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 #include "attr.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 (!prefixcmp(arg, "--exec=")) {
  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, 0);
  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 && !prefixcmp(buf, "NACK "))
  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         close(fd[1]);
  79         rv |= finish_connect(pid);
  80
  81         return !!rv;
  82 }
  83
  84 static void *convert_to_archive(const char *path,
  85                                 const void *src, unsigned long *sizep,
  86                                 const struct commit *commit)
  87 {
  88         static struct git_attr *attr_specfile;
  89         struct git_attr_check check[1];
  90         char *interpolated = NULL;
  91         unsigned long allocated = 0;
  92
  93         if (!commit)
  94                 return NULL;
  95
  96         if (!attr_specfile)
  97                 attr_specfile = git_attr("specfile", 8);
  98
  99         check[0].attr = attr_specfile;
 100         if (git_checkattr(path, ARRAY_SIZE(check), check))
 101                 return NULL;
 102         if (!ATTR_TRUE(check[0].value))
 103                 return NULL;
 104
 105         *sizep = format_commit_message(commit, src, &interpolated, &allocated);
 106
 107         return interpolated;
 108 }
 109
 110 void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 111                            unsigned int mode, enum object_type *type,
 112                            unsigned long *size,
 113                            const struct commit *commit)
 114 {
 115         void *buffer, *converted;
 116
 117         buffer = read_sha1_file(sha1, type, size);
 118         if (buffer && S_ISREG(mode)) {
 119                 converted = convert_to_working_tree(path, buffer, size);
 120                 if (converted) {
 121                         free(buffer);
 122                         buffer = converted;
 123                 }
 124
 125                 converted = convert_to_archive(path, buffer, size, commit);
 126                 if (converted) {
 127                         free(buffer);
 128                         buffer = converted;
 129                 }
 130         }
 131
 132         return buffer;
 133 }
 134
 135 static int init_archiver(const char *name, struct archiver *ar)
 136 {
 137         int rv = -1, i;
 138
 139         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 140                 if (!strcmp(name, archivers[i].name)) {
 141                         memset(ar, 0, sizeof(*ar));
 142                         ar->name = archivers[i].name;
 143                         ar->write_archive = archivers[i].write_archive;
 144                         ar->parse_extra = archivers[i].parse_extra;
 145                         rv = 0;
 146                         break;
 147                 }
 148         }
 149         return rv;
 150 }
 151
 152 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 153 {
 154         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 155 }
 156
 157 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 158                        const char *prefix)
 159 {
 160         const char *name = argv[0];
 161         const unsigned char *commit_sha1;
 162         time_t archive_time;
 163         struct tree *tree;
 164         const struct commit *commit;
 165         unsigned char sha1[20];
 166
 167         if (get_sha1(name, sha1))
 168                 die("Not a valid object name");
 169
 170         commit = lookup_commit_reference_gently(sha1, 1);
 171         if (commit) {
 172                 commit_sha1 = commit->object.sha1;
 173                 archive_time = commit->date;
 174         } else {
 175                 commit_sha1 = NULL;
 176                 archive_time = time(NULL);
 177         }
 178
 179         tree = parse_tree_indirect(sha1);
 180         if (tree == NULL)
 181                 die("not a tree object");
 182
 183         if (prefix) {
 184                 unsigned char tree_sha1[20];
 185                 unsigned int mode;
 186                 int err;
 187
 188                 err = get_tree_entry(tree->object.sha1, prefix,
 189                                      tree_sha1, &mode);
 190                 if (err || !S_ISDIR(mode))
 191                         die("current working directory is untracked");
 192
 193                 tree = parse_tree_indirect(tree_sha1);
 194         }
 195         ar_args->tree = tree;
 196         ar_args->commit_sha1 = commit_sha1;
 197         ar_args->commit = commit;
 198         ar_args->time = archive_time;
 199 }
 200
 201 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 202 {
 203         const char *extra_argv[MAX_EXTRA_ARGS];
 204         int extra_argc = 0;
 205         const char *format = "tar";
 206         const char *base = "";
 207         int verbose = 0;
 208         int i;
 209
 210         for (i = 1; i < argc; i++) {
 211                 const char *arg = argv[i];
 212
 213                 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 214                         for (i = 0; i < ARRAY_SIZE(archivers); i++)
 215                                 printf("%s\n", archivers[i].name);
 216                         exit(0);
 217                 }
 218                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 219                         verbose = 1;
 220                         continue;
 221                 }
 222                 if (!prefixcmp(arg, "--format=")) {
 223                         format = arg + 9;
 224                         continue;
 225                 }
 226                 if (!prefixcmp(arg, "--prefix=")) {
 227                         base = arg + 9;
 228                         continue;
 229                 }
 230                 if (!strcmp(arg, "--")) {
 231                         i++;
 232                         break;
 233                 }
 234                 if (arg[0] == '-') {
 235                         if (extra_argc > MAX_EXTRA_ARGS - 1)
 236                                 die("Too many extra options");
 237                         extra_argv[extra_argc++] = arg;
 238                         continue;
 239                 }
 240                 break;
 241         }
 242
 243         /* We need at least one parameter -- tree-ish */
 244         if (argc - 1 < i)
 245                 usage(archive_usage);
 246         if (init_archiver(format, ar) < 0)
 247                 die("Unknown archive format '%s'", format);
 248
 249         if (extra_argc) {
 250                 if (!ar->parse_extra)
 251                         die("'%s' format does not handle %s",
 252                             ar->name, extra_argv[0]);
 253                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 254         }
 255         ar->args.verbose = verbose;
 256         ar->args.base = base;
 257
 258         return i;
 259 }
 260
 261 static const char *extract_remote_arg(int *ac, const char **av)
 262 {
 263         int ix, iy, cnt = *ac;
 264         int no_more_options = 0;
 265         const char *remote = NULL;
 266
 267         for (ix = iy = 1; ix < cnt; ix++) {
 268                 const char *arg = av[ix];
 269                 if (!strcmp(arg, "--"))
 270                         no_more_options = 1;
 271                 if (!no_more_options) {
 272                         if (!prefixcmp(arg, "--remote=")) {
 273                                 if (remote)
 274                                         die("Multiple --remote specified");
 275                                 remote = arg + 9;
 276                                 continue;
 277                         }
 278                         if (arg[0] != '-')
 279                                 no_more_options = 1;
 280                 }
 281                 if (ix != iy)
 282                         av[iy] = arg;
 283                 iy++;
 284         }
 285         if (remote) {
 286                 av[--cnt] = NULL;
 287                 *ac = cnt;
 288         }
 289         return remote;
 290 }
 291
 292 int cmd_archive(int argc, const char **argv, const char *prefix)
 293 {
 294         struct archiver ar;
 295         int tree_idx;
 296         const char *remote = NULL;
 297
 298         remote = extract_remote_arg(&argc, argv);
 299         if (remote)
 300                 return run_remote_archiver(remote, argc, argv);
 301
 302         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 303
 304         memset(&ar, 0, sizeof(ar));
 305         tree_idx = parse_archive_args(argc, argv, &ar);
 306         if (prefix == NULL)
 307                 prefix = setup_git_directory();
 308
 309         argv += tree_idx;
 310         parse_treeish_arg(argv, &ar.args, prefix);
 311         parse_pathspec_arg(argv + 1, &ar.args);
 312
 313         return ar.write_archive(&ar.args);
 314 }