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