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
  35        if (src == buf->buf)
  36                to_free = strbuf_detach(buf, NULL);
  37        for (;;) {
  38                const char *b, *c;
  39
  40                b = memmem(src, len, "$Format:", 8);
  41                if (!b)
  42                        break;
  43                c = memchr(b + 8, '$', (src + len) - b - 8);
  44                if (!c)
  45                        break;
  46
  47                strbuf_reset(&fmt);
  48                strbuf_add(&fmt, b + 8, c - b - 8);
  49
  50                strbuf_add(buf, src, b - src);
  51                format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
  52                len -= c + 1 - src;
  53                src  = c + 1;
  54        }
  55        strbuf_add(buf, src, len);
  56        strbuf_release(&fmt);
  57        free(to_free);
  58}
  59
  60static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
  61                unsigned int mode, enum object_type *type,
  62                unsigned long *sizep, const struct commit *commit)
  63{
  64        void *buffer;
  65
  66        buffer = read_sha1_file(sha1, type, sizep);
  67        if (buffer && S_ISREG(mode)) {
  68                struct strbuf buf = STRBUF_INIT;
  69                size_t size = 0;
  70
  71                strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
  72                convert_to_working_tree(path, buf.buf, buf.len, &buf);
  73                if (commit)
  74                        format_subst(commit, buf.buf, buf.len, &buf);
  75                buffer = strbuf_detach(&buf, &size);
  76                *sizep = size;
  77        }
  78
  79        return buffer;
  80}
  81
  82static void setup_archive_check(struct git_attr_check *check)
  83{
  84        static struct git_attr *attr_export_ignore;
  85        static struct git_attr *attr_export_subst;
  86
  87        if (!attr_export_ignore) {
  88                attr_export_ignore = git_attr("export-ignore", 13);
  89                attr_export_subst = git_attr("export-subst", 12);
  90        }
  91        check[0].attr = attr_export_ignore;
  92        check[1].attr = attr_export_subst;
  93}
  94
  95struct archiver_context {
  96        struct archiver_args *args;
  97        write_archive_entry_fn_t write_entry;
  98};
  99
 100static int write_archive_entry(const unsigned char *sha1, const char *base,
 101                int baselen, const char *filename, unsigned mode, int stage,
 102                void *context)
 103{
 104        static struct strbuf path = STRBUF_INIT;
 105        struct archiver_context *c = context;
 106        struct archiver_args *args = c->args;
 107        write_archive_entry_fn_t write_entry = c->write_entry;
 108        struct git_attr_check check[2];
 109        const char *path_without_prefix;
 110        int convert = 0;
 111        int err;
 112        enum object_type type;
 113        unsigned long size;
 114        void *buffer;
 115
 116        strbuf_reset(&path);
 117        strbuf_grow(&path, PATH_MAX);
 118        strbuf_add(&path, args->base, args->baselen);
 119        strbuf_add(&path, base, baselen);
 120        strbuf_addstr(&path, filename);
 121        path_without_prefix = path.buf + args->baselen;
 122
 123        setup_archive_check(check);
 124        if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
 125                if (ATTR_TRUE(check[0].value))
 126                        return 0;
 127                convert = ATTR_TRUE(check[1].value);
 128        }
 129
 130        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 131                strbuf_addch(&path, '/');
 132                if (args->verbose)
 133                        fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 134                err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
 135                if (err)
 136                        return err;
 137                return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 138        }
 139
 140        buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
 141                        &type, &size, convert ? args->commit : NULL);
 142        if (!buffer)
 143                return error("cannot read %s", sha1_to_hex(sha1));
 144        if (args->verbose)
 145                fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
 146        err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
 147        free(buffer);
 148        return err;
 149}
 150
 151int write_archive_entries(struct archiver_args *args,
 152                write_archive_entry_fn_t write_entry)
 153{
 154        struct archiver_context context;
 155        struct unpack_trees_options opts;
 156        struct tree_desc t;
 157        int err;
 158
 159        if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
 160                size_t len = args->baselen;
 161
 162                while (len > 1 && args->base[len - 2] == '/')
 163                        len--;
 164                if (args->verbose)
 165                        fprintf(stderr, "%.*s\n", (int)len, args->base);
 166                err = write_entry(args, args->tree->object.sha1, args->base,
 167                                len, 040777, NULL, 0);
 168                if (err)
 169                        return err;
 170        }
 171
 172        context.args = args;
 173        context.write_entry = write_entry;
 174
 175        /*
 176         * Setup index and instruct attr to read index only
 177         */
 178        if (!args->worktree_attributes) {
 179                memset(&opts, 0, sizeof(opts));
 180                opts.index_only = 1;
 181                opts.head_idx = -1;
 182                opts.src_index = &the_index;
 183                opts.dst_index = &the_index;
 184                opts.fn = oneway_merge;
 185                init_tree_desc(&t, args->tree->buffer, args->tree->size);
 186                if (unpack_trees(1, &t, &opts))
 187                        return -1;
 188                git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
 189        }
 190
 191        err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec,
 192                                  write_archive_entry, &context);
 193        if (err == READ_TREE_RECURSIVE)
 194                err = 0;
 195        return err;
 196}
 197
 198static const struct archiver *lookup_archiver(const char *name)
 199{
 200        int i;
 201
 202        if (!name)
 203                return NULL;
 204
 205        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 206                if (!strcmp(name, archivers[i].name))
