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
  35         if (src == buf->buf)
  36                 to_free = strbuf_detach(buf, NULL);
  37         for (;;) {
  38                 const char *b, *c;
  39
  40                 b = memmem(src, len, "$Format:", 8);
  41                 if (!b)
  42                         break;
  43                 c = memchr(b + 8, '$', (src + len) - b - 8);
  44                 if (!c)
  45                         break;
  46
  47                 strbuf_reset(&fmt);
  48                 strbuf_add(&fmt, b + 8, c - b - 8);
  49
  50                 strbuf_add(buf, src, b - src);
  51                 format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
  52                 len -= c + 1 - src;
  53                 src  = c + 1;
  54         }
  55         strbuf_add(buf, src, len);
  56         strbuf_release(&fmt);
  57         free(to_free);
  58 }
  59
  60 static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  61                 unsigned int mode, enum object_type *type,
  62                 unsigned long *sizep, const struct commit *commit)
  63 {
  64         void *buffer;
  65
  66         buffer = read_sha1_file(sha1, type, sizep);
  67         if (buffer && S_ISREG(mode)) {
  68                 struct strbuf buf = STRBUF_INIT;
  69                 size_t size = 0;
  70
  71                 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  72                 convert_to_working_tree(path, buf.buf, buf.len, &buf);
  73                 if (commit)
  74                         format_subst(commit, buf.buf, buf.len, &buf);
  75                 buffer = strbuf_detach(&buf, &size);
  76                 *sizep = size;
  77         }
  78
  79         return buffer;
  80 }
  81
  82 static void setup_archive_check(struct git_attr_check *check)
  83 {
  84         static struct git_attr *attr_export_ignore;
  85         static struct git_attr *attr_export_subst;
  86
  87         if (!attr_export_ignore) {
  88                 attr_export_ignore = git_attr("export-ignore", 13);
  89                 attr_export_subst = git_attr("export-subst", 12);
  90         }
  91         check[0].attr = attr_export_ignore;
  92         check[1].attr = attr_export_subst;
  93 }
  94
  95 struct archiver_context {
  96         struct archiver_args *args;
  97         write_archive_entry_fn_t write_entry;
  98 };
  99
 100 static int write_archive_entry(const unsigned char *sha1, const char *base,
 101                 int baselen, const char *filename, unsigned mode, int stage,
 102                 void *context)
 103 {
 104         static struct strbuf path = STRBUF_INIT;
 105         struct archiver_context *c = context;
 106         struct archiver_args *args = c->args;
 107         write_archive_entry_fn_t write_entry = c->write_entry;
 108         struct git_attr_check check[2];
 109         const char *path_without_prefix;
 110         int convert = 0;
 111         int err;
 112         enum object_type type;
 113         unsigned long size;
 114         void *buffer;
 115
 116         strbuf_reset(&path);
 117         strbuf_grow(&path, PATH_MAX);
 118         strbuf_add(&path, args->base, args->baselen);
 119         strbuf_add(&path, base, baselen);
 120         strbuf_addstr(&path, filename);
 121         path_without_prefix = path.buf + args->baselen;
 122
 123         setup_archive_check(check);
 124         if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
 125                 if (ATTR_TRUE(check[0].value))
 126                         return 0;
 127                 convert = ATTR_TRUE(check[1].value);
 128         }
 129
 130         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 131                 strbuf_addch(&path, '/');
 132                 if (args->verbose)
 133                         fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 134                 err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
 135                 if (err)
 136                         return err;
 137                 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 138         }
 139
 140         buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 141                         &type, &size, convert ? args->commit : NULL);
 142         if (!buffer)
 143                 return error("cannot read %s", sha1_to_hex(sha1));
 144         if (args->verbose)
 145                 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 146         err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 147         free(buffer);
