Andrew's git - gitweb.git/blob

6fa424d3869c051fe7f5907f15e83bb5367a8ac4
   1/*
   2 * Copyright (c) 2006 Franck Bui-Huu
   3 * Copyright (c) 2006 Rene Scharfe
   4 */
   5#include "cache.h"
   6#include "builtin.h"
   7#include "archive.h"
   8#include "commit.h"
   9#include "tree-walk.h"
  10#include "exec_cmd.h"
  11#include "pkt-line.h"
  12#include "sideband.h"
  13#include "attr.h"
  14
  15static const char archive_usage[] = \
  16"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
  17
  18static struct archiver_desc
  19{
  20        const char *name;
  21        write_archive_fn_t write_archive;
  22        parse_extra_args_fn_t parse_extra;
  23} archivers[] = {
  24        { "tar", write_tar_archive, NULL },
  25        { "zip", write_zip_archive, parse_extra_zip_args },
  26};
  27
  28static int run_remote_archiver(const char *remote, int argc,
  29                               const char **argv)
  30{
  31        char *url, buf[LARGE_PACKET_MAX];
  32        int fd[2], i, len, rv;
  33        pid_t pid;
  34        const char *exec = "git-upload-archive";
  35        int exec_at = 0;
  36
  37        for (i = 1; i < argc; i++) {
  38                const char *arg = argv[i];
  39                if (!prefixcmp(arg, "--exec=")) {
  40                        if (exec_at)
  41                                die("multiple --exec specified");
  42                        exec = arg + 7;
  43                        exec_at = i;
  44                        break;
  45                }
  46        }
  47
  48        url = xstrdup(remote);
  49        pid = git_connect(fd, url, exec, 0);
  50        if (pid < 0)
  51                return pid;
  52
  53        for (i = 1; i < argc; i++) {
  54                if (i == exec_at)
  55                        continue;
  56                packet_write(fd[1], "argument %s\n", argv[i]);
  57        }
  58        packet_flush(fd[1]);
  59
  60        len = packet_read_line(fd[0], buf, sizeof(buf));
  61        if (!len)
  62                die("git-archive: expected ACK/NAK, got EOF");
  63        if (buf[len-1] == '\n')
  64                buf[--len] = 0;
  65        if (strcmp(buf, "ACK")) {
  66                if (len > 5 && !prefixcmp(buf, "NACK "))
  67                        die("git-archive: NACK %s", buf + 5);
  68                die("git-archive: protocol error");
  69        }
  70
  71        len = packet_read_line(fd[0], buf, sizeof(buf));
  72        if (len)
  73                die("git-archive: expected a flush");
  74
  75        /* Now, start reading from fd[0] and spit it out to stdout */
  76        rv = recv_sideband("archive", fd[0], 1, 2);
  77        close(fd[0]);
  78        close(fd[1]);
  79        rv |= finish_connect(pid);
  80
  81        return !!rv;
  82}
  83
  84static void *format_subst(const struct commit *commit, const char *format,
  85                          unsigned long *sizep)
  86{
  87        unsigned long len = *sizep;
  88        const char *a = format;
  89        struct strbuf result;
  90        struct strbuf fmt;
  91
  92        strbuf_init(&result, 0);
  93        strbuf_init(&fmt, 0);
  94
  95        for (;;) {
  96                const char *b, *c;
  97
  98                b = memmem(a, len, "$Format:", 8);
  99                if (!b || a + len < b + 9)
 100                        break;
 101                c = memchr(b + 8, '$', len - 8);
 102                if (!c)
 103                        break;
 104
 105                strbuf_reset(&fmt);
 106                strbuf_add(&fmt, b + 8, c - b - 8);
 107
 108                strbuf_add(&result, a, b - a);
 109                format_commit_message(commit, fmt.buf, &result);
 110                len -= c + 1 - a;
 111                a = c + 1;
 112        }
 113
 114        strbuf_add(&result, a, len);
 115
 116        *sizep = result.len;
 117
 118        strbuf_release(&fmt);
 119        return strbuf_detach(&result);
 120}
 121
 122static void *convert_to_archive(const char *path,
 123                                const void *src, unsigned long *sizep,
 124                                const struct commit *commit)
 125{
 126        static struct git_attr *attr_export_subst;
 127        struct git_attr_check check[1];
 128
 129        if (!commit)
 130                return NULL;
 131
 132        if (!attr_export_subst)
 133                attr_export_subst = git_attr("export-subst", 12);
 134
 135        check[0].attr = attr_export_subst;
 136        if (git_checkattr(path, ARRAY_SIZE(check), check))
 137                return NULL;
 138        if (!ATTR_TRUE(check[0].value))
 139                return NULL;
 140
 141        return format_subst(commit, src, sizep);
 142}
 143
 144void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 145                           unsigned int mode, enum object_type *type,
 146                           unsigned long *size,
 147                           const struct commit *commit)
 148{
 149        void *buffer, *converted;
 150
 151        buffer = read_sha1_file(sha1, type, size);
 152        if (buffer && S_ISREG(mode)) {
 153                converted = convert_to_working_tree(path, buffer, size);
 154                if (converted) {
 155                        free(buffer);
 156                        buffer = converted;
 157                }
 158
 159                converted = convert_to_archive(path, buffer, size, commit);
 160                if (converted) {
 161                        free(buffer);
 162                        buffer = converted;
 163                }
 164        }
 165
 166        return buffer;
 167}
 168
 169static int init_archiver(const char *name, struct archiver *ar)
 170{
 171        int rv = -1, i;
 172
 173        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 174                if (!strcmp(name, archivers[i].name)) {
 175                        memset(ar, 0, sizeof(*ar));
 176                        ar->name = archivers[i].name;
 177                        ar->write_archive = archivers[i].write_archive;
