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