Andrew's git / gitweb.git / builtin/worktree.c
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builtin / worktree.con commit Merge branch 'jh/strbuf-read-use-read-in-full' (3b281d1)
   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
  12static const char * const worktree_usage[] = {
  13        N_("git worktree add [<options>] <path> <branch>"),
  14        N_("git worktree prune [<options>]"),
  15        NULL
  16};
  17
  18struct add_opts {
  19        int force;
  20        int detach;
  21        const char *new_branch;
  22        int force_new_branch;
  23};
  24
  25static int show_only;
  26static int verbose;
  27static unsigned long expire;
  28
  29static int prune_worktree(const char *id, struct strbuf *reason)
  30{
  31        struct stat st;
  32        char *path;
  33        int fd, len;
  34
  35        if (!is_directory(git_path("worktrees/%s", id))) {
  36                strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  37                return 1;
  38        }
  39        if (file_exists(git_path("worktrees/%s/locked", id)))
  40                return 0;
  41        if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  42                strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  43                return 1;
  44        }
  45        fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  46        if (fd < 0) {
  47                strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  48                            id, strerror(errno));
  49                return 1;
  50        }
  51        len = st.st_size;
  52        path = xmalloc(len + 1);
  53        read_in_full(fd, path, len);
  54        close(fd);
  55        while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  56                len--;
  57        if (!len) {
  58                strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  59                free(path);
  60                return 1;
  61        }
  62        path[len] = '\0';
  63        if (!file_exists(path)) {
  64                struct stat st_link;
  65                free(path);
  66                /*
  67                 * the repo is moved manually and has not been
  68                 * accessed since?
  69                 */
  70                if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
  71                    st_link.st_nlink > 1)
  72                        return 0;
  73                if (st.st_mtime <= expire) {
  74                        strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
  75                        return 1;
  76                } else {
  77                        return 0;
  78                }
  79        }
  80        free(path);
  81        return 0;
  82}
  83
  84static void prune_worktrees(void)
  85{
  86        struct strbuf reason = STRBUF_INIT;
  87        struct strbuf path = STRBUF_INIT;
  88        DIR *dir = opendir(git_path("worktrees"));
  89        struct dirent *d;
  90        int ret;
  91        if (!dir)
  92                return;
  93        while ((d = readdir(dir)) != NULL) {
  94                if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
  95                        continue;
  96                strbuf_reset(&reason);
  97                if (!prune_worktree(d->d_name, &reason))
  98                        continue;
  99                if (show_only || verbose)
 100                        printf("%s\n", reason.buf);
 101                if (show_only)
 102                        continue;
 103                strbuf_reset(&path);
 104                strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
 105                ret = remove_dir_recursively(&path, 0);
 106                if (ret < 0 && errno == ENOTDIR)
 107                        ret = unlink(path.buf);
 108                if (ret)
 109                        error(_("failed to remove: %s"), strerror(errno));
 110        }
 111        closedir(dir);
 112        if (!show_only)
 113                rmdir(git_path("worktrees"));
 114        strbuf_release(&reason);
 115        strbuf_release(&path);
 116}
 117
 118static int prune(int ac, const char **av, const char *prefix)
 119{
 120        struct option options[] = {
 121                OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 122                OPT__VERBOSE(&verbose, N_("report pruned objects")),
 123                OPT_EXPIRY_DATE(0, "expire", &expire,
 124                                N_("expire objects older than <time>")),
 125                OPT_END()
 126        };
 127
 128        expire = ULONG_MAX;
 129        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 130        if (ac)
 131                usage_with_options(worktree_usage, options);
 132        prune_worktrees();
 133        return 0;
 134}
