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 *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
 110void *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
 135static 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
 152void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 153{
 154        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 155}
 156
 157void 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
 201int 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
 261static 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
 292int 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}