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 "run-command.h"
   7 #include "sigchain.h"
   8 #include "refs.h"
   9
  10 static const char * const worktree_usage[] = {
  11         N_("git worktree add [<options>] <path> <branch>"),
  12         N_("git worktree prune [<options>]"),
  13         NULL
  14 };
  15
  16 static int show_only;
  17 static int verbose;
  18 static unsigned long expire;
  19
  20 static int prune_worktree(const char *id, struct strbuf *reason)
  21 {
  22         struct stat st;
  23         char *path;
  24         int fd, len;
  25
  26         if (!is_directory(git_path("worktrees/%s", id))) {
  27                 strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  28                 return 1;
  29         }
  30         if (file_exists(git_path("worktrees/%s/locked", id)))
  31                 return 0;
  32         if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  33                 strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  34                 return 1;
  35         }
  36         fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  37         if (fd < 0) {
  38                 strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  39                             id, strerror(errno));
  40                 return 1;
  41         }
  42         len = st.st_size;
  43         path = xmalloc(len + 1);
  44         read_in_full(fd, path, len);
  45         close(fd);
  46         while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  47                 len--;
  48         if (!len) {
  49                 strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  50                 free(path);
  51                 return 1;
  52         }
  53         path[len] = '\0';
  54         if (!file_exists(path)) {
  55                 struct stat st_link;
  56                 free(path);
  57                 /*
  58                  * the repo is moved manually and has not been
  59                  * accessed since?
  60                  */
  61                 if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
  62                     st_link.st_nlink > 1)
  63                         return 0;
  64                 if (st.st_mtime <= expire) {
  65                         strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
  66                         return 1;
  67                 } else {
  68                         return 0;
  69                 }
  70         }
  71         free(path);
  72         return 0;
  73 }
  74
  75 static void prune_worktrees(void)
  76 {
  77         struct strbuf reason = STRBUF_INIT;
  78         struct strbuf path = STRBUF_INIT;
  79         DIR *dir = opendir(git_path("worktrees"));
  80         struct dirent *d;
  81         int ret;
  82         if (!dir)
  83                 return;
  84         while ((d = readdir(dir)) != NULL) {
  85                 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
  86                         continue;
  87                 strbuf_reset(&reason);
  88                 if (!prune_worktree(d->d_name, &reason))
  89                         continue;
  90                 if (show_only || verbose)
  91                         printf("%s\n", reason.buf);
  92                 if (show_only)
  93                         continue;
  94                 strbuf_reset(&path);
  95                 strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
  96                 ret = remove_dir_recursively(&path, 0);
  97                 if (ret < 0 && errno == ENOTDIR)
  98                         ret = unlink(path.buf);
  99                 if (ret)
 100                         error(_("failed to remove: %s"), strerror(errno));
 101         }
 102         closedir(dir);
 103         if (!show_only)
 104                 rmdir(git_path("worktrees"));
 105         strbuf_release(&reason);
 106         strbuf_release(&path);
 107 }
 108
 109 static int prune(int ac, const char **av, const char *prefix)
 110 {
 111         struct option options[] = {
 112                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 113                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 114                 OPT_EXPIRY_DATE(0, "expire", &expire,
 115                                 N_("expire objects older than <time>")),
 116                 OPT_END()
 117         };
 118
 119         expire = ULONG_MAX;
 120         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 121         if (ac)
 122                 usage_with_options(worktree_usage, options);
 123         prune_worktrees();
 124         return 0;
 125 }
 126
 127 static char *junk_work_tree;
 128 static char *junk_git_dir;
 129 static int is_junk;
 130 static pid_t junk_pid;
 131
 132 static void remove_junk(void)
 133 {
 134         struct strbuf sb = STRBUF_INIT;
 135         if (!is_junk || getpid() != junk_pid)
 136                 return;
 137         if (junk_git_dir) {
 138                 strbuf_addstr(&sb, junk_git_dir);
 139                 remove_dir_recursively(&sb, 0);
 140                 strbuf_reset(&sb);
 141         }
 142         if (junk_work_tree) {
 143                 strbuf_addstr(&sb, junk_work_tree);
 144                 remove_dir_recursively(&sb, 0);
 145         }
 146         strbuf_release(&sb);
 147 }
 148
 149 static void remove_junk_on_signal(int signo)
 150 {
 151         remove_junk();
 152         sigchain_pop(signo);
 153         raise(signo);
 154 }
 155
 156 static const char *worktree_basename(const char *path, int *olen)
 157 {
 158         const char *name;
 159         int len;
 160
 161         len = strlen(path);
 162         while (len && is_dir_sep(path[len - 1]))
 163                 len--;
 164
 165         for (name = path + len - 1; name > path; name--)
 166                 if (is_dir_sep(*name)) {
 167                         name++;
 168                         break;
 169                 }
 170
 171         *olen = len;
 172         return name;
 173 }
 174
 175 static int add_worktree(const char *path, const char **child_argv)
 176 {
 177         struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 178         struct strbuf sb = STRBUF_INIT;
 179         const char *name;
 180         struct stat st;
 181         struct child_process cp;
 182         int counter = 0, len, ret;
 183         unsigned char rev[20];
 184
 185         if (file_exists(path) && !is_empty_dir(path))
 186                 die(_("'%s' already exists"), path);
 187
 188         name = worktree_basename(path, &len);
 189         strbuf_addstr(&sb_repo,
 190                       git_path("worktrees/%.*s", (int)(path + len - name), name));
 191         len = sb_repo.len;
 192         if (safe_create_leading_directories_const(sb_repo.buf))
 193                 die_errno(_("could not create leading directories of '%s'"),
 194                           sb_repo.buf);
 195         while (!stat(sb_repo.buf, &st)) {
 196                 counter++;
 197                 strbuf_setlen(&sb_repo, len);
 198                 strbuf_addf(&sb_repo, "%d", counter);
 199         }
 200         name = strrchr(sb_repo.buf, '/') + 1;
 201
 202         junk_pid = getpid();
 203         atexit(remove_junk);
 204         sigchain_push_common(remove_junk_on_signal);
 205
 206         if (mkdir(sb_repo.buf, 0777))
 207                 die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 208         junk_git_dir = xstrdup(sb_repo.buf);
 209         is_junk = 1;
 210
 211         /*
 212          * lock the incomplete repo so prune won't delete it, unlock
 213          * after the preparation is over.
