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 (prefixcmp(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 (prefixcmp(line, "ok ") && prefixcmp(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
 178int send_pack(struct send_pack_args *args,
 179              int fd[], struct child_process *conn,
 180              struct ref *remote_refs,
 181              struct sha1_array *extra_have)
 182{
 183        int in = fd[0];
 184        int out = fd[1];
 185        struct strbuf req_buf = STRBUF_INIT;
 186        struct ref *ref;
 187        int new_refs;
 188        int allow_deleting_refs = 0;
 189        int status_report = 0;
 190        int use_sideband = 0;
 191        int quiet_supported = 0;
 192        int agent_supported = 0;
 193        unsigned cmds_sent = 0;
 194        int ret;
 195        struct async demux;
 196
 197        /* Does the other end support the reporting? */
 198        if (server_supports("report-status"))
 199                status_report = 1;
 200        if (server_supports("delete-refs"))
 201                allow_deleting_refs = 1;
 202        if (server_supports("ofs-delta"))
 203                args->use_ofs_delta = 1;
 204        if (server_supports("side-band-64k"))
 205                use_sideband = 1;
 206        if (server_supports("quiet"))
 207                quiet_supported = 1;
 208        if (server_supports("agent"))
 209                agent_supported = 1;
 210
 211        if (!remote_refs) {
 212                fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 213                        "Perhaps you should specify a branch such as 'master'.\n");
 214                return 0;
 215        }
 216
 217        /*
 218         * Finally, tell the other end!
 219         */
 220        new_refs = 0;
 221        for (ref = remote_refs; ref; ref = ref->next) {
 222                if (!ref->peer_ref && !args->send_mirror)
 223                        continue;
 224
 225                /* Check for statuses set by set_ref_status_for_push() */
 226                switch (ref->status) {
 227                case REF_STATUS_REJECT_NONFASTFORWARD:
 228                case REF_STATUS_REJECT_ALREADY_EXISTS:
 229                case REF_STATUS_REJECT_FETCH_FIRST:
 230                case REF_STATUS_REJECT_NEEDS_FORCE:
 231                case REF_STATUS_REJECT_STALE:
 232                case REF_STATUS_UPTODATE:
 233                        continue;
 234                default:
 235                        ; /* do nothing */
 236                }
 237
 238                if (ref->deletion && !allow_deleting_refs) {
 239                        ref->status = REF_STATUS_REJECT_NODELETE;
 240                        continue;
 241                }
 242
 243                if (!ref->deletion)
 244                        new_refs++;
 245
 246                if (args->dry_run) {
 247                        ref->status = REF_STATUS_OK;
 248                } else {
 249                        char *old_hex = sha1_to_hex(ref->old_sha1);
 250                        char *new_hex = sha1_to_hex(ref->new_sha1);
 251                        int quiet = quiet_supported && (args->quiet || !args->progress);
 252
 253                        if (!cmds_sent && (status_report || use_sideband ||
 254                                           quiet || agent_supported)) {
 255                                packet_buf_write(&req_buf,
 256                                                 "%s %s %s%c%s%s%s%s%s",
 257                                                 old_hex, new_hex, ref->name, 0,
 258                                                 status_report ? " report-status" : "",
 259                                                 use_sideband ? " side-band-64k" : "",
 260                                                 quiet ? " quiet" : "",
 261                                                 agent_supported ? " agent=" : "",
 262                                                 agent_supported ? git_user_agent_sanitized() : ""
 263                                                );
 264                        }
 265                        else
 266                                packet_buf_write(&req_buf, "%s %s %s",
 267                                                 old_hex, new_hex, ref->name);
 268                        ref->status = status_report ?
 269                                REF_STATUS_EXPECTING_REPORT :
 270                                REF_STATUS_OK;
 271                        cmds_sent++;
 272                }
 273        }
 274
 275        if (args->stateless_rpc) {
 276                if (!args->dry_run && cmds_sent) {
 277                        packet_buf_flush(&req_buf);
 278                        send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 279                }
 280        } else {
 281                write_or_die(out, req_buf.buf, req_buf.len);
 282                packet_flush(out);
 283        }
 284        strbuf_release(&req_buf);
 285
 286        if (use_sideband && cmds_sent) {
 287                memset(&demux, 0, sizeof(demux));
 288                demux.proc = sideband_demux;
 289                demux.data = fd;
 290                demux.out = -1;
 291                if (start_async(&demux))
 292                        die("send-pack: unable to fork off sideband demultiplexer");
 293                in = demux.out;
 294        }
 295
 296        if (new_refs && cmds_sent) {
 297                if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 298                        for (ref = remote_refs; ref; ref = ref->next)
 299                                ref->status = REF_STATUS_NONE;
 300                        if (args->stateless_rpc)
 301                                close(out);
 302                        if (git_connection_is_socket(conn))
 303                                shutdown(fd[0], SHUT_WR);
 304                        if (use_sideband)
 305                                finish_async(&demux);
 306                        fd[1] = -1;
 307                        return -1;
 308                }
 309                if (!args->stateless_rpc)
 310                        /* Closed by pack_objects() via start_command() */
 311                        fd[1] = -1;
 312        }
 313        if (args->stateless_rpc && cmds_sent)
 314                packet_flush(out);
 315
 316        if (status_report && cmds_sent)
 317                ret = receive_status(in, remote_refs);
 318        else
 319                ret = 0;
 320        if (args->stateless_rpc)
 321                packet_flush(out);
 322
 323        if (use_sideband && cmds_sent) {
 324                if (finish_async(&demux)) {
 325                        error("error in sideband demultiplexer");
 326                        ret = -1;
 327                }
 328                close(demux.out);
 329        }
 330
 331        if (ret < 0)
 332                return ret;
 333
 334        if (args->porcelain)
 335                return 0;
 336
 337        for (ref = remote_refs; ref; ref = ref->next) {
 338                switch (ref->status) {
 339                case REF_STATUS_NONE:
 340                case REF_STATUS_UPTODATE:
 341                case REF_STATUS_OK:
 342                        break;
 343                default:
 344                        return -1;
 345                }
 346        }
 347        return 0;
 348}