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