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