Andrew's git / gitweb.git / archive.c
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archive.con commit fsck: fix leak when traversing trees (ba3a08c)
   1#include "cache.h"
   2#include "config.h"
   3#include "refs.h"
   4#include "commit.h"
   5#include "tree-walk.h"
   6#include "attr.h"
   7#include "archive.h"
   8#include "parse-options.h"
   9#include "unpack-trees.h"
  10#include "dir.h"
  11
  12static char const * const archive_usage[] = {
  13        N_("git archive [<options>] <tree-ish> [<path>...]"),
  14        N_("git archive --list"),
  15        N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  16        N_("git archive --remote <repo> [--exec <cmd>] --list"),
  17        NULL
  18};
  19
  20static const struct archiver **archivers;
  21static int nr_archivers;
  22static int alloc_archivers;
  23static int remote_allow_unreachable;
  24
  25void register_archiver(struct archiver *ar)
  26{
  27        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  28        archivers[nr_archivers++] = ar;
  29}
  30
  31static void format_subst(const struct commit *commit,
  32                         const char *src, size_t len,
  33                         struct strbuf *buf)
  34{
  35        char *to_free = NULL;
  36        struct strbuf fmt = STRBUF_INIT;
  37        struct pretty_print_context ctx = {0};
  38        ctx.date_mode.type = DATE_NORMAL;
  39        ctx.abbrev = DEFAULT_ABBREV;
  40
  41        if (src == buf->buf)
  42                to_free = strbuf_detach(buf, NULL);
  43        for (;;) {
  44                const char *b, *c;
  45
  46                b = memmem(src, len, "$Format:", 8);
  47                if (!b)
  48                        break;
  49                c = memchr(b + 8, '$', (src + len) - b - 8);
  50                if (!c)
  51                        break;
  52
  53                strbuf_reset(&fmt);
  54                strbuf_add(&fmt, b + 8, c - b - 8);
  55
  56                strbuf_add(buf, src, b - src);
  57                format_commit_message(commit, fmt.buf, buf, &ctx);
  58                len -= c + 1 - src;
  59                src  = c + 1;
  60        }
  61        strbuf_add(buf, src, len);
  62        strbuf_release(&fmt);
  63        free(to_free);
  64}
  65
  66void *sha1_file_to_archive(const struct archiver_args *args,
  67                           const char *path, const unsigned char *sha1,
  68                           unsigned int mode, enum object_type *type,
  69                           unsigned long *sizep)
  70{
  71        void *buffer;
  72        const struct commit *commit = args->convert ? args->commit : NULL;
  73
  74        path += args->baselen;
  75        buffer = read_sha1_file(sha1, type, sizep);
  76        if (buffer && S_ISREG(mode)) {
  77                struct strbuf buf = STRBUF_INIT;
  78                size_t size = 0;
  79
  80                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  81                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  82                if (commit)
  83                        format_subst(commit, buf.buf, buf.len, &buf);
  84                buffer = strbuf_detach(&buf, &size);
  85                *sizep = size;
  86        }
  87
  88        return buffer;
  89}
  90
  91struct directory {
  92        struct directory *up;
  93        struct object_id oid;
  94        int baselen, len;
  95        unsigned mode;
  96        int stage;
  97        char path[FLEX_ARRAY];
  98};
  99
 100struct archiver_context {
 101        struct archiver_args *args;
 102        write_archive_entry_fn_t write_entry;
 103        struct directory *bottom;
 104};
 105
 106static int write_archive_entry(const unsigned char *sha1, const char *base,
 107                int baselen, const char *filename, unsigned mode, int stage,
 108                void *context)
 109{
 110        static struct strbuf path = STRBUF_INIT;
 111        static struct attr_check *check;
 112        struct archiver_context *c = context;
 113        struct archiver_args *args = c->args;
 114        write_archive_entry_fn_t write_entry = c->write_entry;
 115        const char *path_without_prefix;
 116        int err;
 117
 118        args->convert = 0;
 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        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 125                strbuf_addch(&path, '/');
 126        path_without_prefix = path.buf + args->baselen;
 127
 128        if (!check)
 129                check = attr_check_initl("export-ignore", "export-subst", NULL);
 130        if (!git_check_attr(path_without_prefix, check)) {
 131                if (ATTR_TRUE(check->items[0].value))
 132                        return 0;
 133                args->convert = ATTR_TRUE(check->items[1].value);
 134        }
 135
 136        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 137                if (args->verbose)
