/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * Copyright (C) 2008 Max Kellermann <max@duempel.org> * This project's homepage is: http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "database.h" #include "directory.h" #include "song.h" #include "conf.h" #include "log.h" #include "ls.h" #include "path.h" #include "stats.h" #include "utils.h" #include "dbUtils.h" #include "update.h" #include <assert.h> #include <string.h> static struct directory *music_root; static time_t directory_dbModTime; void db_init(void) { music_root = directory_new("", NULL); updateDirectory(music_root); stats.numberOfSongs = countSongsIn(NULL); stats.dbPlayTime = sumSongTimesIn(NULL); } void db_finish(void) { directory_free(music_root); } struct directory * db_get_root(void) { assert(music_root != NULL); return music_root; } struct directory * db_get_directory(const char *name) { if (name == NULL) return music_root; return directory_get_directory(music_root, name); } struct song * get_get_song(const char *file) { struct song *song = NULL; struct directory *directory; char *dir = NULL; char *duplicated = xstrdup(file); char *shortname = strrchr(duplicated, '/'); DEBUG("get song: %s\n", file); if (!shortname) { shortname = duplicated; } else { *shortname = '\0'; ++shortname; dir = duplicated; } if (!(directory = db_get_directory(dir))) goto out; if (!(song = songvec_find(&directory->songs, shortname))) goto out; assert(song->parent == directory); out: free(duplicated); return song; } int db_walk(const char *name, int (*forEachSong)(struct song *, void *), int (*forEachDir)(struct directory *, void *), void *data) { struct directory *directory; if ((directory = db_get_directory(name)) == NULL) { struct song *song; if ((song = get_get_song(name)) && forEachSong) { return forEachSong(song, data); } return -1; } return directory_walk(directory, forEachSong, forEachDir, data); } static char * db_get_file(void) { ConfigParam *param = parseConfigFilePath(CONF_DB_FILE, 1); assert(param); assert(param->value); return param->value; } int db_check(void) { struct stat st; char *dbFile = db_get_file(); /* Check if the file exists */ if (access(dbFile, F_OK)) { /* If the file doesn't exist, we can't check if we can write * it, so we are going to try to get the directory path, and * see if we can write a file in that */ char dirPath[MPD_PATH_MAX]; parent_path(dirPath, dbFile); if (*dirPath == '\0') strcpy(dirPath, "/"); /* Check that the parent part of the path is a directory */ if (stat(dirPath, &st) < 0) { ERROR("Couldn't stat parent directory of db file " "\"%s\": %s\n", dbFile, strerror(errno)); return -1; } if (!S_ISDIR(st.st_mode)) { ERROR("Couldn't create db file \"%s\" because the " "parent path is not a directory\n", dbFile); return -1; } /* Check if we can write to the directory */ if (access(dirPath, R_OK | W_OK)) { ERROR("Can't create db file in \"%s\": %s\n", dirPath, strerror(errno)); return -1; } return 0; } /* Path exists, now check if it's a regular file */ if (stat(dbFile, &st) < 0) { ERROR("Couldn't stat db file \"%s\": %s\n", dbFile, strerror(errno)); return -1; } if (!S_ISREG(st.st_mode)) { ERROR("db file \"%s\" is not a regular file\n", dbFile); return -1; } /* And check that we can write to it */ if (access(dbFile, R_OK | W_OK)) { ERROR("Can't open db file \"%s\" for reading/writing: %s\n", dbFile, strerror(errno)); return -1; } return 0; } int db_save(void) { FILE *fp; char *dbFile = db_get_file(); struct stat st; DEBUG("removing empty directories from DB\n"); directory_prune_empty(music_root); DEBUG("sorting DB\n"); directory_sort(music_root); DEBUG("writing DB\n"); fp = fopen(dbFile, "w"); if (!fp) { ERROR("unable to write to db file \"%s\": %s\n", dbFile, strerror(errno)); return -1; } /* block signals when writing the db so we don't get a corrupted db */ fprintf(fp, "%s\n", DIRECTORY_INFO_BEGIN); fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION); fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, getFsCharset()); fprintf(fp, "%s\n", DIRECTORY_INFO_END); if (directory_save(fp, music_root) < 0) { ERROR("Failed to write to database file: %s\n", strerror(errno)); while (fclose(fp) && errno == EINTR); return -1; } while (fclose(fp) && errno == EINTR); if (stat(dbFile, &st) == 0) directory_dbModTime = st.st_mtime; return 0; } int db_load(void) { FILE *fp = NULL; char *dbFile = db_get_file(); struct stat st; if (!music_root) music_root = directory_new("", NULL); while (!(fp = fopen(dbFile, "r")) && errno == EINTR) ; if (fp == NULL) { ERROR("unable to open db file \"%s\": %s\n", dbFile, strerror(errno)); return -1; } /* get initial info */ { char buffer[100]; int bufferSize = 100; int foundFsCharset = 0; int foundVersion = 0; if (!myFgets(buffer, bufferSize, fp)) FATAL("Error reading db, fgets\n"); if (0 == strcmp(DIRECTORY_INFO_BEGIN, buffer)) { while (myFgets(buffer, bufferSize, fp) && 0 != strcmp(DIRECTORY_INFO_END, buffer)) { if (!prefixcmp(buffer, DIRECTORY_MPD_VERSION)) { if (foundVersion) FATAL("already found version in db\n"); foundVersion = 1; } else if (!prefixcmp(buffer, DIRECTORY_FS_CHARSET)) { char *fsCharset; char *tempCharset; if (foundFsCharset) FATAL("already found fs charset in db\n"); foundFsCharset = 1; fsCharset = &(buffer[strlen(DIRECTORY_FS_CHARSET)]); if ((tempCharset = getConfigParamValue(CONF_FS_CHARSET)) && strcmp(fsCharset, tempCharset)) { WARNING("Using \"%s\" for the " "filesystem charset " "instead of \"%s\"\n", fsCharset, tempCharset); WARNING("maybe you need to " "recreate the db?\n"); setFsCharset(fsCharset); } } else { FATAL("directory: unknown line in db info: %s\n", buffer); } } } else { ERROR("db info not found in db file\n"); ERROR("you should recreate the db using --create-db\n"); while (fclose(fp) && errno == EINTR) ; return -1; } } DEBUG("reading DB\n"); directory_load(fp, music_root); while (fclose(fp) && errno == EINTR) ; stats.numberOfSongs = countSongsIn(NULL); stats.dbPlayTime = sumSongTimesIn(NULL); if (stat(dbFile, &st) == 0) directory_dbModTime = st.st_mtime; return 0; } time_t db_get_mtime(void) { return directory_dbModTime; }