 148         return err;
 149 }
 150
 151 int write_archive_entries(struct archiver_args *args,
 152                 write_archive_entry_fn_t write_entry)
 153 {
 154         struct archiver_context context;
 155         struct unpack_trees_options opts;
 156         struct tree_desc t;
 157         int err;
 158
 159         if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 160                 size_t len = args->baselen;
 161
 162                 while (len > 1 && args->base[len - 2] == '/')
 163                         len--;
 164                 if (args->verbose)
 165                         fprintf(stderr, "%.*s\n", (int)len, args->base);
 166                 err = write_entry(args, args->tree->object.sha1, args->base,
 167                                 len, 040777, NULL, 0);
 168                 if (err)
 169                         return err;
 170         }
 171
 172         context.args = args;
 173         context.write_entry = write_entry;
 174
 175         /*
 176          * Setup index and instruct attr to read index only
 177          */
 178         if (!args->worktree_attributes) {
 179                 memset(&opts, 0, sizeof(opts));
 180                 opts.index_only = 1;
 181                 opts.head_idx = -1;
 182                 opts.src_index = &the_index;
 183                 opts.dst_index = &the_index;
 184                 opts.fn = oneway_merge;
 185                 init_tree_desc(&t, args->tree->buffer, args->tree->size);
 186                 if (unpack_trees(1, &t, &opts))
 187                         return -1;
 188                 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 189         }
 190
 191         err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec,
 192                                   write_archive_entry, &context);
 193         if (err == READ_TREE_RECURSIVE)
 194                 err = 0;
 195         return err;
 196 }
 197
 198 static const struct archiver *lookup_archiver(const char *name)
 199 {
 200         int i;
 201
 202         if (!name)
 203                 return NULL;
 204
 205         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 206                 if (!strcmp(name, archivers[i].name))
 207                         return &archivers[i];
 208         }
 209         return NULL;
 210 }
 211
 212 static void parse_pathspec_arg(const char **pathspec,
 213                 struct archiver_args *ar_args)
 214 {
 215         ar_args->pathspec = get_pathspec("", pathspec);
 216 }
 217
 218 static void parse_treeish_arg(const char **argv,
 219                 struct archiver_args *ar_args, const char *prefix)
 220 {
 221         const char *name = argv[0];
 222         const unsigned char *commit_sha1;
 223         time_t archive_time;
 224         struct tree *tree;
 225         const struct commit *commit;
 226         unsigned char sha1[20];
 227
 228         if (get_sha1(name, sha1))
 229                 die("Not a valid object name");
 230
 231         commit = lookup_commit_reference_gently(sha1, 1);
 232         if (commit) {
 233                 commit_sha1 = commit->object.sha1;
 234                 archive_time = commit->date;
 235         } else {
 236                 commit_sha1 = NULL;
 237                 archive_time = time(NULL);
 238         }
 239
 240         tree = parse_tree_indirect(sha1);
 241         if (tree == NULL)
 242                 die("not a tree object");
 243
 244         if (prefix) {
 245                 unsigned char tree_sha1[20];
 246                 unsigned int mode;
 247                 int err;
 248
 249                 err = get_tree_entry(tree->object.sha1, prefix,
 250                                      tree_sha1, &mode);
 251                 if (err || !S_ISDIR(mode))
 252                         die("current working directory is untracked");
 253
 254                 tree = parse_tree_indirect(tree_sha1);
 255         }
 256         ar_args->tree = tree;
 257         ar_args->commit_sha1 = commit_sha1;
 258         ar_args->commit = commit;
 259         ar_args->time = archive_time;
 260 }
 261
 262 #define OPT__COMPR(s, v, h, p) \
 263         { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 264           PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 265 #define OPT__COMPR_HIDDEN(s, v, p) \
 266         { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 267           PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 268