 138                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 139                err = write_entry(args, sha1, path.buf, path.len, mode);
 140                if (err)
 141                        return err;
 142                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 143        }
 144
 145        if (args->verbose)
 146                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 147        return write_entry(args, sha1, path.buf, path.len, mode);
 148}
 149
 150static int write_archive_entry_buf(const unsigned char *sha1, struct strbuf *base,
 151                const char *filename, unsigned mode, int stage,
 152                void *context)
 153{
 154        return write_archive_entry(sha1, base->buf, base->len,
 155                                     filename, mode, stage, context);
 156}
 157
 158static void queue_directory(const unsigned char *sha1,
 159                struct strbuf *base, const char *filename,
 160                unsigned mode, int stage, struct archiver_context *c)
 161{
 162        struct directory *d;
 163        size_t len = st_add4(base->len, 1, strlen(filename), 1);
 164        d = xmalloc(st_add(sizeof(*d), len));
 165        d->up      = c->bottom;
 166        d->baselen = base->len;
 167        d->mode    = mode;
 168        d->stage   = stage;
 169        c->bottom  = d;
 170        d->len = xsnprintf(d->path, len, "%.*s%s/", (int)base->len, base->buf, filename);
 171        hashcpy(d->oid.hash, sha1);
 172}
 173
 174static int write_directory(struct archiver_context *c)
 175{
 176        struct directory *d = c->bottom;
 177        int ret;
 178
 179        if (!d)
 180                return 0;
 181        c->bottom = d->up;
 182        d->path[d->len - 1] = '\0'; /* no trailing slash */
 183        ret =
 184                write_directory(c) ||
 185                write_archive_entry(d->oid.hash, d->path, d->baselen,
 186                                    d->path + d->baselen, d->mode,
 187                                    d->stage, c) != READ_TREE_RECURSIVE;
 188        free(d);
 189        return ret ? -1 : 0;
 190}
 191
 192static int queue_or_write_archive_entry(const unsigned char *sha1,
 193                struct strbuf *base, const char *filename,
 194                unsigned mode, int stage, void *context)
 195{
 196        struct archiver_context *c = context;
 197
 198        while (c->bottom &&
 199               !(base->len >= c->bottom->len &&
 200                 !strncmp(base->buf, c->bottom->path, c->bottom->len))) {
 201                struct directory *next = c->bottom->up;
 202                free(c->bottom);
 203                c->bottom = next;
 204        }
 205
 206        if (S_ISDIR(mode)) {
 207                queue_directory(sha1, base, filename,
 208                                mode, stage, c);
 209                return READ_TREE_RECURSIVE;
 210        }
 211
 212        if (write_directory(c))
 213                return -1;
 214        return write_archive_entry(sha1, base->buf, base->len, filename, mode,
 215                                   stage, context);
 216}
 217
 218int write_archive_entries(struct archiver_args *args,
 219                write_archive_entry_fn_t write_entry)
 220{
 221        struct archiver_context context;
 222        struct unpack_trees_options opts;
 223        struct tree_desc t;
 224        int err;
 225
 226        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 227                size_t len = args->baselen;
 228
 229                while (len > 1 && args->base[len - 2] == '/')
 230                        len--;
 231                if (args->verbose)
 232                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 233                err = write_entry(args, args->tree->object.oid.hash, args->base,
 234                                  len, 040777);
 235                if (err)
 236                        return err;
 237        }
 238
 239        memset(&context, 0, sizeof(context));
 240        context.args = args;
 241        context.write_entry = write_entry;
 242
 243        /*
 244         * Setup index and instruct attr to read index only
 245         */
 246        if (!args->worktree_attributes) {
 247                memset(&opts, 0, sizeof(opts));
 248                opts.index_only = 1;
 249                opts.head_idx = -1;
 250                opts.src_index = &the_index;
 251                opts.dst_index = &the_index;
 252                opts.fn = oneway_merge;
 253                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 254                if (unpack_trees(1, &t, &opts))
 255                        return -1;
 256                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 257        }
 258
 259        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 260                                  args->pathspec.has_wildcard ?
