mdw@git.distorted.org.uk Git - disorder/blob - server/dump.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <getopt.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <pcre.h>
  30 #include <unistd.h>
  31 #include <db.h>
  32
  33 #include "configuration.h"
  34 #include "syscalls.h"
  35 #include "log.h"
  36 #include "client.h"
  37 #include "sink.h"
  38 #include "mem.h"
  39 #include "defs.h"
  40 #include "printf.h"
  41 #include "kvp.h"
  42 #include "vector.h"
  43 #include "inputline.h"
  44 #include "trackdb.h"
  45 #include "trackdb-int.h"
  46 #include "charset.h"
  47
  48 static const struct option options[] = {
  49   { "help", no_argument, 0, 'h' },
  50   { "version", no_argument, 0, 'V' },
  51   { "config", required_argument, 0, 'c' },
  52   { "dump", no_argument, 0, 'd' },
  53   { "undump", no_argument, 0, 'u' },
  54   { "debug", no_argument, 0, 'D' },
  55   { "recover", no_argument, 0, 'r' },
  56   { "recover-fatal", no_argument, 0, 'R' },
  57   { "trackdb", no_argument, 0, 't' },
  58   { "searchdb", no_argument, 0, 's' },
  59   { "recompute-aliases", no_argument, 0, 'a' },
  60   { "remove-pathless", no_argument, 0, 'P' },
  61   { 0, 0, 0, 0 }
  62 };
  63
  64 /* display usage message and terminate */
  65 static void help(void) {
  66   xprintf("Usage:\n"
  67           "  disorder-dump [OPTIONS] --dump|--undump PATH\n"
  68           "  disorder-dump [OPTIONS] --recompute-aliases\n"
  69           "Options:\n"
  70           "  --help, -h               Display usage message\n"
  71           "  --version, -V            Display version number\n"
  72           "  --config PATH, -c PATH   Set configuration file\n"
  73           "  --dump, -d               Dump state to PATH\n"
  74           "  --undump, -u             Restore state from PATH\n"
  75           "  --recover, -r            Run database recovery\n"
  76           "  --recompute-aliases, -a  Recompute aliases\n"
  77           "  --remove-pathless, -P    Remove pathless tracks\n"
  78           "  --debug                  Debug mode\n");
  79   xfclose(stdout);
  80   exit(0);
  81 }
  82
  83 /* display version number and terminate */
  84 static void version(void) {
  85   xprintf("disorder-dump version %s\n", disorder_version_string);
  86   xfclose(stdout);
  87   exit(0);
  88 }
  89
  90 /* dump prefs to FP, return nonzero on error */
  91 static void do_dump(FILE *fp, const char *tag,
  92                     int tracksdb, int searchdb) {
  93   DBC *cursor = 0;
  94   DB_TXN *tid;
  95   struct sink *s = sink_stdio(tag, fp);
  96   int err;
  97   DBT k, d;
  98
  99   for(;;) {
 100     tid = trackdb_begin_transaction();
 101     if(fseek(fp, 0, SEEK_SET) < 0)
 102       fatal(errno, "error calling fseek");
 103     if(fflush(fp) < 0)
 104       fatal(errno, "error calling fflush");
 105     if(ftruncate(fileno(fp), 0) < 0)
 106       fatal(errno, "error calling ftruncate");
 107     if(fprintf(fp, "V%c\n", (tracksdb || searchdb) ? '1' : '0') < 0)
 108       fatal(errno, "error writing to %s", tag);
 109     /* dump the preferences */
 110     cursor = trackdb_opencursor(trackdb_prefsdb, tid);
 111     err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 112                         DB_FIRST);
 113     while(err == 0) {
 114       if(fputc('P', fp) < 0
 115          || urlencode(s, k.data, k.size)
 116          || fputc('\n', fp) < 0
 117          || urlencode(s, d.data, d.size)
 118          || fputc('\n', fp) < 0)
 119         fatal(errno, "error writing to %s", tag);
 120       err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 121                           DB_NEXT);
 122     }
 123     if(trackdb_closecursor(cursor)) { cursor = 0; goto fail; }
 124     cursor = 0;
 125
 126     /* dump the global preferences */
 127     cursor = trackdb_opencursor(trackdb_globaldb, tid);
 128     err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 129                         DB_FIRST);
 130     while(err == 0) {
 131       if(fputc('G', fp) < 0
 132          || urlencode(s, k.data, k.size)
 133          || fputc('\n', fp) < 0
