Andrew's git - gitweb.git/blob

   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
  15static const char archive_usage[] = \
  16"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
  17
  18static 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
  28static 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
  84static void *format_specfile(const struct commit *commit, const char *format,
  85                             unsigned long *sizep)
  86{
  87        unsigned long len = *sizep, result_len = 0;
  88        const char *a = format;
  89        char *result = NULL;
  90
  91        for (;;) {
  92                const char *b, *c;
  93                char *fmt, *formatted = NULL;
  94                unsigned long a_len, fmt_len, formatted_len, allocated = 0;
  95
  96                b = memmem(a, len, "$Format:", 8);
  97                if (!b || a + len < b + 9)
  98                        break;
  99                c = memchr(b + 8, '$', len - 8);
 100                if (!c)
 101                        break;
 102
 103                a_len = b - a;
 104                fmt_len = c - b - 8;
 105                fmt = xmalloc(fmt_len + 1);
 106                memcpy(fmt, b + 8, fmt_len);
 107                fmt[fmt_len] = '\0';
 108
 109                formatted_len = format_commit_message(commit, fmt, &formatted,
 110                                                      &allocated);
 111                result = xrealloc(result, result_len + a_len + formatted_len);
 112                memcpy(result + result_len, a, a_len);
 113                memcpy(result + result_len + a_len, formatted, formatted_len);
 114                result_len += a_len + formatted_len;
 115                len -= c + 1 - a;
 116                a = c + 1;
 117        }
 118
 119        if (result && len) {
 120                result = xrealloc(result, result_len + len);
 121                memcpy(result + result_len, a, len);
 122                result_len += len;
 123        }
 124
 125        *sizep = result_len;
 126
 127        return result;
 128}
 129
 130static void *convert_to_archive(const char *path,
 131                                const void *src, unsigned long *sizep,
 132                                const struct commit *commit)
 133{
 134        static struct git_attr *attr_specfile;
 135        struct git_attr_check check[1];
 136
 137        if (!commit)
 138                return NULL;
 139
 140        if (!attr_specfile)
 141                attr_specfile = git_attr("specfile", 8);
 142
 143        check[0].attr = attr_specfile;
 144        if (git_checkattr(path, ARRAY_SIZE(check), check))
 145                return NULL;
 146        if (!ATTR_TRUE(check[0].value))
 147                return NULL;
 148
 149        return format_specfile(commit, src, sizep);
 150}
 151
 152void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
 153                           unsigned int mode, enum object_type *type,
 154                           unsigned long *size,
 155                           const struct commit *commit)
 156{
 157        void *buffer, *converted;
 158
 159        buffer = read_sha1_file(sha1, type, size);
 160        if (buffer && S_ISREG(mode)) {
 161                converted = convert_to_working_tree(path, buffer, size);
 162                if (converted) {
 163                        free(buffer);
 164                        buffer = converted;
 165                }
 166
 167                converted = convert_to_archive(path, buffer, size, commit);
 168                if (converted) {
 169                        free(buffer);
 170                        buffer = converted;
 171                }
 172        }
 173
 174        return buffer;
 175}
 176
 177static int init_archiver(const char *name, struct archiver *ar)
 178{
 179        int rv = -1, i;
 180
 181        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 182                if (!strcmp(name, archivers[i].name)) {
 183                        memset(ar, 0, sizeof(*ar));
 184                        ar->name = archivers[i].name;
 185                        ar->write_archive = archivers[i].write_archive;
 186                        ar->parse_extra = archivers[i].parse_extra;
 187                        rv = 0;
 188                        break;
 189                }
 190        }
 191        return rv;
 192}
 193
 194void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 195{
 196        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 197}
 198
 199void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 200                       const char *prefix)
 201{
 202        const char *name = argv[0];
 203        const unsigned char *commit_sha1;
 204        time_t archive_time;
 205        struct tree *tree;
 206        const struct commit *commit;
 207        unsigned char sha1[20];
 208
 209        if (get_sha1(name, sha1))
 210                die("Not a valid object name");
 211
 212        commit = lookup_commit_reference_gently(sha1, 1);
 213        if (commit) {
 214                commit_sha1 = commit->object.sha1;
