archive.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tree-walk.h"
   4 #include "attr.h"
   5 #include "archive.h"
   6 #include "parse-options.h"
   7 #include "unpack-trees.h"
   8 #include "dir.h"
   9
  10 static char const * const archive_usage[] = {
  11         N_("git archive [<options>] <tree-ish> [<path>...]"),
  12         N_("git archive --list"),
  13         N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  14         N_("git archive --remote <repo> [--exec <cmd>] --list"),
  15         NULL
  16 };
  17
  18 static const struct archiver **archivers;
  19 static int nr_archivers;
  20 static int alloc_archivers;
  21 static int remote_allow_unreachable;
  22
  23 void register_archiver(struct archiver *ar)
  24 {
  25         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  26         archivers[nr_archivers++] = ar;
  27 }
  28
  29 static void format_subst(const struct commit *commit,
  30                          const char *src, size_t len,
  31                          struct strbuf *buf)
  32 {
  33         char *to_free = NULL;
  34         struct strbuf fmt = STRBUF_INIT;
  35         struct pretty_print_context ctx = {0};
  36         ctx.date_mode = DATE_NORMAL;
  37         ctx.abbrev = DEFAULT_ABBREV;
  38
  39         if (src == buf->buf)
  40                 to_free = strbuf_detach(buf, NULL);
  41         for (;;) {
  42                 const char *b, *c;
  43
  44                 b = memmem(src, len, "$Format:", 8);
  45                 if (!b)
  46                         break;
  47                 c = memchr(b + 8, '$', (src + len) - b - 8);
  48                 if (!c)
  49                         break;
  50
  51                 strbuf_reset(&fmt);
  52                 strbuf_add(&fmt, b + 8, c - b - 8);
  53
  54                 strbuf_add(buf, src, b - src);
  55                 format_commit_message(commit, fmt.buf, buf, &ctx);
  56                 len -= c + 1 - src;
  57                 src  = c + 1;
  58         }
  59         strbuf_add(buf, src, len);
  60         strbuf_release(&fmt);
  61         free(to_free);
  62 }
  63
  64 void *sha1_file_to_archive(const struct archiver_args *args,
  65                            const char *path, const unsigned char *sha1,
  66                            unsigned int mode, enum object_type *type,
  67                            unsigned long *sizep)
  68 {
  69         void *buffer;
  70         const struct commit *commit = args->convert ? args->commit : NULL;
  71
  72         path += args->baselen;
  73         buffer = read_sha1_file(sha1, type, sizep);
  74         if (buffer && S_ISREG(mode)) {
  75                 struct strbuf buf = STRBUF_INIT;
  76                 size_t size = 0;
  77
  78                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  79                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  80                 if (commit)
  81                         format_subst(commit, buf.buf, buf.len, &buf);
  82                 buffer = strbuf_detach(&buf, &size);
  83                 *sizep = size;
  84         }
  85
  86         return buffer;
  87 }
  88
  89 static void setup_archive_check(struct git_attr_check *check)
  90 {
  91         static struct git_attr *attr_export_ignore;
  92         static struct git_attr *attr_export_subst;
  93
  94         if (!attr_export_ignore) {
  95                 attr_export_ignore = git_attr("export-ignore");
  96                 attr_export_subst = git_attr("export-subst");
  97         }
  98         check[0].attr = attr_export_ignore;
  99         check[1].attr = attr_export_subst;
 100 }
 101
 102 struct directory {
 103         struct directory *up;
 104         struct object_id oid;
 105         int baselen, len;
 106         unsigned mode;
 107         int stage;
 108         char path[FLEX_ARRAY];
 109 };
 110
 111 struct archiver_context {
 112         struct archiver_args *args;
 113         write_archive_entry_fn_t write_entry;
 114         struct directory *bottom;
 115 };
 116
 117 static int write_archive_entry(const unsigned char *sha1, const char *base,
 118                 int baselen, const char *filename, unsigned mode, int stage,
 119                 void *context)
 120 {
 121         static struct strbuf path = STRBUF_INIT;
 122         struct archiver_context *c = context;
 123         struct archiver_args *args = c->args;
 124         write_archive_entry_fn_t write_entry = c->write_entry;
 125         struct git_attr_check check[2];
 126         const char *path_without_prefix;
 127         int err;
 128
 129         args->convert = 0;
 130         strbuf_reset(&path);
 131         strbuf_grow(&path, PATH_MAX);
 132         strbuf_add(&path, args->base, args->baselen);
 133         strbuf_add(&path, base, baselen);
 134         strbuf_addstr(&path, filename);
 135         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 136                 strbuf_addch(&path, '/');
 137         path_without_prefix = path.buf + args->baselen;
 138
 139         setup_archive_check(check);
 140         if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 141                 if (ATTR_TRUE(check[0].value))