 134          || urlencode(s, d.data, d.size)
 135          || fputc('\n', fp) < 0)
 136         fatal(errno, "error writing to %s", tag);
 137       err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 138                           DB_NEXT);
 139     }
 140     if(trackdb_closecursor(cursor)) { cursor = 0; goto fail; }
 141     cursor = 0;
 142
 143     if(tracksdb) {
 144       cursor = trackdb_opencursor(trackdb_tracksdb, tid);
 145       err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 146                           DB_FIRST);
 147       while(err == 0) {
 148         if(fputc('T', fp) < 0
 149            || urlencode(s, k.data, k.size)
 150            || fputc('\n', fp) < 0
 151            || urlencode(s, d.data, d.size)
 152            || fputc('\n', fp) < 0)
 153           fatal(errno, "error writing to %s", tag);
 154         err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 155                             DB_NEXT);
 156       }
 157       if(trackdb_closecursor(cursor)) { cursor = 0; goto fail; }
 158       cursor = 0;
 159     }
 160
 161     if(searchdb) {
 162       cursor = trackdb_opencursor(trackdb_searchdb, tid);
 163       err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 164                           DB_FIRST);
 165       while(err == 0) {
 166         if(fputc('S', fp) < 0
 167            || urlencode(s, k.data, k.size)
 168            || fputc('\n', fp) < 0
 169            || urlencode(s, d.data, d.size)
 170            || fputc('\n', fp) < 0)
 171           fatal(errno, "error writing to %s", tag);
 172         err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 173                             DB_NEXT);
 174       }
 175       if(trackdb_closecursor(cursor)) { cursor = 0; goto fail; }      cursor = 0;
 176     }
 177
 178     if(fputs("E\n", fp) < 0) fatal(errno, "error writing to %s", tag);
 179     if(err == DB_LOCK_DEADLOCK) {
 180       error(0, "c->c_get: %s", db_strerror(err));
 181       goto fail;
 182     }
 183     if(err && err != DB_NOTFOUND)
 184       fatal(0, "cursor->c_get: %s", db_strerror(err));
 185     if(trackdb_closecursor(cursor)) { cursor = 0; goto fail; }
 186     break;
 187 fail:
 188     trackdb_closecursor(cursor);
 189     cursor = 0;
 190     info("aborting transaction and retrying dump");
 191     trackdb_abort_transaction(tid);
 192   }
 193   trackdb_commit_transaction(tid);
 194   if(fflush(fp) < 0) fatal(errno, "error writing to %s", tag);
 195   /* caller might not be paranoid so we are paranoid on their behalf */
 196   if(fsync(fileno(fp)) < 0) fatal(errno, "error syncing %s", tag);
 197 }
 198
 199 /* delete all aliases prefs, return 0 or DB_LOCK_DEADLOCK */
 200 static int remove_aliases(DB_TXN *tid, int remove_pathless) {
 201   DBC *cursor;
 202   int err;
 203   DBT k, d;
 204   struct kvp *data;
 205   int alias, pathless;
 206
 207   info("removing aliases");
 208   cursor = trackdb_opencursor(trackdb_tracksdb, tid);
 209   if((err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 210                           DB_FIRST)) == DB_LOCK_DEADLOCK) {
 211     error(0, "cursor->c_get: %s", db_strerror(err));
 212     goto done;
 213   }
 214   while(err == 0) {
 215     data = kvp_urldecode(d.data, d.size);
 216     alias = !!kvp_get(data, "_alias_for");
 217     pathless = !kvp_get(data, "_path");
 218     if(pathless && !remove_pathless)
 219       info("no _path for %s", utf82mb(xstrndup(k.data, k.size)));
 220     if(alias || (remove_pathless && pathless)) {
 221       switch(err = cursor->c_del(cursor, 0)) {
 222       case 0: break;
 223       case DB_LOCK_DEADLOCK:
 224         error(0, "cursor->c_get: %s", db_strerror(err));
 225         goto done;
 226       default:
 227         fatal(0, "cursor->c_del: %s", db_strerror(err));
 228       }
 229     }
 230     err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d), DB_NEXT);
 231   }
 232   if(err == DB_LOCK_DEADLOCK) {
 233     error(0, "cursor operation: %s", db_strerror(err));
 234     goto done;
 235   }
 236   if(err != DB_NOTFOUND) fatal(0, "cursor->c_get: %s", db_strerror(err));
 237   err = 0;
