send-pack.con commit Merge branch 'ss/svnimport' (3a22917)
   1#include "cache.h"
   2#include "commit.h"
   3#include "tag.h"
   4#include "refs.h"
   5#include "pkt-line.h"
   6#include "run-command.h"
   7#include "remote.h"
   8
   9static const char send_pack_usage[] =
  10"git-send-pack [--all] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  11"  --all and explicit <ref> specification are mutually exclusive.";
  12static const char *receivepack = "git-receive-pack";
  13static int verbose;
  14static int send_all;
  15static int force_update;
  16static int use_thin_pack;
  17
  18/*
  19 * Make a pack stream and spit it out into file descriptor fd
  20 */
  21static int pack_objects(int fd, struct ref *refs)
  22{
  23        /*
  24         * The child becomes pack-objects --revs; we feed
  25         * the revision parameters to it via its stdin and
  26         * let its stdout go back to the other end.
  27         */
  28        const char *args[] = {
  29                "pack-objects",
  30                "--all-progress",
  31                "--revs",
  32                "--stdout",
  33                NULL,
  34                NULL,
  35        };
  36        struct child_process po;
  37
  38        if (use_thin_pack)
  39                args[4] = "--thin";
  40        memset(&po, 0, sizeof(po));
  41        po.argv = args;
  42        po.in = -1;
  43        po.out = fd;
  44        po.git_cmd = 1;
  45        if (start_command(&po))
  46                die("git-pack-objects failed (%s)", strerror(errno));
  47
  48        /*
  49         * We feed the pack-objects we just spawned with revision
  50         * parameters by writing to the pipe.
  51         */
  52        while (refs) {
  53                char buf[42];
  54
  55                if (!is_null_sha1(refs->old_sha1) &&
  56                    has_sha1_file(refs->old_sha1)) {
  57                        memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  58                        buf[0] = '^';
  59                        buf[41] = '\n';
  60                        if (!write_or_whine(po.in, buf, 42,
  61                                                "send-pack: send refs"))
  62                                break;
  63                }
  64                if (!is_null_sha1(refs->new_sha1)) {
  65                        memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  66                        buf[40] = '\n';
  67                        if (!write_or_whine(po.in, buf, 41,
  68                                                "send-pack: send refs"))
  69                                break;
  70                }
  71                refs = refs->next;
  72        }
  73
  74        if (finish_command(&po))
  75                return error("pack-objects died with strange error");
  76        return 0;
  77}
  78
  79static void unmark_and_free(struct commit_list *list, unsigned int mark)
  80{
  81        while (list) {
  82                struct commit_list *temp = list;
  83                temp->item->object.flags &= ~mark;
  84                list = temp->next;
  85                free(temp);
  86        }
  87}
  88
  89static int ref_newer(const unsigned char *new_sha1,
  90                     const unsigned char *old_sha1)
  91{
  92        struct object *o;
  93        struct commit *old, *new;
  94        struct commit_list *list, *used;
  95        int found = 0;
  96
  97        /* Both new and old must be commit-ish and new is descendant of
  98         * old.  Otherwise we require --force.
  99         */
 100        o = deref_tag(parse_object(old_sha1), NULL, 0);
 101        if (!o || o->type != OBJ_COMMIT)
 102                return 0;
 103        old = (struct commit *) o;
 104
 105        o = deref_tag(parse_object(new_sha1), NULL, 0);
 106        if (!o || o->type != OBJ_COMMIT)
 107                return 0;
 108        new = (struct commit *) o;
 109
 110        if (parse_commit(new) < 0)
 111                return 0;
 112
 113        used = list = NULL;
 114        commit_list_insert(new, &list);
 115        while (list) {
 116                new = pop_most_recent_commit(&list, 1);
 117                commit_list_insert(new, &used);
 118                if (new == old) {
 119                        found = 1;
 120                        break;
 121                }
 122        }
 123        unmark_and_free(list, 1);
 124        unmark_and_free(used, 1);
 125        return found;
 126}
 127
 128static struct ref *local_refs, **local_tail;
 129static struct ref *remote_refs, **remote_tail;
 130
 131static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 132{
 133        struct ref *ref;
 134        int len = strlen(refname) + 1;
 135        ref = xcalloc(1, sizeof(*ref) + len);
 136        hashcpy(ref->new_sha1, sha1);
 137        memcpy(ref->name, refname, len);
 138        *local_tail = ref;
 139        local_tail = &ref->next;
 140        return 0;
 141}
 142
 143static void get_local_heads(void)
 144{