 261                                  queue_or_write_archive_entry :
 262                                  write_archive_entry_buf,
 263                                  &context);
 264        if (err == READ_TREE_RECURSIVE)
 265                err = 0;
 266        while (context.bottom) {
 267                struct directory *next = context.bottom->up;
 268                free(context.bottom);
 269                context.bottom = next;
 270        }
 271        return err;
 272}
 273
 274static const struct archiver *lookup_archiver(const char *name)
 275{
 276        int i;
 277
 278        if (!name)
 279                return NULL;
 280
 281        for (i = 0; i < nr_archivers; i++) {
 282                if (!strcmp(name, archivers[i]->name))
 283                        return archivers[i];
 284        }
 285        return NULL;
 286}
 287
 288static int reject_entry(const unsigned char *sha1, struct strbuf *base,
 289                        const char *filename, unsigned mode,
 290                        int stage, void *context)
 291{
 292        int ret = -1;
 293        if (S_ISDIR(mode)) {
 294                struct strbuf sb = STRBUF_INIT;
 295                strbuf_addbuf(&sb, base);
 296                strbuf_addstr(&sb, filename);
 297                if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
 298                        ret = READ_TREE_RECURSIVE;
 299                strbuf_release(&sb);
 300        }
 301        return ret;
 302}
 303
 304static int path_exists(struct tree *tree, const char *path)
 305{
 306        const char *paths[] = { path, NULL };
 307        struct pathspec pathspec;
 308        int ret;
 309
 310        parse_pathspec(&pathspec, 0, 0, "", paths);
 311        pathspec.recursive = 1;
 312        ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
 313                                  reject_entry, &pathspec);
 314        clear_pathspec(&pathspec);
 315        return ret != 0;
 316}
 317
 318static void parse_pathspec_arg(const char **pathspec,
 319                struct archiver_args *ar_args)
 320{
 321        /*
 322         * must be consistent with parse_pathspec in path_exists()
 323         * Also if pathspec patterns are dependent, we're in big
 324         * trouble as we test each one separately
 325         */
 326        parse_pathspec(&ar_args->pathspec, 0,
 327                       PATHSPEC_PREFER_FULL,
 328                       "", pathspec);
 329        ar_args->pathspec.recursive = 1;
 330        if (pathspec) {
 331                while (*pathspec) {
 332                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 333                                die(_("pathspec '%s' did not match any files"), *pathspec);
 334                        pathspec++;
 335                }
 336        }
 337}
 338
 339static void parse_treeish_arg(const char **argv,
 340                struct archiver_args *ar_args, const char *prefix,
 341                int remote)
 342{
 343        const char *name = argv[0];
 344        const unsigned char *commit_sha1;
 345        time_t archive_time;
 346        struct tree *tree;
 347        const struct commit *commit;
 348        struct object_id oid;
 349
 350        /* Remotes are only allowed to fetch actual refs */
 351        if (remote && !remote_allow_unreachable) {
 352                char *ref = NULL;
 353                const char *colon = strchrnul(name, ':');
 354                int refnamelen = colon - name;
 355
 356                if (!dwim_ref(name, refnamelen, oid.hash, &ref))
 357                        die("no such ref: %.*s", refnamelen, name);
 358                free(ref);
 359        }
 360
 361        if (get_sha1(name, oid.hash))
 362                die("Not a valid object name");
 363
 364        commit = lookup_commit_reference_gently(&oid, 1);
 365        if (commit) {
 366                commit_sha1 = commit->object.oid.hash;
 367                archive_time = commit->date;
 368        } else {
 369                commit_sha1 = NULL;
 370                archive_time = time(NULL);
 371        }
 372
 373        tree = parse_tree_indirect(&oid);
 374        if (tree == NULL)
 375                die("not a tree object");
 376
 377        if (prefix) {
 378                struct object_id tree_oid;
 379                unsigned int mode;
 380                int err;
 381
 382                err = get_tree_entry(tree->object.oid.hash, prefix,
 383                                     tree_oid.hash, &mode);
 384                if (err || !S_ISDIR(mode))
 385                        die("current working directory is untracked");
 386
 387                tree = parse_tree_indirect(&tree_oid);
 388        }
 389        ar_args->tree = tree;
 390        ar_args->commit_sha1 = commit_sha1;
 391        ar_args->commit = commit;
 392        ar_args->time = archive_time;
 393}
 394
 395#define OPT__COMPR(s, v, h, p) \
 396        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 397          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 398#define OPT__COMPR_HIDDEN(s, v, p) \
 399        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 400          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 401
 402static int parse_archive_args(int argc, const char **argv,
 403                const struct archiver **ar, struct archiver_args *args,
 404                const char *name_hint, int is_remote)
 405{
 406        const char *format = NULL;
 407        const char *base = NULL;
 408        const char *remote = NULL;
 409        const char *exec = NULL;
 410        const char *output = NULL;
 411        int compression_level = -1;
 412        int verbose = 0;
