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
  14 static const char archive_usage[] = \
  15 "git-archive --format=<fmt> [--prefix=<prefix>/] [<extra>] <tree-ish> [path...]";
  16
  17 struct archiver archivers[] = {
  18         {
  19                 .name           = "tar",
  20                 .write_archive  = write_tar_archive,
  21         },
  22         {
  23                 .name           = "zip",
  24                 .write_archive  = write_zip_archive,
  25                 .parse_extra    = parse_extra_zip_args,
  26         },
  27 };
  28
  29 static int run_remote_archiver(const char *remote, int argc,
  30                                const char **argv)
  31 {
  32         char *url, buf[1024];
  33         int fd[2], i, len, rv;
  34         pid_t pid;
  35
  36         sprintf(buf, "git-upload-archive");
  37
  38         url = xstrdup(remote);
  39         pid = git_connect(fd, url, buf);
  40         if (pid < 0)
  41                 return pid;
  42
  43         for (i = 1; i < argc; i++)
  44                 packet_write(fd[1], "argument %s\n", argv[i]);
  45         packet_flush(fd[1]);
  46
  47         len = packet_read_line(fd[0], buf, sizeof(buf));
  48         if (!len)
  49                 die("git-archive: expected ACK/NAK, got EOF");
  50         if (buf[len-1] == '\n')
  51                 buf[--len] = 0;
  52         if (strcmp(buf, "ACK")) {
  53                 if (len > 5 && !strncmp(buf, "NACK ", 5))
  54                         die("git-archive: NACK %s", buf + 5);
  55                 die("git-archive: protocol error");
  56         }
  57
  58         len = packet_read_line(fd[0], buf, sizeof(buf));
  59         if (len)
  60                 die("git-archive: expected a flush");
  61
  62         /* Now, start reading from fd[0] and spit it out to stdout */
  63         rv = copy_fd(fd[0], 1);
  64
  65         close(fd[0]);
  66         rv |= finish_connect(pid);
  67
  68         return !!rv;
  69 }
  70
  71 static int init_archiver(const char *name, struct archiver *ar)
  72 {
  73         int rv = -1, i;
  74
  75         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
  76                 if (!strcmp(name, archivers[i].name)) {
  77                         memcpy(ar, &archivers[i], sizeof(struct archiver));
  78                         rv = 0;
  79                         break;
  80                 }
  81         }
  82         return rv;
  83 }
  84
  85 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
  86 {
  87         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
  88 }
  89
  90 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
  91                        const char *prefix)
  92 {
  93         const char *name = argv[0];
  94         const unsigned char *commit_sha1;
  95         time_t archive_time;
  96         struct tree *tree;
  97         struct commit *commit;
  98         unsigned char sha1[20];
  99
 100         if (get_sha1(name, sha1))
 101                 die("Not a valid object name");
 102
 103         commit = lookup_commit_reference_gently(sha1, 1);
 104         if (commit) {
 105                 commit_sha1 = commit->object.sha1;
 106                 archive_time = commit->date;
 107         } else {
 108                 commit_sha1 = NULL;
 109                 archive_time = time(NULL);
 110         }
 111
 112         tree = parse_tree_indirect(sha1);
 113         if (tree == NULL)
 114                 die("not a tree object");
 115
 116         if (prefix) {
 117                 unsigned char tree_sha1[20];
 118                 unsigned int mode;
 119                 int err;
 120
 121                 err = get_tree_entry(tree->object.sha1, prefix,
 122                                      tree_sha1, &mode);
 123                 if (err || !S_ISDIR(mode))
 124                         die("current working directory is untracked");
 125
 126                 free(tree);
 127                 tree = parse_tree_indirect(tree_sha1);
 128         }
 129         ar_args->tree = tree;
 130         ar_args->commit_sha1 = commit_sha1;
 131         ar_args->time = archive_time;
 132 }
 133
 134 static const char *default_parse_extra(struct archiver *ar,
 135                                        const char **argv)
 136 {
 137         static char msg[64];
 138
 139         snprintf(msg, sizeof(msg) - 4, "'%s' format does not handle %s",
 140                  ar->name, *argv);
 141
 142         return strcat(msg, "...");
 143 }
 144
 145 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 146 {
 147         const char *extra_argv[MAX_EXTRA_ARGS];
 148         int extra_argc = 0;
 149         const char *format = NULL; /* might want to default to "tar" */
 150         const char *base = "";
 151         int i;
 152
 153         for (i = 1; i < argc; i++) {
 154                 const char *arg = argv[i];
 155
 156                 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 157                         for (i = 0; i < ARRAY_SIZE(archivers); i++)
 158                                 printf("%s\n", archivers[i].name);
 159                         exit(0);
 160                 }
 161                 if (!strncmp(arg, "--format=", 9)) {
 162                         format = arg + 9;
 163                         continue;
 164                 }
 165                 if (!strncmp(arg, "--prefix=", 9)) {
 166                         base = arg + 9;
 167                         continue;
 168                 }
 169                 if (!strcmp(arg, "--")) {
 170                         i++;
 171                         break;
 172                 }
 173                 if (arg[0] == '-') {
 174                         if (extra_argc > MAX_EXTRA_ARGS - 1)
 175                                 die("Too many extra options");
 176                         extra_argv[extra_argc++] = arg;
 177                         continue;
 178                 }
 179                 break;
 180         }
 181
 182         /* We need at least one parameter -- tree-ish */
 183         if (argc - 1 < i)
 184                 usage(archive_usage);
 185         if (!format)
 186                 die("You must specify an archive format");
 187         if (init_archiver(format, ar) < 0)
 188                 die("Unknown archive format '%s'", format);
 189
 190         if (extra_argc) {
 191                 if (!ar->parse_extra)
 192                         die("%s", default_parse_extra(ar, extra_argv));
 193                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 194         }
 195         ar->args.base = base;
 196
 197         return i;
 198 }
 199
 200 static const char *remote_request(int *ac, const char **av)
 201 {
 202         int ix, iy, cnt = *ac;
 203         int no_more_options = 0;
 204         const char *remote = NULL;
 205
 206         for (ix = iy = 1; ix < cnt; ix++) {
 207                 const char *arg = av[ix];
 208                 if (!strcmp(arg, "--"))
 209                         no_more_options = 1;
 210                 if (!no_more_options) {
 211                         if (!strncmp(arg, "--remote=", 9)) {
 212                                 if (remote)
 213                                         die("Multiple --remote specified");
 214                                 remote = arg + 9;
 215                                 continue;
 216                         }
 217                         if (arg[0] != '-')
 218                                 no_more_options = 1;
 219                 }
 220                 if (ix != iy)
 221                         av[iy] = arg;
 222                 iy++;
 223         }
 224         if (remote) {
 225                 av[--cnt] = NULL;
 226                 *ac = cnt;
 227         }
 228         return remote;
 229 }
 230
 231 int cmd_archive(int argc, const char **argv, const char *prefix)
 232 {
 233         struct archiver ar;
 234         int tree_idx;
 235         const char *remote = NULL;
 236
 237         remote = remote_request(&argc, argv);
 238         if (remote)
 239                 return run_remote_archiver(remote, argc, argv);
 240
 241         memset(&ar, 0, sizeof(ar));
 242         tree_idx = parse_archive_args(argc, argv, &ar);
 243         if (prefix == NULL)
 244                 prefix = setup_git_directory();
 245
 246         argv += tree_idx;
 247         parse_treeish_arg(argv, &ar.args, prefix);
 248         parse_pathspec_arg(argv + 1, &ar.args);
 249
 250         return ar.write_archive(&ar.args);
 251 }