Andrew's git / gitweb.git / archive.c
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archive.con commit am doc: add a pointer to relevant hooks (0e3d40c)
   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;
  20
  21void register_archiver(struct archiver *ar)
  22{
  23        ALLOC_GROW(archivers, nr_archivers + 1, alloc_archivers);
  24        archivers[nr_archivers++] = ar;
  25}
  26
  27static void format_subst(const struct commit *commit,
  28                         const char *src, size_t len,
  29                         struct strbuf *buf)
  30{
  31        char *to_free = NULL;
  32        struct strbuf fmt = STRBUF_INIT;
  33        struct pretty_print_context ctx = {0};
  34        ctx.date_mode = DATE_NORMAL;
  35        ctx.abbrev = DEFAULT_ABBREV;
  36
  37        if (src == buf->buf)
  38                to_free = strbuf_detach(buf, NULL);
  39        for (;;) {
  40                const char *b, *c;
  41
  42                b = memmem(src, len, "$Format:", 8);
  43                if (!b)
  44                        break;
  45                c = memchr(b + 8, '$', (src + len) - b - 8);
  46                if (!c)
  47                        break;
  48
  49                strbuf_reset(&fmt);
  50                strbuf_add(&fmt, b + 8, c - b - 8);
  51
  52                strbuf_add(buf, src, b - src);
  53                format_commit_message(commit, fmt.buf, buf, &ctx);
  54                len -= c + 1 - src;
  55                src  = c + 1;
  56        }
  57        strbuf_add(buf, src, len);
  58        strbuf_release(&fmt);
  59        free(to_free);
  60}
  61
  62void *sha1_file_to_archive(const struct archiver_args *args,
  63                           const char *path, const unsigned char *sha1,
  64                           unsigned int mode, enum object_type *type,
  65                           unsigned long *sizep)
  66{
  67        void *buffer;
  68        const struct commit *commit = args->convert ? args->commit : NULL;
  69
  70        path += args->baselen;
  71        buffer = read_sha1_file(sha1, type, sizep);
  72        if (buffer && S_ISREG(mode)) {
  73                struct strbuf buf = STRBUF_INIT;
  74                size_t size = 0;
  75
  76                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  77                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  78                if (commit)
  79                        format_subst(commit, buf.buf, buf.len, &buf);
  80                buffer = strbuf_detach(&buf, &size);
  81                *sizep = size;
  82        }
  83
  84        return buffer;
  85}
  86
  87static void setup_archive_check(struct git_attr_check *check)
  88{
  89        static struct git_attr *attr_export_ignore;
  90        static struct git_attr *attr_export_subst;
  91
  92        if (!attr_export_ignore) {
  93                attr_export_ignore = git_attr("export-ignore");
  94                attr_export_subst = git_attr("export-subst");
  95        }
  96        check[0].attr = attr_export_ignore;
  97        check[1].attr = attr_export_subst;
  98}
  99
 100struct archiver_context {
 101        struct archiver_args *args;
 102        write_archive_entry_fn_t write_entry;
 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        struct archiver_context *c = context;
 111        struct archiver_args *args = c->args;
 112        write_archive_entry_fn_t write_entry = c->write_entry;
 113        struct git_attr_check check[2];
 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        setup_archive_check(check);
 128        if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 129                if (ATTR_TRUE(check[0].value))
 130                        return 0;
 131                args->convert = ATTR_TRUE(check[1].value);
 132        }
 133
 134        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 135                if (args->verbose)
 136                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 137                err = write_entry(args, sha1, path.buf, path.len, mode);
 138                if (err)
 139                        return err;
 140                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 141        }
 142
 143        if (args->verbose)
 144                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 145        return write_entry(args, sha1, path.buf, path.len, mode);
 146}
 147
 148int write_archive_entries(struct archiver_args *args,
 149                write_archive_entry_fn_t write_entry)
 150{
 151        struct archiver_context context;
 152        struct unpack_trees_options opts;
 153        struct tree_desc t;
 154        int err;
 155
 156        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 157                size_t len = args->baselen;
 158
 159                while (len > 1 && args->base[len - 2] == '/')
 160                        len--;
 161                if (args->verbose)
 162                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 163                err = write_entry(args, args->tree->object.sha1, args->base,
 164                                  len, 040777);
 165                if (err)
 166                        return err;
 167        }
 168
 169        context.args = args;
 170        context.write_entry = write_entry;
 171
 172        /*
 173         * Setup index and instruct attr to read index only
 174         */
 175        if (!args->worktree_attributes) {
 176                memset(&opts, 0, sizeof(opts));
 177                opts.index_only = 1;