 142                         return 0;
 143                 args->convert = ATTR_TRUE(check[1].value);
 144         }
 145
 146         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 147                 if (args->verbose)
 148                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 149                 err = write_entry(args, sha1, path.buf, path.len, mode);
 150                 if (err)
 151                         return err;
 152                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 153         }
 154
 155         if (args->verbose)
 156                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 157         return write_entry(args, sha1, path.buf, path.len, mode);
 158 }
 159
 160 static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,
 161                 const char *filename, unsigned mode, int stage,
 162                 void *context)
 163 {
 164         return write_archive_entry(sha1, base->buf, base->len,
 165                                      filename, mode, stage, context);
 166 }
 167
 168 static void queue_directory(const unsigned char *sha1,
 169                 struct strbuf *base, const char *filename,
 170                 unsigned mode, int stage, struct archiver_context *c)
 171 {
 172         struct directory *d;
 173         d = xmallocz(sizeof(*d) + base->len + 1 + strlen(filename));
 174         d->up      = c->bottom;
 175         d->baselen = base->len;
 176         d->mode    = mode;
 177         d->stage   = stage;
 178         c->bottom  = d;
 179         d->len = sprintf(d->path, "%.*s%s/", (int)base->len, base->buf, filename);
 180         hashcpy(d->oid.hash, sha1);
 181 }
 182
 183 static int write_directory(struct archiver_context *c)
 184 {
 185         struct directory *d = c->bottom;
 186         int ret;
 187
 188         if (!d)
 189                 return 0;
 190         c->bottom = d->up;
 191         d->path[d->len - 1] = '\0'; /* no trailing slash */
 192         ret =
 193                 write_directory(c) ||
 194                 write_archive_entry(d->oid.hash, d->path, d->baselen,
 195                                     d->path + d->baselen, d->mode,
 196                                     d->stage, c) != READ_TREE_RECURSIVE;
 197         free(d);
 198         return ret ? -1 : 0;
 199 }
 200
 201 static int queue_or_write_archive_entry(const unsigned char *sha1,
 202                 struct strbuf *base, const char *filename,
 203                 unsigned mode, int stage, void *context)
 204 {
 205         struct archiver_context *c = context;
 206
 207         while (c->bottom &&
 208                !(base->len >= c->bottom->len &&
 209                  !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 210                 struct directory *next = c->bottom->up;
 211                 free(c->bottom);
 212                 c->bottom = next;
 213         }
 214
 215         if (S_ISDIR(mode)) {
 216                 queue_directory(sha1, base, filename,
 217                                 mode, stage, c);
 218                 return READ_TREE_RECURSIVE;
 219         }
 220
 221         if (write_directory(c))
 222                 return -1;
 223         return write_archive_entry(sha1, base->buf, base->len, filename, mode,
 224                                    stage, context);
 225 }
 226
 227 int write_archive_entries(struct archiver_args *args,
 228                 write_archive_entry_fn_t write_entry)
 229 {
 230         struct archiver_context context;
 231         struct unpack_trees_options opts;
 232         struct tree_desc t;
 233         int err;
 234
 235         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 236                 size_t len = args->baselen;
 237
 238                 while (len > 1 && args->base[len - 2] == '/')
 239                         len--;
 240                 if (args->verbose)
 241                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 242                 err = write_entry(args, args->tree->object.sha1, args->base,
 243                                   len, 040777);
 244                 if (err)
 245                         return err;
 246         }
 247
 248         memset(&context, 0, sizeof(context));
 249         context.args = args;
 250         context.write_entry = write_entry;
 251
 252         /*
 253          * Setup index and instruct attr to read index only
 254          */
 255         if (!args->worktree_attributes) {
 256                 memset(&opts, 0, sizeof(opts));
 257                 opts.index_only = 1;
 258                 opts.head_idx = -1;
 259                 opts.src_index = &the_index;
 260                 opts.dst_index = &the_index;
 261                 opts.fn = oneway_merge;
 262                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 263                 if (unpack_trees(1, &t, &opts))
 264                         return -1;
 265                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 266         }
 267
 268         err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 269                                   args->pathspec.has_wildcard ?
