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
   9 static char const * const archive_usage[] = {
  10         "git archive [options] <tree-ish> [<path>...]",
  11         "git archive --list",
  12         "git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [<path>...]",
  13         "git archive --remote <repo> [--exec <cmd>] --list",
  14         NULL
  15 };
  16
  17 static const struct archiver **archivers;
  18 static int nr_archivers;
  19 static int alloc_archivers;
  20
  21 void register_archiver(struct archiver *ar)
  22 {
  23         ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  24         archivers[nr_archivers++] = ar;
  25 }
  26
  27 static void format_subst(const struct commit *commit,
  28                          const char *src, size_t len,
  29                          struct strbuf *buf)
  30 {
  31         char *to_free = NULL;
  32         struct strbuf fmt = STRBUF_INIT;
  33         struct pretty_print_context ctx = {0};
  34         ctx.date_mode = DATE_NORMAL;
  35         ctx.abbrev = DEFAULT_ABBREV;
  36
  37         if (src == buf->buf)
  38                 to_free = strbuf_detach(buf, NULL);
  39         for (;;) {
  40                 const char *b, *c;
  41
  42                 b = memmem(src, len, "$Format:", 8);
  43                 if (!b)
  44                         break;
  45                 c = memchr(b + 8, '$', (src + len) - b - 8);
  46                 if (!c)
  47                         break;
  48
  49                 strbuf_reset(&fmt);
  50                 strbuf_add(&fmt, b + 8, c - b - 8);
  51
  52                 strbuf_add(buf, src, b - src);
  53                 format_commit_message(commit, fmt.buf, buf, &ctx);
  54                 len -= c + 1 - src;
  55                 src  = c + 1;
  56         }
  57         strbuf_add(buf, src, len);
  58         strbuf_release(&fmt);
  59         free(to_free);
  60 }
  61
  62 void *sha1_file_to_archive(const struct archiver_args *args,
  63                            const char *path, const unsigned char *sha1,
  64                            unsigned int mode, enum object_type *type,
  65                            unsigned long *sizep)
  66 {
  67         void *buffer;
  68         const struct commit *commit = args->convert ? args->commit : NULL;
  69
  70         path += args->baselen;
  71         buffer = read_sha1_file(sha1, type, sizep);
  72         if (buffer && S_ISREG(mode)) {
  73                 struct strbuf buf = STRBUF_INIT;
  74                 size_t size = 0;
  75
  76                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  77                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  78                 if (commit)
  79                         format_subst(commit, buf.buf, buf.len, &buf);
  80                 buffer = strbuf_detach(&buf, &size);
  81                 *sizep = size;
  82         }
  83
  84         return buffer;
  85 }
  86
  87 static void setup_archive_check(struct git_attr_check *check)
  88 {
  89         static struct git_attr *attr_export_ignore;
  90         static struct git_attr *attr_export_subst;
  91
  92         if (!attr_export_ignore) {
  93                 attr_export_ignore = git_attr("export-ignore");
  94                 attr_export_subst = git_attr("export-subst");
  95         }
  96         check[0].attr = attr_export_ignore;
  97         check[1].attr = attr_export_subst;
  98 }
  99
 100 struct archiver_context {
 101         struct archiver_args *args;
 102         write_archive_entry_fn_t write_entry;
 103 };
 104
 105 static int write_archive_entry(const unsigned char *sha1, const char *base,
 106                 int baselen, const char *filename, unsigned mode, int stage,
 107                 void *context)
 108 {
 109         static struct strbuf path = STRBUF_INIT;
 110         struct archiver_context *c = context;
 111         struct archiver_args *args = c->args;
 112         write_archive_entry_fn_t write_entry = c->write_entry;
 113         struct git_attr_check check[2];
 114         const char *path_without_prefix;
 115         int err;
 116
 117         args->convert = 0;
 118         strbuf_reset(&path);
 119         strbuf_grow(&path, PATH_MAX);
 120         strbuf_add(&path, args->base, args->baselen);
 121         strbuf_add(&path, base, baselen);
 122         strbuf_addstr(&path, filename);
 123         path_without_prefix = path.buf + args->baselen;
 124
 125         setup_archive_check(check);
 126         if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 127                 if (ATTR_TRUE(check[0].value))
 128                         return 0;
 129                 args->convert = ATTR_TRUE(check[1].value);
 130         }
 131
 132         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 133                 strbuf_addch(&path, '/');
 134                 if (args->verbose)
 135                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 136                 err = write_entry(args, sha1, path.buf, path.len, mode);
 137                 if (err)
 138                         return err;
 139                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 140         }
 141
 142         if (args->verbose)
 143                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 144         return write_entry(args, sha1, path.buf, path.len, mode);
 145 }
 146
 147 int write_archive_entries(struct archiver_args *args,
 148                 write_archive_entry_fn_t write_entry)
 149 {
 150         struct archiver_context context;
 151         struct unpack_trees_options opts;
 152         struct tree_desc t;
 153         struct pathspec pathspec;
 154         int err;
 155
 156         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 157                 size_t len = args->baselen;
 158
 159                 while (len > 1 && args->base[len - 2] == '/')
