Andrew's git / gitweb.git / archive.c
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archive.con commit contrib/diffall: eliminate use of tar (e33e01d)
   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        "git archive [options] <tree-ish> [<path>...]",
  11        "git archive --list",
  12        "git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [<path>...]",
  13        "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
  62static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  63                unsigned int mode, enum object_type *type,
  64                unsigned long *sizep, const struct commit *commit)
  65{
  66        void *buffer;
  67
  68        buffer = read_sha1_file(sha1, type, sizep);
  69        if (buffer && S_ISREG(mode)) {
  70                struct strbuf buf = STRBUF_INIT;
  71                size_t size = 0;
  72
  73                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  74                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  75                if (commit)
  76                        format_subst(commit, buf.buf, buf.len, &buf);
  77                buffer = strbuf_detach(&buf, &size);
  78                *sizep = size;
  79        }
  80
  81        return buffer;
  82}
  83
  84static void setup_archive_check(struct git_attr_check *check)
  85{
  86        static struct git_attr *attr_export_ignore;
  87        static struct git_attr *attr_export_subst;
  88
  89        if (!attr_export_ignore) {
  90                attr_export_ignore = git_attr("export-ignore");
  91                attr_export_subst = git_attr("export-subst");
  92        }
  93        check[0].attr = attr_export_ignore;
  94        check[1].attr = attr_export_subst;
  95}
  96
  97struct archiver_context {
  98        struct archiver_args *args;
  99        write_archive_entry_fn_t write_entry;
 100};
 101
 102static int write_archive_entry(const unsigned char *sha1, const char *base,
 103                int baselen, const char *filename, unsigned mode, int stage,
 104                void *context)
 105{
 106        static struct strbuf path = STRBUF_INIT;
 107        struct archiver_context *c = context;
 108        struct archiver_args *args = c->args;
 109        write_archive_entry_fn_t write_entry = c->write_entry;
 110        struct git_attr_check check[2];
 111        const char *path_without_prefix;
 112        int convert = 0;
 113        int err;
 114        enum object_type type;
 115        unsigned long size;
 116        void *buffer;
 117
 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        path_without_prefix = path.buf + args->baselen;
 124
 125        setup_archive_check(check);
 126        if (!git_check_attr(path_without_prefix, ARRAY_SIZE(check), check)) {
 127                if (ATTR_TRUE(check[0].value))
 128                        return 0;
 129                convert = ATTR_TRUE(check[1].value);
 130        }
 131
 132        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 133                strbuf_addch(&path, '/');
 134                if (args->verbose)
 135                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 136                err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
 137                if (err)
 138                        return err;
 139                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 140        }
 141
 142        buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 143                        &type, &size, convert ? args->commit : NULL);
 144        if (!buffer)
 145                return error("cannot read %s", sha1_to_hex(sha1));
 146        if (args->verbose)
 147                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 148        err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 149        free(buffer);
 150        return err;
 151}
 152
 153int write_archive_entries(struct archiver_args *args,
 154                write_archive_entry_fn_t write_entry)
 155{
 156        struct archiver_context context;
 157        struct unpack_trees_options opts;
 158        struct tree_desc t;
 159        struct pathspec pathspec;
 160        int err;
 161
 162        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 163                size_t len = args->baselen;
 164
 165                while (len > 1 && args->base[len - 2] == '/')
 166                        len--;
 167                if (args->verbose)
 168                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 169                err = write_entry(args, args->tree->object.sha1, args->base,
 170                                len, 040777, NULL, 0);
 171                if (err)
 172                        return err;
 173        }
 174
 175        context.args = args;
 176        context.write_entry = write_entry;
 177
 178        /*
 179         * Setup index and instruct attr to read index only
 180         */
 181        if (!args->worktree_attributes) {
 182                memset(&opts, 0, sizeof(opts));
 183                opts.index_only = 1;
 184                opts.head_idx = -1;
 185                opts.src_index = &the_index;
 186                opts.dst_index = &the_index;