 413        int i;
 414        int list = 0;
 415        int worktree_attributes = 0;
 416        struct option opts[] = {
 417                OPT_GROUP(""),
 418                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 419                OPT_STRING(0, "prefix", &base, N_("prefix"),
 420                        N_("prepend prefix to each pathname in the archive")),
 421                OPT_STRING('o', "output", &output, N_("file"),
 422                        N_("write the archive to this file")),
 423                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 424                        N_("read .gitattributes in working directory")),
 425                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 426                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 427                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 428                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 429                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 430                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 431                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 432                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 433                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 434                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 435                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 436                OPT_GROUP(""),
 437                OPT_BOOL('l', "list", &list,
 438                        N_("list supported archive formats")),
 439                OPT_GROUP(""),
 440                OPT_STRING(0, "remote", &remote, N_("repo"),
 441                        N_("retrieve the archive from remote repository <repo>")),
 442                OPT_STRING(0, "exec", &exec, N_("command"),
 443                        N_("path to the remote git-upload-archive command")),
 444                OPT_END()
 445        };
 446
 447        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 448
 449        if (remote)
 450                die(_("Unexpected option --remote"));
 451        if (exec)
 452                die(_("Option --exec can only be used together with --remote"));
 453        if (output)
 454                die(_("Unexpected option --output"));
 455
 456        if (!base)
 457                base = "";
 458
 459        if (list) {
 460                for (i = 0; i < nr_archivers; i++)
 461                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 462                                printf("%s\n", archivers[i]->name);
 463                exit(0);
 464        }
 465
 466        if (!format && name_hint)
 467                format = archive_format_from_filename(name_hint);
 468        if (!format)
 469                format = "tar";
 470
 471        /* We need at least one parameter -- tree-ish */
 472        if (argc < 1)
 473                usage_with_options(archive_usage, opts);
 474        *ar = lookup_archiver(format);
 475        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 476                die(_("Unknown archive format '%s'"), format);
 477
 478        args->compression_level = Z_DEFAULT_COMPRESSION;
 479        if (compression_level != -1) {
 480                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 481                        args->compression_level = compression_level;
 482                else {
 483                        die(_("Argument not supported for format '%s': -%d"),
 484                                        format, compression_level);
 485                }
 486        }
 487        args->verbose = verbose;
 488        args->base = base;
 489        args->baselen = strlen(base);
 490        args->worktree_attributes = worktree_attributes;
 491
 492        return argc;
 493}
 494
 495int write_archive(int argc, const char **argv, const char *prefix,
 496                  const char *name_hint, int remote)
 497{
 498        const struct archiver *ar = NULL;
 499        struct archiver_args args;
 500
 501        git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 502        git_config(git_default_config, NULL);
 503
 504        init_tar_archiver();
 505        init_zip_archiver();
 506
 507        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 508        if (!startup_info->have_repository) {
 509                /*
 510                 * We know this will die() with an error, so we could just
 511                 * die ourselves; but its error message will be more specific
 512                 * than what we could write here.
 513                 */
 514                setup_git_directory();
 515        }
 516
 517        parse_treeish_arg(argv, &args, prefix, remote);
 518        parse_pathspec_arg(argv + 1, &args);
 519
 520        return ar->write_archive(ar, &args);
 521}
 522
 523static int match_extension(const char *filename, const char *ext)
 524{
 525        int prefixlen = strlen(filename) - strlen(ext);
 526
 527        /*
 528         * We need 1 character for the '.', and 1 character to ensure that the
 529         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 530         * filename).
 531         */
 532        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 533                return 0;
 534        return !strcmp(filename + prefixlen, ext);
 535}
 536
 537const char *archive_format_from_filename(const char *filename)
 538{
 539        int i;
 540
 541        for (i = 0; i < nr_archivers; i++)
 542                if (match_extension(filename, archivers[i]->name))
 543                        return archivers[i]->name;
 544        return NULL;
 545}