 160                         len--;
 161                 if (args->verbose)
 162                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 163                 err = write_entry(args, args->tree->object.sha1, args->base,
 164                                   len, 040777);
 165                 if (err)
 166                         return err;
 167         }
 168
 169         context.args = args;
 170         context.write_entry = write_entry;
 171
 172         /*
 173          * Setup index and instruct attr to read index only
 174          */
 175         if (!args->worktree_attributes) {
 176                 memset(&opts, 0, sizeof(opts));
 177                 opts.index_only = 1;
 178                 opts.head_idx = -1;
 179                 opts.src_index = &the_index;
 180                 opts.dst_index = &the_index;
 181                 opts.fn = oneway_merge;
 182                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 183                 if (unpack_trees(1, &t, &opts))
 184                         return -1;
 185                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 186         }
 187
 188         init_pathspec(&pathspec, args->pathspec);
 189         err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
 190                                   write_archive_entry, &context);
 191         free_pathspec(&pathspec);
 192         if (err == READ_TREE_RECURSIVE)
 193                 err = 0;
 194         return err;
 195 }
 196
 197 static const struct archiver *lookup_archiver(const char *name)
 198 {
 199         int i;
 200
 201         if (!name)
 202                 return NULL;
 203
 204         for (i = 0; i < nr_archivers; i++) {
 205                 if (!strcmp(name, archivers[i]->name))
 206                         return archivers[i];
 207         }
 208         return NULL;
 209 }
 210
 211 static int reject_entry(const unsigned char *sha1, const char *base,
 212                         int baselen, const char *filename, unsigned mode,
 213                         int stage, void *context)
 214 {
 215         return -1;
 216 }
 217
 218 static int path_exists(struct tree *tree, const char *path)
 219 {
 220         const char *paths[] = { path, NULL };
 221         struct pathspec pathspec;
 222         int ret;
 223
 224         init_pathspec(&pathspec, paths);
 225         ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 226         free_pathspec(&pathspec);
 227         return ret != 0;
 228 }
 229
 230 static void parse_pathspec_arg(const char **pathspec,
 231                 struct archiver_args *ar_args)
 232 {
 233         ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 234         if (pathspec) {
 235                 while (*pathspec) {
 236                         if (!path_exists(ar_args->tree, *pathspec))
 237                                 die("path not found: %s", *pathspec);
 238                         pathspec++;
 239                 }
 240         }
 241 }
 242
 243 static void parse_treeish_arg(const char **argv,
 244                 struct archiver_args *ar_args, const char *prefix,
 245                 int remote)
 246 {
 247         const char *name = argv[0];
 248         const unsigned char *commit_sha1;
 249         time_t archive_time;
 250         struct tree *tree;
 251         const struct commit *commit;
 252         unsigned char sha1[20];
 253
 254         /* Remotes are only allowed to fetch actual refs */
 255         if (remote) {
 256                 char *ref = NULL;
 257                 const char *colon = strchr(name, ':');
 258                 int refnamelen = colon ? colon - name : strlen(name);
 259
 260                 if (!dwim_ref(name, refnamelen, sha1, &ref))
 261                         die("no such ref: %.*s", refnamelen, name);
 262                 free(ref);
 263         }
 264
 265         if (get_sha1(name, sha1))
 266                 die("Not a valid object name");
 267
 268         commit = lookup_commit_reference_gently(sha1, 1);
 269         if (commit) {
 270                 commit_sha1 = commit->object.sha1;
 271                 archive_time = commit->date;
 272         } else {
 273                 commit_sha1 = NULL;
 274                 archive_time = time(NULL);
 275         }
 276
 277         tree = parse_tree_indirect(sha1);
 278         if (tree == NULL)
 279                 die("not a tree object");
 280
 281         if (prefix) {
 282                 unsigned char tree_sha1[20];
 283                 unsigned int mode;
 284                 int err;
 285
 286                 err = get_tree_entry(tree->object.sha1, prefix,
 287                                      tree_sha1, &mode);
 288                 if (err || !S_ISDIR(mode))
 289                         die("current working directory is untracked");
 290
 291                 tree = parse_tree_indirect(tree_sha1);
 292         }
 293         ar_args->tree = tree;
 294         ar_args->commit_sha1 = commit_sha1;
 295         ar_args->commit = commit;
 296         ar_args->time = archive_time;
 297 }
 298
 299 #define OPT__COMPR(s, v, h, p) \
 300         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 301           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 302 #define OPT__COMPR_HIDDEN(s, v, p) \
 303         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 304           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 305
 306 static int parse_archive_args(int argc, const char **argv,
 307                 const struct archiver **ar, struct archiver_args *args,
 308                 const char *name_hint, int is_remote)
 309 {
 310         const char *format = NULL;
 311         const char *base = NULL;
 312         const char *remote = NULL;
 313         const char *exec = NULL;
 314         const char *output = NULL;