 215                archive_time = commit->date;
 216        } else {
 217                commit_sha1 = NULL;
 218                archive_time = time(NULL);
 219        }
 220
 221        tree = parse_tree_indirect(sha1);
 222        if (tree == NULL)
 223                die("not a tree object");
 224
 225        if (prefix) {
 226                unsigned char tree_sha1[20];
 227                unsigned int mode;
 228                int err;
 229
 230                err = get_tree_entry(tree->object.sha1, prefix,
 231                                     tree_sha1, &mode);
 232                if (err || !S_ISDIR(mode))
 233                        die("current working directory is untracked");
 234
 235                tree = parse_tree_indirect(tree_sha1);
 236        }
 237        ar_args->tree = tree;
 238        ar_args->commit_sha1 = commit_sha1;
 239        ar_args->commit = commit;
 240        ar_args->time = archive_time;
 241}
 242
 243int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 244{
 245        const char *extra_argv[MAX_EXTRA_ARGS];
 246        int extra_argc = 0;
 247        const char *format = "tar";
 248        const char *base = "";
 249        int verbose = 0;
 250        int i;
 251
 252        for (i = 1; i < argc; i++) {
 253                const char *arg = argv[i];
 254
 255                if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 256                        for (i = 0; i < ARRAY_SIZE(archivers); i++)
 257                                printf("%s\n", archivers[i].name);
 258                        exit(0);
 259                }
 260                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 261                        verbose = 1;
 262                        continue;
 263                }
 264                if (!prefixcmp(arg, "--format=")) {
 265                        format = arg + 9;
 266                        continue;
 267                }
 268                if (!prefixcmp(arg, "--prefix=")) {
 269                        base = arg + 9;
 270                        continue;
 271                }
 272                if (!strcmp(arg, "--")) {
 273                        i++;
 274                        break;
 275                }
 276                if (arg[0] == '-') {
 277                        if (extra_argc > MAX_EXTRA_ARGS - 1)
 278                                die("Too many extra options");
 279                        extra_argv[extra_argc++] = arg;
 280                        continue;
 281                }
 282                break;
 283        }
 284
 285        /* We need at least one parameter -- tree-ish */
 286        if (argc - 1 < i)
 287                usage(archive_usage);
 288        if (init_archiver(format, ar) < 0)
 289                die("Unknown archive format '%s'", format);
 290
 291        if (extra_argc) {
 292                if (!ar->parse_extra)
 293                        die("'%s' format does not handle %s",
 294                            ar->name, extra_argv[0]);
 295                ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 296        }
 297        ar->args.verbose = verbose;
 298        ar->args.base = base;
 299
 300        return i;
 301}
 302
 303static const char *extract_remote_arg(int *ac, const char **av)
 304{
 305        int ix, iy, cnt = *ac;
 306        int no_more_options = 0;
 307        const char *remote = NULL;
 308
 309        for (ix = iy = 1; ix < cnt; ix++) {
 310                const char *arg = av[ix];
 311                if (!strcmp(arg, "--"))
 312                        no_more_options = 1;
 313                if (!no_more_options) {
 314                        if (!prefixcmp(arg, "--remote=")) {
 315                                if (remote)
 316                                        die("Multiple --remote specified");
 317                                remote = arg + 9;
 318                                continue;
 319                        }
 320                        if (arg[0] != '-')
 321                                no_more_options = 1;
 322                }
 323                if (ix != iy)
 324                        av[iy] = arg;
 325                iy++;
 326        }
 327        if (remote) {
 328                av[--cnt] = NULL;
 329                *ac = cnt;
 330        }
 331        return remote;
 332}
 333
 334int cmd_archive(int argc, const char **argv, const char *prefix)
 335{
 336        struct archiver ar;
 337        int tree_idx;
 338        const char *remote = NULL;
 339
 340        remote = extract_remote_arg(&argc, argv);
 341        if (remote)
 342                return run_remote_archiver(remote, argc, argv);
 343
 344        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 345
 346        memset(&ar, 0, sizeof(ar));
 347        tree_idx = parse_archive_args(argc, argv, &ar);
 348        if (prefix == NULL)
 349                prefix = setup_git_directory();
 350
 351        argv += tree_idx;
 352        parse_treeish_arg(argv, &ar.args, prefix);
 353        parse_pathspec_arg(argv + 1, &ar.args);
 354
 355        return ar.write_archive(&ar.args);
 356}