send-pack.c

   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
  15 static 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  */
  32 static 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
 108 static 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
 167 static 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
 178 static 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
 186 static 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
 193 static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
 194 {
 195         if (!ref->peer_ref && !args->send_mirror)
 196                 return 0;
 197
 198         /* Check for statuses set by set_ref_status_for_push() */
 199         switch (ref->status) {
 200         case REF_STATUS_REJECT_NONFASTFORWARD:
 201         case REF_STATUS_REJECT_ALREADY_EXISTS:
 202         case REF_STATUS_REJECT_FETCH_FIRST:
 203         case REF_STATUS_REJECT_NEEDS_FORCE:
 204         case REF_STATUS_REJECT_STALE:
 205         case REF_STATUS_REJECT_NODELETE:
 206         case REF_STATUS_UPTODATE:
 207                 return 0;
 208         default:
 209                 return 1;
 210         }
 211 }
 212
 213 int send_pack(struct send_pack_args *args,
 214               int fd[], struct child_process *conn,
 215               struct ref *remote_refs,
 216               struct sha1_array *extra_have)
 217 {
 218         int in = fd[0];
 219         int out = fd[1];
 220         struct strbuf req_buf = STRBUF_INIT;
 221         struct strbuf cap_buf = STRBUF_INIT;
 222         struct ref *ref;
 223         int need_pack_data = 0;
 224         int allow_deleting_refs = 0;
 225         int status_report = 0;
 226         int use_sideband = 0;
 227         int quiet_supported = 0;
 228         int agent_supported = 0;
 229         unsigned cmds_sent = 0;
 230         int ret;
 231         struct async demux;
 232
 233         /* Does the other end support the reporting? */
 234         if (server_supports("report-status"))
 235                 status_report = 1;
 236         if (server_supports("delete-refs"))
 237                 allow_deleting_refs = 1;
 238         if (server_supports("ofs-delta"))
 239                 args->use_ofs_delta = 1;
 240         if (server_supports("side-band-64k"))
 241                 use_sideband = 1;
 242         if (server_supports("quiet"))
 243                 quiet_supported = 1;
 244         if (server_supports("agent"))
 245                 agent_supported = 1;
 246         if (server_supports("no-thin"))
 247                 args->use_thin_pack = 0;
 248
 249         if (!remote_refs) {
 250                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 251                         "Perhaps you should specify a branch such as 'master'.\n");
 252                 return 0;
 253         }
 254
 255         if (status_report)
 256                 strbuf_addstr(&cap_buf, " report-status");
 257         if (use_sideband)
 258                 strbuf_addstr(&cap_buf, " side-band-64k");
 259         if (quiet_supported && (args->quiet || !args->progress))
 260                 strbuf_addstr(&cap_buf, " quiet");
 261         if (agent_supported)
 262                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 263
 264         /*
 265          * NEEDSWORK: why does delete-refs have to be so specific to
 266          * send-pack machinery that set_ref_status_for_push() cannot
 267          * set this bit for us???
 268          */
 269         for (ref = remote_refs; ref; ref = ref->next)
 270                 if (ref->deletion && !allow_deleting_refs)
 271                         ref->status = REF_STATUS_REJECT_NODELETE;
 272
 273         if (!args->dry_run)
 274                 advertise_shallow_grafts_buf(&req_buf);
 275
 276         /*
 277          * Clear the status for each ref and see if we need to send
 278          * the pack data.
 279          */
 280         for (ref = remote_refs; ref; ref = ref->next) {
 281                 if (!ref_update_to_be_sent(ref, args))
 282                         continue;
 283
 284                 if (!ref->deletion)
 285                         need_pack_data = 1;
 286
 287                 if (args->dry_run || !status_report)
 288                         ref->status = REF_STATUS_OK;
 289                 else
 290                         ref->status = REF_STATUS_EXPECTING_REPORT;
 291         }
 292
 293         /*
 294          * Finally, tell the other end!
 295          */
 296         for (ref = remote_refs; ref; ref = ref->next) {
 297                 char *old_hex, *new_hex;
 298
 299                 if (args->dry_run)
 300                         continue;
 301
 302                 if (!ref_update_to_be_sent(ref, args))
 303                         continue;
 304
 305                 old_hex = sha1_to_hex(ref->old_sha1);
 306                 new_hex = sha1_to_hex(ref->new_sha1);
 307                 if (!cmds_sent) {
 308                         packet_buf_write(&req_buf,
 309                                          "%s %s %s%c%s",
 310                                          old_hex, new_hex, ref->name, 0,
 311                                          cap_buf.buf);
 312                         cmds_sent = 1;
 313                 } else {
 314                         packet_buf_write(&req_buf, "%s %s %s",
 315                                          old_hex, new_hex, ref->name);
 316                 }
 317         }
 318
 319         if (args->stateless_rpc) {
 320                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 321                         packet_buf_flush(&req_buf);
 322                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 323                 }
 324         } else {
 325                 write_or_die(out, req_buf.buf, req_buf.len);
 326                 packet_flush(out);
 327         }
 328         strbuf_release(&req_buf);
 329         strbuf_release(&cap_buf);
 330
 331         if (use_sideband && cmds_sent) {
 332                 memset(&demux, 0, sizeof(demux));
 333                 demux.proc = sideband_demux;
 334                 demux.data = fd;
 335                 demux.out = -1;
 336                 if (start_async(&demux))
 337                         die("send-pack: unable to fork off sideband demultiplexer");
 338                 in = demux.out;
 339         }
 340
 341         if (need_pack_data && cmds_sent) {
 342                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 343                         for (ref = remote_refs; ref; ref = ref->next)
 344                                 ref->status = REF_STATUS_NONE;
 345                         if (args->stateless_rpc)
 346                                 close(out);
 347                         if (git_connection_is_socket(conn))
 348                                 shutdown(fd[0], SHUT_WR);
 349                         if (use_sideband)
 350                                 finish_async(&demux);
 351                         fd[1] = -1;
 352                         return -1;
 353                 }
 354                 if (!args->stateless_rpc)
 355                         /* Closed by pack_objects() via start_command() */
 356                         fd[1] = -1;
 357         }
 358         if (args->stateless_rpc && cmds_sent)
 359                 packet_flush(out);
 360
 361         if (status_report && cmds_sent)
 362                 ret = receive_status(in, remote_refs);
 363         else
 364                 ret = 0;
 365         if (args->stateless_rpc)
 366                 packet_flush(out);
 367
 368         if (use_sideband && cmds_sent) {
 369                 if (finish_async(&demux)) {
 370                         error("error in sideband demultiplexer");
 371                         ret = -1;
 372                 }
 373                 close(demux.out);
 374         }
 375
 376         if (ret < 0)
 377                 return ret;
 378
 379         if (args->porcelain)
 380                 return 0;
 381
 382         for (ref = remote_refs; ref; ref = ref->next) {
 383                 switch (ref->status) {
 384                 case REF_STATUS_NONE:
 385                 case REF_STATUS_UPTODATE:
 386                 case REF_STATUS_OK:
 387                         break;
 388                 default:
 389                         return -1;
 390                 }
 391         }
 392         return 0;
 393 }