Andrew's git - gitweb.git/blob

   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
  14static const char archive_usage[] = \
  15"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
  16
  17static struct archiver_desc
  18{
  19        const char *name;
  20        write_archive_fn_t write_archive;
  21        parse_extra_args_fn_t parse_extra;
  22} archivers[] = {
  23        { "tar", write_tar_archive, NULL },
  24        { "zip", write_zip_archive, parse_extra_zip_args },
  25};
  26
  27static int run_remote_archiver(const char *remote, int argc,
  28                               const char **argv)
  29{
  30        char *url, buf[LARGE_PACKET_MAX];
  31        int fd[2], i, len, rv;
  32        pid_t pid;
  33        const char *exec = "git-upload-archive";
  34        int exec_at = 0;
  35
  36        for (i = 1; i < argc; i++) {
  37                const char *arg = argv[i];
  38                if (!strncmp("--exec=", arg, 7)) {
  39                        if (exec_at)
  40                                die("multiple --exec specified");
  41                        exec = arg + 7;
  42                        exec_at = i;
  43                        break;
  44                }
  45        }
  46
  47        url = xstrdup(remote);
  48        pid = git_connect(fd, url, exec);
  49        if (pid < 0)
  50                return pid;
  51
  52        for (i = 1; i < argc; i++) {
  53                if (i == exec_at)
  54                        continue;
  55                packet_write(fd[1], "argument %s\n", argv[i]);
  56        }
  57        packet_flush(fd[1]);
  58
  59        len = packet_read_line(fd[0], buf, sizeof(buf));
  60        if (!len)
  61                die("git-archive: expected ACK/NAK, got EOF");
  62        if (buf[len-1] == '\n')
  63                buf[--len] = 0;
  64        if (strcmp(buf, "ACK")) {
  65                if (len > 5 && !strncmp(buf, "NACK ", 5))
  66                        die("git-archive: NACK %s", buf + 5);
  67                die("git-archive: protocol error");
  68        }
  69
  70        len = packet_read_line(fd[0], buf, sizeof(buf));
  71        if (len)
  72                die("git-archive: expected a flush");
  73
  74        /* Now, start reading from fd[0] and spit it out to stdout */
  75        rv = recv_sideband("archive", fd[0], 1, 2);
  76        close(fd[0]);
  77        close(fd[1]);
  78        rv |= finish_connect(pid);
  79
  80        return !!rv;
  81}
  82
  83static int init_archiver(const char *name, struct archiver *ar)
  84{
  85        int rv = -1, i;
  86
  87        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
  88                if (!strcmp(name, archivers[i].name)) {
  89                        memset(ar, 0, sizeof(*ar));
  90                        ar->name = archivers[i].name;
  91                        ar->write_archive = archivers[i].write_archive;
  92                        ar->parse_extra = archivers[i].parse_extra;
  93                        rv = 0;
  94                        break;
  95                }
  96        }
  97        return rv;
  98}
  99
 100void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 101{
 102        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 103}
 104
 105void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 106                       const char *prefix)
 107{
 108        const char *name = argv[0];
 109        const unsigned char *commit_sha1;
 110        time_t archive_time;
 111        struct tree *tree;
 112        struct commit *commit;
 113        unsigned char sha1[20];
 114
 115        if (get_sha1(name, sha1))
 116                die("Not a valid object name");
 117
 118        commit = lookup_commit_reference_gently(sha1, 1);
 119        if (commit) {
 120                commit_sha1 = commit->object.sha1;
 121                archive_time = commit->date;
 122        } else {
 123                commit_sha1 = NULL;
 124                archive_time = time(NULL);
 125        }
 126
 127        tree = parse_tree_indirect(sha1);
 128        if (tree == NULL)
 129                die("not a tree object");
 130
 131        if (prefix) {
 132                unsigned char tree_sha1[20];
 133                unsigned int mode;
 134                int err;
 135
 136                err = get_tree_entry(tree->object.sha1, prefix,
 137                                     tree_sha1, &mode);
 138                if (err || !S_ISDIR(mode))
 139                        die("current working directory is untracked");
