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 static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  63                 unsigned int mode, enum object_type *type,
  64                 unsigned long *sizep, const struct commit *commit)
  65 {
  66         void *buffer;
  67
  68         buffer = read_sha1_file(sha1, type, sizep);
  69         if (buffer && S_ISREG(mode)) {
  70                 struct strbuf buf = STRBUF_INIT;
  71                 size_t size = 0;
  72
  73                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  74                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  75                 if (commit)
  76                         format_subst(commit, buf.buf, buf.len, &buf);
  77                 buffer = strbuf_detach(&buf, &size);
  78                 *sizep = size;
  79         }
  80
  81         return buffer;
  82 }
  83
  84 static void setup_archive_check(struct git_attr_check *check)
  85 {
  86         static struct git_attr *attr_export_ignore;
  87         static struct git_attr *attr_export_subst;
  88
  89         if (!attr_export_ignore) {
  90                 attr_export_ignore = git_attr("export-ignore");
  91                 attr_export_subst = git_attr("export-subst");
  92         }
  93         check[0].attr = attr_export_ignore;
  94         check[1].attr = attr_export_subst;
  95 }
  96
  97 struct archiver_context {
  98         struct archiver_args *args;
  99         write_archive_entry_fn_t write_entry;
 100 };
 101
 102 static int write_archive_entry(const unsigned char *sha1, const char *base,
 103                 int baselen, const char *filename, unsigned mode, int stage,
 104                 void *context)
 105 {
 106         static struct strbuf path = STRBUF_INIT;
 107         struct archiver_context *c = context;
 108         struct archiver_args *args = c->args;
 109         write_archive_entry_fn_t write_entry = c->write_entry;
 110         struct git_attr_check check[2];
 111         const char *path_without_prefix;
 112         int convert = 0;
 113         int err;
 114         enum object_type type;
 115         unsigned long size;
 116         void *buffer;
 117
 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                 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, NULL, 0);
 137                 if (err)
 138                         return err;
 139                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 140         }
 141
 142         buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 143                         &type, &size, convert ? args->commit : NULL);
 144         if (!buffer)
 145                 return error("cannot read %s", sha1_to_hex(sha1));
 146         if (args->verbose)
 147                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 148         err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 149         free(buffer);
 150         return err;
 151 }
 152
 153 int write_archive_entries(struct archiver_args *args,
 154                 write_archive_entry_fn_t write_entry)
 155 {
 156         struct archiver_context context;
 157         struct unpack_trees_options opts;
 158         struct tree_desc t;
 159         struct pathspec pathspec;
 160         int err;
 161
 162         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 163                 size_t len = args->baselen;
 164
 165                 while (len > 1 && args->base[len - 2] == '/')
 166                         len--;
 167                 if (args->verbose)
 168                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 169                 err = write_entry(args, args->tree->object.sha1, args->base,
 170                                 len, 040777, NULL, 0);
 171                 if (err)
 172                         return err;
 173         }
 174
 175         context.args = args;
 176         context.write_entry = write_entry;
 177
 178         /*
 179          * Setup index and instruct attr to read index only
 180          */
 181         if (!args->worktree_attributes) {
 182                 memset(&opts, 0, sizeof(opts));
 183                 opts.index_only = 1;
 184                 opts.head_idx = -1;
 185                 opts.src_index = &the_index;
 186                 opts.dst_index = &the_index;
 187                 opts.fn = oneway_merge;
 188                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 189                 if (unpack_trees(1, &t, &opts))
 190                         return -1;
 191                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 192         }
 193
 194         init_pathspec(&pathspec, args->pathspec);
 195         err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
 196                                   write_archive_entry, &context);
 197         free_pathspec(&pathspec);
 198         if (err == READ_TREE_RECURSIVE)
 199                 err = 0;
 200         return err;
 201 }
 202
 203 static const struct archiver *lookup_archiver(const char *name)