 270                                   queue_or_write_archive_entry :
 271                                   write_archive_entry_buf,
 272                                   &context);
 273         if (err == READ_TREE_RECURSIVE)
 274                 err = 0;
 275         while (context.bottom) {
 276                 struct directory *next = context.bottom->up;
 277                 free(context.bottom);
 278                 context.bottom = next;
 279         }
 280         return err;
 281 }
 282
 283 static const struct archiver *lookup_archiver(const char *name)
 284 {
 285         int i;
 286
 287         if (!name)
 288                 return NULL;
 289
 290         for (i = 0; i < nr_archivers; i++) {
 291                 if (!strcmp(name, archivers[i]->name))
 292                         return archivers[i];
 293         }
 294         return NULL;
 295 }
 296
 297 static int reject_entry(const unsigned char *sha1, struct strbuf *base,
 298                         const char *filename, unsigned mode,
 299                         int stage, void *context)
 300 {
 301         int ret = -1;
 302         if (S_ISDIR(mode)) {
 303                 struct strbuf sb = STRBUF_INIT;
 304                 strbuf_addbuf(&sb, base);
 305                 strbuf_addstr(&sb, filename);
 306                 if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
 307                         ret = READ_TREE_RECURSIVE;
 308                 strbuf_release(&sb);
 309         }
 310         return ret;
 311 }
 312
 313 static int path_exists(struct tree *tree, const char *path)
 314 {
 315         const char *paths[] = { path, NULL };
 316         struct pathspec pathspec;
 317         int ret;
 318
 319         parse_pathspec(&pathspec, 0, 0, "", paths);
 320         pathspec.recursive = 1;
 321         ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
 322                                   reject_entry, &pathspec);
 323         free_pathspec(&pathspec);
 324         return ret != 0;
 325 }
 326
 327 static void parse_pathspec_arg(const char **pathspec,
 328                 struct archiver_args *ar_args)
 329 {
 330         /*
 331          * must be consistent with parse_pathspec in path_exists()
 332          * Also if pathspec patterns are dependent, we're in big
 333          * trouble as we test each one separately
 334          */
 335         parse_pathspec(&ar_args->pathspec, 0,
 336                        PATHSPEC_PREFER_FULL,
 337                        "", pathspec);
 338         ar_args->pathspec.recursive = 1;
 339         if (pathspec) {
 340                 while (*pathspec) {
 341                         if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 342                                 die(_("pathspec '%s' did not match any files"), *pathspec);
 343                         pathspec++;
 344                 }
 345         }
 346 }
 347
 348 static void parse_treeish_arg(const char **argv,
 349                 struct archiver_args *ar_args, const char *prefix,
 350                 int remote)
 351 {
 352         const char *name = argv[0];
 353         const unsigned char *commit_sha1;
 354         time_t archive_time;
 355         struct tree *tree;
 356         const struct commit *commit;
 357         struct object_id oid;
 358
 359         /* Remotes are only allowed to fetch actual refs */
 360         if (remote && !remote_allow_unreachable) {
 361                 char *ref = NULL;
 362                 const char *colon = strchrnul(name, ':');
 363                 int refnamelen = colon - name;
 364
 365                 if (!dwim_ref(name, refnamelen, oid.hash, &ref))
 366                         die("no such ref: %.*s", refnamelen, name);
 367                 free(ref);
 368         }
 369
 370         if (get_sha1(name, oid.hash))
 371                 die("Not a valid object name");
 372
 373         commit = lookup_commit_reference_gently(oid.hash, 1);
 374         if (commit) {
 375                 commit_sha1 = commit->object.sha1;
 376                 archive_time = commit->date;
 377         } else {
 378                 commit_sha1 = NULL;
 379                 archive_time = time(NULL);
 380         }
 381
 382         tree = parse_tree_indirect(oid.hash);
 383         if (tree == NULL)
 384                 die("not a tree object");
 385
 386         if (prefix) {
 387                 struct object_id tree_oid;
 388                 unsigned int mode;
 389                 int err;
 390
 391                 err = get_tree_entry(tree->object.sha1, prefix,
 392                                      tree_oid.hash, &mode);
 393                 if (err || !S_ISDIR(mode))
 394                         die("current working directory is untracked");
 395
 396                 tree = parse_tree_indirect(tree_oid.hash);
 397         }
 398         ar_args->tree = tree;
 399         ar_args->commit_sha1 = commit_sha1;
 400         ar_args->commit = commit;
 401         ar_args->time = archive_time;
 402 }
 403
 404 #define OPT__COMPR(s, v, h, p) \
 405         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 406           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 407 #define OPT__COMPR_HIDDEN(s, v, p) \
 408         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 409           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 410
 411 static int parse_archive_args(int argc, const char **argv,
 412                 const struct archiver **ar, struct archiver_args *args,
 413                 const char *name_hint, int is_remote)
 414 {
 415         const char *format = NULL;
 416         const char *base = NULL;
 417         const char *remote = NULL;
 418         const char *exec = NULL;
 419         const char *output = NULL;
 420         int compression_level = -1;
 421         int verbose = 0;
 422         int i;
 423         int list = 0;