 145        local_tail = &local_refs;
 146        for_each_ref(one_local_ref, NULL);
 147}
 148
 149static int receive_status(int in)
 150{
 151        char line[1000];
 152        int ret = 0;
 153        int len = packet_read_line(in, line, sizeof(line));
 154        if (len < 10 || memcmp(line, "unpack ", 7)) {
 155                fprintf(stderr, "did not receive status back\n");
 156                return -1;
 157        }
 158        if (memcmp(line, "unpack ok\n", 10)) {
 159                fputs(line, stderr);
 160                ret = -1;
 161        }
 162        while (1) {
 163                len = packet_read_line(in, line, sizeof(line));
 164                if (!len)
 165                        break;
 166                if (len < 3 ||
 167                    (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
 168                        fprintf(stderr, "protocol error: %s\n", line);
 169                        ret = -1;
 170                        break;
 171                }
 172                if (!memcmp(line, "ok", 2))
 173                        continue;
 174                fputs(line, stderr);
 175                ret = -1;
 176        }
 177        return ret;
 178}
 179
 180static int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
 181{
 182        struct ref *ref;
 183        int new_refs;
 184        int ret = 0;
 185        int ask_for_status_report = 0;
 186        int allow_deleting_refs = 0;
 187        int expect_status_report = 0;
 188
 189        /* No funny business with the matcher */
 190        remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 191        get_local_heads();
 192
 193        /* Does the other end support the reporting? */
 194        if (server_supports("report-status"))
 195                ask_for_status_report = 1;
 196        if (server_supports("delete-refs"))
 197                allow_deleting_refs = 1;
 198
 199        /* match them up */
 200        if (!remote_tail)
 201                remote_tail = &remote_refs;
 202        if (match_refs(local_refs, remote_refs, &remote_tail,
 203                       nr_refspec, refspec, send_all))
 204                return -1;
 205
 206        if (!remote_refs) {
 207                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
 208                return 0;
 209        }
 210
 211        /*
 212         * Finally, tell the other end!
 213         */
 214        new_refs = 0;
 215        for (ref = remote_refs; ref; ref = ref->next) {
 216                char old_hex[60], *new_hex;
 217                int will_delete_ref;
 218
 219                if (!ref->peer_ref)
 220                        continue;
 221
 222
 223                will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 224                if (will_delete_ref && !allow_deleting_refs) {
 225                        error("remote does not support deleting refs");
 226                        ret = -2;
 227                        continue;
 228                }
 229                if (!will_delete_ref &&
 230                    !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
 231                        if (verbose)
 232                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
 233                        continue;
 234                }
 235
 236                /* This part determines what can overwrite what.
 237                 * The rules are:
 238                 *
 239                 * (0) you can always use --force or +A:B notation to
 240                 *     selectively force individual ref pairs.
 241                 *
 242                 * (1) if the old thing does not exist, it is OK.
 243                 *
 244                 * (2) if you do not have the old thing, you are not allowed
 245                 *     to overwrite it; you would not know what you are losing
 246                 *     otherwise.
 247                 *
 248                 * (3) if both new and old are commit-ish, and new is a
 249                 *     descendant of old, it is OK.
 250                 *
 251                 * (4) regardless of all of the above, removing :B is
 252                 *     always allowed.
 253                 */
 254
 255                if (!force_update &&
 256                    !will_delete_ref &&
 257                    !is_null_sha1(ref->old_sha1) &&
 258                    !ref->force) {
 259                        if (!has_sha1_file(ref->old_sha1) ||
 260                            !ref_newer(ref->peer_ref->new_sha1,
 261                                       ref->old_sha1)) {
 262                                /* We do not have the remote ref, or
 263                                 * we know that the remote ref is not
 264                                 * an ancestor of what we are trying to
 265                                 * push.  Either way this can be losing
 266                                 * commits at the remote end and likely
 267                                 * we were not up to date to begin with.