 238 done:
 239   if(trackdb_closecursor(cursor) && !err) err = DB_LOCK_DEADLOCK;
 240   return err;
 241 }
 242
 243 /* truncate (i.e. empty) a database, return 0 or DB_LOCK_DEADLOCK */
 244 static int truncdb(DB_TXN *tid, DB *db) {
 245   int err;
 246   u_int32_t count;
 247
 248   switch(err = db->truncate(db, tid, &count, 0)) {
 249   case 0: break;
 250   case DB_LOCK_DEADLOCK:
 251     error(0, "db->truncate: %s", db_strerror(err));
 252     break;
 253   default:
 254     fatal(0, "db->truncate: %s", db_strerror(err));
 255   }
 256   return err;
 257 }
 258
 259 /* read a DBT from FP, return 0 on success or -1 on input error */
 260 static int undump_dbt(FILE *fp, const char *tag, DBT *dbt) {
 261   char *s;
 262   struct dynstr d;
 263
 264   if(inputline(tag, fp, &s, '\n')) return -1;
 265   dynstr_init(&d);
 266   if(urldecode(sink_dynstr(&d), s, strlen(s)))
 267     fatal(0, "invalid URL-encoded data in %s", tag);
 268   dbt->data = d.vec;
 269   dbt->size = d.nvec;
 270   return 0;
 271 }
 272
 273 /* undump from FP, return 0 or DB_LOCK_DEADLOCK */
 274 static int undump_from_fp(DB_TXN *tid, FILE *fp, const char *tag) {
 275   int err, c;
 276   DBT k, d;
 277   const char *which_name;
 278   DB *which_db;
 279
 280   info("undumping");
 281   if(fseek(fp, 0, SEEK_SET) < 0)
 282     fatal(errno, "error calling fseek on %s", tag);
 283   if((err = truncdb(tid, trackdb_prefsdb))) return err;
 284   if((err = truncdb(tid, trackdb_searchdb))) return err;
 285   c = getc(fp);
 286   while(!ferror(fp) && !feof(fp)) {
 287     switch(c) {
 288     case 'V':
 289       c = getc(fp);
 290       if(c != '0')
 291         fatal(0, "unknown version '%c'", c);
 292       break;
 293     case 'E':
 294       return 0;
 295     case 'P':
 296     case 'G':
 297       if(c == 'P') {
 298         which_db = trackdb_prefsdb;
 299         which_name = "prefs.db";
 300       } else {
 301         which_db = trackdb_globaldb;
 302         which_name = "global.db";
 303       }
 304       if(undump_dbt(fp, tag, prepare_data(&k))
 305          || undump_dbt(fp, tag, prepare_data(&d)))
 306         break;
 307       switch(err = trackdb_prefsdb->put(which_db, tid, &k, &d, 0)) {
 308       case 0:
 309         break;
 310       case DB_LOCK_DEADLOCK:
 311         error(0, "error updating %s: %s", which_name, db_strerror(err));
 312         return err;
 313       default:
 314         fatal(0, "error updating %s: %s", which_name, db_strerror(err));
 315       }
 316       break;
 317     case 'T':
 318     case 'S':
 319       if(undump_dbt(fp, tag, prepare_data(&k))
 320          || undump_dbt(fp, tag, prepare_data(&d)))
 321         break;
 322       /* We don't restore the tracks.db or search.db entries, instead
 323        * we recompute them */
 324       break;
 325     case '\n':
 326       break;
 327     }
 328     c = getc(fp);
 329   }
 330   if(ferror(fp))
 331     fatal(errno, "error reading %s", tag);
 332   else
 333     fatal(0, "unexpected EOF reading %s", tag);
 334   return 0;
 335 }
 336
 337 /* recompute aliases and search database from prefs, return 0 or
 338  * DB_LOCK_DEADLOCK */
 339 static int recompute_aliases(DB_TXN *tid) {
 340   DBC *cursor;
 341   DBT k, d;
 342   int err;
 343   struct kvp *data;
 344   const char *path, *track;
 345
 346   info("recomputing aliases");
 347   cursor = trackdb_opencursor(trackdb_tracksdb, tid);
 348   if((err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 349                           DB_FIRST)) == DB_LOCK_DEADLOCK) goto done;
 350   while(err == 0) {
 351     data = kvp_urldecode(d.data, d.size);
 352     track = xstrndup(k.data, k.size);
 353     if(!kvp_get(data, "_alias_for")) {
 354       if(!(path = kvp_get(data, "_path")))
 355         error(0, "%s is not an alias but has no path", utf82mb(track));
 356       else
 357         if((err = trackdb_notice_tid(track, path, tid)) == DB_LOCK_DEADLOCK)
 358           goto done;
 359     }
 360     err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
 361                         DB_NEXT);
 362   }
 363   switch(err) {
 364   case 0:
 365     break;
