Andrew's git / gitweb.git / archive.c
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archive.con commit fmt-merge-msg: plug small leak of commit buffer (1154aa4)
   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;
  20static int remote_allow_unreachable;
  21
  22void register_archiver(struct archiver *ar)
  23{
  24        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  25        archivers[nr_archivers++] = ar;
  26}
  27
  28static void format_subst(const struct commit *commit,
  29                         const char *src, size_t len,
  30                         struct strbuf *buf)
  31{
  32        char *to_free = NULL;
  33        struct strbuf fmt = STRBUF_INIT;
  34        struct pretty_print_context ctx = {0};
  35        ctx.date_mode = DATE_NORMAL;
  36        ctx.abbrev = DEFAULT_ABBREV;
  37
  38        if (src == buf->buf)
  39                to_free = strbuf_detach(buf, NULL);
  40        for (;;) {
  41                const char *b, *c;
  42
  43                b = memmem(src, len, "$Format:", 8);
  44                if (!b)
  45                        break;
  46                c = memchr(b + 8, '$', (src + len) - b - 8);
  47                if (!c)
  48                        break;
  49
  50                strbuf_reset(&fmt);
  51                strbuf_add(&fmt, b + 8, c - b - 8);
  52
  53                strbuf_add(buf, src, b - src);
  54                format_commit_message(commit, fmt.buf, buf, &ctx);
  55                len -= c + 1 - src;
  56                src  = c + 1;
  57        }
  58        strbuf_add(buf, src, len);
  59        strbuf_release(&fmt);
  60        free(to_free);
  61}
  62
  63void *sha1_file_to_archive(const struct archiver_args *args,
  64                           const char *path, const unsigned char *sha1,
  65                           unsigned int mode, enum object_type *type,
  66                           unsigned long *sizep)
  67{
  68        void *buffer;
  69        const struct commit *commit = args->convert ? args->commit : NULL;
  70
  71        path += args->baselen;
  72        buffer = read_sha1_file(sha1, type, sizep);
  73        if (buffer && S_ISREG(mode)) {
  74                struct strbuf buf = STRBUF_INIT;
  75                size_t size = 0;
  76
  77                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  78                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  79                if (commit)
  80                        format_subst(commit, buf.buf, buf.len, &buf);
  81                buffer = strbuf_detach(&buf, &size);
  82                *sizep = size;
  83        }
  84
  85        return buffer;
  86}
  87
  88static void setup_archive_check(struct git_attr_check *check)
  89{
  90        static struct git_attr *attr_export_ignore;
  91        static struct git_attr *attr_export_subst;
  92
  93        if (!attr_export_ignore) {
  94                attr_export_ignore = git_attr("export-ignore");
  95                attr_export_subst = git_attr("export-subst");
  96        }
  97        check[0].attr = attr_export_ignore;
  98        check[1].attr = attr_export_subst;
  99}
 100
 101struct archiver_context {
 102        struct archiver_args *args;
 103        write_archive_entry_fn_t write_entry;
 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        struct archiver_context *c = context;
 112        struct archiver_args *args = c->args;
 113        write_archive_entry_fn_t write_entry = c->write_entry;
 114        struct git_attr_check check[2];
 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        setup_archive_check(check);
 129        if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 130                if (ATTR_TRUE(check[0].value))
 131                        return 0;
 132                args->convert = ATTR_TRUE(check[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
 149int write_archive_entries(struct archiver_args *args,
 150                write_archive_entry_fn_t write_entry)
 151{
 152        struct archiver_context context;
 153        struct unpack_trees_options opts;
 154        struct tree_desc t;
 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        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 190                                  write_archive_entry, &context);
 191        if (err == READ_TREE_RECURSIVE)
 192                err = 0;
 193        return err;
 194}
 195
 196static const struct archiver *lookup_archiver(const char *name)
 197{
 198        int i;
 199
 200        if (!name)
 201                return NULL;
 202
 203        for (i = 0; i < nr_archivers; i++) {
 204                if (!strcmp(name, archivers[i]->name))
 205                        return archivers[i];
 206        }
 207        return NULL;
 208}
 209
 210static int reject_entry(const unsigned char *sha1, const char *base,
 211                        int baselen, const char *filename, unsigned mode,
 212                        int stage, void *context)
 213{
 214        return -1;
 215}
 216
