Andrew's git / gitweb.git / builtin-archive.c
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builtin-archive.con commit git-branch -D: make it work even when on a yet-to-be-born branch (67affd5)
   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#include "sideband.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 (!strncmp("--exec=", arg, 7)) {
  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);
  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 && !strncmp(buf, "NACK ", 5))
  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        rv |= finish_connect(pid);
  79
  80        return !!rv;
  81}
  82
  83static int init_archiver(const char *name, struct archiver *ar)
  84{
  85        int rv = -1, i;
  86
  87        for (i = 0; i < ARRAY_SIZE(archivers); i++) {
  88                if (!strcmp(name, archivers[i].name)) {
  89                        memset(ar, 0, sizeof(*ar));
  90                        ar->name = archivers[i].name;
  91                        ar->write_archive = archivers[i].write_archive;
  92                        ar->parse_extra = archivers[i].parse_extra;
  93                        rv = 0;
  94                        break;
  95                }
  96        }
  97        return rv;
  98}
  99
 100void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
 101{
 102        ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
 103}
 104
 105void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
 106                       const char *prefix)
 107{
 108        const char *name = argv[0];
 109        const unsigned char *commit_sha1;
 110        time_t archive_time;
 111        struct tree *tree;
 112        struct commit *commit;
 113        unsigned char sha1[20];
 114
 115        if (get_sha1(name, sha1))
 116                die("Not a valid object name");
 117
 118        commit = lookup_commit_reference_gently(sha1, 1);
 119        if (commit) {
 120                commit_sha1 = commit->object.sha1;
 121                archive_time = commit->date;
 122        } else {
 123                commit_sha1 = NULL;
 124                archive_time = time(NULL);
 125        }
 126
 127        tree = parse_tree_indirect(sha1);
 128        if (tree == NULL)
 129                die("not a tree object");
 130
 131        if (prefix) {
 132                unsigned char tree_sha1[20];
 133                unsigned int mode;
 134                int err;
 135
 136                err = get_tree_entry(tree->object.sha1, prefix,
 137                                     tree_sha1, &mode);
 138                if (err || !S_ISDIR(mode))
 139                        die("current working directory is untracked");
 140
 141                free(tree);
 142                tree = parse_tree_indirect(tree_sha1);
 143        }
 144        ar_args->tree = tree;
 145        ar_args->commit_sha1 = commit_sha1;
 146        ar_args->time = archive_time;
 147}
 148
 149int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 150{
 151        const char *extra_argv[MAX_EXTRA_ARGS];
 152        int extra_argc = 0;
 153        const char *format = NULL; /* might want to default to "tar" */
 154        const char *base = "";
 155        int verbose = 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                        for (i = 0; i < ARRAY_SIZE(archivers); i++)
 163                                printf("%s\n", archivers[i].name);
 164                        exit(0);
 165                }
 166                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 167                        verbose = 1;
 168                        continue;
 169                }
 170                if (!strncmp(arg, "--format=", 9)) {
 171                        format = arg + 9;
 172                        continue;
 173                }
 174                if (!strncmp(arg, "--prefix=", 9)) {
 175                        base = arg + 9;
 176                        continue;
 177                }
 178                if (!strcmp(arg, "--")) {
 179                        i++;
 180                        break;
 181                }
 182                if (arg[0] == '-') {
 183                        if (extra_argc > MAX_EXTRA_ARGS - 1)
 184                                die("Too many extra options");
 185                        extra_argv[extra_argc++] = arg;
 186                        continue;
 187                }
 188                break;
 189        }
 190
 191        /* We need at least one parameter -- tree-ish */
 192        if (argc - 1 < i)
 193                usage(archive_usage);
 194        if (!format)
 195                die("You must specify an archive format");
 196        if (init_archiver(format, ar) < 0)
 197                die("Unknown archive format '%s'", format);
 198
 199        if (extra_argc) {
 200                if (!ar->parse_extra)
 201                        die("'%s' format does not handle %s",
 202                            ar->name, extra_argv[0]);
 203                ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 204        }
 205        ar->args.verbose = verbose;
 206        ar->args.base = base;
 207
 208        return i;
 209}
 210
 211static const char *extract_remote_arg(int *ac, const char **av)
 212{
 213        int ix, iy, cnt = *ac;
 214        int no_more_options = 0;
 215        const char *remote = NULL;
 216
 217        for (ix = iy = 1; ix < cnt; ix++) {
 218                const char *arg = av[ix];
 219                if (!strcmp(arg, "--"))
 220                        no_more_options = 1;
 221                if (!no_more_options) {
 222                        if (!strncmp(arg, "--remote=", 9)) {
 223                                if (remote)
 224                                        die("Multiple --remote specified");
 225                                remote = arg + 9;
 226                                continue;
 227                        }
 228                        if (arg[0] != '-')
 229                                no_more_options = 1;
 230                }
 231                if (ix != iy)
 232                        av[iy] = arg;
 233                iy++;
 234        }
 235        if (remote) {
 236                av[--cnt] = NULL;
 237                *ac = cnt;
 238        }
 239        return remote;
 240}
 241
 242int cmd_archive(int argc, const char **argv, const char *prefix)
 243{
 244        struct archiver ar;
 245        int tree_idx;
 246        const char *remote = NULL;
 247
 248        remote = extract_remote_arg(&argc, argv);
 249        if (remote)
 250                return run_remote_archiver(remote, argc, argv);
 251
 252        setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 253
 254        memset(&ar, 0, sizeof(ar));
 255        tree_idx = parse_archive_args(argc, argv, &ar);
 256        if (prefix == NULL)
 257                prefix = setup_git_directory();
 258
 259        argv += tree_idx;
 260        parse_treeish_arg(argv, &ar.args, prefix);
 261        parse_pathspec_arg(argv + 1, &ar.args);
 262
 263        return ar.write_archive(&ar.args);
 264}