }
 397         printf("%s\n", sb.buf);
 398
 399         strbuf_release(&sb);
 400 }
 401
 402 static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 403 {
 404         int i;
 405
 406         for (i = 0; wt[i]; i++) {
 407                 int sha1_len;
 408                 int path_len = strlen(wt[i]->path);
 409
 410                 if (path_len > *maxlen)
 411                         *maxlen = path_len;
 412                 sha1_len = strlen(find_unique_abbrev(wt[i]->head_sha1, *abbrev));
 413                 if (sha1_len > *abbrev)
 414                         *abbrev = sha1_len;
 415         }
 416 }
 417
 418 static int list(int ac, const char **av, const char *prefix)
 419 {
 420         int porcelain = 0;
 421
 422         struct option options[] = {
 423                 OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 424                 OPT_END()
 425         };
 426
 427         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 428         if (ac)
 429                 usage_with_options(worktree_usage, options);
 430         else {
 431                 struct worktree **worktrees = get_worktrees();
 432                 int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 433
 434                 if (!porcelain)
 435                         measure_widths(worktrees, &abbrev, &path_maxlen);
 436
 437                 for (i = 0; worktrees[i]; i++) {
 438                         if (porcelain)
 439                                 show_worktree_porcelain(worktrees[i]);
 440                         else
 441                                 show_worktree(worktrees[i], path_maxlen, abbrev);
 442                 }
 443                 free_worktrees(worktrees);
 444         }
 445         return 0;
 446 }
 447
 448 int cmd_worktree(int ac, const char **av, const char *prefix)
 449 {
 450         struct option options[] = {
 451                 OPT_END()
 452         };
 453
 454         if (ac < 2)
 455                 usage_with_options(worktree_usage, options);
 456         if (!strcmp(av[1], "add"))
 457                 return add(ac - 1, av + 1, prefix);
 458         if (!strcmp(av[1], "prune"))
 459                 return prune(ac - 1, av + 1, prefix);
 460         if (!strcmp(av[1], "list"))
 461                 return list(ac - 1, av + 1, prefix);
 462         usage_with_options(worktree_usage, options);
 463 }