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-rw-r--r--src/update_walk.c759
1 files changed, 759 insertions, 0 deletions
diff --git a/src/update_walk.c b/src/update_walk.c
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+++ b/src/update_walk.c
@@ -0,0 +1,759 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "update_internal.h"
+#include "database.h"
+#include "directory.h"
+#include "song.h"
+#include "uri.h"
+#include "mapper.h"
+#include "path.h"
+#include "decoder_list.h"
+#include "decoder_plugin.h"
+#include "conf.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+static bool walk_discard;
+static bool modified;
+
+#ifndef WIN32
+
+enum {
+ DEFAULT_FOLLOW_INSIDE_SYMLINKS = true,
+ DEFAULT_FOLLOW_OUTSIDE_SYMLINKS = true,
+};
+
+static bool follow_inside_symlinks;
+static bool follow_outside_symlinks;
+
+#endif
+
+void
+update_walk_global_init(void)
+{
+#ifndef WIN32
+ follow_inside_symlinks =
+ config_get_bool(CONF_FOLLOW_INSIDE_SYMLINKS,
+ DEFAULT_FOLLOW_INSIDE_SYMLINKS);
+
+ follow_outside_symlinks =
+ config_get_bool(CONF_FOLLOW_OUTSIDE_SYMLINKS,
+ DEFAULT_FOLLOW_OUTSIDE_SYMLINKS);
+#endif
+}
+
+void
+update_walk_global_finish(void)
+{
+}
+
+static void
+directory_set_stat(struct directory *dir, const struct stat *st)
+{
+ dir->inode = st->st_ino;
+ dir->device = st->st_dev;
+ dir->stat = 1;
+}
+
+static void
+delete_song(struct directory *dir, struct song *del)
+{
+ /* first, prevent traversers in main task from getting this */
+ songvec_delete(&dir->songs, del);
+
+ /* now take it out of the playlist (in the main_task) */
+ update_remove_song(del);
+
+ /* finally, all possible references gone, free it */
+ song_free(del);
+}
+
+static int
+delete_each_song(struct song *song, G_GNUC_UNUSED void *data)
+{
+ struct directory *directory = data;
+ assert(song->parent == directory);
+ delete_song(directory, song);
+ return 0;
+}
+
+static void
+delete_directory(struct directory *directory);
+
+/**
+ * Recursively remove all sub directories and songs from a directory,
+ * leaving an empty directory.
+ */
+static void
+clear_directory(struct directory *directory)
+{
+ int i;
+
+ for (i = directory->children.nr; --i >= 0;)
+ delete_directory(directory->children.base[i]);
+
+ assert(directory->children.nr == 0);
+
+ songvec_for_each(&directory->songs, delete_each_song, directory);
+}
+
+/**
+ * Recursively free a directory and all its contents.
