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        rv |= finish_connect(pid);
  78
  79        return !!rv;
  80}
  81
  82static int init_archiver(const char *name, struct archiver *ar)
  83{
  84        int rv = -1, i;
  85
  86        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
  87                if (!strcmp(name, archivers[i].name)) {
  88                        memset(ar, 0, sizeof(*ar));
  89                        ar->name = archivers[i].name;
  90                        ar->write_archive = archivers[i].write_archive;
  91                        ar->parse_extra = archivers[i].parse_extra;
  92                        rv = 0;
  93                        break;
  94                }
  95        }
  96        return rv;
  97}
  98
  99void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 100{
 101        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 102}
 103
 104void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 105                       const char *prefix)
 106{
 107        const char *name = argv[0];
 108        const unsigned char *commit_sha1;
 109        time_t archive_time;
 110        struct tree *tree;
 111        struct commit *commit;
 112        unsigned char sha1[20];
 113
 114        if (get_sha1(name, sha1))
 115                die("Not a valid object name");
 116
 117        commit = lookup_commit_reference_gently(sha1, 1);
 118        if (commit) {
 119                commit_sha1 = commit->object.sha1;
 120                archive_time = commit->date;
 121        } else {
 122                commit_sha1 = NULL;
 123                archive_time = time(NULL);
 124        }
 125
 126        tree = parse_tree_indirect(sha1);
 127        if (tree == NULL)
 128                die("not a tree object");
 129
 130        if (prefix) {
 131                unsigned char tree_sha1[20];
 132                unsigned int mode;
 133                int err;
 134
 135                err = get_tree_entry(tree->object.sha1, prefix,
 136                                     tree_sha1, &mode);
 137                if (err || !S_ISDIR(mode))
 138                        die("current working directory is untracked");
 139
 140                tree = parse_tree_indirect(tree_sha1);
 141        }
 142        ar_args->tree = tree;
 143        ar_args->commit_sha1 = commit_sha1;
 144        ar_args->time = archive_time;
 145}
 146
 147int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 148{
 149        const char *extra_argv[MAX_EXTRA_ARGS];
 150        int extra_argc = 0;
 151        const char *format = NULL; /* might want to default to "tar" */
 152        const char *base = "";
 153        int verbose = 0;
 154        int i;
 155
 156        for (i = 1; i < argc; i++) {
 157                const char *arg = argv[i];
 158
 159                if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 160                        for (i = 0; i < ARRAY_SIZE(archivers); i++)
 161                                printf("%s\n", archivers[i].name);
 162                        exit(0);
 163                }
 164                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 165                        verbose = 1;
 166                        continue;
 167                }
 168                if (!strncmp(arg, "--format=", 9)) {
 169                        format = arg + 9;
 170                        continue;
 171                }
 172                if (!strncmp(arg, "--prefix=", 9)) {
 173                        base = arg + 9;
 174                        continue;
 175                }
 176                if (!strcmp(arg, "--")) {
 177                        i++;
 178                        break;
 179                }
 180                if (arg[0] == '-') {
 181                        if (extra_argc > MAX_EXTRA_ARGS - 1)
 182                                die("Too many extra options");
 183                        extra_argv[extra_argc++] = arg;
 184                        continue;
 185                }
 186                break;
 187        }
 188
 189        /* We need at least one parameter -- tree-ish */
 190        if (argc - 1 < i)
 191                usage(archive_usage);
 192        if (!format)
 193                die("You must specify an archive format");
 194        if (init_archiver(format, ar) < 0)
 195                die("Unknown archive format '%s'", format);
 196
 197        if (extra_argc) {
 198                if (!ar->parse_extra)
 199                        die("'%s' format does not handle %s",
 200                            ar->name, extra_argv[0]);
 201                ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 202        }
 203        ar->args.verbose = verbose;
 204        ar->args.base = base;
 205
 206        return i;
 207}
 208
 209static const char *extract_remote_arg(int *ac, const char **av)
 210{
 211        int ix, iy, cnt = *ac;
 212        int no_more_options = 0;
 213        const char *remote = NULL;
 214
 215        for (ix = iy = 1; ix < cnt; ix++) {
 216                const char *arg = av[ix];
 217                if (!strcmp(arg, "--"))
 218                        no_more_options = 1;
 219                if (!no_more_options) {
 220                        if (!strncmp(arg, "--remote=", 9)) {
 221                                if (remote)
 222                                        die("Multiple --remote specified");
 223                                remote = arg + 9;
 224                                continue;
 225                        }
 226                        if (arg[0] != '-')
 227                                no_more_options = 1;
 228                }
 229                if (ix != iy)
 230                        av[iy] = arg;
 231                iy++;
 232        }
 233        if (remote) {
 234                av[--cnt] = NULL;
 235                *ac = cnt;
 236        }
 237        return remote;
 238}
 239
 240int cmd_archive(int argc, const char **argv, const char *prefix)
 241{
 242        struct archiver ar;
 243        int tree_idx;
 244        const char *remote = NULL;
 245
 246        remote = extract_remote_arg(&argc, argv);
 247        if (remote)
 248                return run_remote_archiver(remote, argc, argv);
 249
 250        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 251
 252        memset(&ar, 0, sizeof(ar));
 253        tree_idx = parse_archive_args(argc, argv, &ar);
 254        if (prefix == NULL)
 255                prefix = setup_git_directory();
 256
 257        argv += tree_idx;
 258        parse_treeish_arg(argv, &ar.args, prefix);
 259        parse_pathspec_arg(argv + 1, &ar.args);
 260
 261        return ar.write_archive(&ar.args);
 262}