Andrew's git / gitweb.git / archive.c
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archive.con commit wrapper: implement xopen() (3ff53df)
   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
  90static void setup_archive_check(struct git_attr_check *check)
  91{
  92        static struct git_attr *attr_export_ignore;
  93        static struct git_attr *attr_export_subst;
  94
  95        if (!attr_export_ignore) {
  96                attr_export_ignore = git_attr("export-ignore");
  97                attr_export_subst = git_attr("export-subst");
  98        }
  99        check[0].attr = attr_export_ignore;
 100        check[1].attr = attr_export_subst;
 101}
 102
 103struct directory {
 104        struct directory *up;
 105        struct object_id oid;
 106        int baselen, len;
 107        unsigned mode;
 108        int stage;
 109        char path[FLEX_ARRAY];
 110};
 111
 112struct archiver_context {
 113        struct archiver_args *args;
 114        write_archive_entry_fn_t write_entry;
 115        struct directory *bottom;
 116};
 117
 118static int write_archive_entry(const unsigned char *sha1, const char *base,
 119                int baselen, const char *filename, unsigned mode, int stage,
 120                void *context)
 121{
 122        static struct strbuf path = STRBUF_INIT;
 123        struct archiver_context *c = context;
 124        struct archiver_args *args = c->args;
 125        write_archive_entry_fn_t write_entry = c->write_entry;
 126        struct git_attr_check check[2];
 127        const char *path_without_prefix;
 128        int err;
 129
 130        args->convert = 0;
 131        strbuf_reset(&path);
 132        strbuf_grow(&path, PATH_MAX);
 133        strbuf_add(&path, args->base, args->baselen);
 134        strbuf_add(&path, base, baselen);
 135        strbuf_addstr(&path, filename);
 136        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 137                strbuf_addch(&path, '/');
 138        path_without_prefix = path.buf + args->baselen;
 139
 140        setup_archive_check(check);
 141        if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 142                if (ATTR_TRUE(check[0].value))
 143                        return 0;
 144                args->convert = ATTR_TRUE(check[1].value);
 145        }
 146
 147        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 148                if (args->verbose)
 149                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 150                err = write_entry(args, sha1, path.buf, path.len, mode);
 151                if (err)
 152                        return err;
 153                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 154        }
 155
 156        if (args->verbose)
 157                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 158        return write_entry(args, sha1, path.buf, path.len, mode);
 159}
 160
 161static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,
 162                const char *filename, unsigned mode, int stage,
 163                void *context)
 164{
 165        return write_archive_entry(sha1, base->buf, base->len,
 166                                     filename, mode, stage, context);
 167}
 168
 169static void queue_directory(const unsigned char *sha1,
 170                struct strbuf *base, const char *filename,
 171                unsigned mode, int stage, struct archiver_context *c)
 172{
 173        struct directory *d;
 174        d = xmallocz(sizeof(*d) + base->len + 1 + strlen(filename));
 175        d->up      = c->bottom;
 176        d->baselen = base->len;
 177        d->mode    = mode;
 178        d->stage   = stage;
 179        c->bottom  = d;
 180        d->len = sprintf(d->path, "%.*s%s/", (int)base->len, base->buf, filename);
 181        hashcpy(d->oid.hash, sha1);
 182}
 183
 184static int write_directory(struct archiver_context *c)
 185{
 186        struct directory *d = c->bottom;
 187        int ret;
 188
 189        if (!d)
 190                return 0;
 191        c->bottom = d->up;
 192        d->path[d->len - 1] = '\0'; /* no trailing slash */
 193        ret =
 194                write_directory(c) ||
 195                write_archive_entry(d->oid.hash, d->path, d->baselen,
 196                                    d->path + d->baselen, d->mode,
 197                                    d->stage, c) != READ_TREE_RECURSIVE;
 198        free(d);
 199        return ret ? -1 : 0;
 200}
 201
 202static int queue_or_write_archive_entry(const unsigned char *sha1,
 203                struct strbuf *base, const char *filename,
 204                unsigned mode, int stage, void *context)
 205{
 206        struct archiver_context *c = context;
 207
 208        while (c->bottom &&
 209               !(base->len >= c->bottom->len &&
 210                 !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 211                struct directory *next = c->bottom->up;
 212                free(c->bottom);
 213                c->bottom = next;
 214        }
 215
 216        if (S_ISDIR(mode)) {
 217                queue_directory(sha1, base, filename,
 218                                mode, stage, c);
 219                return READ_TREE_RECURSIVE;
 220        }
 221
 222        if (write_directory(c))
 223                return -1;
 224        return write_archive_entry(sha1, base->buf, base->len, filename, mode,
 225                                   stage, context);
 226}
 227
 228int write_archive_entries(struct archiver_args *args,
 229                write_archive_entry_fn_t write_entry)
 230{
 231        struct archiver_context context;
 232        struct unpack_trees_options opts;
 233        struct tree_desc t;
 234        int err;
 235
 236        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 237                size_t len = args->baselen;
 238
 239                while (len > 1 && args->base[len - 2] == '/')
 240                        len--;
 241                if (args->verbose)
 242                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 243                err = write_entry(args, args->tree->object.sha1, args->base,
 244                                  len, 040777);
 245                if (err)
 246                        return err;
 247        }
 248
 249        memset(&context, 0, sizeof(context));
 250        context.args = args;
 251        context.write_entry = write_entry;
 252
 253        /*
 254         * Setup index and instruct attr to read index only
 255         */
 256        if (!args->worktree_attributes) {
 257                memset(&opts, 0, sizeof(opts));
 258                opts.index_only = 1;
 259                opts.head_idx = -1;
 260                opts.src_index = &the_index;
 261                opts.dst_index = &the_index;
 262                opts.fn = oneway_merge;
 263                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 264                if (unpack_trees(1, &t, &opts))
 265                        return -1;
 266                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 267        }
 268
 269        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 270                                  args->pathspec.has_wildcard ?