 178                opts.head_idx = -1;
 179                opts.src_index = &the_index;
 180                opts.dst_index = &the_index;
 181                opts.fn = oneway_merge;
 182                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 183                if (unpack_trees(1, &t, &opts))
 184                        return -1;
 185                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 186        }
 187
 188        err = read_tree_recursive(args->tree, "", 0, 0, &args->pathspec,
 189                                  write_archive_entry, &context);
 190        if (err == READ_TREE_RECURSIVE)
 191                err = 0;
 192        return err;
 193}
 194
 195static const struct archiver *lookup_archiver(const char *name)
 196{
 197        int i;
 198
 199        if (!name)
 200                return NULL;
 201
 202        for (i = 0; i < nr_archivers; i++) {
 203                if (!strcmp(name, archivers[i]->name))
 204                        return archivers[i];
 205        }
 206        return NULL;
 207}
 208
 209static int reject_entry(const unsigned char *sha1, const char *base,
 210                        int baselen, const char *filename, unsigned mode,
 211                        int stage, void *context)
 212{
 213        return -1;
 214}
 215
 216static int path_exists(struct tree *tree, const char *path)
 217{
 218        const char *paths[] = { path, NULL };
 219        struct pathspec pathspec;
 220        int ret;
 221
 222        parse_pathspec(&pathspec, 0, 0, "", paths);
 223        ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 224        free_pathspec(&pathspec);
 225        return ret != 0;
 226}
 227
 228static void parse_pathspec_arg(const char **pathspec,
 229                struct archiver_args *ar_args)
 230{
 231        /*
 232         * must be consistent with parse_pathspec in path_exists()
 233         * Also if pathspec patterns are dependent, we're in big
 234         * trouble as we test each one separately
 235         */
 236        parse_pathspec(&ar_args->pathspec, 0,
 237                       PATHSPEC_PREFER_FULL,
 238                       "", pathspec);
 239        if (pathspec) {
 240                while (*pathspec) {
 241                        if (**pathspec && !path_exists(ar_args->tree, *pathspec))
 242                                die(_("pathspec '%s' did not match any files"), *pathspec);
 243                        pathspec++;
 244                }
 245        }
 246}
 247
 248static void parse_treeish_arg(const char **argv,
 249                struct archiver_args *ar_args, const char *prefix,
 250                int remote)
 251{
 252        const char *name = argv[0];
 253        const unsigned char *commit_sha1;
 254        time_t archive_time;
 255        struct tree *tree;
 256        const struct commit *commit;
 257        unsigned char sha1[20];
 258
 259        /* Remotes are only allowed to fetch actual refs */
 260        if (remote) {
 261                char *ref = NULL;
 262                const char *colon = strchr(name, ':');
 263                int refnamelen = colon ? colon - name : strlen(name);
 264
 265                if (!dwim_ref(name, refnamelen, sha1, &ref))
 266                        die("no such ref: %.*s", refnamelen, name);
 267                free(ref);
 268        }
 269
 270        if (get_sha1(name, sha1))
 271                die("Not a valid object name");
 272
 273        commit = lookup_commit_reference_gently(sha1, 1);
 274        if (commit) {
 275                commit_sha1 = commit->object.sha1;
 276                archive_time = commit->date;
 277        } else {
 278                commit_sha1 = NULL;
 279                archive_time = time(NULL);
 280        }
 281
 282        tree = parse_tree_indirect(sha1);
 283        if (tree == NULL)
 284                die("not a tree object");
 285
 286        if (prefix) {
 287                unsigned char tree_sha1[20];
 288                unsigned int mode;
 289                int err;
 290
 291                err = get_tree_entry(tree->object.sha1, prefix,
 292                                     tree_sha1, &mode);
 293                if (err || !S_ISDIR(mode))
 294                        die("current working directory is untracked");
 295
 296                tree = parse_tree_indirect(tree_sha1);
 297        }
 298        ar_args->tree = tree;
 299        ar_args->commit_sha1 = commit_sha1;
 300        ar_args->commit = commit;
 301        ar_args->time = archive_time;
 302}
 303
 304#define OPT__COMPR(s, v, h, p) \
 305        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 306          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 307#define OPT__COMPR_HIDDEN(s, v, p) \
 308        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 309          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 310
 311static int parse_archive_args(int argc, const char **argv,
 312                const struct archiver **ar, struct archiver_args *args,
 313                const char *name_hint, int is_remote)
 314{
 315        const char *format = NULL;
 316        const char *base = NULL;
 317        const char *remote = NULL;
 318        const char *exec = NULL;
 319        const char *output = NULL;
 320        int compression_level = -1;
 321        int verbose = 0;
 322        int i;
 323        int list = 0;
 324        int worktree_attributes = 0;
 325        struct option opts[] = {
 326                OPT_GROUP(""),
 327                OPT_STRING(0, "format", &format, N_("fmt"), N_("archive format")),
