2 * This file is part of DisOrder
3 * Copyright (C) 2005, 2006, 2007 Richard Kettlewell
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.
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.
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
30 #include <sys/types.h>
39 #include "configuration.h"
45 #include "inputline.h"
51 #include "trackdb-int.h"
52 #include "trackname.h"
54 static DB_TXN *global_tid;
56 static const struct option options[] = {
57 { "help", no_argument, 0, 'h' },
58 { "version", no_argument, 0, 'V' },
59 { "config", required_argument, 0, 'c' },
60 { "debug", no_argument, 0, 'd' },
61 { "no-debug", no_argument, 0, 'D' },
65 /* display usage message and terminate */
66 static void help(void) {
68 " disorder-rescan [OPTIONS] [PATH...]\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 " --debug, -d Turn on debugging\n"
75 "Rescanner for DisOrder. Not intended to be run\n"
81 /* display version number and terminate */
82 static void version(void) {
83 xprintf("disorder-rescan version %s\n", disorder_version_string);
88 static volatile sig_atomic_t signalled;
90 static void signal_handler(int sig) {
91 if(sig == 0) _exit(-1); /* "Cannot happen" */
95 static int aborted(void) {
96 return signalled || getppid() == 1;
99 /* Exit if our parent has gone away or we have been told to stop. */
100 static void checkabort(void) {
102 info("parent has terminated");
103 trackdb_abort_transaction(global_tid);
107 info("received signal %d", signalled);
108 trackdb_abort_transaction(global_tid);
113 /* rescan a collection */
114 static void rescan_collection(const struct collection *c) {
119 long ntracks = 0, nnew = 0;
122 info("rescanning %s with %s", c->root, c->module);
123 /* plugin runs in a subprocess */
125 if(!(pid = xfork())) {
130 scan(c->module, c->root);
131 if(fflush(stdout) < 0)
132 fatal(errno, "error writing to scanner pipe");
136 if(!(fp = fdopen(p[0], "r")))
137 fatal(errno, "error calling fdopen");
138 /* read tracks from the plugin */
139 while(!inputline("rescanner", fp, &path, 0)) {
141 /* actually we can cope relatively well within the server, but they'll go
142 * wrong in track listings */
143 if(strchr(path, '\n')) {
144 error(0, "cannot cope with tracks with newlines in the name");
147 if(!(track = any2utf8(c->encoding, path))) {
148 error(0, "cannot convert track path to UTF-8: %s", path);
151 D(("track %s", track));
152 /* only tracks with a known player are admitted */
153 for(n = 0; (n < config->player.n
154 && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n)
156 if(n < config->player.n) {
157 nnew += !!trackdb_notice(track, path);
159 if(ntracks % 1000 == 0)
160 info("rescanning %s, %ld tracks so far", c->root, ntracks);
165 error(errno, "error reading from scanner pipe");
170 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
172 if(r < 0) fatal(errno, "error calling waitpid");
175 error(0, "scanner subprocess: %s", wstat(w));
178 info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew);
183 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
187 struct recheck_state {
188 const struct collection *c;
189 long nobsolete, nnocollection, nlength;
192 /* called for each non-alias track */
193 static int recheck_callback(const char *track,
197 struct recheck_state *cs = u;
198 const struct collection *c = cs->c;
199 const char *path = kvp_get(data, "_path");
204 if(aborted()) return EINTR;
205 D(("rechecking %s", track));
206 /* if we're not checking a specific collection, find the right collection */
208 if(!(c = find_track_collection(track))) {
209 D(("obsoleting %s", track));
210 if((err = trackdb_obsolete(track, tid))) return err;
215 /* see if the track has evaporated */
216 if(check(c->module, c->root, path) == 0) {
217 D(("obsoleting %s", track));
218 if((err = trackdb_obsolete(track, tid))) return err;
222 /* make sure we know the length */
223 if(!kvp_get(data, "_length")) {
224 D(("recalculating length of %s", track));
225 n = tracklength(track, path);
227 byte_snprintf(buffer, sizeof buffer, "%ld", n);
228 kvp_set(&data, "_length", buffer);
229 if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0)))
237 /* recheck a collection */
238 static void recheck_collection(const struct collection *c) {
239 struct recheck_state cs;
242 info("rechecking %s", c->root);
244 info("rechecking all tracks");
247 global_tid = trackdb_begin_transaction();
248 memset(&cs, 0, sizeof cs);
250 if(trackdb_scan(c ? c->root : 0, recheck_callback, &cs, global_tid))
254 /* Maybe we need to shut down */
256 /* Abort the transaction and try again in a bit. */
257 trackdb_abort_transaction(global_tid);
259 /* Let anything else that is going on get out of the way. */
263 info("resuming recheck of %s", c->root);
265 info("resuming global recheck");
267 trackdb_commit_transaction(global_tid);
270 info("rechecked %s, %ld obsoleted, %ld lengths calculated",
271 c->root, cs.nobsolete, cs.nlength);
273 info("rechecked all tracks, %ld no collection, %ld obsoleted, %ld lengths calculated",
274 cs.nnocollection, cs.nobsolete, cs.nlength);
277 /* rescan/recheck a collection by name */
278 static void do_directory(const char *s,
279 void (*fn)(const struct collection *c)) {
282 for(n = 0; (n < config->collection.n
283 && strcmp(config->collection.s[n].root, s)); ++n)
285 if(n < config->collection.n)
286 fn(&config->collection.s[n]);
288 error(0, "no collection has root '%s'", s);
291 /* rescan/recheck all collections */
292 static void do_all(void (*fn)(const struct collection *c)) {
295 for(n = 0; n < config->collection.n; ++n)
296 fn(&config->collection.s[n]);
297 /* TODO: we need to tidy up tracks from collections now removed. We could do
298 * this two ways: either remember collections we think there are and spot
299 * their disappearance, or iterate over all tracks and gc any that don't fit
300 * into some collection.
302 * Having a way to rename collections would be rather convenient too but
303 * that's another kettle of monkeys.
307 /** @brief Expire noticed.db */
308 static void expire_noticed(void) {
312 trackdb_expire_noticed(now - config->noticed_history * 86400);
315 int main(int argc, char **argv) {
321 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
322 while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) {
326 case 'c': configfile = optarg; break;
327 case 'd': debugging = 1; break;
328 case 'D': debugging = 0; break;
329 default: fatal(0, "invalid option");
332 /* If stderr is a TTY then log there, otherwise to syslog. */
334 openlog(progname, LOG_PID, LOG_DAEMON);
335 log_default = &log_syslog;
337 if(config_read(0)) fatal(0, "cannot read configuration");
338 xnice(config->nice_rescan);
339 sa.sa_handler = signal_handler;
340 sa.sa_flags = SA_RESTART;
341 sigemptyset(&sa.sa_mask);
342 xsigaction(SIGTERM, &sa, 0);
343 xsigaction(SIGINT, &sa, 0);
348 /* Rescan all collections */
349 do_all(rescan_collection);
350 /* Check that every track still exists */
351 recheck_collection(0);
352 /* Expire noticed.db */
356 /* Rescan specified collections */
357 for(n = optind; n < argc; ++n)
358 do_directory(argv[n], rescan_collection);
359 /* Check specified collections for tracks that have gone */
360 for(n = optind; n < argc; ++n)
361 do_directory(argv[n], recheck_collection);