 135
 136static char *junk_work_tree;
 137static char *junk_git_dir;
 138static int is_junk;
 139static pid_t junk_pid;
 140
 141static void remove_junk(void)
 142{
 143        struct strbuf sb = STRBUF_INIT;
 144        if (!is_junk || getpid() != junk_pid)
 145                return;
 146        if (junk_git_dir) {
 147                strbuf_addstr(&sb, junk_git_dir);
 148                remove_dir_recursively(&sb, 0);
 149                strbuf_reset(&sb);
 150        }
 151        if (junk_work_tree) {
 152                strbuf_addstr(&sb, junk_work_tree);
 153                remove_dir_recursively(&sb, 0);
 154        }
 155        strbuf_release(&sb);
 156}
 157
 158static void remove_junk_on_signal(int signo)
 159{
 160        remove_junk();
 161        sigchain_pop(signo);
 162        raise(signo);
 163}
 164
 165static const char *worktree_basename(const char *path, int *olen)
 166{
 167        const char *name;
 168        int len;
 169
 170        len = strlen(path);
 171        while (len && is_dir_sep(path[len - 1]))
 172                len--;
 173
 174        for (name = path + len - 1; name > path; name--)
 175                if (is_dir_sep(*name)) {
 176                        name++;
 177                        break;
 178                }
 179
 180        *olen = len;
 181        return name;
 182}
 183
 184static int add_worktree(const char *path, const char *refname,
 185                        const struct add_opts *opts)
 186{
 187        struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 188        struct strbuf sb = STRBUF_INIT;
 189        const char *name;
 190        struct stat st;
 191        struct child_process cp;
 192        struct argv_array child_env = ARGV_ARRAY_INIT;
 193        int counter = 0, len, ret;
 194        struct strbuf symref = STRBUF_INIT;
 195        struct commit *commit = NULL;
 196
 197        if (file_exists(path) && !is_empty_dir(path))
 198                die(_("'%s' already exists"), path);
 199
 200        /* is 'refname' a branch or commit? */
 201        if (opts->force_new_branch) /* definitely a branch */
 202                ;
 203        else if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 204                 ref_exists(symref.buf)) { /* it's a branch */
 205                if (!opts->force)
 206                        die_if_checked_out(symref.buf);
 207        } else { /* must be a commit */
 208                commit = lookup_commit_reference_by_name(refname);
 209                if (!commit)
 210                        die(_("invalid reference: %s"), refname);
 211        }
 212
 213        name = worktree_basename(path, &len);
 214        strbuf_addstr(&sb_repo,
 215                      git_path("worktrees/%.*s", (int)(path + len - name), name));
 216        len = sb_repo.len;
 217        if (safe_create_leading_directories_const(sb_repo.buf))
 218                die_errno(_("could not create leading directories of '%s'"),
 219                          sb_repo.buf);
 220        while (!stat(sb_repo.buf, &st)) {
 221                counter++;
 222                strbuf_setlen(&sb_repo, len);
 223                strbuf_addf(&sb_repo, "%d", counter);
 224        }
 225        name = strrchr(sb_repo.buf, '/') + 1;
 226
 227        junk_pid = getpid();
 228        atexit(remove_junk);
 229        sigchain_push_common(remove_junk_on_signal);
 230
 231        if (mkdir(sb_repo.buf, 0777))
 232                die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 233        junk_git_dir = xstrdup(sb_repo.buf);
 234        is_junk = 1;
 235
 236        /*
 237         * lock the incomplete repo so prune won't delete it, unlock
 238         * after the preparation is over.
 239         */
 240        strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 241        write_file(sb.buf, 1, "initializing\n");
 242
 243        strbuf_addf(&sb_git, "%s/.git", path);
 244        if (safe_create_leading_directories_const(sb_git.buf))
 245                die_errno(_("could not create leading directories of '%s'"),
 246                          sb_git.buf);
 247        junk_work_tree = xstrdup(path);
 248
 249        strbuf_reset(&sb);
 250        strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 251        write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
 252        write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
 253                   real_path(get_git_common_dir()), name);
 254        /*
 255         * This is to keep resolve_ref() happy. We need a valid HEAD
 256         * or is_git_directory() will reject the directory. Any value which
 257         * looks like an object ID will do since it will be immediately
 258         * replaced by the symbolic-ref or update-ref invocation in the new
 259         * worktree.
