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         ctx.abbrev = DEFAULT_ABBREV;
  37
  38         if (src == buf->buf)
  39                 to_free = strbuf_detach(buf, NULL);
  40         for (;;) {
  41                 const char *b, *c;
  42
  43                 b = memmem(src, len, "$Format:", 8);
  44                 if (!b)
  45                         break;
  46                 c = memchr(b + 8, '$', (src + len) - b - 8);
  47                 if (!c)
  48                         break;
  49
  50                 strbuf_reset(&fmt);
  51                 strbuf_add(&fmt, b + 8, c - b - 8);
  52
  53                 strbuf_add(buf, src, b - src);
  54                 format_commit_message(commit, fmt.buf, buf, &ctx);
  55                 len -= c + 1 - src;
  56                 src  = c + 1;
  57         }
  58         strbuf_add(buf, src, len);
  59         strbuf_release(&fmt);
  60         free(to_free);
  61 }
  62
  63 static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  64                 unsigned int mode, enum object_type *type,
  65                 unsigned long *sizep, const struct commit *commit)
  66 {
  67         void *buffer;
  68
  69         buffer = read_sha1_file(sha1, type, sizep);
  70         if (buffer && S_ISREG(mode)) {
  71                 struct strbuf buf = STRBUF_INIT;
  72                 size_t size = 0;
  73
  74                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  75                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  76                 if (commit)
  77                         format_subst(commit, buf.buf, buf.len, &buf);
  78                 buffer = strbuf_detach(&buf, &size);
  79                 *sizep = size;
  80         }
  81
  82         return buffer;
  83 }
  84
  85 static void setup_archive_check(struct git_attr_check *check)
  86 {
  87         static struct git_attr *attr_export_ignore;
  88         static struct git_attr *attr_export_subst;
  89
  90         if (!attr_export_ignore) {
  91                 attr_export_ignore = git_attr("export-ignore");
  92                 attr_export_subst = git_attr("export-subst");
  93         }
  94         check[0].attr = attr_export_ignore;
  95         check[1].attr = attr_export_subst;
  96 }
  97
  98 struct archiver_context {
  99         struct archiver_args *args;
 100         write_archive_entry_fn_t write_entry;
 101 };
 102
 103 static int write_archive_entry(const unsigned char *sha1, const char *base,
 104                 int baselen, const char *filename, unsigned mode, int stage,
 105                 void *context)
 106 {
 107         static struct strbuf path = STRBUF_INIT;
 108         struct archiver_context *c = context;
 109         struct archiver_args *args = c->args;
 110         write_archive_entry_fn_t write_entry = c->write_entry;
 111         struct git_attr_check check[2];
 112         const char *path_without_prefix;
 113         int convert = 0;
 114         int err;
 115         enum object_type type;
 116         unsigned long size;
 117         void *buffer;
 118
 119         strbuf_reset(&path);
 120         strbuf_grow(&path, PATH_MAX);
 121         strbuf_add(&path, args->base, args->baselen);
 122         strbuf_add(&path, base, baselen);
 123         strbuf_addstr(&path, filename);
 124         path_without_prefix = path.buf + args->baselen;
 125
 126         setup_archive_check(check);
 127         if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
 128                 if (ATTR_TRUE(check[0].value))
 129                         return 0;
 130                 convert = ATTR_TRUE(check[1].value);
 131         }
 132
 133         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 134                 strbuf_addch(&path, '/');
 135                 if (args->verbose)
 136                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 137                 err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
 138                 if (err)
 139                         return err;
 140                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 141         }
 142
 143         buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 144                         &type, &size, convert ? args->commit : NULL);
 145         if (!buffer)
 146                 return error("cannot read %s", sha1_to_hex(sha1));
 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, buffer, size);
 150         free(buffer);
 151         return err;
 152 }
 153
 154 int write_archive_entries(struct archiver_args *args,
 155                 write_archive_entry_fn_t write_entry)
 156 {
 157         struct archiver_context context;
 158         struct unpack_trees_options opts;
 159         struct tree_desc t;
 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         err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec,
 195                                   write_archive_entry, &context);
 196         if (err == READ_TREE_RECURSIVE)
 197                 err = 0;
 198         return err;
 199 }
 200
 201 static const struct archiver *lookup_archiver(const char *name)
 202 {
 203         int i;
 204
 205         if (!name)
 206                 return NULL;
 207
 208         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 209                 if (!strcmp(name, archivers[i].name))
 210                         return &archivers[i];
 211         }
 212         return NULL;
 213 }
 214
 215 static int reject_entry(const unsigned char *sha1, const char *base,
 216                         int baselen, const char *filename, unsigned mode,
 217                         int stage, void *context)
 218 {
 219         return -1;
 220 }
 221
 222 static int path_exists(struct tree *tree, const char *path)
 223 {
 224         const char *pathspec[] = { path, NULL };
 225
 226         if (read_tree_recursive(tree, "", 0, 0, pathspec, reject_entry, NULL))
 227                 return 1;
 228         return 0;
 229 }
 230
 231 static void parse_pathspec_arg(const char **pathspec,
 232                 struct archiver_args *ar_args)
 233 {
 234         ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 235         if (pathspec) {
 236                 while (*pathspec) {
 237                         if (!path_exists(ar_args->tree, *pathspec))
 238                                 die("path not found: %s", *pathspec);