 217static int path_exists(struct tree *tree, const char *path)
 218{
 219        const char *paths[] = { path, NULL };
 220        struct pathspec pathspec;
 221        int ret;
 222
 223        parse_pathspec(&pathspec, 0, 0, "", paths);
 224        ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 225        free_pathspec(&pathspec);
 226        return ret != 0;
 227}
 228
 229static void parse_pathspec_arg(const char **pathspec,
 230                struct archiver_args *ar_args)
 231{
 232        /*
 233         * must be consistent with parse_pathspec in path_exists()
 234         * Also if pathspec patterns are dependent, we're in big
 235         * trouble as we test each one separately
 236         */
 237        parse_pathspec(&ar_args->pathspec, 0,
 238                       PATHSPEC_PREFER_FULL,
 239                       "", pathspec);
 240        if (pathspec) {
 241                while (*pathspec) {
 242                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 243                                die(_("pathspec '%s' did not match any files"), *pathspec);
 244                        pathspec++;
 245                }
 246        }
 247}
 248
 249static void parse_treeish_arg(const char **argv,
 250                struct archiver_args *ar_args, const char *prefix,
 251                int remote)
 252{
 253        const char *name = argv[0];
 254        const unsigned char *commit_sha1;
 255        time_t archive_time;
 256        struct tree *tree;
 257        const struct commit *commit;
 258        unsigned char sha1[20];
 259
 260        /* Remotes are only allowed to fetch actual refs */
 261        if (remote && !remote_allow_unreachable) {
 262                char *ref = NULL;
 263                const char *colon = strchrnul(name, ':');
 264                int refnamelen = colon - name;
 265
 266                if (!dwim_ref(name, refnamelen, sha1, &ref))
 267                        die("no such ref: %.*s", refnamelen, name);
 268                free(ref);
 269        }
 270
 271        if (get_sha1(name, sha1))
 272                die("Not a valid object name");
 273
 274        commit = lookup_commit_reference_gently(sha1, 1);
 275        if (commit) {
 276                commit_sha1 = commit->object.sha1;
 277                archive_time = commit->date;
 278        } else {
 279                commit_sha1 = NULL;
 280                archive_time = time(NULL);
 281        }
 282
 283        tree = parse_tree_indirect(sha1);
 284        if (tree == NULL)
 285                die("not a tree object");
 286
 287        if (prefix) {
 288                unsigned char tree_sha1[20];
 289                unsigned int mode;
 290                int err;
 291
 292                err = get_tree_entry(tree->object.sha1, prefix,
 293                                     tree_sha1, &mode);
 294                if (err || !S_ISDIR(mode))
 295                        die("current working directory is untracked");
 296
 297                tree = parse_tree_indirect(tree_sha1);
 298        }
 299        ar_args->tree = tree;
 300        ar_args->commit_sha1 = commit_sha1;
 301        ar_args->commit = commit;
 302        ar_args->time = archive_time;
 303}
 304
 305#define OPT__COMPR(s, v, h, p) \
 306        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 307          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 308#define OPT__COMPR_HIDDEN(s, v, p) \
 309        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 310          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 311
 312static int parse_archive_args(int argc, const char **argv,
 313                const struct archiver **ar, struct archiver_args *args,
 314                const char *name_hint, int is_remote)
 315{
 316        const char *format = NULL;
 317        const char *base = NULL;
 318        const char *remote = NULL;
 319        const char *exec = NULL;
 320        const char *output = NULL;
 321        int compression_level = -1;
 322        int verbose = 0;
 323        int i;
 324        int list = 0;
 325        int worktree_attributes = 0;
 326        struct option opts[] = {
 327                OPT_GROUP(""),
 328                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 329                OPT_STRING(0, "prefix", &base, N_("prefix"),
 330                        N_("prepend prefix to each pathname in the archive")),
 331                OPT_STRING('o', "output", &output, N_("file"),
 332                        N_("write the archive to this file")),
 333                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 334                        N_("read .gitattributes in working directory")),