 207                        return &archivers[i];
 208        }
 209        return NULL;
 210}
 211
 212static void parse_pathspec_arg(const char **pathspec,
 213                struct archiver_args *ar_args)
 214{
 215        ar_args->pathspec = get_pathspec("", pathspec);
 216}
 217
 218static void parse_treeish_arg(const char **argv,
 219                struct archiver_args *ar_args, const char *prefix)
 220{
 221        const char *name = argv[0];
 222        const unsigned char *commit_sha1;
 223        time_t archive_time;
 224        struct tree *tree;
 225        const struct commit *commit;
 226        unsigned char sha1[20];
 227
 228        if (get_sha1(name, sha1))
 229                die("Not a valid object name");
 230
 231        commit = lookup_commit_reference_gently(sha1, 1);
 232        if (commit) {
 233                commit_sha1 = commit->object.sha1;
 234                archive_time = commit->date;
 235        } else {
 236                commit_sha1 = NULL;
 237                archive_time = time(NULL);
 238        }
 239
 240        tree = parse_tree_indirect(sha1);
 241        if (tree == NULL)
 242                die("not a tree object");
 243
 244        if (prefix) {
 245                unsigned char tree_sha1[20];
 246                unsigned int mode;
 247                int err;
 248
 249                err = get_tree_entry(tree->object.sha1, prefix,
 250                                     tree_sha1, &mode);
 251                if (err || !S_ISDIR(mode))
 252                        die("current working directory is untracked");
 253
 254                tree = parse_tree_indirect(tree_sha1);
 255        }
 256        ar_args->tree = tree;
 257        ar_args->commit_sha1 = commit_sha1;
 258        ar_args->commit = commit;
 259        ar_args->time = archive_time;
 260}
 261
 262#define OPT__COMPR(s, v, h, p) \
 263        { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
 264          PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
 265#define OPT__COMPR_HIDDEN(s, v, p) \
 266        { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
 267          PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
 268
 269static int parse_archive_args(int argc, const char **argv,
 270                const struct archiver **ar, struct archiver_args *args)
 271{
 272        const char *format = "tar";
 273        const char *base = NULL;
 274        const char *remote = NULL;
 275        const char *exec = NULL;
 276        const char *output = NULL;
 277        int compression_level = -1;
 278        int verbose = 0;
 279        int i;
 280        int list = 0;
 281        int worktree_attributes = 0;
 282        struct option opts[] = {
 283                OPT_GROUP(""),
 284                OPT_STRING(0, "format", &format, "fmt", "archive format"),
 285                OPT_STRING(0, "prefix", &base, "prefix",
 286                        "prepend prefix to each pathname in the archive"),
 287                OPT_STRING('o', "output", &output, "file",
 288                        "write the archive to this file"),
 289                OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
 290                        "read .gitattributes in working directory"),
 291                OPT__VERBOSE(&verbose),
 292                OPT__COMPR('0', &compression_level, "store only", 0),
 293                OPT__COMPR('1', &compression_level, "compress faster", 1),
 294                OPT__COMPR_HIDDEN('2', &compression_level, 2),
 295                OPT__COMPR_HIDDEN('3', &compression_level, 3),
 296                OPT__COMPR_HIDDEN('4', &compression_level, 4),
 297                OPT__COMPR_HIDDEN('5', &compression_level, 5),
 298                OPT__COMPR_HIDDEN('6', &compression_level, 6),
 299                OPT__COMPR_HIDDEN('7', &compression_level, 7),
 300                OPT__COMPR_HIDDEN('8', &compression_level, 8),
 301                OPT__COMPR('9', &compression_level, "compress better", 9),
 302                OPT_GROUP(""),
 303                OPT_BOOLEAN('l', "list", &list,
 304                        "list supported archive formats"),
 305                OPT_GROUP(""),
 306                OPT_STRING(0, "remote", &remote, "repo",
 307                        "retrieve the archive from remote repository <repo>"),
 308                OPT_STRING(0, "exec", &exec, "cmd",
 309                        "path to the remote git-upload-archive command"),
 310                OPT_END()
 311        };
 312
 313        argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
 314
 315        if (remote)
 316                die("Unexpected option --remote");
 317        if (exec)
 318                die("Option --exec can only be used together with --remote");
 319        if (output)
 320                die("Unexpected option --output");
 321
 322        if (!base)
 323                base = "";
 324
 325        if (list) {
 326                for (i = 0; i < ARRAY_SIZE(archivers); i++)
 327                        printf("%s\n", archivers[i].name);
 328                exit(0);
 329        }
 330
 331        /* We need at least one parameter -- tree-ish */
 332        if (argc < 1)
 333                usage_with_options(archive_usage, opts);
 334        *ar = lookup_archiver(format);
 335        if (!*ar)
 336                die("Unknown archive format '%s'", format);
 337
 338        args->compression_level = Z_DEFAULT_COMPRESSION;
 339        if (compression_level != -1) {
 340                if ((*ar)->flags & USES_ZLIB_COMPRESSION)
 341                        args->compression_level = compression_level;
 342                else {
 343                        die("Argument not supported for format '%s': -%d",
 344                                        format, compression_level);
 345                }
 346        }
 347        args->verbose = verbose;
 348        args->base = base;
 349        args->baselen = strlen(base);
 350        args->worktree_attributes = worktree_attributes;
 351
 352        return argc;
 353}
 354
 355int write_archive(int argc, const char **argv, const char *prefix,
 356                int setup_prefix)
 357{
 358        const struct archiver *ar = NULL;
 359        struct archiver_args args;
 360
 361        argc = parse_archive_args(argc, argv, &ar, &args);
 362        if (setup_prefix && prefix == NULL)
 363                prefix = setup_git_directory();
 364
 365        parse_treeish_arg(argv, &args, prefix);
 366        parse_pathspec_arg(argv + 1, &args);
 367
 368        git_config(git_default_config, NULL);
 369
 370        return ar->write_archive(&args);
 371}