 269 static int parse_archive_args(int argc, const char **argv,
 270                 const struct archiver **ar, struct archiver_args *args)
 271 {
 272         const char *format = "tar";
 273         const char *base = NULL;
 274         const char *remote = NULL;
 275         const char *exec = NULL;
 276         const char *output = NULL;
 277         int compression_level = -1;
 278         int verbose = 0;
 279         int i;
 280         int list = 0;
 281         int worktree_attributes = 0;
 282         struct option opts[] = {
 283                 OPT_GROUP(""),
 284                 OPT_STRING(0, "format", &format, "fmt", "archive format"),
 285                 OPT_STRING(0, "prefix", &base, "prefix",
 286                         "prepend prefix to each pathname in the archive"),
 287                 OPT_STRING('o', "output", &output, "file",
 288                         "write the archive to this file"),
 289                 OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
 290                         "read .gitattributes in working directory"),
 291                 OPT__VERBOSE(&verbose),
 292                 OPT__COMPR('0', &compression_level, "store only", 0),
 293                 OPT__COMPR('1', &compression_level, "compress faster", 1),
 294                 OPT__COMPR_HIDDEN('2', &compression_level, 2),
 295                 OPT__COMPR_HIDDEN('3', &compression_level, 3),
 296                 OPT__COMPR_HIDDEN('4', &compression_level, 4),
 297                 OPT__COMPR_HIDDEN('5', &compression_level, 5),
 298                 OPT__COMPR_HIDDEN('6', &compression_level, 6),
 299                 OPT__COMPR_HIDDEN('7', &compression_level, 7),
 300                 OPT__COMPR_HIDDEN('8', &compression_level, 8),
 301                 OPT__COMPR('9', &compression_level, "compress better", 9),
 302                 OPT_GROUP(""),
 303                 OPT_BOOLEAN('l', "list", &list,
 304                         "list supported archive formats"),
 305                 OPT_GROUP(""),
 306                 OPT_STRING(0, "remote", &remote, "repo",
 307                         "retrieve the archive from remote repository <repo>"),
 308                 OPT_STRING(0, "exec", &exec, "cmd",
 309                         "path to the remote git-upload-archive command"),
 310                 OPT_END()
 311         };
 312
 313         argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 314
 315         if (remote)
 316                 die("Unexpected option --remote");
 317         if (exec)
 318                 die("Option --exec can only be used together with --remote");
 319         if (output)
 320                 die("Unexpected option --output");
 321
 322         if (!base)
 323                 base = "";
 324
 325         if (list) {
 326                 for (i = 0; i < ARRAY_SIZE(archivers); i++)
 327                         printf("%s\n", archivers[i].name);
 328                 exit(0);
 329         }
 330
 331         /* We need at least one parameter -- tree-ish */
 332         if (argc < 1)
 333                 usage_with_options(archive_usage, opts);
 334         *ar = lookup_archiver(format);
 335         if (!*ar)
 336                 die("Unknown archive format '%s'", format);
 337
 338         args->compression_level = Z_DEFAULT_COMPRESSION;
 339         if (compression_level != -1) {
 340                 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 341                         args->compression_level = compression_level;
 342                 else {
 343                         die("Argument not supported for format '%s': -%d",
 344                                         format, compression_level);
 345                 }
 346         }
 347         args->verbose = verbose;
 348         args->base = base;
 349         args->baselen = strlen(base);
 350         args->worktree_attributes = worktree_attributes;
 351
 352         return argc;
 353 }
 354
 355 int write_archive(int argc, const char **argv, const char *prefix,
 356                 int setup_prefix)
 357 {
 358         const struct archiver *ar = NULL;
 359         struct archiver_args args;
 360
 361         argc = parse_archive_args(argc, argv, &ar, &args);
 362         if (setup_prefix && prefix == NULL)
 363                 prefix = setup_git_directory();
 364
 365         parse_treeish_arg(argv, &args, prefix);
 366         parse_pathspec_arg(argv + 1, &args);
 367
 368         git_config(git_default_config, NULL);
 369
 370         return ar->write_archive(&args);
 371 }