 271                                  queue_or_write_archive_entry :
 272                                  write_archive_entry_buf,
 273                                  &context);
 274        if (err == READ_TREE_RECURSIVE)
 275                err = 0;
 276        while (context.bottom) {
 277                struct directory *next = context.bottom->up;
 278                free(context.bottom);
 279                context.bottom = next;
 280        }
 281        return err;
 282}
 283
 284static const struct archiver *lookup_archiver(const char *name)
 285{
 286        int i;
 287
 288        if (!name)
 289                return NULL;
 290
 291        for (i = 0; i < nr_archivers; i++) {
 292                if (!strcmp(name, archivers[i]->name))
 293                        return archivers[i];
 294        }
 295        return NULL;
 296}
 297
 298static int reject_entry(const unsigned char *sha1, struct strbuf *base,
 299                        const char *filename, unsigned mode,
 300                        int stage, void *context)
 301{
 302        int ret = -1;
 303        if (S_ISDIR(mode)) {
 304                struct strbuf sb = STRBUF_INIT;
 305                strbuf_addbuf(&sb, base);
 306                strbuf_addstr(&sb, filename);
 307                if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
 308                        ret = READ_TREE_RECURSIVE;
 309                strbuf_release(&sb);
 310        }
 311        return ret;
 312}
 313
 314static int path_exists(struct tree *tree, const char *path)
 315{
 316        const char *paths[] = { path, NULL };
 317        struct pathspec pathspec;
 318        int ret;
 319
 320        parse_pathspec(&pathspec, 0, 0, "", paths);
 321        pathspec.recursive = 1;
 322        ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
 323                                  reject_entry, &pathspec);
 324        free_pathspec(&pathspec);
 325        return ret != 0;
 326}
 327
 328static void parse_pathspec_arg(const char **pathspec,
 329                struct archiver_args *ar_args)
 330{
 331        /*
 332         * must be consistent with parse_pathspec in path_exists()
 333         * Also if pathspec patterns are dependent, we're in big
 334         * trouble as we test each one separately
 335         */
 336        parse_pathspec(&ar_args->pathspec, 0,
 337                       PATHSPEC_PREFER_FULL,
 338                       "", pathspec);
 339        ar_args->pathspec.recursive = 1;
 340        if (pathspec) {
 341                while (*pathspec) {
 342                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 343                                die(_("pathspec '%s' did not match any files"), *pathspec);
 344                        pathspec++;
 345                }
 346        }
 347}
 348
 349static void parse_treeish_arg(const char **argv,
 350                struct archiver_args *ar_args, const char *prefix,
 351                int remote)
 352{
 353        const char *name = argv[0];
 354        const unsigned char *commit_sha1;
 355        time_t archive_time;
 356        struct tree *tree;
 357        const struct commit *commit;
 358        struct object_id oid;
 359
 360        /* Remotes are only allowed to fetch actual refs */
 361        if (remote && !remote_allow_unreachable) {
 362                char *ref = NULL;
 363                const char *colon = strchrnul(name, ':');
 364                int refnamelen = colon - name;
 365
 366                if (!dwim_ref(name, refnamelen, oid.hash, &ref))
 367                        die("no such ref: %.*s", refnamelen, name);
 368                free(ref);
 369        }
 370
 371        if (get_sha1(name, oid.hash))
 372                die("Not a valid object name");
 373
 374        commit = lookup_commit_reference_gently(oid.hash, 1);
 375        if (commit) {
 376                commit_sha1 = commit->object.sha1;
 377                archive_time = commit->date;
 378        } else {
 379                commit_sha1 = NULL;
 380                archive_time = time(NULL);
 381        }
 382
 383        tree = parse_tree_indirect(oid.hash);
 384        if (tree == NULL)
 385                die("not a tree object");
 386
 387        if (prefix) {
 388                struct object_id tree_oid;
 389                unsigned int mode;
 390                int err;
 391
 392                err = get_tree_entry(tree->object.sha1, prefix,
 393                                     tree_oid.hash, &mode);
 394                if (err || !S_ISDIR(mode))
 395                        die("current working directory is untracked");
 396
 397                tree = parse_tree_indirect(tree_oid.hash);
 398        }
 399        ar_args->tree = tree;
 400        ar_args->commit_sha1 = commit_sha1;
 401        ar_args->commit = commit;
 402        ar_args->time = archive_time;
 403}
 404
 405#define OPT__COMPR(s, v, h, p) \
 406        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 407          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 408#define OPT__COMPR_HIDDEN(s, v, p) \
 409        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 410          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 411
 412static int parse_archive_args(int argc, const char **argv,
 413                const struct archiver **ar, struct archiver_args *args,
 414                const char *name_hint, int is_remote)
 415{
 416        const char *format = NULL;
 417        const char *base = NULL;
 418        const char *remote = NULL;
 419        const char *exec = NULL;
 420        const char *output = NULL;
 421        int compression_level = -1;
 422        int verbose = 0;
 423        int i;
 424        int list = 0;
