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>
38 #include "configuration.h"
44 #include "inputline.h"
50 #include "trackdb-int.h"
51 #include "trackname.h"
53 static DB_TXN *global_tid;
55 static const struct option options[] = {
56 { "help", no_argument, 0, 'h' },
57 { "version", no_argument, 0, 'V' },
58 { "config", required_argument, 0, 'c' },
59 { "debug", no_argument, 0, 'd' },
60 { "no-debug", no_argument, 0, 'D' },
64 /* display usage message and terminate */
65 static void help(void) {
67 " disorder-rescan [OPTIONS] [PATH...]\n"
69 " --help, -h Display usage message\n"
70 " --version, -V Display version number\n"
71 " --config PATH, -c PATH Set configuration file\n"
72 " --debug, -d Turn on debugging\n"
74 "Rescanner for DisOrder. Not intended to be run\n"
80 /* display version number and terminate */
81 static void version(void) {
82 xprintf("disorder-rescan version %s\n", disorder_version_string);
87 static volatile sig_atomic_t signalled;
89 static void signal_handler(int sig) {
90 if(sig == 0) _exit(-1); /* "Cannot happen" */
94 static int aborted(void) {
95 return signalled || getppid() == 1;
98 /* Exit if our parent has gone away or we have been told to stop. */
99 static void checkabort(void) {
101 info("parent has terminated");
102 trackdb_abort_transaction(global_tid);
106 info("received signal %d", signalled);
107 trackdb_abort_transaction(global_tid);
112 /* rescan a collection */
113 static void rescan_collection(const struct collection *c) {
118 long ntracks = 0, nnew = 0;
121 info("rescanning %s with %s", c->root, c->module);
122 /* plugin runs in a subprocess */
124 if(!(pid = xfork())) {
129 scan(c->module, c->root);
130 if(fflush(stdout) < 0)
131 fatal(errno, "error writing to scanner pipe");
135 if(!(fp = fdopen(p[0], "r")))
136 fatal(errno, "error calling fdopen");
137 /* read tracks from the plugin */
138 while(!inputline("rescanner", fp, &path, 0)) {
140 /* actually we can cope relatively well within the server, but they'll go
141 * wrong in track listings */
142 if(strchr(path, '\n')) {
143 error(0, "cannot cope with tracks with newlines in the name");
146 if(!(track = any2utf8(c->encoding, path))) {
147 error(0, "cannot convert track path to UTF-8: %s", path);
150 D(("track %s", track));
151 /* only tracks with a known player are admitted */
152 for(n = 0; (n < config->player.n
153 && fnmatch(config->player.s[n].s[0], track, 0) != 0); ++n)
155 if(n < config->player.n) {
156 nnew += !!trackdb_notice(track, path);
158 if(ntracks % 1000 == 0)
159 info("rescanning %s, %ld tracks so far", c->root, ntracks);
164 error(errno, "error reading from scanner pipe");
169 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
171 if(r < 0) fatal(errno, "error calling waitpid");
174 error(0, "scanner subprocess: %s", wstat(w));
177 info("rescanned %s, %ld tracks, %ld new", c->root, ntracks, nnew);
182 while((r = waitpid(pid, &w, 0)) == -1 && errno == EINTR)
186 struct recheck_state {
187 const struct collection *c;
188 long nobsolete, nnocollection, nlength;
191 /* called for each non-alias track */
192 static int recheck_callback(const char *track,
196 struct recheck_state *cs = u;
197 const struct collection *c = cs->c;
198 const char *path = kvp_get(data, "_path");
203 if(aborted()) return EINTR;
204 D(("rechecking %s", track));
205 /* if we're not checking a specific collection, find the right collection */
207 if(!(c = find_track_collection(track))) {
208 D(("obsoleting %s", track));
209 if((err = trackdb_obsolete(track, tid))) return err;
214 /* see if the track has evaporated */
215 if(check(c->module, c->root, path) == 0) {
216 D(("obsoleting %s", track));
217 if((err = trackdb_obsolete(track, tid))) return err;
221 /* make sure we know the length */
222 if(!kvp_get(data, "_length")) {
223 D(("recalculating length of %s", track));
224 n = tracklength(track, path);
226 byte_snprintf(buffer, sizeof buffer, "%ld", n);
227 kvp_set(&data, "_length", buffer);
228 if((err = trackdb_putdata(trackdb_tracksdb, track, data, tid, 0)))
236 /* recheck a collection */
237 static void recheck_collection(const struct collection *c) {
238 struct recheck_state cs;
241 info("rechecking %s", c->root);
243 info("rechecking all tracks");
246 global_tid = trackdb_begin_transaction();
247 memset(&cs, 0, sizeof cs);
249 if(trackdb_scan(c ? c->root : 0, recheck_callback, &cs, global_tid))
253 /* Maybe we need to shut down */
255 /* Abort the transaction and try again in a bit. */
256 trackdb_abort_transaction(global_tid);
258 /* Let anything else that is going on get out of the way. */
262 info("resuming recheck of %s", c->root);
264 info("resuming global recheck");
266 trackdb_commit_transaction(global_tid);
269 info("rechecked %s, %ld obsoleted, %ld lengths calculated",
270 c->root, cs.nobsolete, cs.nlength);
272 info("rechecked all tracks, %ld no collection, %ld obsoleted, %ld lengths calculated",
273 cs.nnocollection, cs.nobsolete, cs.nlength);
276 /* rescan/recheck a collection by name */
277 static void do_directory(const char *s,
278 void (*fn)(const struct collection *c)) {
281 for(n = 0; (n < config->collection.n
282 && strcmp(config->collection.s[n].root, s)); ++n)
284 if(n < config->collection.n)
285 fn(&config->collection.s[n]);
287 error(0, "no collection has root '%s'", s);
290 /* rescan/recheck all collections */
291 static void do_all(void (*fn)(const struct collection *c)) {
294 for(n = 0; n < config->collection.n; ++n)
295 fn(&config->collection.s[n]);
296 /* TODO: we need to tidy up tracks from collections now removed. We could do
297 * this two ways: either remember collections we think there are and spot
298 * their disappearance, or iterate over all tracks and gc any that don't fit
299 * into some collection.
301 * Having a way to rename collections would be rather convenient too but
302 * that's another kettle of monkeys.
306 int main(int argc, char **argv) {
312 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
313 while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) {
317 case 'c': configfile = optarg; break;
318 case 'd': debugging = 1; break;
319 case 'D': debugging = 0; break;
320 default: fatal(0, "invalid option");
323 /* If stderr is a TTY then log there, otherwise to syslog. */
325 openlog(progname, LOG_PID, LOG_DAEMON);
326 log_default = &log_syslog;
328 if(config_read()) fatal(0, "cannot read configuration");
329 xnice(config->nice_rescan);
330 sa.sa_handler = signal_handler;
331 sa.sa_flags = SA_RESTART;
332 sigemptyset(&sa.sa_mask);
333 xsigaction(SIGTERM, &sa, 0);
334 xsigaction(SIGINT, &sa, 0);
339 /* Rescan all collections */
340 do_all(rescan_collection);
341 /* Check that every track still exists */
342 recheck_collection(0);
345 /* Rescan specified collections */
346 for(n = optind; n < argc; ++n)
347 do_directory(argv[n], rescan_collection);
348 /* Check specified collections for tracks that have gone */
349 for(n = optind; n < argc; ++n)
350 do_directory(argv[n], recheck_collection);