+ */
+static void
+delete_directory(struct directory *directory)
+{
+ assert(directory->parent != NULL);
+
+ clear_directory(directory);
+
+ dirvec_delete(&directory->parent->children, directory);
+ directory_free(directory);
+}
+
+static void
+delete_name_in(struct directory *parent, const char *name)
+{
+ struct directory *directory = directory_get_child(parent, name);
+ struct song *song = songvec_find(&parent->songs, name);
+
+ if (directory != NULL) {
+ delete_directory(directory);
+ modified = true;
+ }
+
+ if (song != NULL) {
+ delete_song(parent, song);
+ modified = true;
+ }
+}
+
+/* passed to songvec_for_each */
+static int
+delete_song_if_removed(struct song *song, void *_data)
+{
+ struct directory *dir = _data;
+ char *path;
+ struct stat st;
+
+ if ((path = map_song_fs(song)) == NULL ||
+ stat(path, &st) < 0 || !S_ISREG(st.st_mode)) {
+ delete_song(dir, song);
+ modified = true;
+ }
+
+ g_free(path);
+ return 0;
+}
+
+static bool
+directory_exists(const struct directory *directory)
+{
+ char *path_fs;
+ GFileTest test;
+ bool exists;
+
+ path_fs = map_directory_fs(directory);
+ if (path_fs == NULL)
+ /* invalid path: cannot exist */
+ return false;
+
+ test = directory->device == DEVICE_INARCHIVE ||
+ directory->device == DEVICE_CONTAINER
+ ? G_FILE_TEST_IS_REGULAR
+ : G_FILE_TEST_IS_DIR;
+
+ exists = g_file_test(path_fs, test);
+ g_free(path_fs);
+
+ return exists;
+}
+
+static void
+removeDeletedFromDirectory(struct directory *directory)
+{
+ int i;
+ struct dirvec *dv = &directory->children;
+
+ for (i = dv->nr; --i >= 0; ) {
+ if (directory_exists(dv->base[i]))
+ continue;
+
+ g_debug("removing directory: %s", dv->base[i]->path);
+ delete_directory(dv->base[i]);
+ modified = true;
+ }
+
+ songvec_for_each(&directory->songs, delete_song_if_removed, directory);
+}
+
+static int
+stat_directory(const struct directory *directory, struct stat *st)
+{
+ char *path_fs;
+ int ret;
+
+ path_fs = map_directory_fs(directory);
+ if (path_fs == NULL)
+ return -1;
+ ret = stat(path_fs, st);
+ g_free(path_fs);
+ return ret;
+}
+
+static int
+stat_directory_child(const struct directory *parent, const char *name,
+ struct stat *st)
+{
+ char *path_fs;
+ int ret;
+
+ path_fs = map_directory_child_fs(parent, name);
+ if (path_fs == NULL)
+ return -1;
+
+ ret = stat(path_fs, st);
+ g_free(path_fs);
+ return ret;
+}
+
+static int
+statDirectory(struct directory *dir)
+{
+ struct stat st;
+
+ if (stat_directory(dir, &st) < 0)
+ return -1;
+
+ directory_set_stat(dir, &st);
+
+ return 0;
+}
+
+static int
+inodeFoundInParent(struct directory *parent, ino_t inode, dev_t device)
+{
+ while (parent) {
+ if (!parent->stat && statDirectory(parent) < 0)
+ return -1;
+ if (parent->inode == inode && parent->device == device) {
+ g_debug("recursive directory found");
+ return 1;
+ }
+ parent = parent->parent;
+ }
+
+ return 0;
+}
+
+static struct directory *
+make_subdir(struct directory *parent, const char *name)
+{
+ struct directory *directory;
+
+ directory = directory_get_child(parent, name);
+ if (directory == NULL) {
+ char *path;
+
+ if (directory_is_root(parent))
+ path = NULL;
+ else
+ name = path = g_strconcat(directory_get_path(parent),
+ "/", name, NULL);
+
+ directory = directory_new_child(parent, name);
+ g_free(path);
+ }
+
+ return directory;
+}
+
+#ifdef ENABLE_ARCHIVE
+static void
+update_archive_tree(struct directory *directory, char *name)
+{
+ struct directory *subdir;
+ struct song *song;
+ char *tmp;
+
+ tmp = strchr(name, '/');
+ if (tmp) {
+ *tmp = 0;
+ //add dir is not there already
+ if ((subdir = dirvec_find(&directory->children, name)) == NULL) {
+ //create new directory
+ subdir = make_subdir(directory, name);
+ subdir->device = DEVICE_INARCHIVE;
+ }
+ //create directories first
+ update_archive_tree(subdir, tmp+1);
+ } else {
+ if (strlen(name) == 0) {
+ g_warning("archive returned directory only");
+ return;
+ }
+ //add file
+ song = songvec_find(&directory->songs, name);
+ if (song == NULL) {
+ song = song_file_load(name, directory);
+ if (song != NULL) {
+ songvec_add(&directory->songs, song);
+ modified = true;
+ g_message("added %s/%s",
+ directory_get_path(directory), name);
+ }
+ }
+ }
+}
+
+/**
+ * Updates the file listing from an archive file.
