Andrew's git / gitweb.git / archive.c
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archive.con commit check_filename(): use skip_prefix (d51c6ee)
   1#include "cache.h"
   2#include "refs.h"
   3#include "commit.h"
   4#include "tree-walk.h"
   5#include "attr.h"
   6#include "archive.h"
   7#include "parse-options.h"
   8#include "unpack-trees.h"
   9#include "dir.h"
  10
  11static char const * const archive_usage[] = {
  12        N_("git archive [<options>] <tree-ish> [<path>...]"),
  13        N_("git archive --list"),
  14        N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  15        N_("git archive --remote <repo> [--exec <cmd>] --list"),
  16        NULL
  17};
  18
  19static const struct archiver **archivers;
  20static int nr_archivers;
  21static int alloc_archivers;
  22static int remote_allow_unreachable;
  23
  24void register_archiver(struct archiver *ar)
  25{
  26        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  27        archivers[nr_archivers++] = ar;
  28}
  29
  30static void format_subst(const struct commit *commit,
  31                         const char *src, size_t len,
  32                         struct strbuf *buf)
  33{
  34        char *to_free = NULL;
  35        struct strbuf fmt = STRBUF_INIT;
  36        struct pretty_print_context ctx = {0};
  37        ctx.date_mode.type = DATE_NORMAL;
  38        ctx.abbrev = DEFAULT_ABBREV;
  39
  40        if (src == buf->buf)
  41                to_free = strbuf_detach(buf, NULL);
  42        for (;;) {
  43                const char *b, *c;
  44
  45                b = memmem(src, len, "$Format:", 8);
  46                if (!b)
  47                        break;
  48                c = memchr(b + 8, '$', (src + len) - b - 8);
  49                if (!c)
  50                        break;
  51
  52                strbuf_reset(&fmt);
  53                strbuf_add(&fmt, b + 8, c - b - 8);
  54
  55                strbuf_add(buf, src, b - src);
  56                format_commit_message(commit, fmt.buf, buf, &ctx);
  57                len -= c + 1 - src;
  58                src  = c + 1;
  59        }
  60        strbuf_add(buf, src, len);
  61        strbuf_release(&fmt);
  62        free(to_free);
  63}
  64
  65void *sha1_file_to_archive(const struct archiver_args *args,
  66                           const char *path, const unsigned char *sha1,
  67                           unsigned int mode, enum object_type *type,
  68                           unsigned long *sizep)
  69{
  70        void *buffer;
  71        const struct commit *commit = args->convert ? args->commit : NULL;
  72
  73        path += args->baselen;
  74        buffer = read_sha1_file(sha1, type, sizep);
  75        if (buffer && S_ISREG(mode)) {
  76                struct strbuf buf = STRBUF_INIT;
  77                size_t size = 0;
  78
  79                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  80                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  81                if (commit)
  82                        format_subst(commit, buf.buf, buf.len, &buf);
  83                buffer = strbuf_detach(&buf, &size);
  84                *sizep = size;
  85        }
  86
  87        return buffer;
  88}
  89
  90struct directory {
  91        struct directory *up;
  92        struct object_id oid;
  93        int baselen, len;
  94        unsigned mode;
  95        int stage;
  96        char path[FLEX_ARRAY];
  97};
  98
  99struct archiver_context {
 100        struct archiver_args *args;
 101        write_archive_entry_fn_t write_entry;
 102        struct directory *bottom;
 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        static struct attr_check *check;
 111        struct archiver_context *c = context;
 112        struct archiver_args *args = c->args;
 113        write_archive_entry_fn_t write_entry = c->write_entry;
 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        if (!check)
 128                check = attr_check_initl("export-ignore", "export-subst", NULL);
 129        if (!git_check_attr(path_without_prefix, check)) {
 130                if (ATTR_TRUE(check->items[0].value))
 131                        return 0;
 132                args->convert = ATTR_TRUE(check->items[1].value);
 133        }
 134
 135        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 136                if (args->verbose)
 137                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 138                err = write_entry(args, sha1, path.buf, path.len, mode);
 139                if (err)
 140                        return err;