 425        int worktree_attributes = 0;
 426        struct option opts[] = {
 427                OPT_GROUP(""),
 428                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 429                OPT_STRING(0, "prefix", &base, N_("prefix"),
 430                        N_("prepend prefix to each pathname in the archive")),
 431                OPT_STRING('o', "output", &output, N_("file"),
 432                        N_("write the archive to this file")),
 433                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 434                        N_("read .gitattributes in working directory")),
 435                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 436                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 437                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 438                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 439                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 440                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 441                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 442                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 443                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 444                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 445                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 446                OPT_GROUP(""),
 447                OPT_BOOL('l', "list", &list,
 448                        N_("list supported archive formats")),
 449                OPT_GROUP(""),
 450                OPT_STRING(0, "remote", &remote, N_("repo"),
 451                        N_("retrieve the archive from remote repository <repo>")),
 452                OPT_STRING(0, "exec", &exec, N_("command"),
 453                        N_("path to the remote git-upload-archive command")),
 454                OPT_END()
 455        };
 456
 457        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 458
 459        if (remote)
 460                die("Unexpected option --remote");
 461        if (exec)
 462                die("Option --exec can only be used together with --remote");
 463        if (output)
 464                die("Unexpected option --output");
 465
 466        if (!base)
 467                base = "";
 468
 469        if (list) {
 470                for (i = 0; i < nr_archivers; i++)
 471                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 472                                printf("%s\n", archivers[i]->name);
 473                exit(0);
 474        }
 475
 476        if (!format && name_hint)
 477                format = archive_format_from_filename(name_hint);
 478        if (!format)
 479                format = "tar";
 480
 481        /* We need at least one parameter -- tree-ish */
 482        if (argc < 1)
 483                usage_with_options(archive_usage, opts);
 484        *ar = lookup_archiver(format);
 485        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 486                die("Unknown archive format '%s'", format);
 487
 488        args->compression_level = Z_DEFAULT_COMPRESSION;
 489        if (compression_level != -1) {
 490                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 491                        args->compression_level = compression_level;
 492                else {
 493                        die("Argument not supported for format '%s': -%d",
 494                                        format, compression_level);
 495                }
 496        }
 497        args->verbose = verbose;
 498        args->base = base;
 499        args->baselen = strlen(base);
 500        args->worktree_attributes = worktree_attributes;
 501
 502        return argc;
 503}
 504
 505int write_archive(int argc, const char **argv, const char *prefix,
 506                  int setup_prefix, const char *name_hint, int remote)
 507{
 508        int nongit = 0;
 509        const struct archiver *ar = NULL;
 510        struct archiver_args args;
 511
 512        if (setup_prefix && prefix == NULL)
 513                prefix = setup_git_directory_gently(&nongit);
 514
 515        git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 516        git_config(git_default_config, NULL);
 517
 518        init_tar_archiver();
 519        init_zip_archiver();
 520
 521        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 522        if (nongit) {
 523                /*
 524                 * We know this will die() with an error, so we could just
 525                 * die ourselves; but its error message will be more specific
 526                 * than what we could write here.
 527                 */
 528                setup_git_directory();
 529        }
 530
 531        parse_treeish_arg(argv, &args, prefix, remote);
 532        parse_pathspec_arg(argv + 1, &args);
 533
 534        return ar->write_archive(ar, &args);
 535}
 536
 537static int match_extension(const char *filename, const char *ext)
 538{
 539        int prefixlen = strlen(filename) - strlen(ext);
 540
 541        /*
 542         * We need 1 character for the '.', and 1 character to ensure that the
 543         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 544         * filename).
 545         */
 546        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 547                return 0;
 548        return !strcmp(filename + prefixlen, ext);
 549}
 550
 551const char *archive_format_from_filename(const char *filename)
 552{
 553        int i;
 554
 555        for (i = 0; i < nr_archivers; i++)
 556                if (match_extension(filename, archivers[i]->name))
 557                        return archivers[i]->name;
 558        return NULL;
 559}