 204 {
 205         int i;
 206
 207         if (!name)
 208                 return NULL;
 209
 210         for (i = 0; i < nr_archivers; i++) {
 211                 if (!strcmp(name, archivers[i]->name))
 212                         return archivers[i];
 213         }
 214         return NULL;
 215 }
 216
 217 static int reject_entry(const unsigned char *sha1, const char *base,
 218                         int baselen, const char *filename, unsigned mode,
 219                         int stage, void *context)
 220 {
 221         return -1;
 222 }
 223
 224 static int path_exists(struct tree *tree, const char *path)
 225 {
 226         const char *paths[] = { path, NULL };
 227         struct pathspec pathspec;
 228         int ret;
 229
 230         init_pathspec(&pathspec, paths);
 231         ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 232         free_pathspec(&pathspec);
 233         return ret != 0;
 234 }
 235
 236 static void parse_pathspec_arg(const char **pathspec,
 237                 struct archiver_args *ar_args)
 238 {
 239         ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 240         if (pathspec) {
 241                 while (*pathspec) {
 242                         if (!path_exists(ar_args->tree, *pathspec))
 243                                 die("path not found: %s", *pathspec);
 244                         pathspec++;
 245                 }
 246         }
 247 }
 248
 249 static void parse_treeish_arg(const char **argv,
 250                 struct archiver_args *ar_args, const char *prefix,
 251                 int remote)
 252 {
 253         const char *name = argv[0];
 254         const unsigned char *commit_sha1;
 255         time_t archive_time;
 256         struct tree *tree;
 257         const struct commit *commit;
 258         unsigned char sha1[20];
 259
 260         /* Remotes are only allowed to fetch actual refs */
 261         if (remote) {
 262                 char *ref = NULL;
 263                 if (!dwim_ref(name, strlen(name), sha1, &ref))
 264                         die("no such ref: %s", name);
 265                 free(ref);
 266         }
 267         else {
 268                 if (get_sha1(name, sha1))
 269                         die("Not a valid object name");
 270         }
 271
 272         commit = lookup_commit_reference_gently(sha1, 1);
 273         if (commit) {
 274                 commit_sha1 = commit->object.sha1;
 275                 archive_time = commit->date;
 276         } else {
 277                 commit_sha1 = NULL;
 278                 archive_time = time(NULL);
 279         }
 280
 281         tree = parse_tree_indirect(sha1);
 282         if (tree == NULL)
 283                 die("not a tree object");
 284
 285         if (prefix) {
 286                 unsigned char tree_sha1[20];
 287                 unsigned int mode;
 288                 int err;
 289
 290                 err = get_tree_entry(tree->object.sha1, prefix,
 291                                      tree_sha1, &mode);
 292                 if (err || !S_ISDIR(mode))
 293                         die("current working directory is untracked");
 294
 295                 tree = parse_tree_indirect(tree_sha1);
 296         }
 297         ar_args->tree = tree;
 298         ar_args->commit_sha1 = commit_sha1;
 299         ar_args->commit = commit;
 300         ar_args->time = archive_time;
 301 }
 302
 303 #define OPT__COMPR(s, v, h, p) \
 304         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 305           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 306 #define OPT__COMPR_HIDDEN(s, v, p) \
 307         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 308           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 309
 310 static int parse_archive_args(int argc, const char **argv,
 311                 const struct archiver **ar, struct archiver_args *args,
 312                 const char *name_hint, int is_remote)
 313 {
 314         const char *format = NULL;
 315         const char *base = NULL;
 316         const char *remote = NULL;
 317         const char *exec = NULL;
 318         const char *output = NULL;
 319         int compression_level = -1;
 320         int verbose = 0;
 321         int i;
 322         int list = 0;
 323         int worktree_attributes = 0;
 324         struct option opts[] = {
 325                 OPT_GROUP(""),
 326                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 327                 OPT_STRING(0, "prefix", &base, "prefix",
 328                         "prepend prefix to each pathname in the archive"),
 329                 OPT_STRING('o', "output", &output, "file",
 330                         "write the archive to this file"),
 331                 OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 332                         "read .gitattributes in working directory"),
 333                 OPT__VERBOSE(&verbose, "report archived files on stderr"),
 334                 OPT__COMPR('0', &compression_level, "store only", 0),
