git/builtin-archive.c

   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
  14 static const char archive_usage[] = \
  15 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
  16
  17 static 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
  27 static 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 (!prefixcmp(arg, "--exec=")) {
  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, 0);
  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 && !prefixcmp(buf, "NACK "))
  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
  83 static 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
 100 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 101 {
 102         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 103 }
 104
 105 void 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
 148 int 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 = "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 (!prefixcmp(arg, "--format=")) {
 170                         format = arg + 9;
 171                         continue;
 172                 }
 173                 if (!prefixcmp(arg, "--prefix=")) {
 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 (init_archiver(format, ar) < 0)
 194                 die("Unknown archive format '%s'", format);
 195
 196         if (extra_argc) {
 197                 if (!ar->parse_extra)
 198                         die("'%s' format does not handle %s",
 199                             ar->name, extra_argv[0]);
 200                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 201         }
 202         ar->args.verbose = verbose;
 203         ar->args.base = base;
 204
 205         return i;
 206 }
 207
 208 static const char *extract_remote_arg(int *ac, const char **av)
 209 {
 210         int ix, iy, cnt = *ac;
 211         int no_more_options = 0;
 212         const char *remote = NULL;
 213
 214         for (ix = iy = 1; ix < cnt; ix++) {
 215                 const char *arg = av[ix];
 216                 if (!strcmp(arg, "--"))
 217                         no_more_options = 1;
 218                 if (!no_more_options) {
 219                         if (!prefixcmp(arg, "--remote=")) {
 220                                 if (remote)
 221                                         die("Multiple --remote specified");
 222                                 remote = arg + 9;
 223                                 continue;
 224                         }
 225                         if (arg[0] != '-')
 226                                 no_more_options = 1;
 227                 }
 228                 if (ix != iy)
 229                         av[iy] = arg;
 230                 iy++;
 231         }
 232         if (remote) {
 233                 av[--cnt] = NULL;
 234                 *ac = cnt;
 235         }
 236         return remote;
 237 }
 238
 239 int cmd_archive(int argc, const char **argv, const char *prefix)
 240 {
 241         struct archiver ar;
 242         int tree_idx;
 243         const char *remote = NULL;
 244
 245         remote = extract_remote_arg(&argc, argv);
 246         if (remote)
 247                 return run_remote_archiver(remote, argc, argv);
 248
 249         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 250
 251         memset(&ar, 0, sizeof(ar));
 252         tree_idx = parse_archive_args(argc, argv, &ar);
 253         if (prefix == NULL)
 254                 prefix = setup_git_directory();
 255
 256         argv += tree_idx;
 257         parse_treeish_arg(argv, &ar.args, prefix);
 258         parse_pathspec_arg(argv + 1, &ar.args);
 259
 260         return ar.write_archive(&ar.args);
 261 }