 335                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 336                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 337                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 338                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 339                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 340                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 341                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 342                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 343                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 344                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 345                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 346                OPT_GROUP(""),
 347                OPT_BOOL('l', "list", &list,
 348                        N_("list supported archive formats")),
 349                OPT_GROUP(""),
 350                OPT_STRING(0, "remote", &remote, N_("repo"),
 351                        N_("retrieve the archive from remote repository <repo>")),
 352                OPT_STRING(0, "exec", &exec, N_("command"),
 353                        N_("path to the remote git-upload-archive command")),
 354                OPT_END()
 355        };
 356
 357        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 358
 359        if (remote)
 360                die("Unexpected option --remote");
 361        if (exec)
 362                die("Option --exec can only be used together with --remote");
 363        if (output)
 364                die("Unexpected option --output");
 365
 366        if (!base)
 367                base = "";
 368
 369        if (list) {
 370                for (i = 0; i < nr_archivers; i++)
 371                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 372                                printf("%s\n", archivers[i]->name);
 373                exit(0);
 374        }
 375
 376        if (!format && name_hint)
 377                format = archive_format_from_filename(name_hint);
 378        if (!format)
 379                format = "tar";
 380
 381        /* We need at least one parameter -- tree-ish */
 382        if (argc < 1)
 383                usage_with_options(archive_usage, opts);
 384        *ar = lookup_archiver(format);
 385        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 386                die("Unknown archive format '%s'", format);
 387
 388        args->compression_level = Z_DEFAULT_COMPRESSION;
 389        if (compression_level != -1) {
 390                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 391                        args->compression_level = compression_level;
 392                else {
 393                        die("Argument not supported for format '%s': -%d",
 394                                        format, compression_level);
 395                }
 396        }
 397        args->verbose = verbose;
 398        args->base = base;
 399        args->baselen = strlen(base);
 400        args->worktree_attributes = worktree_attributes;
 401
 402        return argc;
 403}
 404
 405static int git_default_archive_config(const char *var, const char *value,
 406                                      void *cb)
 407{
 408        if (!strcmp(var, "uploadarchive.allowunreachable"))
 409                remote_allow_unreachable = git_config_bool(var, value);
 410        return git_default_config(var, value, cb);
 411}
 412
 413int write_archive(int argc, const char **argv, const char *prefix,
 414                  int setup_prefix, const char *name_hint, int remote)
 415{
 416        int nongit = 0;
 417        const struct archiver *ar = NULL;
 418        struct archiver_args args;
 419
 420        if (setup_prefix && prefix == NULL)
 421                prefix = setup_git_directory_gently(&nongit);
 422
 423        git_config(git_default_archive_config, NULL);
 424        init_tar_archiver();
 425        init_zip_archiver();
 426
 427        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 428        if (nongit) {
 429                /*
 430                 * We know this will die() with an error, so we could just
 431                 * die ourselves; but its error message will be more specific
 432                 * than what we could write here.
 433                 */
 434                setup_git_directory();
 435        }
 436
 437        parse_treeish_arg(argv, &args, prefix, remote);
 438        parse_pathspec_arg(argv + 1, &args);
 439
 440        return ar->write_archive(ar, &args);
 441}
 442
 443static int match_extension(const char *filename, const char *ext)
 444{
 445        int prefixlen = strlen(filename) - strlen(ext);
 446
 447        /*
 448         * We need 1 character for the '.', and 1 character to ensure that the
 449         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 450         * filename).
 451         */
 452        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 453                return 0;
 454        return !strcmp(filename + prefixlen, ext);
 455}
 456
 457const char *archive_format_from_filename(const char *filename)
 458{
 459        int i;
 460
 461        for (i = 0; i < nr_archivers; i++)
 462                if (match_extension(filename, archivers[i]->name))
 463                        return archivers[i]->name;
 464        return NULL;
 465}