 335                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 336                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 337                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 338                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 339                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 340                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 341                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 342                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 343                 OPT__COMPR('9', &compression_level, "compress better", 9),
 344                 OPT_GROUP(""),
 345                 OPT_BOOL('l', "list", &list,
 346                         "list supported archive formats"),
 347                 OPT_GROUP(""),
 348                 OPT_STRING(0, "remote", &remote, "repo",
 349                         "retrieve the archive from remote repository <repo>"),
 350                 OPT_STRING(0, "exec", &exec, "cmd",
 351                         "path to the remote git-upload-archive command"),
 352                 OPT_END()
 353         };
 354
 355         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 356
 357         if (remote)
 358                 die("Unexpected option --remote");
 359         if (exec)
 360                 die("Option --exec can only be used together with --remote");
 361         if (output)
 362                 die("Unexpected option --output");
 363
 364         if (!base)
 365                 base = "";
 366
 367         if (list) {
 368                 for (i = 0; i < nr_archivers; i++)
 369                         if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 370                                 printf("%s\n", archivers[i]->name);
 371                 exit(0);
 372         }
 373
 374         if (!format && name_hint)
 375                 format = archive_format_from_filename(name_hint);
 376         if (!format)
 377                 format = "tar";
 378
 379         /* We need at least one parameter -- tree-ish */
 380         if (argc < 1)
 381                 usage_with_options(archive_usage, opts);
 382         *ar = lookup_archiver(format);
 383         if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 384                 die("Unknown archive format '%s'", format);
 385
 386         args->compression_level = Z_DEFAULT_COMPRESSION;
 387         if (compression_level != -1) {
 388                 if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 389                         args->compression_level = compression_level;
 390                 else {
 391                         die("Argument not supported for format '%s': -%d",
 392                                         format, compression_level);
 393                 }
 394         }
 395         args->verbose = verbose;
 396         args->base = base;
 397         args->baselen = strlen(base);
 398         args->worktree_attributes = worktree_attributes;
 399
 400         return argc;
 401 }
 402
 403 int write_archive(int argc, const char **argv, const char *prefix,
 404                   int setup_prefix, const char *name_hint, int remote)
 405 {
 406         int nongit = 0;
 407         const struct archiver *ar = NULL;
 408         struct archiver_args args;
 409
 410         if (setup_prefix && prefix == NULL)
 411                 prefix = setup_git_directory_gently(&nongit);
 412
 413         git_config(git_default_config, NULL);
 414         init_tar_archiver();
 415         init_zip_archiver();
 416
 417         argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 418         if (nongit) {
 419                 /*
 420                  * We know this will die() with an error, so we could just
 421                  * die ourselves; but its error message will be more specific
 422                  * than what we could write here.
 423                  */
 424                 setup_git_directory();
 425         }
 426
 427         parse_treeish_arg(argv, &args, prefix, remote);
 428         parse_pathspec_arg(argv + 1, &args);
 429
 430         return ar->write_archive(ar, &args);
 431 }
 432
 433 static int match_extension(const char *filename, const char *ext)
 434 {
 435         int prefixlen = strlen(filename) - strlen(ext);
 436
 437         /*
 438          * We need 1 character for the '.', and 1 character to ensure that the
 439          * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 440          * filename).
 441          */
 442         if (prefixlen < 2 || filename[prefixlen-1] != '.')
 443                 return 0;
 444         return !strcmp(filename + prefixlen, ext);
 445 }
 446
 447 const char *archive_format_from_filename(const char *filename)
 448 {
 449         int i;
 450
 451         for (i = 0; i < nr_archivers; i++)
 452                 if (match_extension(filename, archivers[i]->name))
 453                         return archivers[i]->name;
 454         return NULL;
 455 }