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 (!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
  82 static 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
  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                 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
 147 int 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
 209 static 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
 240 int 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 }