 140
 141                tree = parse_tree_indirect(tree_sha1);
 142        }
 143        ar_args->tree = tree;
 144        ar_args->commit_sha1 = commit_sha1;
 145        ar_args->time = archive_time;
 146}
 147
 148int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 149{
 150        const char *extra_argv[MAX_EXTRA_ARGS];
 151        int extra_argc = 0;
 152        const char *format = NULL; /* might want to default to "tar" */
 153        const char *base = "";
 154        int verbose = 0;
 155        int i;
 156
 157        for (i = 1; i < argc; i++) {
 158                const char *arg = argv[i];
 159
 160                if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 161                        for (i = 0; i < ARRAY_SIZE(archivers); i++)
 162                                printf("%s\n", archivers[i].name);
 163                        exit(0);
 164                }
 165                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 166                        verbose = 1;
 167                        continue;
 168                }
 169                if (!strncmp(arg, "--format=", 9)) {
 170                        format = arg + 9;
 171                        continue;
 172                }
 173                if (!strncmp(arg, "--prefix=", 9)) {
 174                        base = arg + 9;
 175                        continue;
 176                }
 177                if (!strcmp(arg, "--")) {
 178                        i++;
 179                        break;
 180                }
 181                if (arg[0] == '-') {
 182                        if (extra_argc > MAX_EXTRA_ARGS - 1)
 183                                die("Too many extra options");
 184                        extra_argv[extra_argc++] = arg;
 185                        continue;
 186                }
 187                break;
 188        }
 189
 190        /* We need at least one parameter -- tree-ish */
 191        if (argc - 1 < i)
 192                usage(archive_usage);
 193        if (!format)
 194                die("You must specify an archive format");
 195        if (init_archiver(format, ar) < 0)
 196                die("Unknown archive format '%s'", format);
 197
 198        if (extra_argc) {
 199                if (!ar->parse_extra)
 200                        die("'%s' format does not handle %s",
 201                            ar->name, extra_argv[0]);
 202                ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 203        }
 204        ar->args.verbose = verbose;
 205        ar->args.base = base;
 206
 207        return i;
 208}
 209
 210static const char *extract_remote_arg(int *ac, const char **av)
 211{
 212        int ix, iy, cnt = *ac;
 213        int no_more_options = 0;
 214        const char *remote = NULL;
 215
 216        for (ix = iy = 1; ix < cnt; ix++) {
 217                const char *arg = av[ix];
 218                if (!strcmp(arg, "--"))
 219                        no_more_options = 1;
 220                if (!no_more_options) {
 221                        if (!strncmp(arg, "--remote=", 9)) {
 222                                if (remote)
 223                                        die("Multiple --remote specified");
 224                                remote = arg + 9;
 225                                continue;
 226                        }
 227                        if (arg[0] != '-')
 228                                no_more_options = 1;
 229                }
 230                if (ix != iy)
 231                        av[iy] = arg;
 232                iy++;
 233        }
 234        if (remote) {
 235                av[--cnt] = NULL;
 236                *ac = cnt;
 237        }
 238        return remote;
 239}
 240
 241int cmd_archive(int argc, const char **argv, const char *prefix)
 242{
 243        struct archiver ar;
 244        int tree_idx;
 245        const char *remote = NULL;
 246
 247        remote = extract_remote_arg(&argc, argv);
 248        if (remote)
 249                return run_remote_archiver(remote, argc, argv);
 250
 251        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 252
 253        memset(&ar, 0, sizeof(ar));
 254        tree_idx = parse_archive_args(argc, argv, &ar);
 255        if (prefix == NULL)
 256                prefix = setup_git_directory();
 257
 258        argv += tree_idx;
 259        parse_treeish_arg(argv, &ar.args, prefix);
 260        parse_pathspec_arg(argv + 1, &ar.args);
 261
 262        return ar.write_archive(&ar.args);
 263}