 141                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 142        }
 143
 144        if (args->verbose)
 145                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 146        return write_entry(args, sha1, path.buf, path.len, mode);
 147}
 148
 149static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,
 150                const char *filename, unsigned mode, int stage,
 151                void *context)
 152{
 153        return write_archive_entry(sha1, base->buf, base->len,
 154                                     filename, mode, stage, context);
 155}
 156
 157static void queue_directory(const unsigned char *sha1,
 158                struct strbuf *base, const char *filename,
 159                unsigned mode, int stage, struct archiver_context *c)
 160{
 161        struct directory *d;
 162        size_t len = st_add4(base->len, 1, strlen(filename), 1);
 163        d = xmalloc(st_add(sizeof(*d), len));
 164        d->up      = c->bottom;
 165        d->baselen = base->len;
 166        d->mode    = mode;
 167        d->stage   = stage;
 168        c->bottom  = d;
 169        d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 170        hashcpy(d->oid.hash, sha1);
 171}
 172
 173static int write_directory(struct archiver_context *c)
 174{
 175        struct directory *d = c->bottom;
 176        int ret;
 177
 178        if (!d)
 179                return 0;
 180        c->bottom = d->up;
 181        d->path[d->len - 1] = '\0'; /* no trailing slash */
 182        ret =
 183                write_directory(c) ||
 184                write_archive_entry(d->oid.hash, d->path, d->baselen,
 185                                    d->path + d->baselen, d->mode,
 186                                    d->stage, c) != READ_TREE_RECURSIVE;
 187        free(d);
 188        return ret ? -1 : 0;
 189}
 190
 191static int queue_or_write_archive_entry(const unsigned char *sha1,
 192                struct strbuf *base, const char *filename,
 193                unsigned mode, int stage, void *context)
 194{
 195        struct archiver_context *c = context;
 196
 197        while (c->bottom &&
 198               !(base->len >= c->bottom->len &&
 199                 !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 200                struct directory *next = c->bottom->up;
 201                free(c->bottom);
 202                c->bottom = next;
 203        }
 204
 205        if (S_ISDIR(mode)) {
 206                queue_directory(sha1, base, filename,
 207                                mode, stage, c);
 208                return READ_TREE_RECURSIVE;
 209        }
 210
 211        if (write_directory(c))
 212                return -1;
 213        return write_archive_entry(sha1, base->buf, base->len, filename, mode,
 214                                   stage, context);
 215}
 216
 217int write_archive_entries(struct archiver_args *args,
 218                write_archive_entry_fn_t write_entry)
 219{
 220        struct archiver_context context;
 221        struct unpack_trees_options opts;
 222        struct tree_desc t;
 223        int err;
 224
 225        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 226                size_t len = args->baselen;
 227
 228                while (len > 1 && args->base[len - 2] == '/')
 229                        len--;
 230                if (args->verbose)
 231                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 232                err = write_entry(args, args->tree->object.oid.hash, args->base,
 233                                  len, 040777);
 234                if (err)
 235                        return err;
 236        }
 237
 238        memset(&context, 0, sizeof(context));
 239        context.args = args;
 240        context.write_entry = write_entry;
 241
 242        /*
 243         * Setup index and instruct attr to read index only
 244         */
 245        if (!args->worktree_attributes) {
 246                memset(&opts, 0, sizeof(opts));
 247                opts.index_only = 1;
 248                opts.head_idx = -1;
 249                opts.src_index = &the_index;
 250                opts.dst_index = &the_index;
 251                opts.fn = oneway_merge;
 252                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 253                if (unpack_trees(1, &t, &opts))
 254                        return -1;
 255                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 256        }
 257
 258        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 259                                  args->pathspec.has_wildcard ?
