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 *format_subst(const struct commit *commit, const char *format,
  85                           unsigned long *sizep)
  86 {
  87         unsigned long len = *sizep;
  88         const char *a = format;
  89         struct strbuf result;
  90         struct strbuf fmt;
  91
  92         strbuf_init(&result, 0);
  93         strbuf_init(&fmt, 0);
  94
  95         for (;;) {
  96                 const char *b, *c;
  97
  98                 b = memmem(a, len, "$Format:", 8);
  99                 if (!b || a + len < b + 9)
 100                         break;
 101                 c = memchr(b + 8, '$', len - 8);
 102                 if (!c)
 103                         break;
 104
 105                 strbuf_reset(&fmt);
 106                 strbuf_add(&fmt, b + 8, c - b - 8);
 107
 108                 strbuf_add(&result, a, b - a);
 109                 format_commit_message(commit, fmt.buf, &result);
 110                 len -= c + 1 - a;
 111                 a = c + 1;
 112         }
 113
 114         strbuf_add(&result, a, len);
 115
 116         *sizep = result.len;
 117
 118         strbuf_release(&fmt);
 119         return strbuf_detach(&result);
 120 }
 121
 122 static void *convert_to_archive(const char *path,
 123                                 const void *src, unsigned long *sizep,
 124                                 const struct commit *commit)
 125 {
 126         static struct git_attr *attr_export_subst;
 127         struct git_attr_check check[1];
 128
 129         if (!commit)
 130                 return NULL;
 131
 132         if (!attr_export_subst)
 133                 attr_export_subst = git_attr("export-subst", 12);
 134
 135         check[0].attr = attr_export_subst;
 136         if (git_checkattr(path, ARRAY_SIZE(check), check))
 137                 return NULL;
 138         if (!ATTR_TRUE(check[0].value))
 139                 return NULL;
 140
 141         return format_subst(commit, src, sizep);
 142 }
 143
 144 void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 145                            unsigned int mode, enum object_type *type,
 146                            unsigned long *size,
 147                            const struct commit *commit)
 148 {
 149         void *buffer, *converted;
 150
 151         buffer = read_sha1_file(sha1, type, size);
 152         if (buffer && S_ISREG(mode)) {
 153                 converted = convert_to_working_tree(path, buffer, size);
 154                 if (converted) {
 155                         free(buffer);
 156                         buffer = converted;
 157                 }
 158
 159                 converted = convert_to_archive(path, buffer, size, commit);
 160                 if (converted) {
 161                         free(buffer);
 162                         buffer = converted;
 163                 }
 164         }
 165
 166         return buffer;
 167 }
 168
 169 static int init_archiver(const char *name, struct archiver *ar)
 170 {
 171         int rv = -1, i;
 172
 173         for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 174                 if (!strcmp(name, archivers[i].name)) {
 175                         memset(ar, 0, sizeof(*ar));
 176                         ar->name = archivers[i].name;
 177                         ar->write_archive = archivers[i].write_archive;
 178                         ar->parse_extra = archivers[i].parse_extra;
 179                         rv = 0;
 180                         break;
 181                 }
 182         }
 183         return rv;
 184 }
 185
 186 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 187 {
 188         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 189 }
 190
 191 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 192                        const char *prefix)
 193 {
 194         const char *name = argv[0];
 195         const unsigned char *commit_sha1;
 196         time_t archive_time;
 197         struct tree *tree;
 198         const struct commit *commit;
 199         unsigned char sha1[20];
 200
 201         if (get_sha1(name, sha1))
 202                 die("Not a valid object name");
 203
 204         commit = lookup_commit_reference_gently(sha1, 1);
 205         if (commit) {
 206                 commit_sha1 = commit->object.sha1;
 207                 archive_time = commit->date;
 208         } else {
 209                 commit_sha1 = NULL;
 210                 archive_time = time(NULL);
 211         }
 212
 213         tree = parse_tree_indirect(sha1);
 214         if (tree == NULL)
 215                 die("not a tree object");
 216
 217         if (prefix) {
 218                 unsigned char tree_sha1[20];
 219                 unsigned int mode;
 220                 int err;
