Andrew's git - gitweb.git/blob

   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
   9static char const * const archive_usage[] = {
  10        N_("git archive [options] <tree-ish> [<path>...]"),
  11        N_("git archive --list"),
  12        N_("git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [<path>...]"),
  13        N_("git archive --remote <repo> [--exec <cmd>] --list"),
  14        NULL
  15};
  16
  17static const struct archiver **archivers;
  18static int nr_archivers;
  19static int alloc_archivers;
  20
  21void register_archiver(struct archiver *ar)
  22{
  23        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  24        archivers[nr_archivers++] = ar;
  25}
  26
  27static 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
  62void *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
  87static 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
 100struct archiver_context {
 101        struct archiver_args *args;
 102        write_archive_entry_fn_t write_entry;
 103};
 104
 105static 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        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 124                strbuf_addch(&path, '/');
 125        path_without_prefix = path.buf + args->baselen;
 126
 127        setup_archive_check(check);
 128        if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 129                if (ATTR_TRUE(check[0].value))
 130                        return 0;
 131                args->convert = ATTR_TRUE(check[1].value);
 132        }
 133
 134        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 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);
 138                if (err)
 139                        return err;
 140                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 141        }
 142
 143        if (args->verbose)
 144                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 145        return write_entry(args, sha1, path.buf, path.len, mode);
 146}
 147
 148int write_archive_entries(struct archiver_args *args,
 149                write_archive_entry_fn_t write_entry)
 150{
 151        struct archiver_context context;
 152        struct unpack_trees_options opts;
 153        struct tree_desc t;
 154        struct pathspec pathspec;
 155        int err;
 156
 157        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 158                size_t len = args->baselen;
 159
 160                while (len > 1 && args->base[len - 2] == '/')
 161                        len--;
 162                if (args->verbose)
 163                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 164                err = write_entry(args, args->tree->object.sha1, args->base,
 165                                  len, 040777);
 166                if (err)
 167                        return err;
 168        }
 169
 170        context.args = args;
 171        context.write_entry = write_entry;
 172
 173        /*
 174         * Setup index and instruct attr to read index only
 175         */
 176        if (!args->worktree_attributes) {
 177                memset(&opts, 0, sizeof(opts));
 178                opts.index_only = 1;
 179                opts.head_idx = -1;
 180                opts.src_index = &the_index;
 181                opts.dst_index = &the_index;
 182                opts.fn = oneway_merge;
 183                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 184                if (unpack_trees(1, &t, &opts))
 185                        return -1;
 186                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 187        }
 188
 189        init_pathspec(&pathspec, args->pathspec);
 190        err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
 191                                  write_archive_entry, &context);
 192        free_pathspec(&pathspec);
 193        if (err == READ_TREE_RECURSIVE)
 194                err = 0;
 195        return err;
 196}
 197
 198static 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 < nr_archivers; i++) {
 206                if (!strcmp(name, archivers[i]->name))
 207                        return archivers[i];
 208        }
 209        return NULL;
 210}
 211
 212static int reject_entry(const unsigned char *sha1, const char *base,
 213                        int baselen, const char *filename, unsigned mode,
 214                        int stage, void *context)
 215{
 216        return -1;
 217}
 218
 219static int path_exists(struct tree *tree, const char *path)
 220{
 221        const char *paths[] = { path, NULL };
 222        struct pathspec pathspec;
 223        int ret;
 224
 225        init_pathspec(&pathspec, paths);
 226        ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 227        free_pathspec(&pathspec);
 228        return ret != 0;
 229}
 230
 231static 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 (**pathspec && !path_exists(ar_args->tree, *pathspec))
 238                                die("path not found: %s", *pathspec);
 239                        pathspec++;
 240                }
 241        }
 242}
 243
 244static void parse_treeish_arg(const char **argv,
 245                struct archiver_args *ar_args, const char *prefix,
 246                int remote)
 247{
 248        const char *name = argv[0];
 249        const unsigned char *commit_sha1;
 250        time_t archive_time;
 251        struct tree *tree;
 252        const struct commit *commit;
 253        unsigned char sha1[20];
 254
 255        /* Remotes are only allowed to fetch actual refs */
 256        if (remote) {
 257                char *ref = NULL;
 258                const char *colon = strchr(name, ':');
 259                int refnamelen = colon ? colon - name : strlen(name);
 260
 261                if (!dwim_ref(name, refnamelen, sha1, &ref))
 262                        die("no such ref: %.*s", refnamelen, name);
 263                free(ref);
 264        }
 265
 266        if (get_sha1(name, sha1))
 267                die("Not a valid object name");
 268
 269        commit = lookup_commit_reference_gently(sha1, 1);
 270        if (commit) {
 271                commit_sha1 = commit->object.sha1;
 272                archive_time = commit->date;
 273        } else {
 274                commit_sha1 = NULL;
 275                archive_time = time(NULL);
 276        }
 277
 278        tree = parse_tree_indirect(sha1);
 279        if (tree == NULL)
 280                die("not a tree object");
 281
 282        if (prefix) {
 283                unsigned char tree_sha1[20];
 284                unsigned int mode;
 285                int err;
 286
 287                err = get_tree_entry(tree->object.sha1, prefix,
 288                                     tree_sha1, &mode);
 289                if (err || !S_ISDIR(mode))
