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 static struct archiver_desc
  19 {
  20         const char *name;
  21         write_archive_fn_t write_archive;
  22         parse_extra_args_fn_t parse_extra;
  23 } archivers[] = {
  24         { "tar", write_tar_archive, NULL },
  25         { "zip", write_zip_archive, parse_extra_zip_args },
  26 };
  27
  28 static int run_remote_archiver(const char *remote, int argc,
  29                                const char **argv)
  30 {
  31         char *url, buf[LARGE_PACKET_MAX];
  32         int fd[2], i, len, rv;
  33         pid_t pid;
  34         const char *exec = "git-upload-archive";
  35         int exec_at = 0;
  36
  37         for (i = 1; i < argc; i++) {
  38                 const char *arg = argv[i];
  39                 if (!strncmp("--exec=", arg, 7)) {
  40                         if (exec_at)
  41                                 die("multiple --exec specified");
  42                         exec = arg + 7;
  43                         exec_at = i;
  44                         break;
  45                 }
  46         }
  47
  48         url = xstrdup(remote);
  49         pid = git_connect(fd, url, exec);
  50         if (pid < 0)
  51                 return pid;
  52
  53         for (i = 1; i < argc; i++) {
  54                 if (i == exec_at)
  55                         continue;
  56                 packet_write(fd[1], "argument %s\n", argv[i]);
  57         }
  58         packet_flush(fd[1]);
  59
  60         len = packet_read_line(fd[0], buf, sizeof(buf));
  61         if (!len)
  62                 die("git-archive: expected ACK/NAK, got EOF");
  63         if (buf[len-1] == '\n')
  64                 buf[--len] = 0;
  65         if (strcmp(buf, "ACK")) {
  66                 if (len > 5 && !strncmp(buf, "NACK ", 5))
  67                         die("git-archive: NACK %s", buf + 5);
  68                 die("git-archive: protocol error");
  69         }
  70
  71         len = packet_read_line(fd[0], buf, sizeof(buf));
  72         if (len)
  73                 die("git-archive: expected a flush");
  74
  75         /* Now, start reading from fd[0] and spit it out to stdout */
  76         rv = recv_sideband("archive", fd[0], 1, 2);
  77         close(fd[0]);
  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                 free(tree);
 142                 tree = parse_tree_indirect(tree_sha1);
 143         }
 144         ar_args->tree = tree;
 145         ar_args->commit_sha1 = commit_sha1;
 146         ar_args->time = archive_time;
 147 }
 148
 149 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 150 {
 151         const char *extra_argv[MAX_EXTRA_ARGS];
 152         int extra_argc = 0;
 153         const char *format = NULL; /* might want to default to "tar" */
 154         const char *base = "";
 155         int verbose = 0;
 156         int i;
 157
 158         for (i = 1; i < argc; i++) {
 159                 const char *arg = argv[i];
 160
 161                 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 162                         for (i = 0; i < ARRAY_SIZE(archivers); i++)
 163                                 printf("%s\n", archivers[i].name);
 164                         exit(0);
 165                 }
 166                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 167                         verbose = 1;
 168                         continue;
 169                 }
 170                 if (!strncmp(arg, "--format=", 9)) {
 171                         format = arg + 9;
 172                         continue;
 173                 }
 174                 if (!strncmp(arg, "--prefix=", 9)) {
 175                         base = arg + 9;
 176                         continue;
 177                 }
 178                 if (!strcmp(arg, "--")) {
 179                         i++;
 180                         break;
 181                 }
 182                 if (arg[0] == '-') {
 183                         if (extra_argc > MAX_EXTRA_ARGS - 1)
 184                                 die("Too many extra options");
 185                         extra_argv[extra_argc++] = arg;
 186                         continue;
 187                 }
 188                 break;
 189         }
 190
 191         /* We need at least one parameter -- tree-ish */
 192         if (argc - 1 < i)
 193                 usage(archive_usage);
 194         if (!format)
 195                 die("You must specify an archive format");
 196         if (init_archiver(format, ar) < 0)
 197                 die("Unknown archive format '%s'", format);
 198
 199         if (extra_argc) {
 200                 if (!ar->parse_extra)
 201                         die("'%s' format does not handle %s",
 202                             ar->name, extra_argv[0]);
 203                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 204         }
 205         ar->args.verbose = verbose;
 206         ar->args.base = base;
 207
 208         return i;
 209 }
 210
 211 static const char *extract_remote_arg(int *ac, const char **av)
 212 {
 213         int ix, iy, cnt = *ac;
 214         int no_more_options = 0;
 215         const char *remote = NULL;
 216
 217         for (ix = iy = 1; ix < cnt; ix++) {
 218                 const char *arg = av[ix];
 219                 if (!strcmp(arg, "--"))
 220                         no_more_options = 1;
 221                 if (!no_more_options) {
 222                         if (!strncmp(arg, "--remote=", 9)) {
 223                                 if (remote)
 224                                         die("Multiple --remote specified");
 225                                 remote = arg + 9;
 226                                 continue;
 227                         }
 228                         if (arg[0] != '-')
 229                                 no_more_options = 1;
 230                 }
 231                 if (ix != iy)
 232                         av[iy] = arg;
 233                 iy++;
 234         }
 235         if (remote) {
 236                 av[--cnt] = NULL;
 237                 *ac = cnt;
 238         }
 239         return remote;
 240 }
 241
 242 int cmd_archive(int argc, const char **argv, const char *prefix)
 243 {
 244         struct archiver ar;
 245         int tree_idx;
 246         const char *remote = NULL;
 247
 248         remote = extract_remote_arg(&argc, argv);
 249         if (remote)
 250                 return run_remote_archiver(remote, argc, argv);
 251
 252         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 253
 254         memset(&ar, 0, sizeof(ar));
 255         tree_idx = parse_archive_args(argc, argv, &ar);
 256         if (prefix == NULL)
 257                 prefix = setup_git_directory();
 258
 259         argv += tree_idx;
 260         parse_treeish_arg(argv, &ar.args, prefix);
 261         parse_pathspec_arg(argv + 1, &ar.args);
 262
 263         return ar.write_archive(&ar.args);
 264 }