Andrew's git - gitweb.git/blob

   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
  17#define USES_ZLIB_COMPRESSION 1
  18
  19static const struct archiver {
  20        const char *name;
  21        write_archive_fn_t write_archive;
  22        unsigned int flags;
  23} archivers[] = {
  24        { "tar", write_tar_archive },
  25        { "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
  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
  63static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  64                unsigned int mode, enum object_type *type,
  65                unsigned long *sizep, const struct commit *commit)
  66{
  67        void *buffer;
  68
  69        buffer = read_sha1_file(sha1, type, sizep);
  70        if (buffer && S_ISREG(mode)) {
  71                struct strbuf buf = STRBUF_INIT;
  72                size_t size = 0;
  73
  74                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  75                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  76                if (commit)
  77                        format_subst(commit, buf.buf, buf.len, &buf);
  78                buffer = strbuf_detach(&buf, &size);
  79                *sizep = size;
  80        }
  81
  82        return buffer;
  83}
  84
  85static void setup_archive_check(struct git_attr_check *check)
  86{
  87        static struct git_attr *attr_export_ignore;
  88        static struct git_attr *attr_export_subst;
  89
  90        if (!attr_export_ignore) {
  91                attr_export_ignore = git_attr("export-ignore");
  92                attr_export_subst = git_attr("export-subst");
  93        }
  94        check[0].attr = attr_export_ignore;
  95        check[1].attr = attr_export_subst;
  96}
  97
  98struct archiver_context {
  99        struct archiver_args *args;
 100        write_archive_entry_fn_t write_entry;
 101};
 102
 103static int write_archive_entry(const unsigned char *sha1, const char *base,
 104                int baselen, const char *filename, unsigned mode, int stage,
 105                void *context)
 106{
 107        static struct strbuf path = STRBUF_INIT;
 108        struct archiver_context *c = context;
 109        struct archiver_args *args = c->args;
 110        write_archive_entry_fn_t write_entry = c->write_entry;
 111        struct git_attr_check check[2];
 112        const char *path_without_prefix;
 113        int convert = 0;
 114        int err;
 115        enum object_type type;
 116        unsigned long size;
 117        void *buffer;
 118
 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        path_without_prefix = path.buf + args->baselen;
 125
 126        setup_archive_check(check);
 127        if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
 128                if (ATTR_TRUE(check[0].value))
 129                        return 0;
 130                convert = ATTR_TRUE(check[1].value);
 131        }
 132
 133        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 134                strbuf_addch(&path, '/');
 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, NULL, 0);
 138                if (err)
 139                        return err;
 140                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 141        }
 142
 143        buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 144                        &type, &size, convert ? args->commit : NULL);
 145        if (!buffer)
 146                return error("cannot read %s", sha1_to_hex(sha1));
 147        if (args->verbose)
 148                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 149        err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 150        free(buffer);
 151        return err;
 152}
 153
 154int write_archive_entries(struct archiver_args *args,
 155                write_archive_entry_fn_t write_entry)
 156{
 157        struct archiver_context context;
 158        struct unpack_trees_options opts;
 159        struct tree_desc t;
 160        struct pathspec pathspec;
 161        int err;
 162
 163        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 164                size_t len = args->baselen;
 165
 166                while (len > 1 && args->base[len - 2] == '/')
 167                        len--;
 168                if (args->verbose)
 169                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 170                err = write_entry(args, args->tree->object.sha1, args->base,
 171                                len, 040777, NULL, 0);
 172                if (err)
 173                        return err;
 174        }
 175
 176        context.args = args;
 177        context.write_entry = write_entry;
 178
 179        /*
 180         * Setup index and instruct attr to read index only
 181         */
 182        if (!args->worktree_attributes) {
 183                memset(&opts, 0, sizeof(opts));
 184                opts.index_only = 1;
 185                opts.head_idx = -1;
 186                opts.src_index = &the_index;
 187                opts.dst_index = &the_index;
 188                opts.fn = oneway_merge;
 189                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 190                if (unpack_trees(1, &t, &opts))
 191                        return -1;
 192                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 193        }
 194
 195        init_pathspec(&pathspec, args->pathspec);
 196        err = read_tree_recursive(args->tree, "", 0, 0, &pathspec,
 197                                  write_archive_entry, &context);
 198        free_pathspec(&pathspec);
 199        if (err == READ_TREE_RECURSIVE)
 200                err = 0;
 201        return err;
 202}
 203
 204static const struct archiver *lookup_archiver(const char *name)
 205{
 206        int i;
 207
 208        if (!name)
 209                return NULL;
 210
 211        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 212                if (!strcmp(name, archivers[i].name))
 213                        return &archivers[i];
 214        }
 215        return NULL;
 216}
 217
 218static int reject_entry(const unsigned char *sha1, const char *base,
 219                        int baselen, const char *filename, unsigned mode,
 220                        int stage, void *context)
 221{
 222        return -1;
 223}
 224
 225static int path_exists(struct tree *tree, const char *path)
 226{
 227        const char *paths[] = { path, NULL };
 228        struct pathspec pathspec;
 229        int ret;
 230
 231        init_pathspec(&pathspec, paths);
 232        ret = read_tree_recursive(tree, "", 0, 0, &pathspec, reject_entry, NULL);
 233        free_pathspec(&pathspec);
 234        return ret != 0;
