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 #define USES_ZLIB_COMPRESSION 1
  18
  19 static const struct archiver {
  20         const char *name;
  21         write_archive_fn_t write_archive;
  22         unsigned int flags;
  23 } archivers[] = {
  24         { "tar", write_tar_archive },
  25         { "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
  26 };
  27
  28 static void format_subst(const struct commit *commit,
  29                          const char *src, size_t len,
  30                          struct strbuf *buf)
  31 {
  32         char *to_free = NULL;
  33         struct strbuf fmt = STRBUF_INIT;
  34         struct pretty_print_context ctx = {0};
  35         ctx.date_mode = DATE_NORMAL;
  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", 13);
  91                 attr_export_subst = git_attr("export-subst", 12);
  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_checkattr(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         int err;
 160
 161         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 162                 size_t len = args->baselen;
 163
 164                 while (len > 1 && args->base[len - 2] == '/')
 165                         len--;
 166                 if (args->verbose)
 167                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 168                 err = write_entry(args, args->tree->object.sha1, args->base,
 169                                 len, 040777, NULL, 0);
 170                 if (err)
 171                         return err;
 172         }
 173
 174         context.args = args;
 175         context.write_entry = write_entry;
 176
 177         /*
 178          * Setup index and instruct attr to read index only
 179          */
 180         if (!args->worktree_attributes) {
 181                 memset(&opts, 0, sizeof(opts));
 182                 opts.index_only = 1;
 183                 opts.head_idx = -1;
 184                 opts.src_index = &the_index;
 185                 opts.dst_index = &the_index;
 186                 opts.fn = oneway_merge;
 187                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 188                 if (unpack_trees(1, &t, &opts))
 189                         return -1;
 190                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 191         }
 192
 193         err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec,
 194                                   write_archive_entry, &context);
 195         if (err == READ_TREE_RECURSIVE)
 196                 err = 0;
 197         return err;
 198 }
 199
 200 static const struct archiver *lookup_archiver(const char *name)
 201 {
 202         int i;
 203
 204         if (!name)
 205                 return NULL;
 206
 207         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 208                 if (!strcmp(name, archivers[i].name))
 209                         return &archivers[i];
 210         }
 211         return NULL;
 212 }
 213
 214 static int reject_entry(const unsigned char *sha1, const char *base,
 215                         int baselen, const char *filename, unsigned mode,
 216                         int stage, void *context)
 217 {
 218         return -1;
 219 }
 220
 221 static int path_exists(struct tree *tree, const char *path)
 222 {
 223         const char *pathspec[] = { path, NULL };
 224
 225         if (read_tree_recursive(tree, "", 0, 0, pathspec, reject_entry, NULL))
 226                 return 1;
 227         return 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 {
 246         const char *name = argv[0];
 247         const unsigned char *commit_sha1;
 248         time_t archive_time;
 249         struct tree *tree;
 250         const struct commit *commit;
 251         unsigned char sha1[20];
 252
 253         if (get_sha1(name, sha1))
 254                 die("Not a valid object name");
 255
 256         commit = lookup_commit_reference_gently(sha1, 1);
 257         if (commit) {
 258                 commit_sha1 = commit->object.sha1;
 259                 archive_time = commit->date;
 260         } else {
 261                 commit_sha1 = NULL;
 262                 archive_time = time(NULL);
 263         }
 264
 265         tree = parse_tree_indirect(sha1);
 266         if (tree == NULL)
 267                 die("not a tree object");
 268
 269         if (prefix) {
 270                 unsigned char tree_sha1[20];
 271                 unsigned int mode;
 272                 int err;
 273
 274                 err = get_tree_entry(tree->object.sha1, prefix,
 275                                      tree_sha1, &mode);
 276                 if (err || !S_ISDIR(mode))
 277                         die("current working directory is untracked");
 278
 279                 tree = parse_tree_indirect(tree_sha1);
 280         }
 281         ar_args->tree = tree;
 282         ar_args->commit_sha1 = commit_sha1;
 283         ar_args->commit = commit;
 284         ar_args->time = archive_time;
 285 }
 286
 287 #define OPT__COMPR(s, v, h, p) \
 288         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 289           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 290 #define OPT__COMPR_HIDDEN(s, v, p) \
 291         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 292           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 293
 294 static int parse_archive_args(int argc, const char **argv,
 295                 const struct archiver **ar, struct archiver_args *args)
 296 {
 297         const char *format = "tar";
 298         const char *base = NULL;
 299         const char *remote = NULL;
 300         const char *exec = NULL;
 301         const char *output = NULL;
 302         int compression_level = -1;
 303         int verbose = 0;
 304         int i;
 305         int list = 0;
 306         int worktree_attributes = 0;
 307         struct option opts[] = {
 308                 OPT_GROUP(""),
 309                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 310                 OPT_STRING(0, "prefix", &base, "prefix",
 311                         "prepend prefix to each pathname in the archive"),
 312                 OPT_STRING('o', "output", &output, "file",
 313                         "write the archive to this file"),
 314                 OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
 315                         "read .gitattributes in working directory"),
 316                 OPT__VERBOSE(&verbose),
 317                 OPT__COMPR('0', &compression_level, "store only", 0),
 318                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 319                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 320                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 321                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 322                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 323                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 324                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 325                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 326                 OPT__COMPR('9', &compression_level, "compress better", 9),
 327                 OPT_GROUP(""),
 328                 OPT_BOOLEAN('l', "list", &list,
 329                         "list supported archive formats"),
 330                 OPT_GROUP(""),
 331                 OPT_STRING(0, "remote", &remote, "repo",
 332                         "retrieve the archive from remote repository <repo>"),
 333                 OPT_STRING(0, "exec", &exec, "cmd",
 334                         "path to the remote git-upload-archive command"),
 335                 OPT_END()
 336         };
 337
 338         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 339
 340         if (remote)
 341                 die("Unexpected option --remote");
 342         if (exec)
 343                 die("Option --exec can only be used together with --remote");
 344         if (output)
 345                 die("Unexpected option --output");
 346
 347         if (!base)
 348                 base = "";
 349
 350         if (list) {
 351                 for (i = 0; i < ARRAY_SIZE(archivers); i++)
 352                         printf("%s\n", archivers[i].name);
 353                 exit(0);
 354         }
 355
 356         /* We need at least one parameter -- tree-ish */
 357         if (argc < 1)
 358                 usage_with_options(archive_usage, opts);
 359         *ar = lookup_archiver(format);
 360         if (!*ar)
 361                 die("Unknown archive format '%s'", format);
 362
 363         args->compression_level = Z_DEFAULT_COMPRESSION;
 364         if (compression_level != -1) {
 365                 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 366                         args->compression_level = compression_level;
 367                 else {
 368                         die("Argument not supported for format '%s': -%d",
 369                                         format, compression_level);
 370                 }
 371         }
 372         args->verbose = verbose;
 373         args->base = base;
 374         args->baselen = strlen(base);
 375         args->worktree_attributes = worktree_attributes;
 376
 377         return argc;
 378 }
 379
 380 int write_archive(int argc, const char **argv, const char *prefix,
 381                 int setup_prefix)
 382 {
 383         const struct archiver *ar = NULL;
 384         struct archiver_args args;
 385
 386         argc = parse_archive_args(argc, argv, &ar, &args);
 387         if (setup_prefix && prefix == NULL)
 388                 prefix = setup_git_directory();
 389
 390         parse_treeish_arg(argv, &args, prefix);
 391         parse_pathspec_arg(argv + 1, &args);
 392
 393         git_config(git_default_config, NULL);
 394
 395         return ar->write_archive(&args);
 396 }