+ *
+ * @param parent the parent directory the archive file resides in
+ * @param name the UTF-8 encoded base name of the archive file
+ * @param st stat() information on the archive file
+ * @param plugin the archive plugin which fits this archive type
+ */
+static void
+update_archive_file(struct directory *parent, const char *name,
+ const struct stat *st,
+ const struct archive_plugin *plugin)
+{
+ char *path_fs;
+ struct archive_file *file;
+ struct directory *directory;
+ char *filepath;
+
+ directory = dirvec_find(&parent->children, name);
+ if (directory != NULL && directory->mtime == st->st_mtime &&
+ !walk_discard)
+ /* MPD has already scanned the archive, and it hasn't
+ changed since - don't consider updating it */
+ return;
+
+ path_fs = map_directory_child_fs(parent, name);
+
+ /* open archive */
+ file = plugin->open(path_fs);
+ if (file == NULL) {
+ g_warning("unable to open archive %s", path_fs);
+ g_free(path_fs);
+ return;
+ }
+
+ g_debug("archive %s opened", path_fs);
+ g_free(path_fs);
+
+ if (directory == NULL) {
+ g_debug("creating archive directory: %s", name);
+ directory = make_subdir(parent, name);
+ /* mark this directory as archive (we use device for
+ this) */
+ directory->device = DEVICE_INARCHIVE;
+ }
+
+ directory->mtime = st->st_mtime;
+
+ plugin->scan_reset(file);
+
+ while ((filepath = plugin->scan_next(file)) != NULL) {
+ /* split name into directory and file */
+ g_debug("adding archive file: %s", filepath);
+ update_archive_tree(directory, filepath);
+ }
+
+ plugin->close(file);
+}
+#endif
+
+static bool
+update_container_file( struct directory* directory,
+ const char* name,
+ const struct stat* st,
+ const struct decoder_plugin* plugin)
+{
+ char* vtrack = NULL;
+ unsigned int tnum = 0;
+ char* pathname = map_directory_child_fs(directory, name);
+ struct directory* contdir = dirvec_find(&directory->children, name);
+
+ // directory exists already
+ if (contdir != NULL)
+ {
+ // modification time not eq. file mod. time
+ if (contdir->mtime != st->st_mtime || walk_discard)
+ {
+ g_message("removing container file: %s", pathname);
+
+ delete_directory(contdir);
+ contdir = NULL;
+
+ modified = true;
+ }
+ else {
+ g_free(pathname);
+ return true;
+ }
+ }
+
+ contdir = make_subdir(directory, name);
+ contdir->mtime = st->st_mtime;
+ contdir->device = DEVICE_CONTAINER;
+
+ while ((vtrack = plugin->container_scan(pathname, ++tnum)) != NULL)
+ {
+ struct song* song = song_file_new(vtrack, contdir);
+ if (song == NULL)
+ return true;
+
+ // shouldn't be necessary but it's there..
