builtin-archive.c

   1 /*
   2  * Copyright (c) 2006 Franck Bui-Huu
   3  * Copyright (c) 2006 Rene Scharfe
   4  */
   5 #include <time.h>
   6 #include "cache.h"
   7 #include "builtin.h"
   8 #include "archive.h"
   9 #include "commit.h"
  10 #include "tree-walk.h"
  11 #include "exec_cmd.h"
  12 #include "pkt-line.h"
  13 #include "sideband.h"
  14
  15 static const char archive_usage[] = \
  16 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
  17
  18 struct archiver archivers[] = {
  19         {
  20                 .name           = "tar",
  21                 .write_archive  = write_tar_archive,
  22         },
  23         {
  24                 .name           = "zip",
  25                 .write_archive  = write_zip_archive,
  26                 .parse_extra    = parse_extra_zip_args,
  27         },
  28 };
  29
  30 static int run_remote_archiver(const char *remote, int argc,
  31                                const char **argv)
  32 {
  33         char *url, buf[LARGE_PACKET_MAX];
  34         int fd[2], i, len, rv;
  35         pid_t pid;
  36         const char *exec = "git-upload-archive";
  37         int exec_at = 0;
  38
  39         for (i = 1; i < argc; i++) {
  40                 const char *arg = argv[i];
  41                 if (!strncmp("--exec=", arg, 7)) {
  42                         if (exec_at)
  43                                 die("multiple --exec specified");
  44                         exec = arg + 7;
  45                         exec_at = i;
  46                         break;
  47                 }
  48         }
  49
  50         url = xstrdup(remote);
  51         pid = git_connect(fd, url, exec);
  52         if (pid < 0)
  53                 return pid;
  54
  55         for (i = 1; i < argc; i++) {
  56                 if (i == exec_at)
  57                         continue;
  58                 packet_write(fd[1], "argument %s\n", argv[i]);
  59         }
  60         packet_flush(fd[1]);
  61
  62         len = packet_read_line(fd[0], buf, sizeof(buf));
  63         if (!len)
  64                 die("git-archive: expected ACK/NAK, got EOF");
  65         if (buf[len-1] == '\n')
  66                 buf[--len] = 0;
  67         if (strcmp(buf, "ACK")) {
  68                 if (len > 5 && !strncmp(buf, "NACK ", 5))
  69                         die("git-archive: NACK %s", buf + 5);
  70                 die("git-archive: protocol error");
  71         }
  72
  73         len = packet_read_line(fd[0], buf, sizeof(buf));
  74         if (len)
  75                 die("git-archive: expected a flush");
  76
  77         /* Now, start reading from fd[0] and spit it out to stdout */
  78         rv = recv_sideband("archive", fd[0], 1, 2, buf, sizeof(buf));
  79         close(fd[0]);
  80         rv |= finish_connect(pid);
  81
  82         return !!rv;
  83 }
  84
  85 static int init_archiver(const char *name, struct archiver *ar)
  86 {
  87         int rv = -1, i;
  88
  89         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
  90                 if (!strcmp(name, archivers[i].name)) {
  91                         memcpy(ar, &archivers[i], sizeof(struct archiver));
  92                         rv = 0;
  93                         break;
  94                 }
  95         }
  96         return rv;
  97 }
  98
  99 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 100 {
 101         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 102 }
 103
 104 void 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                 free(tree);
 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 static const char *default_parse_extra(struct archiver *ar,
 149                                        const char **argv)
 150 {
 151         static char msg[64];
 152
 153         snprintf(msg, sizeof(msg) - 4, "'%s' format does not handle %s",
 154                  ar->name, *argv);
 155
 156         return strcat(msg, "...");
 157 }
 158
 159 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 160 {
 161         const char *extra_argv[MAX_EXTRA_ARGS];
 162         int extra_argc = 0;
 163         const char *format = NULL; /* might want to default to "tar" */
 164         const char *base = "";
 165         int verbose = 0;
 166         int i;
 167
 168         for (i = 1; i < argc; i++) {
 169                 const char *arg = argv[i];
 170
 171                 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 172                         for (i = 0; i < ARRAY_SIZE(archivers); i++)
 173                                 printf("%s\n", archivers[i].name);
 174                         exit(0);
 175                 }
 176                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 177                         verbose = 1;
 178                         continue;
 179                 }
 180                 if (!strncmp(arg, "--format=", 9)) {
 181                         format = arg + 9;
 182                         continue;
 183                 }
 184                 if (!strncmp(arg, "--prefix=", 9)) {
 185                         base = arg + 9;
 186                         continue;
 187                 }
 188                 if (!strcmp(arg, "--")) {
 189                         i++;
 190                         break;
 191                 }
 192                 if (arg[0] == '-') {
 193                         if (extra_argc > MAX_EXTRA_ARGS - 1)
 194                                 die("Too many extra options");
 195                         extra_argv[extra_argc++] = arg;
 196                         continue;
 197                 }
 198                 break;
 199         }
 200
 201         /* We need at least one parameter -- tree-ish */
 202         if (argc - 1 < i)
 203                 usage(archive_usage);
 204         if (!format)
 205                 die("You must specify an archive format");
 206         if (init_archiver(format, ar) < 0)
 207                 die("Unknown archive format '%s'", format);
 208
 209         if (extra_argc) {
 210                 if (!ar->parse_extra)
 211                         die("%s", default_parse_extra(ar, extra_argv));
 212                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 213         }
 214         ar->args.verbose = verbose;
 215         ar->args.base = base;
 216
 217         return i;
 218 }
 219
 220 static const char *extract_remote_arg(int *ac, const char **av)
 221 {
 222         int ix, iy, cnt = *ac;
 223         int no_more_options = 0;
 224         const char *remote = NULL;
 225
 226         for (ix = iy = 1; ix < cnt; ix++) {
 227                 const char *arg = av[ix];
 228                 if (!strcmp(arg, "--"))
 229                         no_more_options = 1;
 230                 if (!no_more_options) {
 231                         if (!strncmp(arg, "--remote=", 9)) {
 232                                 if (remote)
 233                                         die("Multiple --remote specified");
 234                                 remote = arg + 9;
 235                                 continue;
 236                         }
 237                         if (arg[0] != '-')
 238                                 no_more_options = 1;
 239                 }
 240                 if (ix != iy)
 241                         av[iy] = arg;
 242                 iy++;
 243         }
 244         if (remote) {
 245                 av[--cnt] = NULL;
 246                 *ac = cnt;
 247         }
 248         return remote;
 249 }
 250
 251 int cmd_archive(int argc, const char **argv, const char *prefix)
 252 {
 253         struct archiver ar;
 254         int tree_idx;
 255         const char *remote = NULL;
 256
 257         remote = extract_remote_arg(&argc, argv);
 258         if (remote)
 259                 return run_remote_archiver(remote, argc, argv);
 260
 261         setlinebuf(stderr);
 262
 263         memset(&ar, 0, sizeof(ar));
 264         tree_idx = parse_archive_args(argc, argv, &ar);
 265         if (prefix == NULL)
 266                 prefix = setup_git_directory();
 267
 268         argv += tree_idx;
 269         parse_treeish_arg(argv, &ar.args, prefix);
 270         parse_pathspec_arg(argv + 1, &ar.args);
 271
 272         return ar.write_archive(&ar.args);
 273 }