 187                opts.fn = oneway_merge;
 188                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 189                if (unpack_trees(1, &t, &opts))
 190                        return -1;
 191                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 192        }
 193
 194        init_pathspec(&pathspec, args->pathspec);
 195        err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
 196                                  write_archive_entry, &context);
 197        free_pathspec(&pathspec);
 198        if (err == READ_TREE_RECURSIVE)
 199                err = 0;
 200        return err;
 201}
 202
 203static const struct archiver *lookup_archiver(const char *name)
 204{
 205        int i;
 206
 207        if (!name)
 208                return NULL;
 209
 210        for (i = 0; i < nr_archivers; i++) {
 211                if (!strcmp(name, archivers[i]->name))
 212                        return archivers[i];
 213        }
 214        return NULL;
 215}
 216
 217static int reject_entry(const unsigned char *sha1, const char *base,
 218                        int baselen, const char *filename, unsigned mode,
 219                        int stage, void *context)
 220{
 221        return -1;
 222}
 223
 224static int path_exists(struct tree *tree, const char *path)
 225{
 226        const char *paths[] = { path, NULL };
 227        struct pathspec pathspec;
 228        int ret;
 229
 230        init_pathspec(&pathspec, paths);
 231        ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 232        free_pathspec(&pathspec);
 233        return ret != 0;
 234}
 235
 236static void parse_pathspec_arg(const char **pathspec,
 237                struct archiver_args *ar_args)
 238{
 239        ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 240        if (pathspec) {
 241                while (*pathspec) {
 242                        if (!path_exists(ar_args->tree, *pathspec))
 243                                die("path not found: %s", *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) {
 262                char *ref = NULL;
 263                const char *refname, *colon = NULL;
 264
 265                colon = strchr(name, ':');
 266                if (colon)
 267                        refname = xstrndup(name, colon - name);
 268                else
 269                        refname = name;
 270
 271                if (!dwim_ref(refname, strlen(refname), sha1, &ref))
 272                        die("no such ref: %s", refname);
 273                if (refname != name)
 274                        free((void *)refname);
 275                free(ref);
 276        }
 277
 278        if (get_sha1(name, sha1))
 279                die("Not a valid object name");
 280
 281        commit = lookup_commit_reference_gently(sha1, 1);
 282        if (commit) {
 283                commit_sha1 = commit->object.sha1;
 284                archive_time = commit->date;
 285        } else {
 286                commit_sha1 = NULL;
 287                archive_time = time(NULL);
 288        }
 289
 290        tree = parse_tree_indirect(sha1);
 291        if (tree == NULL)
 292                die("not a tree object");
 293
 294        if (prefix) {
 295                unsigned char tree_sha1[20];
 296                unsigned int mode;
 297                int err;
 298
 299                err = get_tree_entry(tree->object.sha1, prefix,
 300                                     tree_sha1, &mode);
 301                if (err || !S_ISDIR(mode))
 302                        die("current working directory is untracked");
 303
 304                tree = parse_tree_indirect(tree_sha1);
 305        }
 306        ar_args->tree = tree;
 307        ar_args->commit_sha1 = commit_sha1;
 308        ar_args->commit = commit;
 309        ar_args->time = archive_time;
 310}
 311
 312#define OPT__COMPR(s, v, h, p) \
 313        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 314          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 315#define OPT__COMPR_HIDDEN(s, v, p) \
 316        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 317          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 318
 319static int parse_archive_args(int argc, const char **argv,
 320                const struct archiver **ar, struct archiver_args *args,
 321                const char *name_hint, int is_remote)
 322{
 323        const char *format = NULL;
 324        const char *base = NULL;
 325        const char *remote = NULL;
 326        const char *exec = NULL;
 327        const char *output = NULL;
 328        int compression_level = -1;
 329        int verbose = 0;
 330        int i;
 331        int list = 0;
 332        int worktree_attributes = 0;
 333        struct option opts[] = {
 334                OPT_GROUP(""),
 335                OPT_STRING(0, "format", &format, "fmt", "archive format"),
 336                OPT_STRING(0, "prefix", &base, "prefix",
 337                        "prepend prefix to each pathname in the archive"),
 338                OPT_STRING('o', "output", &output, "file",
 339                        "write the archive to this file"),
 340                OPT_BOOL(0, "worktree-attributes", &worktree_attributes,
