Andrew's git - gitweb.git/blob

   1#include "builtin.h"
   2#include "commit.h"
   3#include "refs.h"
   4#include "pkt-line.h"
   5#include "sideband.h"
   6#include "run-command.h"
   7#include "remote.h"
   8#include "connect.h"
   9#include "send-pack.h"
  10#include "quote.h"
  11#include "transport.h"
  12#include "version.h"
  13#include "sha1-array.h"
  14
  15static int feed_object(const unsigned char *sha1, int fd, int negative)
  16{
  17        char buf[42];
  18
  19        if (negative && !has_sha1_file(sha1))
  20                return 1;
  21
  22        memcpy(buf + negative, sha1_to_hex(sha1), 40);
  23        if (negative)
  24                buf[0] = '^';
  25        buf[40 + negative] = '\n';
  26        return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  27}
  28
  29/*
  30 * Make a pack stream and spit it out into file descriptor fd
  31 */
  32static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
  33{
  34        /*
  35         * The child becomes pack-objects --revs; we feed
  36         * the revision parameters to it via its stdin and
  37         * let its stdout go back to the other end.
  38         */
  39        const char *argv[] = {
  40                "pack-objects",
  41                "--all-progress-implied",
  42                "--revs",
  43                "--stdout",
  44                NULL,
  45                NULL,
  46                NULL,
  47                NULL,
  48                NULL,
  49        };
  50        struct child_process po;
  51        int i;
  52
  53        i = 4;
  54        if (args->use_thin_pack)
  55                argv[i++] = "--thin";
  56        if (args->use_ofs_delta)
  57                argv[i++] = "--delta-base-offset";
  58        if (args->quiet || !args->progress)
  59                argv[i++] = "-q";
  60        if (args->progress)
  61                argv[i++] = "--progress";
  62        memset(&po, 0, sizeof(po));
  63        po.argv = argv;
  64        po.in = -1;
  65        po.out = args->stateless_rpc ? -1 : fd;
  66        po.git_cmd = 1;
  67        if (start_command(&po))
  68                die_errno("git pack-objects failed");
  69
  70        /*
  71         * We feed the pack-objects we just spawned with revision
  72         * parameters by writing to the pipe.
  73         */
  74        for (i = 0; i < extra->nr; i++)
  75                if (!feed_object(extra->sha1[i], po.in, 1))
  76                        break;
  77
  78        while (refs) {
  79                if (!is_null_sha1(refs->old_sha1) &&
  80                    !feed_object(refs->old_sha1, po.in, 1))
  81                        break;
  82                if (!is_null_sha1(refs->new_sha1) &&
  83                    !feed_object(refs->new_sha1, po.in, 0))
  84                        break;
  85                refs = refs->next;
  86        }
  87
  88        close(po.in);
  89
  90        if (args->stateless_rpc) {
  91                char *buf = xmalloc(LARGE_PACKET_MAX);
  92                while (1) {
  93                        ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
  94                        if (n <= 0)
  95                                break;
  96                        send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
  97                }
  98                free(buf);
  99                close(po.out);
 100                po.out = -1;
 101        }
 102
 103        if (finish_command(&po))
 104                return -1;
 105        return 0;
 106}
 107
 108static int receive_status(int in, struct ref *refs)
 109{
 110        struct ref *hint;
 111        int ret = 0;
 112        char *line = packet_read_line(in, NULL);
 113        if (!starts_with(line, "unpack "))
 114                return error("did not receive remote status");
 115        if (strcmp(line, "unpack ok")) {
 116                error("unpack failed: %s", line + 7);
 117                ret = -1;
 118        }
 119        hint = NULL;
 120        while (1) {
 121                char *refname;
 122                char *msg;
 123                line = packet_read_line(in, NULL);
 124                if (!line)
 125                        break;