 328                OPT_STRING(0, "prefix", &base, N_("prefix"),
 329                        N_("prepend prefix to each pathname in the archive")),
 330                OPT_STRING('o', "output", &output, N_("file"),
 331                        N_("write the archive to this file")),
 332                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 333                        N_("read .gitattributes in working directory")),
 334                OPT__VERBOSE(&verbose, N_("report archived files on stderr")),
 335                OPT__COMPR('0', &compression_level, N_("store only"), 0),
 336                OPT__COMPR('1', &compression_level, N_("compress faster"), 1),
 337                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 338                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 339                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 340                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 341                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 342                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 343                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 344                OPT__COMPR('9', &compression_level, N_("compress better"), 9),
 345                OPT_GROUP(""),
 346                OPT_BOOL('l', "list", &list,
 347                        N_("list supported archive formats")),
 348                OPT_GROUP(""),
 349                OPT_STRING(0, "remote", &remote, N_("repo"),
 350                        N_("retrieve the archive from remote repository <repo>")),
 351                OPT_STRING(0, "exec", &exec, N_("command"),
 352                        N_("path to the remote git-upload-archive command")),
 353                OPT_END()
 354        };
 355
 356        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 357
 358        if (remote)
 359                die("Unexpected option --remote");
 360        if (exec)
 361                die("Option --exec can only be used together with --remote");
 362        if (output)
 363                die("Unexpected option --output");
 364
 365        if (!base)
 366                base = "";
 367
 368        if (list) {
 369                for (i = 0; i < nr_archivers; i++)
 370                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 371                                printf("%s\n", archivers[i]->name);
 372                exit(0);
 373        }
 374
 375        if (!format && name_hint)
 376                format = archive_format_from_filename(name_hint);
 377        if (!format)
 378                format = "tar";
 379
 380        /* We need at least one parameter -- tree-ish */
 381        if (argc < 1)
 382                usage_with_options(archive_usage, opts);
 383        *ar = lookup_archiver(format);
 384        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 385                die("Unknown archive format '%s'", format);
 386
 387        args->compression_level = Z_DEFAULT_COMPRESSION;
 388        if (compression_level != -1) {
 389                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 390                        args->compression_level = compression_level;
 391                else {
 392                        die("Argument not supported for format '%s': -%d",
 393                                        format, compression_level);
 394                }
 395        }
 396        args->verbose = verbose;
 397        args->base = base;
 398        args->baselen = strlen(base);
 399        args->worktree_attributes = worktree_attributes;
 400
 401        return argc;
 402}
 403
 404int write_archive(int argc, const char **argv, const char *prefix,
 405                  int setup_prefix, const char *name_hint, int remote)
 406{
 407        int nongit = 0;
 408        const struct archiver *ar = NULL;
 409        struct archiver_args args;
 410
 411        if (setup_prefix && prefix == NULL)
 412                prefix = setup_git_directory_gently(&nongit);
 413
 414        git_config(git_default_config, NULL);
 415        init_tar_archiver();
 416        init_zip_archiver();
 417
 418        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 419        if (nongit) {
 420                /*
 421                 * We know this will die() with an error, so we could just
 422                 * die ourselves; but its error message will be more specific
 423                 * than what we could write here.
 424                 */
 425                setup_git_directory();
 426        }
 427
 428        parse_treeish_arg(argv, &args, prefix, remote);
 429        parse_pathspec_arg(argv + 1, &args);
 430
 431        return ar->write_archive(ar, &args);
 432}
 433
 434static int match_extension(const char *filename, const char *ext)
 435{
 436        int prefixlen = strlen(filename) - strlen(ext);
 437
 438        /*
 439         * We need 1 character for the '.', and 1 character to ensure that the
 440         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 441         * filename).
 442         */
 443        if (prefixlen < 2 || filename[prefixlen - 1] != '.')
 444                return 0;
 445        return !strcmp(filename + prefixlen, ext);
 446}
 447
 448const char *archive_format_from_filename(const char *filename)
 449{
 450        int i;
 451
 452        for (i = 0; i < nr_archivers; i++)
 453                if (match_extension(filename, archivers[i]->name))
 454                        return archivers[i]->name;
 455        return NULL;
 456}