 315         int compression_level = -1;
 316         int verbose = 0;
 317         int i;
 318         int list = 0;
 319         int worktree_attributes = 0;
 320         struct option opts[] = {
 321                 OPT_GROUP(""),
 322                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 323                 OPT_STRING(0, "prefix", &base, "prefix",
 324                         "prepend prefix to each pathname in the archive"),
 325                 OPT_STRING('o', "output", &output, "file",
 326                         "write the archive to this file"),
 327                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 328                         "read .gitattributes in working directory"),
 329                 OPT__VERBOSE(&verbose, "report archived files on stderr"),
 330                 OPT__COMPR('0', &compression_level, "store only", 0),
 331                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 332                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 333                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 334                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 335                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 336                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 337                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 338                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 339                 OPT__COMPR('9', &compression_level, "compress better", 9),
 340                 OPT_GROUP(""),
 341                 OPT_BOOL('l', "list", &list,
 342                         "list supported archive formats"),
 343                 OPT_GROUP(""),
 344                 OPT_STRING(0, "remote", &remote, "repo",
 345                         "retrieve the archive from remote repository <repo>"),
 346                 OPT_STRING(0, "exec", &exec, "cmd",
 347                         "path to the remote git-upload-archive command"),
 348                 OPT_END()
 349         };
 350
 351         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 352
 353         if (remote)
 354                 die("Unexpected option --remote");
 355         if (exec)
 356                 die("Option --exec can only be used together with --remote");
 357         if (output)
 358                 die("Unexpected option --output");
 359
 360         if (!base)
 361                 base = "";
 362
 363         if (list) {
 364                 for (i = 0; i < nr_archivers; i++)
 365                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 366                                 printf("%s\n", archivers[i]->name);
 367                 exit(0);
 368         }
 369
 370         if (!format && name_hint)
 371                 format = archive_format_from_filename(name_hint);
 372         if (!format)
 373                 format = "tar";
 374
 375         /* We need at least one parameter -- tree-ish */
 376         if (argc < 1)
 377                 usage_with_options(archive_usage, opts);
 378         *ar = lookup_archiver(format);
 379         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 380                 die("Unknown archive format '%s'", format);
 381
 382         args->compression_level = Z_DEFAULT_COMPRESSION;
 383         if (compression_level != -1) {
 384                 if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 385                         args->compression_level = compression_level;
 386                 else {
 387                         die("Argument not supported for format '%s': -%d",
 388                                         format, compression_level);
 389                 }
 390         }
 391         args->verbose = verbose;
 392         args->base = base;
 393         args->baselen = strlen(base);
 394         args->worktree_attributes = worktree_attributes;
 395
 396         return argc;
 397 }
 398
 399 int write_archive(int argc, const char **argv, const char *prefix,
 400                   int setup_prefix, const char *name_hint, int remote)
 401 {
 402         int nongit = 0;
 403         const struct archiver *ar = NULL;
 404         struct archiver_args args;
 405
 406         if (setup_prefix && prefix == NULL)
 407                 prefix = setup_git_directory_gently(&nongit);
 408
 409         git_config(git_default_config, NULL);
 410         init_tar_archiver();
 411         init_zip_archiver();
 412
 413         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 414         if (nongit) {
 415                 /*
 416                  * We know this will die() with an error, so we could just
 417                  * die ourselves; but its error message will be more specific
 418                  * than what we could write here.
 419                  */
 420                 setup_git_directory();
 421         }
 422
 423         parse_treeish_arg(argv, &args, prefix, remote);
 424         parse_pathspec_arg(argv + 1, &args);
 425
 426         return ar->write_archive(ar, &args);
 427 }
 428
 429 static int match_extension(const char *filename, const char *ext)
 430 {
 431         int prefixlen = strlen(filename) - strlen(ext);
 432
 433         /*
 434          * We need 1 character for the '.', and 1 character to ensure that the
 435          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 436          * filename).
 437          */
 438         if (prefixlen < 2 || filename[prefixlen-1] != '.')
 439                 return 0;
 440         return !strcmp(filename + prefixlen, ext);
 441 }
 442
 443 const char *archive_format_from_filename(const char *filename)
 444 {
 445         int i;
 446
 447         for (i = 0; i < nr_archivers; i++)
 448                 if (match_extension(filename, archivers[i]->name))
 449                         return archivers[i]->name;
 450         return NULL;
 451 }