 126                if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
 127                        error("invalid ref status from remote: %s", line);
 128                        ret = -1;
 129                        break;
 130                }
 131
 132                refname = line + 3;
 133                msg = strchr(refname, ' ');
 134                if (msg)
 135                        *msg++ = '\0';
 136
 137                /* first try searching at our hint, falling back to all refs */
 138                if (hint)
 139                        hint = find_ref_by_name(hint, refname);
 140                if (!hint)
 141                        hint = find_ref_by_name(refs, refname);
 142                if (!hint) {
 143                        warning("remote reported status on unknown ref: %s",
 144                                        refname);
 145                        continue;
 146                }
 147                if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 148                        warning("remote reported status on unexpected ref: %s",
 149                                        refname);
 150                        continue;
 151                }
 152
 153                if (line[0] == 'o' && line[1] == 'k')
 154                        hint->status = REF_STATUS_OK;
 155                else {
 156                        hint->status = REF_STATUS_REMOTE_REJECT;
 157                        ret = -1;
 158                }
 159                if (msg)
 160                        hint->remote_status = xstrdup(msg);
 161                /* start our next search from the next ref */
 162                hint = hint->next;
 163        }
 164        return ret;
 165}
 166
 167static int sideband_demux(int in, int out, void *data)
 168{
 169        int *fd = data, ret;
 170#ifdef NO_PTHREADS
 171        close(fd[1]);
 172#endif
 173        ret = recv_sideband("send-pack", fd[0], out);
 174        close(out);
 175        return ret;
 176}
 177
 178static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 179{
 180        struct strbuf *sb = cb;
 181        if (graft->nr_parent == -1)
 182                packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
 183        return 0;
 184}
 185
 186static void advertise_shallow_grafts_buf(struct strbuf *sb)
 187{
 188        if (!is_repository_shallow())
 189                return;
 190        for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 191}
 192
 193int send_pack(struct send_pack_args *args,
 194              int fd[], struct child_process *conn,
 195              struct ref *remote_refs,
 196              struct sha1_array *extra_have)
 197{
 198        int in = fd[0];
 199        int out = fd[1];
 200        struct strbuf req_buf = STRBUF_INIT;
 201        struct ref *ref;
 202        int new_refs;
 203        int allow_deleting_refs = 0;
 204        int status_report = 0;
 205        int use_sideband = 0;
 206        int quiet_supported = 0;
 207        int agent_supported = 0;
 208        unsigned cmds_sent = 0;
 209        int ret;
 210        struct async demux;
 211
 212        /* Does the other end support the reporting? */
 213        if (server_supports("report-status"))
 214                status_report = 1;
 215        if (server_supports("delete-refs"))
 216                allow_deleting_refs = 1;
 217        if (server_supports("ofs-delta"))
 218                args->use_ofs_delta = 1;
 219        if (server_supports("side-band-64k"))
 220                use_sideband = 1;
 221        if (server_supports("quiet"))
 222                quiet_supported = 1;
 223        if (server_supports("agent"))
 224                agent_supported = 1;
 225        if (server_supports("no-thin"))
 226                args->use_thin_pack = 0;
 227
 228        if (!remote_refs) {
 229                fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 230                        "Perhaps you should specify a branch such as 'master'.\n");
 231                return 0;
 232        }
 233
 234        if (!args->dry_run)
 235                advertise_shallow_grafts_buf(&req_buf);
 236
 237        /*
 238         * Finally, tell the other end!