 260         */
 261        strbuf_reset(&sb);
 262        strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 263        write_file(sb.buf, 1, "0000000000000000000000000000000000000000\n");
 264        strbuf_reset(&sb);
 265        strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 266        write_file(sb.buf, 1, "../..\n");
 267
 268        fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 269
 270        argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 271        argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 272        memset(&cp, 0, sizeof(cp));
 273        cp.git_cmd = 1;
 274
 275        if (commit)
 276                argv_array_pushl(&cp.args, "update-ref", "HEAD",
 277                                 sha1_to_hex(commit->object.sha1), NULL);
 278        else
 279                argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 280                                 symref.buf, NULL);
 281        cp.env = child_env.argv;
 282        ret = run_command(&cp);
 283        if (ret)
 284                goto done;
 285
 286        cp.argv = NULL;
 287        argv_array_clear(&cp.args);
 288        argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 289        cp.env = child_env.argv;
 290        ret = run_command(&cp);
 291        if (!ret) {
 292                is_junk = 0;
 293                free(junk_work_tree);
 294                free(junk_git_dir);
 295                junk_work_tree = NULL;
 296                junk_git_dir = NULL;
 297        }
 298done:
 299        strbuf_reset(&sb);
 300        strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 301        unlink_or_warn(sb.buf);
 302        argv_array_clear(&child_env);
 303        strbuf_release(&sb);
 304        strbuf_release(&symref);
 305        strbuf_release(&sb_repo);
 306        strbuf_release(&sb_git);
 307        return ret;
 308}
 309
 310static int add(int ac, const char **av, const char *prefix)
 311{
 312        struct add_opts opts;
 313        const char *new_branch_force = NULL;
 314        const char *path, *branch;
 315        struct option options[] = {
 316                OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
 317                OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 318                           N_("create a new branch")),
 319                OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 320                           N_("create or reset a branch")),
 321                OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 322                OPT_END()
 323        };
 324
 325        memset(&opts, 0, sizeof(opts));
 326        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 327        if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 328                die(_("-b, -B, and --detach are mutually exclusive"));
 329        if (ac < 1 || ac > 2)
 330                usage_with_options(worktree_usage, options);
 331
 332        path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
 333        branch = ac < 2 ? "HEAD" : av[1];
 334
 335        opts.force_new_branch = !!new_branch_force;
 336        if (opts.force_new_branch)
 337                opts.new_branch = new_branch_force;
 338
 339        if (ac < 2 && !opts.new_branch && !opts.detach) {
 340                int n;
 341                const char *s = worktree_basename(path, &n);
 342                opts.new_branch = xstrndup(s, n);
 343        }
 344
 345        if (opts.new_branch) {
 346                struct child_process cp;
 347                memset(&cp, 0, sizeof(cp));
 348                cp.git_cmd = 1;
 349                argv_array_push(&cp.args, "branch");
 350                if (opts.force_new_branch)
 351                        argv_array_push(&cp.args, "--force");
 352                argv_array_push(&cp.args, opts.new_branch);
 353                argv_array_push(&cp.args, branch);
 354                if (run_command(&cp))
 355                        return -1;
 356                branch = opts.new_branch;
 357        }
 358
 359        return add_worktree(path, branch, &opts);
 360}
 361
 362int cmd_worktree(int ac, const char **av, const char *prefix)
 363{
 364        struct option options[] = {
 365                OPT_END()
 366        };
 367
 368        if (ac < 2)
 369                usage_with_options(worktree_usage, options);
 370        if (!strcmp(av[1], "add"))
 371                return add(ac - 1, av + 1, prefix);
 372        if (!strcmp(av[1], "prune"))
 373                return prune(ac - 1, av + 1, prefix);
 374        usage_with_options(worktree_usage, options);
 375}