 341                        "read .gitattributes in working directory"),
 342                OPT__VERBOSE(&verbose, "report archived files on stderr"),
 343                OPT__COMPR('0', &compression_level, "store only", 0),
 344                OPT__COMPR('1', &compression_level, "compress faster", 1),
 345                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 346                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 347                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 348                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 349                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 350                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 351                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 352                OPT__COMPR('9', &compression_level, "compress better", 9),
 353                OPT_GROUP(""),
 354                OPT_BOOL('l', "list", &list,
 355                        "list supported archive formats"),
 356                OPT_GROUP(""),
 357                OPT_STRING(0, "remote", &remote, "repo",
 358                        "retrieve the archive from remote repository <repo>"),
 359                OPT_STRING(0, "exec", &exec, "cmd",
 360                        "path to the remote git-upload-archive command"),
 361                OPT_END()
 362        };
 363
 364        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 365
 366        if (remote)
 367                die("Unexpected option --remote");
 368        if (exec)
 369                die("Option --exec can only be used together with --remote");
 370        if (output)
 371                die("Unexpected option --output");
 372
 373        if (!base)
 374                base = "";
 375
 376        if (list) {
 377                for (i = 0; i < nr_archivers; i++)
 378                        if (!is_remote || archivers[i]->flags & ARCHIVER_REMOTE)
 379                                printf("%s\n", archivers[i]->name);
 380                exit(0);
 381        }
 382
 383        if (!format && name_hint)
 384                format = archive_format_from_filename(name_hint);
 385        if (!format)
 386                format = "tar";
 387
 388        /* We need at least one parameter -- tree-ish */
 389        if (argc < 1)
 390                usage_with_options(archive_usage, opts);
 391        *ar = lookup_archiver(format);
 392        if (!*ar || (is_remote && !((*ar)->flags & ARCHIVER_REMOTE)))
 393                die("Unknown archive format '%s'", format);
 394
 395        args->compression_level = Z_DEFAULT_COMPRESSION;
 396        if (compression_level != -1) {
 397                if ((*ar)->flags & ARCHIVER_WANT_COMPRESSION_LEVELS)
 398                        args->compression_level = compression_level;
 399                else {
 400                        die("Argument not supported for format '%s': -%d",
 401                                        format, compression_level);
 402                }
 403        }
 404        args->verbose = verbose;
 405        args->base = base;
 406        args->baselen = strlen(base);
 407        args->worktree_attributes = worktree_attributes;
 408
 409        return argc;
 410}
 411
 412int write_archive(int argc, const char **argv, const char *prefix,
 413                  int setup_prefix, const char *name_hint, int remote)
 414{
 415        int nongit = 0;
 416        const struct archiver *ar = NULL;
 417        struct archiver_args args;
 418
 419        if (setup_prefix && prefix == NULL)
 420                prefix = setup_git_directory_gently(&nongit);
 421
 422        git_config(git_default_config, NULL);
 423        init_tar_archiver();
 424        init_zip_archiver();
 425
 426        argc = parse_archive_args(argc, argv, &ar, &args, name_hint, remote);
 427        if (nongit) {
 428                /*
 429                 * We know this will die() with an error, so we could just
 430                 * die ourselves; but its error message will be more specific
 431                 * than what we could write here.
 432                 */
 433                setup_git_directory();
 434        }
 435
 436        parse_treeish_arg(argv, &args, prefix, remote);
 437        parse_pathspec_arg(argv + 1, &args);
 438
 439        return ar->write_archive(ar, &args);
 440}
 441
 442static int match_extension(const char *filename, const char *ext)
 443{
 444        int prefixlen = strlen(filename) - strlen(ext);
 445
 446        /*
 447         * We need 1 character for the '.', and 1 character to ensure that the
 448         * prefix is non-empty (k.e., we don't match .tar.gz with no actual
 449         * filename).
 450         */
 451        if (prefixlen < 2 || filename[prefixlen-1] != '.')
 452                return 0;
 453        return !strcmp(filename + prefixlen, ext);
 454}
 455
 456const char *archive_format_from_filename(const char *filename)
 457{
 458        int i;
 459
 460        for (i = 0; i < nr_archivers; i++)
 461                if (match_extension(filename, archivers[i]->name))
 462                        return archivers[i]->name;
 463        return NULL;
 464}