 239         */
 240        new_refs = 0;
 241        for (ref = remote_refs; ref; ref = ref->next) {
 242                if (!ref->peer_ref && !args->send_mirror)
 243                        continue;
 244
 245                /* Check for statuses set by set_ref_status_for_push() */
 246                switch (ref->status) {
 247                case REF_STATUS_REJECT_NONFASTFORWARD:
 248                case REF_STATUS_REJECT_ALREADY_EXISTS:
 249                case REF_STATUS_REJECT_FETCH_FIRST:
 250                case REF_STATUS_REJECT_NEEDS_FORCE:
 251                case REF_STATUS_REJECT_STALE:
 252                case REF_STATUS_UPTODATE:
 253                        continue;
 254                default:
 255                        ; /* do nothing */
 256                }
 257
 258                if (ref->deletion && !allow_deleting_refs) {
 259                        ref->status = REF_STATUS_REJECT_NODELETE;
 260                        continue;
 261                }
 262
 263                if (!ref->deletion)
 264                        new_refs++;
 265
 266                if (args->dry_run) {
 267                        ref->status = REF_STATUS_OK;
 268                } else {
 269                        char *old_hex = sha1_to_hex(ref->old_sha1);
 270                        char *new_hex = sha1_to_hex(ref->new_sha1);
 271                        int quiet = quiet_supported && (args->quiet || !args->progress);
 272
 273                        if (!cmds_sent && (status_report || use_sideband ||
 274                                           quiet || agent_supported)) {
 275                                packet_buf_write(&req_buf,
 276                                                 "%s %s %s%c%s%s%s%s%s",
 277                                                 old_hex, new_hex, ref->name, 0,
 278                                                 status_report ? " report-status" : "",
 279                                                 use_sideband ? " side-band-64k" : "",
 280                                                 quiet ? " quiet" : "",
 281                                                 agent_supported ? " agent=" : "",
 282                                                 agent_supported ? git_user_agent_sanitized() : ""
 283                                                );
 284                        }
 285                        else
 286                                packet_buf_write(&req_buf, "%s %s %s",
 287                                                 old_hex, new_hex, ref->name);
 288                        ref->status = status_report ?
 289                                REF_STATUS_EXPECTING_REPORT :
 290                                REF_STATUS_OK;
 291                        cmds_sent++;
 292                }
 293        }
 294
 295        if (args->stateless_rpc) {
 296                if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 297                        packet_buf_flush(&req_buf);
 298                        send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 299                }
 300        } else {
 301                write_or_die(out, req_buf.buf, req_buf.len);
 302                packet_flush(out);
 303        }
 304        strbuf_release(&req_buf);
 305
 306        if (use_sideband && cmds_sent) {
 307                memset(&demux, 0, sizeof(demux));
 308                demux.proc = sideband_demux;
 309                demux.data = fd;
 310                demux.out = -1;
 311                if (start_async(&demux))
 312                        die("send-pack: unable to fork off sideband demultiplexer");
 313                in = demux.out;
 314        }
 315
 316        if (new_refs && cmds_sent) {
 317                if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 318                        for (ref = remote_refs; ref; ref = ref->next)
 319                                ref->status = REF_STATUS_NONE;
 320                        if (args->stateless_rpc)
 321                                close(out);
 322                        if (git_connection_is_socket(conn))
 323                                shutdown(fd[0], SHUT_WR);
 324                        if (use_sideband)
 325                                finish_async(&demux);
 326                        fd[1] = -1;
 327                        return -1;
 328                }
 329                if (!args->stateless_rpc)
 330                        /* Closed by pack_objects() via start_command() */
 331                        fd[1] = -1;
 332        }
 333        if (args->stateless_rpc && cmds_sent)
 334                packet_flush(out);
 335
 336        if (status_report && cmds_sent)
 337                ret = receive_status(in, remote_refs);
 338        else
 339                ret = 0;
 340        if (args->stateless_rpc)
 341                packet_flush(out);
 342
 343        if (use_sideband && cmds_sent) {
 344                if (finish_async(&demux)) {
 345                        error("error in sideband demultiplexer");
 346                        ret = -1;
 347                }
 348                close(demux.out);
 349        }
 350
 351        if (ret < 0)
 352                return ret;
 353
 354        if (args->porcelain)
 355                return 0;
 356
 357        for (ref = remote_refs; ref; ref = ref->next) {
 358                switch (ref->status) {
 359                case REF_STATUS_NONE:
 360                case REF_STATUS_UPTODATE:
 361                case REF_STATUS_OK:
 362                        break;
 363                default:
 364                        return -1;
 365                }
 366        }
 367        return 0;
 368}