+ song->mtime = st->st_mtime;
+
+ song->tag = plugin->tag_dup(map_directory_child_fs(contdir, vtrack));
+
+ songvec_add(&contdir->songs, song);
+ song = NULL;
+
+ modified = true;
+
+ g_free(vtrack);
+ }
+
+ g_free(pathname);
+
+ if (tnum == 1)
+ {
+ delete_directory(contdir);
+ return false;
+ }
+ else
+ return true;
+}
+
+static void
+update_regular_file(struct directory *directory,
+ const char *name, const struct stat *st)
+{
+ const char *suffix = uri_get_suffix(name);
+ const struct decoder_plugin* plugin;
+#ifdef ENABLE_ARCHIVE
+ const struct archive_plugin *archive;
+#endif
+ if (suffix == NULL)
+ return;
+
+ if ((plugin = decoder_plugin_from_suffix(suffix, false)) != NULL)
+ {
+ struct song* song = songvec_find(&directory->songs, name);
+
+ if (!(song != NULL && st->st_mtime == song->mtime &&
+ !walk_discard) &&
+ plugin->container_scan != NULL)
+ {
+ if (update_container_file(directory, name, st, plugin))
+ {
+ if (song != NULL)
+ delete_song(directory, song);
+
+ return;
+ }
+ }
+
+ if (song == NULL) {
+ song = song_file_load(name, directory);
+ if (song == NULL)
+ return;
+
+ songvec_add(&directory->songs, song);
+ modified = true;
+ g_message("added %s/%s",
+ directory_get_path(directory), name);
+ } else if (st->st_mtime != song->mtime || walk_discard) {
+ g_message("updating %s/%s",
+ directory_get_path(directory), name);
+ if (!song_file_update(song))
+ delete_song(directory, song);
+ modified = true;
+ }
+#ifdef ENABLE_ARCHIVE
+ } else if ((archive = archive_plugin_from_suffix(suffix))) {
+ update_archive_file(directory, name, st, archive);
+#endif
+ }
+}
+
+static bool
+updateDirectory(struct directory *directory, const struct stat *st);
+
+static void
+updateInDirectory(struct directory *directory,
+ const char *name, const struct stat *st)
+{
+ assert(strchr(name, '/') == NULL);
+
+ if (S_ISREG(st->st_mode)) {
+ update_regular_file(directory, name, st);
+ } else if (S_ISDIR(st->st_mode)) {
+ struct directory *subdir;
+ bool ret;
+
+ if (inodeFoundInParent(directory, st->st_ino, st->st_dev))
+ return;
+
+ subdir = make_subdir(directory, name);
+ assert(directory == subdir->parent);
+
+ ret = updateDirectory(subdir, st);
+ if (!ret)
+ delete_directory(subdir);
+ } else {
+ g_debug("update: %s is not a directory, archive or music", name);
+ }
+}
+
+/* we don't look at "." / ".." nor files with newlines in their name */
+static bool skip_path(const char *path)
+{
+ return (path[0] == '.' && path[1] == 0) ||
+ (path[0] == '.' && path[1] == '.' && path[2] == 0) ||
+ strchr(path, '\n') != NULL;
+}
+
+static bool
+skip_symlink(const struct directory *directory, const char *utf8_name)
+{
+#ifndef WIN32
+ char buffer[MPD_PATH_MAX];
+ char *path_fs;
+ const char *p;
+ ssize_t ret;
+
+ path_fs = map_directory_child_fs(directory, utf8_name);
+ if (path_fs == NULL)
+ return true;
+
+ ret = readlink(path_fs, buffer, sizeof(buffer));
+ g_free(path_fs);
+ if (ret < 0)
+ /* don't skip if this is not a symlink */
+ return errno != EINVAL;
+
+ if (!follow_inside_symlinks && !follow_outside_symlinks) {
+ /* ignore all symlinks */
+ return true;
+ } else if (follow_inside_symlinks && follow_outside_symlinks) {
+ /* consider all symlinks */
+ return false;
+ }
+
+ if (buffer[0] == '/')
+ return !follow_outside_symlinks;
+
+ p = buffer;
+ while (*p == '.') {
+ if (p[1] == '.' && p[2] == '/') {
+ /* "../" moves to parent directory */
+ directory = directory->parent;
+ if (directory == NULL) {
+ /* we have moved outside the music