 260                                  queue_or_write_archive_entry :
 261                                  write_archive_entry_buf,
 262                                  &context);
 263        if (err == READ_TREE_RECURSIVE)
 264                err = 0;
 265        while (context.bottom) {
 266                struct directory *next = context.bottom->up;
 267                free(context.bottom);
 268                context.bottom = next;
 269        }
 270        return err;
 271}
 272
 273static const struct archiver *lookup_archiver(const char *name)
 274{
 275        int i;
 276
 277        if (!name)
 278                return NULL;
 279
 280        for (i = 0; i < nr_archivers; i++) {
 281                if (!strcmp(name, archivers[i]->name))
 282                        return archivers[i];
 283        }
 284        return NULL;
 285}
 286
 287static int reject_entry(const unsigned char *sha1, struct strbuf *base,
 288                        const char *filename, unsigned mode,
 289                        int stage, void *context)
 290{
 291        int ret = -1;
 292        if (S_ISDIR(mode)) {
 293                struct strbuf sb = STRBUF_INIT;
 294                strbuf_addbuf(&sb, base);
 295                strbuf_addstr(&sb, filename);
 296                if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
 297                        ret = READ_TREE_RECURSIVE;
 298                strbuf_release(&sb);
 299        }
 300        return ret;
 301}
 302
 303static int path_exists(struct tree *tree, const char *path)
 304{
 305        const char *paths[] = { path, NULL };
 306        struct pathspec pathspec;
 307        int ret;
 308
 309        parse_pathspec(&pathspec, 0, 0, "", paths);
 310        pathspec.recursive = 1;
 311        ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
 312                                  reject_entry, &pathspec);
 313        clear_pathspec(&pathspec);
 314        return ret != 0;
 315}
 316
 317static void parse_pathspec_arg(const char **pathspec,
 318                struct archiver_args *ar_args)
 319{
 320        /*
 321         * must be consistent with parse_pathspec in path_exists()
 322         * Also if pathspec patterns are dependent, we're in big
 323         * trouble as we test each one separately
 324         */
 325        parse_pathspec(&ar_args->pathspec, 0,
 326                       PATHSPEC_PREFER_FULL,
 327                       "", pathspec);
 328        ar_args->pathspec.recursive = 1;
 329        if (pathspec) {
 330                while (*pathspec) {
 331                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 332                                die(_("pathspec '%s' did not match any files"), *pathspec);
 333                        pathspec++;
 334                }
 335        }
 336}
 337
 338static void parse_treeish_arg(const char **argv,
 339                struct archiver_args *ar_args, const char *prefix,
 340                int remote)
 341{
 342        const char *name = argv[0];
 343        const unsigned char *commit_sha1;
 344        time_t archive_time;
 345        struct tree *tree;
 346        const struct commit *commit;
 347        struct object_id oid;
 348
 349        /* Remotes are only allowed to fetch actual refs */
 350        if (remote && !remote_allow_unreachable) {
 351                char *ref = NULL;
 352                const char *colon = strchrnul(name, ':');
 353                int refnamelen = colon - name;
 354
 355                if (!dwim_ref(name, refnamelen, oid.hash, &ref))
 356                        die("no such ref: %.*s", refnamelen, name);
 357                free(ref);
 358        }
 359
 360        if (get_sha1(name, oid.hash))
 361                die("Not a valid object name");
 362
 363        commit = lookup_commit_reference_gently(oid.hash, 1);
 364        if (commit) {
 365                commit_sha1 = commit->object.oid.hash;
 366                archive_time = commit->date;
 367        } else {
 368                commit_sha1 = NULL;
 369                archive_time = time(NULL);
 370        }
 371
 372        tree = parse_tree_indirect(oid.hash);
 373        if (tree == NULL)
 374                die("not a tree object");
 375
 376        if (prefix) {
 377                struct object_id tree_oid;
 378                unsigned int mode;
 379                int err;
 380
 381                err = get_tree_entry(tree->object.oid.hash, prefix,
 382                                     tree_oid.hash, &mode);
 383                if (err || !S_ISDIR(mode))
 384                        die("current working directory is untracked");
 385
 386                tree = parse_tree_indirect(tree_oid.hash);
 387        }
 388        ar_args->tree = tree;
 389        ar_args->commit_sha1 = commit_sha1;
 390        ar_args->commit = commit;
 391        ar_args->time = archive_time;
 392}
 393
 394#define OPT__COMPR(s, v, h, p) \
 395        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 396          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 397#define OPT__COMPR_HIDDEN(s, v, p) \
 398        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 399          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 400
 401static int parse_archive_args(int argc, const char **argv,
 402                const struct archiver **ar, struct archiver_args *args,
 403                const char *name_hint, int is_remote)
 404{
 405        const char *format = NULL;
 406        const char *base = NULL;
 407        const char *remote = NULL;
 408        const char *exec = NULL;
 409        const char *output = NULL;
 410        int compression_level = -1;
 411        int verbose = 0;