 290                        die("current working directory is untracked");
 291
 292                tree = parse_tree_indirect(tree_sha1);
 293        }
 294        ar_args->tree = tree;
 295        ar_args->commit_sha1 = commit_sha1;
 296        ar_args->commit = commit;
 297        ar_args->time = archive_time;
 298}
 299
 300#define OPT__COMPR(s, v, h, p) \
 301        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 302          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 303#define OPT__COMPR_HIDDEN(s, v, p) \
 304        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 305          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 306
 307static int parse_archive_args(int argc, const char **argv,
 308                const struct archiver **ar, struct archiver_args *args,
 309                const char *name_hint, int is_remote)
 310{
 311        const char *format = NULL;
 312        const char *base = NULL;
 313        const char *remote = NULL;
 314        const char *exec = NULL;
 315        const char *output = NULL;
 316        int compression_level = -1;
 317        int verbose = 0;
 318        int i;
 319        int list = 0;
 320        int worktree_attributes = 0;
 321        struct option opts[] = {
 322                OPT_GROUP(""),
 323                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 324                OPT_STRING(0, "prefix", &base, N_("prefix"),
 325                        N_("prepend prefix to each pathname in the archive")),
 326                OPT_STRING('o', "output", &output, N_("file"),
 327                        N_("write the archive to this file")),
 328                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 329                        N_("read .gitattributes in working directory")),
 330                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 331                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 332                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 333                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 334                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 335                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 336                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 337                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 338                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 339                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 340                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 341                OPT_GROUP(""),
 342                OPT_BOOL('l', "list", &list,
 343                        N_("list supported archive formats")),
 344                OPT_GROUP(""),
 345                OPT_STRING(0, "remote", &remote, N_("repo"),
 346                        N_("retrieve the archive from remote repository <repo>")),
 347                OPT_STRING(0, "exec", &exec, N_("command"),
 348                        N_("path to the remote git-upload-archive command")),
 349                OPT_END()
 350        };
 351
 352        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 353
 354        if (remote)
 355                die("Unexpected option --remote");
 356        if (exec)
 357                die("Option --exec can only be used together with --remote");
 358        if (output)
 359                die("Unexpected option --output");
 360
 361        if (!base)
 362                base = "";
 363
 364        if (list) {
 365                for (i = 0; i < nr_archivers; i++)
 366                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 367                                printf("%s\n", archivers[i]->name);
 368                exit(0);
 369        }
 370
 371        if (!format && name_hint)
 372                format = archive_format_from_filename(name_hint);
 373        if (!format)
 374                format = "tar";
 375
 376        /* We need at least one parameter -- tree-ish */
 377        if (argc < 1)
 378                usage_with_options(archive_usage, opts);
 379        *ar = lookup_archiver(format);
 380        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 381                die("Unknown archive format '%s'", format);
 382
 383        args->compression_level = Z_DEFAULT_COMPRESSION;
 384        if (compression_level != -1) {
 385                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 386                        args->compression_level = compression_level;
 387                else {
 388                        die("Argument not supported for format '%s': -%d",
 389                                        format, compression_level);
 390                }
 391        }
 392        args->verbose = verbose;
 393        args->base = base;
 394        args->baselen = strlen(base);
 395        args->worktree_attributes = worktree_attributes;
 396
 397        return argc;
 398}
 399
 400int write_archive(int argc, const char **argv, const char *prefix,
 401                  int setup_prefix, const char *name_hint, int remote)
 402{
 403        int nongit = 0;
 404        const struct archiver *ar = NULL;
 405        struct archiver_args args;
 406
 407        if (setup_prefix && prefix == NULL)
 408                prefix = setup_git_directory_gently(&nongit);
 409
 410        git_config(git_default_config, NULL);
 411        init_tar_archiver();
 412        init_zip_archiver();
 413
 414        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 415        if (nongit) {
 416                /*
 417                 * We know this will die() with an error, so we could just
 418                 * die ourselves; but its error message will be more specific
 419                 * than what we could write here.
 420                 */
 421                setup_git_directory();
 422        }
 423
 424        parse_treeish_arg(argv, &args, prefix, remote);
 425        parse_pathspec_arg(argv + 1, &args);
 426
 427        return ar->write_archive(ar, &args);
 428}
 429
 430static int match_extension(const char *filename, const char *ext)
 431{
 432        int prefixlen = strlen(filename) - strlen(ext);
 433
 434        /*
 435         * We need 1 character for the '.', and 1 character to ensure that the
 436         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 437         * filename).
 438         */
 439        if (prefixlen < 2 || filename[prefixlen-1] != '.')
 440                return 0;
 441        return !strcmp(filename + prefixlen, ext);
 442}
 443
 444const char *archive_format_from_filename(const char *filename)
 445{
 446        int i;
 447
 448        for (i = 0; i < nr_archivers; i++)
 449                if (match_extension(filename, archivers[i]->name))
 450                        return archivers[i]->name;
 451        return NULL;
 452}