+ directory - skip this symlink
+ if such symlinks are not allowed */
+ return !follow_outside_symlinks;
+ }
+ p += 3;
+ } else if (p[1] == '/')
+ /* eliminate "./" */
+ p += 2;
+ else
+ break;
+ }
+
+ /* we are still in the music directory, so this symlink points
+ to a song which is already in the database - skip according
+ to the follow_inside_symlinks param*/
+ return !follow_inside_symlinks;
+#else
+ /* no symlink checking on WIN32 */
+
+ (void)directory;
+ (void)utf8_name;
+
+ return false;
+#endif
+}
+
+static bool
+updateDirectory(struct directory *directory, const struct stat *st)
+{
+ DIR *dir;
+ struct dirent *ent;
+ char *path_fs;
+
+ assert(S_ISDIR(st->st_mode));
+
+ directory_set_stat(directory, st);
+
+ path_fs = map_directory_fs(directory);
+ if (path_fs == NULL)
+ return false;
+
+ dir = opendir(path_fs);
+ if (!dir) {
+ g_warning("Failed to open directory %s: %s",
+ path_fs, g_strerror(errno));
+ g_free(path_fs);
+ return false;
+ }
+
+ g_free(path_fs);
+
+ removeDeletedFromDirectory(directory);
+
+ while ((ent = readdir(dir))) {
+ char *utf8;
+ struct stat st2;
+
+ if (skip_path(ent->d_name))
+ continue;
+
+ utf8 = fs_charset_to_utf8(ent->d_name);
+ if (utf8 == NULL || skip_symlink(directory, utf8)) {
+ g_free(utf8);
+ continue;
+ }
+
+ if (stat_directory_child(directory, utf8, &st2) == 0)
+ updateInDirectory(directory, utf8, &st2);
+ else
+ delete_name_in(directory, utf8);
+
+ g_free(utf8);
+ }
+
+ closedir(dir);
+
+ directory->mtime = st->st_mtime;
+
+ return true;
+}
+
+static struct directory *
+directory_make_child_checked(struct directory *parent, const char *path)
+{
+ struct directory *directory;
+ char *base;
+ struct stat st;
+ struct song *conflicting;
+
+ directory = directory_get_child(parent, path);
+ if (directory != NULL)
+ return directory;
+
+ base = g_path_get_basename(path);
+
+ if (stat_directory_child(parent, base, &st) < 0 ||
+ inodeFoundInParent(parent, st.st_ino, st.st_dev)) {
+ g_free(base);
+ return NULL;
+ }
+
+ /* if we're adding directory paths, make sure to delete filenames
+ with potentially the same name */
+ conflicting = songvec_find(&parent->songs, base);
+ if (conflicting)
+ delete_song(parent, conflicting);
+
+ g_free(base);
+
+ directory = directory_new_child(parent, path);
+ directory_set_stat(directory, &st);
+ return directory;
+}
+
+static struct directory *
+addParentPathToDB(const char *utf8path)
+{
+ struct directory *directory = db_get_root();
+ char *duplicated = g_strdup(utf8path);
+ char *slash = duplicated;
+
+ while ((slash = strchr(slash, '/')) != NULL) {
+ *slash = 0;
+
+ directory = directory_make_child_checked(directory,
+ duplicated);
+ if (directory == NULL || slash == NULL)
+ break;
+
+ *slash++ = '/';
+ }
+
+ g_free(duplicated);
+ return directory;
+}
+
+static void
+updatePath(const char *path)
+{
+ struct directory *parent;
+ char *name;
+ struct stat st;
+
+ parent = addParentPathToDB(path);
+ if (parent == NULL)
+ return;
+
+ name = g_path_get_basename(path);
+
+ if (stat_directory_child(parent, name, &st) == 0)
+ updateInDirectory(parent, name, &st);
+ else
+ delete_name_in(parent, name);
+
+ g_free(name);
+}
+
+bool
+update_walk(const char *path, bool discard)
+{
+ walk_discard = discard;
+ modified = false;
+
+ if (path != NULL && !isRootDirectory(path)) {
+ updatePath(path);
+ } else {
+ struct directory *directory = db_get_root();
+ struct stat st;
+
+ if (stat_directory(directory, &st) == 0)
+ updateDirectory(directory, &st);
+ }
+
+ return modified;
+}