 424         int worktree_attributes = 0;
 425         struct option opts[] = {
 426                 OPT_GROUP(""),
 427                 OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 428                 OPT_STRING(0, "prefix", &base, N_("prefix"),
 429                         N_("prepend prefix to each pathname in the archive")),
 430                 OPT_STRING('o', "output", &output, N_("file"),
 431                         N_("write the archive to this file")),
 432                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 433                         N_("read .gitattributes in working directory")),
 434                 OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 435                 OPT__COMPR('0', &compression_level, N_("store only"), 0),
 436                 OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 437                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 438                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 439                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 440                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 441                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 442                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 443                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 444                 OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 445                 OPT_GROUP(""),
 446                 OPT_BOOL('l', "list", &list,
 447                         N_("list supported archive formats")),
 448                 OPT_GROUP(""),
 449                 OPT_STRING(0, "remote", &remote, N_("repo"),
 450                         N_("retrieve the archive from remote repository <repo>")),
 451                 OPT_STRING(0, "exec", &exec, N_("command"),
 452                         N_("path to the remote git-upload-archive command")),
 453                 OPT_END()
 454         };
 455
 456         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 457
 458         if (remote)
 459                 die("Unexpected option --remote");
 460         if (exec)
 461                 die("Option --exec can only be used together with --remote");
 462         if (output)
 463                 die("Unexpected option --output");
 464
 465         if (!base)
 466                 base = "";
 467
 468         if (list) {
 469                 for (i = 0; i < nr_archivers; i++)
 470                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 471                                 printf("%s\n", archivers[i]->name);
 472                 exit(0);
 473         }
 474
 475         if (!format && name_hint)
 476                 format = archive_format_from_filename(name_hint);
 477         if (!format)
 478                 format = "tar";
 479
 480         /* We need at least one parameter -- tree-ish */
 481         if (argc < 1)
 482                 usage_with_options(archive_usage, opts);
 483         *ar = lookup_archiver(format);
 484         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 485                 die("Unknown archive format '%s'", format);
 486
 487         args->compression_level = Z_DEFAULT_COMPRESSION;
 488         if (compression_level != -1) {
 489                 if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 490                         args->compression_level = compression_level;
 491                 else {
 492                         die("Argument not supported for format '%s': -%d",
 493                                         format, compression_level);
 494                 }
 495         }
 496         args->verbose = verbose;
 497         args->base = base;
 498         args->baselen = strlen(base);
 499         args->worktree_attributes = worktree_attributes;
 500
 501         return argc;
 502 }
 503
 504 int write_archive(int argc, const char **argv, const char *prefix,
 505                   int setup_prefix, const char *name_hint, int remote)
 506 {
 507         int nongit = 0;
 508         const struct archiver *ar = NULL;
 509         struct archiver_args args;
 510
 511         if (setup_prefix && prefix == NULL)
 512                 prefix = setup_git_directory_gently(&nongit);
 513
 514         git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 515         git_config(git_default_config, NULL);
 516
 517         init_tar_archiver();
 518         init_zip_archiver();
 519
 520         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 521         if (nongit) {
 522                 /*
 523                  * We know this will die() with an error, so we could just
 524                  * die ourselves; but its error message will be more specific
 525                  * than what we could write here.
 526                  */
 527                 setup_git_directory();
 528         }
 529
 530         parse_treeish_arg(argv, &args, prefix, remote);
 531         parse_pathspec_arg(argv + 1, &args);
 532
 533         return ar->write_archive(ar, &args);
 534 }
 535
 536 static int match_extension(const char *filename, const char *ext)
 537 {
 538         int prefixlen = strlen(filename) - strlen(ext);
 539
 540         /*
 541          * We need 1 character for the '.', and 1 character to ensure that the
 542          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 543          * filename).
 544          */
 545         if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 546                 return 0;
 547         return !strcmp(filename + prefixlen, ext);
 548 }
 549
 550 const char *archive_format_from_filename(const char *filename)
 551 {
 552         int i;
 553
 554         for (i = 0; i < nr_archivers; i++)
 555                 if (match_extension(filename, archivers[i]->name))
 556                         return archivers[i]->name;
 557         return NULL;
 558 }