 235}
 236
 237static void parse_pathspec_arg(const char **pathspec,
 238                struct archiver_args *ar_args)
 239{
 240        ar_args->pathspec = pathspec = get_pathspec("", pathspec);
 241        if (pathspec) {
 242                while (*pathspec) {
 243                        if (!path_exists(ar_args->tree, *pathspec))
 244                                die("path not found: %s", *pathspec);
 245                        pathspec++;
 246                }
 247        }
 248}
 249
 250static void parse_treeish_arg(const char **argv,
 251                struct archiver_args *ar_args, const char *prefix)
 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        if (get_sha1(name, sha1))
 261                die("Not a valid object name");
 262
 263        commit = lookup_commit_reference_gently(sha1, 1);
 264        if (commit) {
 265                commit_sha1 = commit->object.sha1;
 266                archive_time = commit->date;
 267        } else {
 268                commit_sha1 = NULL;
 269                archive_time = time(NULL);
 270        }
 271
 272        tree = parse_tree_indirect(sha1);
 273        if (tree == NULL)
 274                die("not a tree object");
 275
 276        if (prefix) {
 277                unsigned char tree_sha1[20];
 278                unsigned int mode;
 279                int err;
 280
 281                err = get_tree_entry(tree->object.sha1, prefix,
 282                                     tree_sha1, &mode);
 283                if (err || !S_ISDIR(mode))
 284                        die("current working directory is untracked");
 285
 286                tree = parse_tree_indirect(tree_sha1);
 287        }
 288        ar_args->tree = tree;
 289        ar_args->commit_sha1 = commit_sha1;
 290        ar_args->commit = commit;
 291        ar_args->time = archive_time;
 292}
 293
 294#define OPT__COMPR(s, v, h, p) \
 295        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 296          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 297#define OPT__COMPR_HIDDEN(s, v, p) \
 298        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 299          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 300
 301static int parse_archive_args(int argc, const char **argv,
 302                const struct archiver **ar, struct archiver_args *args)
 303{
 304        const char *format = "tar";
 305        const char *base = NULL;
 306        const char *remote = NULL;
 307        const char *exec = NULL;
 308        const char *output = NULL;
 309        int compression_level = -1;
 310        int verbose = 0;
 311        int i;
 312        int list = 0;
 313        int worktree_attributes = 0;
 314        struct option opts[] = {
 315                OPT_GROUP(""),
 316                OPT_STRING(0, "format", &format, "fmt", "archive format"),
 317                OPT_STRING(0, "prefix", &base, "prefix",
 318                        "prepend prefix to each pathname in the archive"),
 319                OPT_STRING('o', "output", &output, "file",
 320                        "write the archive to this file"),
 321                OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
 322                        "read .gitattributes in working directory"),
 323                OPT__VERBOSE(&verbose, "report archived files on stderr"),
 324                OPT__COMPR('0', &compression_level, "store only", 0),
 325                OPT__COMPR('1', &compression_level, "compress faster", 1),
 326                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 327                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 328                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 329                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 330                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 331                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 332                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 333                OPT__COMPR('9', &compression_level, "compress better", 9),
 334                OPT_GROUP(""),
 335                OPT_BOOLEAN('l', "list", &list,
 336                        "list supported archive formats"),
 337                OPT_GROUP(""),
 338                OPT_STRING(0, "remote", &remote, "repo",
 339                        "retrieve the archive from remote repository <repo>"),
 340                OPT_STRING(0, "exec", &exec, "cmd",
 341                        "path to the remote git-upload-archive command"),
 342                OPT_END()
 343        };
 344
 345        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 346
 347        if (remote)
 348                die("Unexpected option --remote");
 349        if (exec)
 350                die("Option --exec can only be used together with --remote");
 351        if (output)
 352                die("Unexpected option --output");
 353
 354        if (!base)
 355                base = "";
 356
 357        if (list) {
 358                for (i = 0; i < ARRAY_SIZE(archivers); i++)
 359                        printf("%s\n", archivers[i].name);
 360                exit(0);
 361        }
 362
 363        /* We need at least one parameter -- tree-ish */
 364        if (argc < 1)
 365                usage_with_options(archive_usage, opts);
 366        *ar = lookup_archiver(format);
 367        if (!*ar)
 368                die("Unknown archive format '%s'", format);
 369
 370        args->compression_level = Z_DEFAULT_COMPRESSION;
 371        if (compression_level != -1) {
 372                if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 373                        args->compression_level = compression_level;
 374                else {
 375                        die("Argument not supported for format '%s': -%d",
 376                                        format, compression_level);
 377                }
 378        }
 379        args->verbose = verbose;
 380        args->base = base;
 381        args->baselen = strlen(base);
 382        args->worktree_attributes = worktree_attributes;
 383
 384        return argc;
 385}
 386
 387int write_archive(int argc, const char **argv, const char *prefix,
 388                int setup_prefix)
 389{
 390        const struct archiver *ar = NULL;
 391        struct archiver_args args;
 392
 393        argc = parse_archive_args(argc, argv, &ar, &args);
 394        if (setup_prefix && prefix == NULL)
 395                prefix = setup_git_directory();
 396
 397        parse_treeish_arg(argv, &args, prefix);
 398        parse_pathspec_arg(argv + 1, &args);
 399
 400        git_config(git_default_config, NULL);
 401
 402        return ar->write_archive(&args);
 403}