 239                         pathspec++;
 240                 }
 241         }
 242 }
 243
 244 static void parse_treeish_arg(const char **argv,
 245                 struct archiver_args *ar_args, const char *prefix)
 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         if (get_sha1(name, sha1))
 255                 die("Not a valid object name");
 256
 257         commit = lookup_commit_reference_gently(sha1, 1);
 258         if (commit) {
 259                 commit_sha1 = commit->object.sha1;
 260                 archive_time = commit->date;
 261         } else {
 262                 commit_sha1 = NULL;
 263                 archive_time = time(NULL);
 264         }
 265
 266         tree = parse_tree_indirect(sha1);
 267         if (tree == NULL)
 268                 die("not a tree object");
 269
 270         if (prefix) {
 271                 unsigned char tree_sha1[20];
 272                 unsigned int mode;
 273                 int err;
 274
 275                 err = get_tree_entry(tree->object.sha1, prefix,
 276                                      tree_sha1, &mode);
 277                 if (err || !S_ISDIR(mode))
 278                         die("current working directory is untracked");
 279
 280                 tree = parse_tree_indirect(tree_sha1);
 281         }
 282         ar_args->tree = tree;
 283         ar_args->commit_sha1 = commit_sha1;
 284         ar_args->commit = commit;
 285         ar_args->time = archive_time;
 286 }
 287
 288 #define OPT__COMPR(s, v, h, p) \
 289         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 290           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 291 #define OPT__COMPR_HIDDEN(s, v, p) \
 292         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 293           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 294
 295 static int parse_archive_args(int argc, const char **argv,
 296                 const struct archiver **ar, struct archiver_args *args)
 297 {
 298         const char *format = "tar";
 299         const char *base = NULL;
 300         const char *remote = NULL;
 301         const char *exec = NULL;
 302         const char *output = NULL;
 303         int compression_level = -1;
 304         int verbose = 0;
 305         int i;
 306         int list = 0;
 307         int worktree_attributes = 0;
 308         struct option opts[] = {
 309                 OPT_GROUP(""),
 310                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 311                 OPT_STRING(0, "prefix", &base, "prefix",
 312                         "prepend prefix to each pathname in the archive"),
 313                 OPT_STRING('o', "output", &output, "file",
 314                         "write the archive to this file"),
 315                 OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
 316                         "read .gitattributes in working directory"),
 317                 OPT__VERBOSE(&verbose),
 318                 OPT__COMPR('0', &compression_level, "store only", 0),
 319                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 320                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 321                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 322                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 323                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 324                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 325                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 326                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 327                 OPT__COMPR('9', &compression_level, "compress better", 9),
 328                 OPT_GROUP(""),
 329                 OPT_BOOLEAN('l', "list", &list,
 330                         "list supported archive formats"),
 331                 OPT_GROUP(""),
 332                 OPT_STRING(0, "remote", &remote, "repo",
 333                         "retrieve the archive from remote repository <repo>"),
 334                 OPT_STRING(0, "exec", &exec, "cmd",
 335                         "path to the remote git-upload-archive command"),
 336                 OPT_END()
 337         };
 338
 339         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 340
 341         if (remote)
 342                 die("Unexpected option --remote");
 343         if (exec)
 344                 die("Option --exec can only be used together with --remote");
 345         if (output)
 346                 die("Unexpected option --output");
 347
 348         if (!base)
 349                 base = "";
 350
 351         if (list) {
 352                 for (i = 0; i < ARRAY_SIZE(archivers); i++)
 353                         printf("%s\n", archivers[i].name);
 354                 exit(0);
 355         }
 356
 357         /* We need at least one parameter -- tree-ish */
 358         if (argc < 1)
 359                 usage_with_options(archive_usage, opts);
 360         *ar = lookup_archiver(format);
 361         if (!*ar)
 362                 die("Unknown archive format '%s'", format);
 363
 364         args->compression_level = Z_DEFAULT_COMPRESSION;
 365         if (compression_level != -1) {
 366                 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 367                         args->compression_level = compression_level;
 368                 else {
 369                         die("Argument not supported for format '%s': -%d",
 370                                         format, compression_level);
 371                 }
 372         }
 373         args->verbose = verbose;
 374         args->base = base;
 375         args->baselen = strlen(base);
 376         args->worktree_attributes = worktree_attributes;
 377
 378         return argc;
 379 }
 380
 381 int write_archive(int argc, const char **argv, const char *prefix,
 382                 int setup_prefix)
 383 {
 384         const struct archiver *ar = NULL;
 385         struct archiver_args args;
 386
 387         argc = parse_archive_args(argc, argv, &ar, &args);
 388         if (setup_prefix && prefix == NULL)
 389                 prefix = setup_git_directory();
 390
 391         parse_treeish_arg(argv, &args, prefix);
 392         parse_pathspec_arg(argv + 1, &args);
 393
 394         git_config(git_default_config, NULL);
 395
 396         return ar->write_archive(&args);
 397 }