 268                                 */
 269                                error("remote '%s' is not a strict "
 270                                      "subset of local ref '%s'. "
 271                                      "maybe you are not up-to-date and "
 272                                      "need to pull first?",
 273                                      ref->name,
 274                                      ref->peer_ref->name);
 275                                ret = -2;
 276                                continue;
 277                        }
 278                }
 279                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 280                if (!will_delete_ref)
 281                        new_refs++;
 282                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 283                new_hex = sha1_to_hex(ref->new_sha1);
 284
 285                if (ask_for_status_report) {
 286                        packet_write(out, "%s %s %s%c%s",
 287                                     old_hex, new_hex, ref->name, 0,
 288                                     "report-status");
 289                        ask_for_status_report = 0;
 290                        expect_status_report = 1;
 291                }
 292                else
 293                        packet_write(out, "%s %s %s",
 294                                     old_hex, new_hex, ref->name);
 295                if (will_delete_ref)
 296                        fprintf(stderr, "deleting '%s'\n", ref->name);
 297                else {
 298                        fprintf(stderr, "updating '%s'", ref->name);
 299                        if (strcmp(ref->name, ref->peer_ref->name))
 300                                fprintf(stderr, " using '%s'",
 301                                        ref->peer_ref->name);
 302                        fprintf(stderr, "\n  from %s\n  to   %s\n",
 303                                old_hex, new_hex);
 304                }
 305                if (remote) {
 306                        struct refspec rs;
 307                        rs.src = ref->name;
 308                        rs.dst = NULL;
 309                        if (!remote_find_tracking(remote, &rs)) {
 310                                fprintf(stderr, " Also local %s\n", rs.dst);
 311                                if (will_delete_ref) {
 312                                        if (delete_ref(rs.dst, NULL)) {
 313                                                error("Failed to delete");
 314                                        }
 315                                } else
 316                                        update_ref("update by push", rs.dst,
 317                                                ref->new_sha1, NULL, 0, 0);
 318                                free(rs.dst);
 319                        }
 320                }
 321        }
 322
 323        packet_flush(out);
 324        if (new_refs)
 325                ret = pack_objects(out, remote_refs);
 326        close(out);
 327
 328        if (expect_status_report) {
 329                if (receive_status(in))
 330                        ret = -4;
 331        }
 332
 333        if (!new_refs && ret == 0)
 334                fprintf(stderr, "Everything up-to-date\n");
 335        return ret;
 336}
 337
 338static void verify_remote_names(int nr_heads, char **heads)
 339{
 340        int i;
 341
 342        for (i = 0; i < nr_heads; i++) {
 343                const char *remote = strchr(heads[i], ':');
 344
 345                remote = remote ? (remote + 1) : heads[i];
 346                switch (check_ref_format(remote)) {
 347                case 0: /* ok */
 348                case -2: /* ok but a single level -- that is fine for
 349                          * a match pattern.
 350                          */
 351                case -3: /* ok but ends with a pattern-match character */
 352                        continue;
 353                }
 354                die("remote part of refspec is not a valid name in %s",
 355                    heads[i]);
 356        }
 357}
 358
 359int main(int argc, char **argv)
 360{
 361        int i, nr_heads = 0;
 362        char *dest = NULL;
 363        char **heads = NULL;
 364        int fd[2], ret;
 365        pid_t pid;
 366        char *remote_name = NULL;
 367        struct remote *remote = NULL;
 368
 369        setup_git_directory();
 370        git_config(git_default_config);
 371
 372        argv++;
 373        for (i = 1; i < argc; i++, argv++) {
 374                char *arg = *argv;
 375
 376                if (*arg == '-') {
 377                        if (!prefixcmp(arg, "--receive-pack=")) {
 378                                receivepack = arg + 15;
 379                                continue;
 380                        }
 381                        if (!prefixcmp(arg, "--exec=")) {
 382                                receivepack = arg + 7;
 383                                continue;
 384                        }
 385                        if (!prefixcmp(arg, "--remote=")) {
 386                                remote_name = arg + 9;
 387                                continue;
 388                        }
 389                        if (!strcmp(arg, "--all")) {
 390                                send_all = 1;
 391                                continue;
 392                        }
 393                        if (!strcmp(arg, "--force")) {
 394                                force_update = 1;
 395                                continue;
 396                        }
 397                        if (!strcmp(arg, "--verbose")) {
 398                                verbose = 1;
 399                                continue;
 400                        }
 401                        if (!strcmp(arg, "--thin")) {
 402                                use_thin_pack = 1;
 403                                continue;
 404                        }
 405                        usage(send_pack_usage);
 406                }
 407                if (!dest) {
 408                        dest = arg;
 409                        continue;
 410                }
 411                heads = argv;
 412                nr_heads = argc - i;
 413                break;
 414        }
 415        if (!dest)
 416                usage(send_pack_usage);
 417        if (heads && send_all)
 418                usage(send_pack_usage);
 419        verify_remote_names(nr_heads, heads);
 420
 421        if (remote_name) {
 422                remote = remote_get(remote_name);
 423                if (!remote_has_uri(remote, dest)) {
 424                        die("Destination %s is not a uri for %s",
 425                            dest, remote_name);
 426                }
 427        }
 428
 429        pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
 430        if (pid < 0)
 431                return 1;
 432        ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
 433        close(fd[0]);
 434        close(fd[1]);
 435        ret |= finish_connect(pid);
 436        return !!ret;
 437}