 221
 222                 err = get_tree_entry(tree->object.sha1, prefix,
 223                                      tree_sha1, &mode);
 224                 if (err || !S_ISDIR(mode))
 225                         die("current working directory is untracked");
 226
 227                 tree = parse_tree_indirect(tree_sha1);
 228         }
 229         ar_args->tree = tree;
 230         ar_args->commit_sha1 = commit_sha1;
 231         ar_args->commit = commit;
 232         ar_args->time = archive_time;
 233 }
 234
 235 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 236 {
 237         const char *extra_argv[MAX_EXTRA_ARGS];
 238         int extra_argc = 0;
 239         const char *format = "tar";
 240         const char *base = "";
 241         int verbose = 0;
 242         int i;
 243
 244         for (i = 1; i < argc; i++) {
 245                 const char *arg = argv[i];
 246
 247                 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 248                         for (i = 0; i < ARRAY_SIZE(archivers); i++)
 249                                 printf("%s\n", archivers[i].name);
 250                         exit(0);
 251                 }
 252                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 253                         verbose = 1;
 254                         continue;
 255                 }
 256                 if (!prefixcmp(arg, "--format=")) {
 257                         format = arg + 9;
 258                         continue;
 259                 }
 260                 if (!prefixcmp(arg, "--prefix=")) {
 261                         base = arg + 9;
 262                         continue;
 263                 }
 264                 if (!strcmp(arg, "--")) {
 265                         i++;
 266                         break;
 267                 }
 268                 if (arg[0] == '-') {
 269                         if (extra_argc > MAX_EXTRA_ARGS - 1)
 270                                 die("Too many extra options");
 271                         extra_argv[extra_argc++] = arg;
 272                         continue;
 273                 }
 274                 break;
 275         }
 276
 277         /* We need at least one parameter -- tree-ish */
 278         if (argc - 1 < i)
 279                 usage(archive_usage);
 280         if (init_archiver(format, ar) < 0)
 281                 die("Unknown archive format '%s'", format);
 282
 283         if (extra_argc) {
 284                 if (!ar->parse_extra)
 285                         die("'%s' format does not handle %s",
 286                             ar->name, extra_argv[0]);
 287                 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 288         }
 289         ar->args.verbose = verbose;
 290         ar->args.base = base;
 291
 292         return i;
 293 }
 294
 295 static const char *extract_remote_arg(int *ac, const char **av)
 296 {
 297         int ix, iy, cnt = *ac;
 298         int no_more_options = 0;
 299         const char *remote = NULL;
 300
 301         for (ix = iy = 1; ix < cnt; ix++) {
 302                 const char *arg = av[ix];
 303                 if (!strcmp(arg, "--"))
 304                         no_more_options = 1;
 305                 if (!no_more_options) {
 306                         if (!prefixcmp(arg, "--remote=")) {
 307                                 if (remote)
 308                                         die("Multiple --remote specified");
 309                                 remote = arg + 9;
 310                                 continue;
 311                         }
 312                         if (arg[0] != '-')
 313                                 no_more_options = 1;
 314                 }
 315                 if (ix != iy)
 316                         av[iy] = arg;
 317                 iy++;
 318         }
 319         if (remote) {
 320                 av[--cnt] = NULL;
 321                 *ac = cnt;
 322         }
 323         return remote;
 324 }
 325
 326 int cmd_archive(int argc, const char **argv, const char *prefix)
 327 {
 328         struct archiver ar;
 329         int tree_idx;
 330         const char *remote = NULL;
 331
 332         remote = extract_remote_arg(&argc, argv);
 333         if (remote)
 334                 return run_remote_archiver(remote, argc, argv);
 335
 336         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 337
 338         memset(&ar, 0, sizeof(ar));
 339         tree_idx = parse_archive_args(argc, argv, &ar);
 340         if (prefix == NULL)
 341                 prefix = setup_git_directory();
 342
 343         argv += tree_idx;
 344         parse_treeish_arg(argv, &ar.args, prefix);
 345         parse_pathspec_arg(argv + 1, &ar.args);
 346
 347         return ar.write_archive(&ar.args);
 348 }