Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "config.h"
   3#include "refs.h"
   4#include "object-store.h"
   5#include "commit.h"
   6#include "tree-walk.h"
   7#include "attr.h"
   8#include "archive.h"
   9#include "parse-options.h"
  10#include "unpack-trees.h"
  11#include "dir.h"
  12
  13static char const * const archive_usage[] = {
  14        N_("git archive [<options>] <tree-ish> [<path>...]"),
  15        N_("git archive --list"),
  16        N_("git archive --remote <repo> [--exec <cmd>] [<options>] <tree-ish> [<path>...]"),
  17        N_("git archive --remote <repo> [--exec <cmd>] --list"),
  18        NULL
  19};
  20
  21static const struct archiver **archivers;
  22static int nr_archivers;
  23static int alloc_archivers;
  24static int remote_allow_unreachable;
  25
  26void register_archiver(struct archiver *ar)
  27{
  28        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  29        archivers[nr_archivers++] = ar;
  30}
  31
  32static void format_subst(const struct commit *commit,
  33                         const char *src, size_t len,
  34                         struct strbuf *buf)
  35{
  36        char *to_free = NULL;
  37        struct strbuf fmt = STRBUF_INIT;
  38        struct pretty_print_context ctx = {0};
  39        ctx.date_mode.type = DATE_NORMAL;
  40        ctx.abbrev = DEFAULT_ABBREV;
  41
  42        if (src == buf->buf)
  43                to_free = strbuf_detach(buf, NULL);
  44        for (;;) {
  45                const char *b, *c;
  46
  47                b = memmem(src, len, "$Format:", 8);
  48                if (!b)
  49                        break;
  50                c = memchr(b + 8, '$', (src + len) - b - 8);
  51                if (!c)
  52                        break;
  53
  54                strbuf_reset(&fmt);
  55                strbuf_add(&fmt, b + 8, c - b - 8);
  56
  57                strbuf_add(buf, src, b - src);
  58                format_commit_message(commit, fmt.buf, buf, &ctx);
  59                len -= c + 1 - src;
  60                src  = c + 1;
  61        }
  62        strbuf_add(buf, src, len);
  63        strbuf_release(&fmt);
  64        free(to_free);
  65}
  66
  67void *object_file_to_archive(const struct archiver_args *args,
  68                             const char *path, const struct object_id *oid,
  69                             unsigned int mode, enum object_type *type,
  70                             unsigned long *sizep)
  71{
  72        void *buffer;
  73        const struct commit *commit = args->convert ? args->commit : NULL;
  74
  75        path += args->baselen;
  76        buffer = read_object_file(oid, type, sizep);
  77        if (buffer && S_ISREG(mode)) {
  78                struct strbuf buf = STRBUF_INIT;
  79                size_t size = 0;
  80
  81                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  82                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  83                if (commit)
  84                        format_subst(commit, buf.buf, buf.len, &buf);
  85                buffer = strbuf_detach(&buf, &size);
  86                *sizep = size;
  87        }
  88
  89        return buffer;
  90}
  91
  92struct directory {
  93        struct directory *up;
  94        struct object_id oid;
  95        int baselen, len;
  96        unsigned mode;
  97        int stage;
  98        char path[FLEX_ARRAY];
  99};
 100
 101struct archiver_context {
 102        struct archiver_args *args;
 103        write_archive_entry_fn_t write_entry;
 104        struct directory *bottom;
 105};
 106
 107static const struct attr_check *get_archive_attrs(const char *path)
 108{
 109        static struct attr_check *check;
 110        if (!check)
 111                check = attr_check_initl("export-ignore", "export-subst", NULL);
 112        return git_check_attr(path, check) ? NULL : check;
 113}
 114
 115static int check_attr_export_ignore(const struct attr_check *check)
 116{
 117        return check && ATTR_TRUE(check->items[0].value);
 118}
 119
 120static int check_attr_export_subst(const struct attr_check *check)
 121{
 122        return check && ATTR_TRUE(check->items[1].value);
 123}
 124
 125static int write_archive_entry(const struct object_id *oid, const char *base,
 126                int baselen, const char *filename, unsigned mode, int stage,
 127                void *context)
 128{
 129        static struct strbuf path = STRBUF_INIT;
 130        struct archiver_context *c = context;
 131        struct archiver_args *args = c->args;
 132        write_archive_entry_fn_t write_entry = c->write_entry;
 133        int err;
 134        const char *path_without_prefix;
 135
 136        args->convert = 0;
 137        strbuf_reset(&path);
 138        strbuf_grow(&path, PATH_MAX);
 139        strbuf_add(&path, args->base, args->baselen);
 140        strbuf_add(&path, base, baselen);
 141        strbuf_addstr(&path, filename);
 142        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 143                strbuf_addch(&path, '/');
 144        path_without_prefix = path.buf + args->baselen;
 145