 366   case DB_NOTFOUND:
 367     err = 0;
 368     break;
 369   case DB_LOCK_DEADLOCK:
 370     break;
 371   default:
 372     fatal(0, "cursor->c_get: %s", db_strerror(err));
 373   }
 374 done:
 375   if(trackdb_closecursor(cursor) && !err) err = DB_LOCK_DEADLOCK;
 376   return err;
 377 }
 378
 379 /* restore prefs from FP */
 380 static void do_undump(FILE *fp, const char *tag, int remove_pathless) {
 381   DB_TXN *tid;
 382
 383   for(;;) {
 384     tid = trackdb_begin_transaction();
 385     if(remove_aliases(tid, remove_pathless)
 386        || undump_from_fp(tid, fp, tag)
 387        || recompute_aliases(tid)) goto fail;
 388     break;
 389 fail:
 390     info("aborting transaction and retrying undump");
 391     trackdb_abort_transaction(tid);
 392   }
 393   info("committing undump");
 394   trackdb_commit_transaction(tid);
 395 }
 396
 397 /* just recompute alisaes */
 398 static void do_recompute(int remove_pathless) {
 399   DB_TXN *tid;
 400
 401   for(;;) {
 402     tid = trackdb_begin_transaction();
 403     if(remove_aliases(tid, remove_pathless)
 404        || recompute_aliases(tid)) goto fail;
 405     break;
 406 fail:
 407     info("aborting transaction and retrying recomputation");
 408     trackdb_abort_transaction(tid);
 409   }
 410   info("committing recomputed aliases");
 411   trackdb_commit_transaction(tid);
 412 }
 413
 414 int main(int argc, char **argv) {
 415   int n, dump = 0, undump = 0, recover = TRACKDB_NO_RECOVER, recompute = 0;
 416   int tracksdb = 0, searchdb = 0, remove_pathless = 0;
 417   const char *path;
 418   char *tmp;
 419   FILE *fp;
 420
 421   mem_init();
 422   while((n = getopt_long(argc, argv, "hVc:dDutsrRaP", options, 0)) >= 0) {
 423     switch(n) {
 424     case 'h': help();
 425     case 'V': version();
 426     case 'c': configfile = optarg; break;
 427     case 'd': dump = 1; break;
 428     case 'u': undump = 1; break;
 429     case 'D': debugging = 1; break;
 430     case 't': tracksdb = 1; break;
 431     case 's': searchdb = 1; break;
 432     case 'r': recover = TRACKDB_NORMAL_RECOVER;
 433     case 'R': recover = TRACKDB_FATAL_RECOVER;
 434     case 'a': recompute = 1; break;
 435     case 'P': remove_pathless = 1; break;
 436     default: fatal(0, "invalid option");
 437     }
 438   }
 439   if(dump + undump + recompute != 1)
 440     fatal(0, "choose exactly one of --dump, --undump or --recompute-aliases");
 441   if((undump || recompute) && (tracksdb || searchdb))
 442     fatal(0, "--trackdb and --searchdb with --undump or --recompute-aliases");
 443   if(recompute) {
 444     if(optind != argc)
 445       fatal(0, "--recompute-aliases does not take a filename");
 446     path = 0;
 447   } else {
 448     if(optind >= argc)
 449       fatal(0, "missing dump file name");
 450     if(optind + 1 < argc)
 451       fatal(0, "specify only a dump file name");
 452     path = argv[optind];
 453   }
 454   if(config_read(0)) fatal(0, "cannot read configuration");
 455   trackdb_init(recover);
 456   trackdb_open(TRACKDB_NO_UPGRADE);
 457   if(dump) {
 458     /* we write to a temporary file and rename into place */
 459     byte_xasprintf(&tmp, "%s.%lx.tmp", path, (unsigned long)getpid());
 460     if(!(fp = fopen(tmp, "w"))) fatal(errno, "error opening %s", tmp);
 461     do_dump(fp, tmp, tracksdb, searchdb);
 462     if(fclose(fp) < 0) fatal(errno, "error closing %s", tmp);
 463     if(rename(tmp, path) < 0)
 464       fatal(errno, "error renaming %s to %s", tmp, path);
 465   } else if(undump) {
 466     /* the databases or logfiles might end up with wrong permissions
 467      * if new ones are created */
 468     if(getuid() == 0) info("you might need to chown database files");
 469     if(!(fp = fopen(path, "r"))) fatal(errno, "error opening %s", path);
 470     do_undump(fp, path, remove_pathless);
 471     xfclose(fp);
 472   } else if(recompute) {
 473     do_recompute(remove_pathless);
 474   }
 475   trackdb_close();
 476   trackdb_deinit();
 477   return 0;
 478 }
 479
 480 /*
 481 Local Variables:
 482 c-basic-offset:2
 483 comment-column:40
 484 End:
 485 */