 412        int i;
 413        int list = 0;
 414        int worktree_attributes = 0;
 415        struct option opts[] = {
 416                OPT_GROUP(""),
 417                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 418                OPT_STRING(0, "prefix", &base, N_("prefix"),
 419                        N_("prepend prefix to each pathname in the archive")),
 420                OPT_STRING('o', "output", &output, N_("file"),
 421                        N_("write the archive to this file")),
 422                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 423                        N_("read .gitattributes in working directory")),
 424                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 425                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 426                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 427                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 428                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 429                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 430                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 431                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 432                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 433                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 434                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 435                OPT_GROUP(""),
 436                OPT_BOOL('l', "list", &list,
 437                        N_("list supported archive formats")),
 438                OPT_GROUP(""),
 439                OPT_STRING(0, "remote", &remote, N_("repo"),
 440                        N_("retrieve the archive from remote repository <repo>")),
 441                OPT_STRING(0, "exec", &exec, N_("command"),
 442                        N_("path to the remote git-upload-archive command")),
 443                OPT_END()
 444        };
 445
 446        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 447
 448        if (remote)
 449                die(_("Unexpected option --remote"));
 450        if (exec)
 451                die(_("Option --exec can only be used together with --remote"));
 452        if (output)
 453                die(_("Unexpected option --output"));
 454
 455        if (!base)
 456                base = "";
 457
 458        if (list) {
 459                for (i = 0; i < nr_archivers; i++)
 460                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 461                                printf("%s\n", archivers[i]->name);
 462                exit(0);
 463        }
 464
 465        if (!format && name_hint)
 466                format = archive_format_from_filename(name_hint);
 467        if (!format)
 468                format = "tar";
 469
 470        /* We need at least one parameter -- tree-ish */
 471        if (argc < 1)
 472                usage_with_options(archive_usage, opts);
 473        *ar = lookup_archiver(format);
 474        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 475                die(_("Unknown archive format '%s'"), format);
 476
 477        args->compression_level = Z_DEFAULT_COMPRESSION;
 478        if (compression_level != -1) {
 479                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 480                        args->compression_level = compression_level;
 481                else {
 482                        die(_("Argument not supported for format '%s': -%d"),
 483                                        format, compression_level);
 484                }
 485        }
 486        args->verbose = verbose;
 487        args->base = base;
 488        args->baselen = strlen(base);
 489        args->worktree_attributes = worktree_attributes;
 490
 491        return argc;
 492}
 493
 494int write_archive(int argc, const char **argv, const char *prefix,
 495                  const char *name_hint, int remote)
 496{
 497        const struct archiver *ar = NULL;
 498        struct archiver_args args;
 499
 500        git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 501        git_config(git_default_config, NULL);
 502
 503        init_tar_archiver();
 504        init_zip_archiver();
 505
 506        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 507        if (!startup_info->have_repository) {
 508                /*
 509                 * We know this will die() with an error, so we could just
 510                 * die ourselves; but its error message will be more specific
 511                 * than what we could write here.
 512                 */
 513                setup_git_directory();
 514        }
 515
 516        parse_treeish_arg(argv, &args, prefix, remote);
 517        parse_pathspec_arg(argv + 1, &args);
 518
 519        return ar->write_archive(ar, &args);
 520}
 521
 522static int match_extension(const char *filename, const char *ext)
 523{
 524        int prefixlen = strlen(filename) - strlen(ext);
 525
 526        /*
 527         * We need 1 character for the '.', and 1 character to ensure that the
 528         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 529         * filename).
 530         */
 531        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 532                return 0;
 533        return !strcmp(filename + prefixlen, ext);
 534}
 535
 536const char *archive_format_from_filename(const char *filename)
 537{
 538        int i;
 539
 540        for (i = 0; i < nr_archivers; i++)
 541                if (match_extension(filename, archivers[i]->name))
 542                        return archivers[i]->name;
 543        return NULL;
 544}