 146        if (!S_ISDIR(mode)) {
 147                const struct attr_check *check;
 148                check = get_archive_attrs(path_without_prefix);
 149                if (check_attr_export_ignore(check))
 150                        return 0;
 151                args->convert = check_attr_export_subst(check);
 152        }
 153
 154        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 155                if (args->verbose)
 156                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 157                err = write_entry(args, oid, path.buf, path.len, mode);
 158                if (err)
 159                        return err;
 160                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 161        }
 162
 163        if (args->verbose)
 164                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 165        return write_entry(args, oid, path.buf, path.len, mode);
 166}
 167
 168static void queue_directory(const unsigned char *sha1,
 169                struct strbuf *base, const char *filename,
 170                unsigned mode, int stage, struct archiver_context *c)
 171{
 172        struct directory *d;
 173        size_t len = st_add4(base->len, 1, strlen(filename), 1);
 174        d = xmalloc(st_add(sizeof(*d), len));
 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 = xsnprintf(d->path, len, "%.*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, 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 struct object_id *oid,
 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                size_t baselen = base->len;
 218                const struct attr_check *check;
 219
 220                /* Borrow base, but restore its original value when done. */
 221                strbuf_addstr(base, filename);
 222                strbuf_addch(base, '/');
 223                check = get_archive_attrs(base->buf);
 224                strbuf_setlen(base, baselen);
 225
 226                if (check_attr_export_ignore(check))
 227                        return 0;
 228                queue_directory(oid->hash, base, filename,
 229                                mode, stage, c);
 230                return READ_TREE_RECURSIVE;
 231        }
 232
 233        if (write_directory(c))
 234                return -1;
 235        return write_archive_entry(oid, base->buf, base->len, filename, mode,
 236                                   stage, context);
 237}
 238
 239int write_archive_entries(struct archiver_args *args,
 240                write_archive_entry_fn_t write_entry)
 241{
 242        struct archiver_context context;
 243        struct unpack_trees_options opts;
 244        struct tree_desc t;
 245        int err;
 246
 247        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 248                size_t len = args->baselen;
 249
 250                while (len > 1 && args->base[len - 2] == '/')
 251                        len--;
 252                if (args->verbose)
 253                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 254                err = write_entry(args, &args->tree->object.oid, args->base,
 255                                  len, 040777);
 256                if (err)
 257                        return err;
 258        }
 259
 260        memset(&context, 0, sizeof(context));
 261        context.args = args;
 262        context.write_entry = write_entry;
 263
 264        /*
 265         * Setup index and instruct attr to read index only
 266         */
 267        if (!args->worktree_attributes) {
 268                memset(&opts, 0, sizeof(opts));
 269                opts.index_only = 1;
 270                opts.head_idx = -1;
 271                opts.src_index = &the_index;
 272                opts.dst_index = &the_index;
 273                opts.fn = oneway_merge;
 274                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 275                if (unpack_trees(1, &t, &opts))
 276                        return -1;
 277                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 278        }
 279
 280        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 281                                  queue_or_write_archive_entry,
 282                                  &context);
 283        if (err == READ_TREE_RECURSIVE)
 284                err = 0;
 285        while (context.bottom) {
 286                struct directory *next = context.bottom->up;
 287                free(context.bottom);
 288                context.bottom = next;
 289        }
 290        return err;
 291}
 292
 293static const struct archiver *lookup_archiver(const char *name)
 294{
 295        int i;
 296
 297        if (!name)
 298                return NULL;
 299
 300        for (i = 0; i < nr_archivers; i++) {
 301                if (!strcmp(name, archivers[i]->name))
 302                        return archivers[i];
 303        }
 304        return NULL;
 305}
 306
 307static int reject_entry(const struct object_id *oid, struct strbuf *base,
 308                        const char *filename, unsigned mode,
 309                        int stage, void *context)
 310{
 311        int ret = -1;