 178                        ar->parse_extra = archivers[i].parse_extra;
 179                        rv = 0;
 180                        break;
 181                }
 182        }
 183        return rv;
 184}
 185
 186void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 187{
 188        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 189}
 190
 191void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 192                       const char *prefix)
 193{
 194        const char *name = argv[0];
 195        const unsigned char *commit_sha1;
 196        time_t archive_time;
 197        struct tree *tree;
 198        const struct commit *commit;
 199        unsigned char sha1[20];
 200
 201        if (get_sha1(name, sha1))
 202                die("Not a valid object name");
 203
 204        commit = lookup_commit_reference_gently(sha1, 1);
 205        if (commit) {
 206                commit_sha1 = commit->object.sha1;
 207                archive_time = commit->date;
 208        } else {
 209                commit_sha1 = NULL;
 210                archive_time = time(NULL);
 211        }
 212
 213        tree = parse_tree_indirect(sha1);
 214        if (tree == NULL)
 215                die("not a tree object");
 216
 217        if (prefix) {
 218                unsigned char tree_sha1[20];
 219                unsigned int mode;
 220                int err;
 221
 222                err = get_tree_entry(tree->object.sha1, prefix,
 223                                     tree_sha1, &mode);
 224                if (err || !S_ISDIR(mode))
 225                        die("current working directory is untracked");
 226
 227                tree = parse_tree_indirect(tree_sha1);
 228        }
 229        ar_args->tree = tree;
 230        ar_args->commit_sha1 = commit_sha1;
 231        ar_args->commit = commit;
 232        ar_args->time = archive_time;
 233}
 234
 235int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 236{
 237        const char *extra_argv[MAX_EXTRA_ARGS];
 238        int extra_argc = 0;
 239        const char *format = "tar";
 240        const char *base = "";
 241        int verbose = 0;
 242        int i;
 243
 244        for (i = 1; i < argc; i++) {
 245                const char *arg = argv[i];
 246
 247                if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 248                        for (i = 0; i < ARRAY_SIZE(archivers); i++)
 249                                printf("%s\n", archivers[i].name);
 250                        exit(0);
 251                }
 252                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 253                        verbose = 1;
 254                        continue;
 255                }
 256                if (!prefixcmp(arg, "--format=")) {
 257                        format = arg + 9;
 258                        continue;
 259                }
 260                if (!prefixcmp(arg, "--prefix=")) {
 261                        base = arg + 9;
 262                        continue;
 263                }
 264                if (!strcmp(arg, "--")) {
 265                        i++;
 266                        break;
 267                }
 268                if (arg[0] == '-') {
 269                        if (extra_argc > MAX_EXTRA_ARGS - 1)
 270                                die("Too many extra options");
 271                        extra_argv[extra_argc++] = arg;
 272                        continue;
 273                }
 274                break;
 275        }
 276
 277        /* We need at least one parameter -- tree-ish */
 278        if (argc - 1 < i)
 279                usage(archive_usage);
 280        if (init_archiver(format, ar) < 0)
 281                die("Unknown archive format '%s'", format);
 282
 283        if (extra_argc) {
 284                if (!ar->parse_extra)
 285                        die("'%s' format does not handle %s",
 286                            ar->name, extra_argv[0]);
 287                ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 288        }
 289        ar->args.verbose = verbose;
 290        ar->args.base = base;
 291
 292        return i;
 293}
 294
 295static const char *extract_remote_arg(int *ac, const char **av)
 296{
 297        int ix, iy, cnt = *ac;
 298        int no_more_options = 0;
 299        const char *remote = NULL;
 300
 301        for (ix = iy = 1; ix < cnt; ix++) {
 302                const char *arg = av[ix];
 303                if (!strcmp(arg, "--"))
 304                        no_more_options = 1;
 305                if (!no_more_options) {
 306                        if (!prefixcmp(arg, "--remote=")) {
 307                                if (remote)
 308                                        die("Multiple --remote specified");
 309                                remote = arg + 9;
 310                                continue;
 311                        }
 312                        if (arg[0] != '-')
 313                                no_more_options = 1;
 314                }
 315                if (ix != iy)
 316                        av[iy] = arg;
 317                iy++;
 318        }
 319        if (remote) {
 320                av[--cnt] = NULL;
 321                *ac = cnt;
 322        }
 323        return remote;
 324}
 325
 326int cmd_archive(int argc, const char **argv, const char *prefix)
 327{
 328        struct archiver ar;
 329        int tree_idx;
 330        const char *remote = NULL;
 331
 332        remote = extract_remote_arg(&argc, argv);
 333        if (remote)
 334                return run_remote_archiver(remote, argc, argv);
 335
 336        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 337
 338        memset(&ar, 0, sizeof(ar));
 339        tree_idx = parse_archive_args(argc, argv, &ar);
 340        if (prefix == NULL)
 341                prefix = setup_git_directory();
 342
 343        argv += tree_idx;
 344        parse_treeish_arg(argv, &ar.args, prefix);
 345        parse_pathspec_arg(argv + 1, &ar.args);
 346
 347        return ar.write_archive(&ar.args);
 348}