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