 312        if (S_ISDIR(mode)) {
 313                struct strbuf sb = STRBUF_INIT;
 314                strbuf_addbuf(&sb, base);
 315                strbuf_addstr(&sb, filename);
 316                if (!match_pathspec(context, sb.buf, sb.len, 0, NULL, 1))
 317                        ret = READ_TREE_RECURSIVE;
 318                strbuf_release(&sb);
 319        }
 320        return ret;
 321}
 322
 323static int path_exists(struct tree *tree, const char *path)
 324{
 325        const char *paths[] = { path, NULL };
 326        struct pathspec pathspec;
 327        int ret;
 328
 329        parse_pathspec(&pathspec, 0, 0, "", paths);
 330        pathspec.recursive = 1;
 331        ret = read_tree_recursive(tree, "", 0, 0, &pathspec,
 332                                  reject_entry, &pathspec);
 333        clear_pathspec(&pathspec);
 334        return ret != 0;
 335}
 336
 337static void parse_pathspec_arg(const char **pathspec,
 338                struct archiver_args *ar_args)
 339{
 340        /*
 341         * must be consistent with parse_pathspec in path_exists()
 342         * Also if pathspec patterns are dependent, we're in big
 343         * trouble as we test each one separately
 344         */
 345        parse_pathspec(&ar_args->pathspec, 0,
 346                       PATHSPEC_PREFER_FULL,
 347                       "", pathspec);
 348        ar_args->pathspec.recursive = 1;
 349        if (pathspec) {
 350                while (*pathspec) {
 351                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 352                                die(_("pathspec '%s' did not match any files"), *pathspec);
 353                        pathspec++;
 354                }
 355        }
 356}
 357
 358static void parse_treeish_arg(const char **argv,
 359                struct archiver_args *ar_args, const char *prefix,
 360                int remote)
 361{
 362        const char *name = argv[0];
 363        const unsigned char *commit_sha1;
 364        time_t archive_time;
 365        struct tree *tree;
 366        const struct commit *commit;
 367        struct object_id oid;
 368
 369        /* Remotes are only allowed to fetch actual refs */
 370        if (remote && !remote_allow_unreachable) {
 371                char *ref = NULL;
 372                const char *colon = strchrnul(name, ':');
 373                int refnamelen = colon - name;
 374
 375                if (!dwim_ref(name, refnamelen, &oid, &ref))
 376                        die("no such ref: %.*s", refnamelen, name);
 377                free(ref);
 378        }
 379
 380        if (get_oid(name, &oid))
 381                die("Not a valid object name");
 382
 383        commit = lookup_commit_reference_gently(&oid, 1);
 384        if (commit) {
 385                commit_sha1 = commit->object.oid.hash;
 386                archive_time = commit->date;
 387        } else {
 388                commit_sha1 = NULL;
 389                archive_time = time(NULL);
 390        }
 391
 392        tree = parse_tree_indirect(&oid);
 393        if (tree == NULL)
 394                die("not a tree object");
 395
 396        if (prefix) {
 397                struct object_id tree_oid;
 398                unsigned int mode;
 399                int err;
 400
 401                err = get_tree_entry(&tree->object.oid, prefix, &tree_oid,
 402                                     &mode);
 403                if (err || !S_ISDIR(mode))
 404                        die("current working directory is untracked");
 405
 406                tree = parse_tree_indirect(&tree_oid);
 407        }
 408        ar_args->tree = tree;
 409        ar_args->commit_sha1 = commit_sha1;
 410        ar_args->commit = commit;
 411        ar_args->time = archive_time;
 412}
 413
 414#define OPT__COMPR(s, v, h, p) \
 415        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 416          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 417#define OPT__COMPR_HIDDEN(s, v, p) \
 418        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 419          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 420
 421static int parse_archive_args(int argc, const char **argv,
 422                const struct archiver **ar, struct archiver_args *args,
 423                const char *name_hint, int is_remote)
 424{
 425        const char *format = NULL;
 426        const char *base = NULL;
 427        const char *remote = NULL;
 428        const char *exec = NULL;
 429        const char *output = NULL;
 430        int compression_level = -1;
 431        int verbose = 0;
 432        int i;
 433        int list = 0;
 434        int worktree_attributes = 0;
 435        struct option opts[] = {
 436                OPT_GROUP(""),
 437                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 438                OPT_STRING(0, "prefix", &base, N_("prefix"),
 439                        N_("prepend prefix to each pathname in the archive")),
 440                OPT_STRING('o', "output", &output, N_("file"),
 441                        N_("write the archive to this file")),