 214          */
 215         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 216         write_file(sb.buf, 1, "initializing\n");
 217
 218         strbuf_addf(&sb_git, "%s/.git", path);
 219         if (safe_create_leading_directories_const(sb_git.buf))
 220                 die_errno(_("could not create leading directories of '%s'"),
 221                           sb_git.buf);
 222         junk_work_tree = xstrdup(path);
 223
 224         strbuf_reset(&sb);
 225         strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 226         write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
 227         write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
 228                    real_path(get_git_common_dir()), name);
 229         /*
 230          * This is to keep resolve_ref() happy. We need a valid HEAD
 231          * or is_git_directory() will reject the directory. Moreover, HEAD
 232          * in the new worktree must resolve to the same value as HEAD in
 233          * the current tree since the command invoked to populate the new
 234          * worktree will be handed the branch/ref specified by the user.
 235          * For instance, if the user asks for the new worktree to be based
 236          * at HEAD~5, then the resolved HEAD~5 in the new worktree must
 237          * match the resolved HEAD~5 in the current tree in order to match
 238          * the user's expectation.
 239          */
 240         if (!resolve_ref_unsafe("HEAD", 0, rev, NULL))
 241                 die(_("unable to resolve HEAD"));
 242         strbuf_reset(&sb);
 243         strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 244         write_file(sb.buf, 1, "%s\n", sha1_to_hex(rev));
 245         strbuf_reset(&sb);
 246         strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 247         write_file(sb.buf, 1, "../..\n");
 248
 249         fprintf_ln(stderr, _("Enter %s (identifier %s)"), path, name);
 250
 251         setenv("GIT_CHECKOUT_NEW_WORKTREE", "1", 1);
 252         setenv(GIT_DIR_ENVIRONMENT, sb_git.buf, 1);
 253         setenv(GIT_WORK_TREE_ENVIRONMENT, path, 1);
 254         memset(&cp, 0, sizeof(cp));
 255         cp.git_cmd = 1;
 256         cp.argv = child_argv;
 257         ret = run_command(&cp);
 258         if (!ret) {
 259                 is_junk = 0;
 260                 free(junk_work_tree);
 261                 free(junk_git_dir);
 262                 junk_work_tree = NULL;
 263                 junk_git_dir = NULL;
 264         }
 265         strbuf_reset(&sb);
 266         strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 267         unlink_or_warn(sb.buf);
 268         strbuf_release(&sb);
 269         strbuf_release(&sb_repo);
 270         strbuf_release(&sb_git);
 271         return ret;
 272 }
 273
 274 static int add(int ac, const char **av, const char *prefix)
 275 {
 276         int force = 0, detach = 0;
 277         const char *new_branch = NULL, *new_branch_force = NULL;
 278         const char *path, *branch;
 279         struct argv_array cmd = ARGV_ARRAY_INIT;
 280         struct option options[] = {
 281                 OPT__FORCE(&force, N_("checkout <branch> even if already checked out in other worktree")),
 282                 OPT_STRING('b', NULL, &new_branch, N_("branch"),
 283                            N_("create a new branch")),
 284                 OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 285                            N_("create or reset a branch")),
 286                 OPT_BOOL(0, "detach", &detach, N_("detach HEAD at named commit")),
 287                 OPT_END()
 288         };
 289
 290         ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 291         if (new_branch && new_branch_force)
 292                 die(_("-b and -B are mutually exclusive"));
 293         if (ac < 1 || ac > 2)
 294                 usage_with_options(worktree_usage, options);
 295
 296         path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
 297         branch = ac < 2 ? "HEAD" : av[1];
 298
 299         if (ac < 2 && !new_branch && !new_branch_force) {
 300                 int n;
 301                 const char *s = worktree_basename(path, &n);
 302                 new_branch = xstrndup(s, n);
 303         }
 304
 305         argv_array_push(&cmd, "checkout");
 306         if (force)
 307                 argv_array_push(&cmd, "--ignore-other-worktrees");
 308         if (new_branch)
 309                 argv_array_pushl(&cmd, "-b", new_branch, NULL);
 310         if (new_branch_force)
 311                 argv_array_pushl(&cmd, "-B", new_branch_force, NULL);
 312         if (detach)
 313                 argv_array_push(&cmd, "--detach");
 314         argv_array_push(&cmd, branch);
 315
 316         return add_worktree(path, cmd.argv);
 317 }
 318
 319 int cmd_worktree(int ac, const char **av, const char *prefix)
 320 {
 321         struct option options[] = {
 322                 OPT_END()
 323         };
 324
 325         if (ac < 2)
 326                 usage_with_options(worktree_usage, options);
 327         if (!strcmp(av[1], "add"))
 328                 return add(ac - 1, av + 1, prefix);
 329         if (!strcmp(av[1], "prune"))
 330                 return prune(ac - 1, av + 1, prefix);
 331         usage_with_options(worktree_usage, options);
 332 }