 442                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 443                        N_("read .gitattributes in working directory")),
 444                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 445                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 446                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 447                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 448                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 449                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 450                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 451                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 452                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 453                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 454                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 455                OPT_GROUP(""),
 456                OPT_BOOL('l', "list", &list,
 457                        N_("list supported archive formats")),
 458                OPT_GROUP(""),
 459                OPT_STRING(0, "remote", &remote, N_("repo"),
 460                        N_("retrieve the archive from remote repository <repo>")),
 461                OPT_STRING(0, "exec", &exec, N_("command"),
 462                        N_("path to the remote git-upload-archive command")),
 463                OPT_END()
 464        };
 465
 466        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 467
 468        if (remote)
 469                die(_("Unexpected option --remote"));
 470        if (exec)
 471                die(_("Option --exec can only be used together with --remote"));
 472        if (output)
 473                die(_("Unexpected option --output"));
 474
 475        if (!base)
 476                base = "";
 477
 478        if (list) {
 479                for (i = 0; i < nr_archivers; i++)
 480                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 481                                printf("%s\n", archivers[i]->name);
 482                exit(0);
 483        }
 484
 485        if (!format && name_hint)
 486                format = archive_format_from_filename(name_hint);
 487        if (!format)
 488                format = "tar";
 489
 490        /* We need at least one parameter -- tree-ish */
 491        if (argc < 1)
 492                usage_with_options(archive_usage, opts);
 493        *ar = lookup_archiver(format);
 494        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 495                die(_("Unknown archive format '%s'"), format);
 496
 497        args->compression_level = Z_DEFAULT_COMPRESSION;
 498        if (compression_level != -1) {
 499                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 500                        args->compression_level = compression_level;
 501                else {
 502                        die(_("Argument not supported for format '%s': -%d"),
 503                                        format, compression_level);
 504                }
 505        }
 506        args->verbose = verbose;
 507        args->base = base;
 508        args->baselen = strlen(base);
 509        args->worktree_attributes = worktree_attributes;
 510
 511        return argc;
 512}
 513
 514int write_archive(int argc, const char **argv, const char *prefix,
 515                  const char *name_hint, int remote)
 516{
 517        const struct archiver *ar = NULL;
 518        struct archiver_args args;
 519
 520        git_config_get_bool("uploadarchive.allowunreachable", &remote_allow_unreachable);
 521        git_config(git_default_config, NULL);
 522
 523        init_tar_archiver();
 524        init_zip_archiver();
 525
 526        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 527        if (!startup_info->have_repository) {
 528                /*
 529                 * We know this will die() with an error, so we could just
 530                 * die ourselves; but its error message will be more specific
 531                 * than what we could write here.
 532                 */
 533                setup_git_directory();
 534        }
 535
 536        parse_treeish_arg(argv, &args, prefix, remote);
 537        parse_pathspec_arg(argv + 1, &args);
 538
 539        return ar->write_archive(ar, &args);
 540}
 541
 542static int match_extension(const char *filename, const char *ext)
 543{
 544        int prefixlen = strlen(filename) - strlen(ext);
 545
 546        /*
 547         * We need 1 character for the '.', and 1 character to ensure that the
 548         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 549         * filename).
 550         */
 551        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 552                return 0;
 553        return !strcmp(filename + prefixlen, ext);
 554}
 555
 556const char *archive_format_from_filename(const char *filename)
 557{
 558        int i;
 559
 560        for (i = 0; i < nr_archivers; i++)
 561                if (match_extension(filename, archivers[i]->name))
 562                        return archivers[i]->name;
 563        return NULL;
 564}