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Diffstat (limited to 'src/db/update/Walk.cxx')
| -rw-r--r-- | src/db/update/Walk.cxx | 495 |
1 files changed, 495 insertions, 0 deletions
diff --git a/src/db/update/Walk.cxx b/src/db/update/Walk.cxx new file mode 100644 index 000000000..c329865ff --- /dev/null +++ b/src/db/update/Walk.cxx @@ -0,0 +1,495 @@ +/* + * Copyright (C) 2003-2014 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 "config.h" /* must be first for large file support */ +#include "Walk.hxx" +#include "UpdateIO.hxx" +#include "Editor.hxx" +#include "UpdateDomain.hxx" +#include "db/DatabaseLock.hxx" +#include "db/PlaylistVector.hxx" +#include "db/Uri.hxx" +#include "db/plugins/simple/Directory.hxx" +#include "db/plugins/simple/Song.hxx" +#include "storage/StorageInterface.hxx" +#include "playlist/PlaylistRegistry.hxx" +#include "ExcludeList.hxx" +#include "config/ConfigGlobal.hxx" +#include "config/ConfigOption.hxx" +#include "fs/AllocatedPath.hxx" +#include "fs/Traits.hxx" +#include "fs/FileSystem.hxx" +#include "fs/Charset.hxx" +#include "storage/FileInfo.hxx" +#include "util/Alloc.hxx" +#include "util/UriUtil.hxx" +#include "util/Error.hxx" +#include "Log.hxx" + +#include <assert.h> +#include <sys/stat.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <memory> + +UpdateWalk::UpdateWalk(EventLoop &_loop, DatabaseListener &_listener, + Storage &_storage) + :cancel(false), + storage(_storage), + editor(_loop, _listener) +{ +#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 +} + +static void +directory_set_stat(Directory &dir, const FileInfo &info) +{ + dir.inode = info.inode; + dir.device = info.device; + dir.have_stat = true; +} + +inline void +UpdateWalk::RemoveExcludedFromDirectory(Directory &directory, + const ExcludeList &exclude_list) +{ + db_lock(); + + Directory *child, *n; + directory_for_each_child_safe(child, n, directory) { + const auto name_fs = AllocatedPath::FromUTF8(child->GetName()); + + if (name_fs.IsNull() || exclude_list.Check(name_fs)) { + editor.DeleteDirectory(child); + modified = true; + } + } + + Song *song, *ns; + directory_for_each_song_safe(song, ns, directory) { + assert(song->parent == &directory); + + const auto name_fs = AllocatedPath::FromUTF8(song->uri); + if (name_fs.IsNull() || exclude_list.Check(name_fs)) { + editor.DeleteSong(directory, song); + modified = true; + } + } + + db_unlock(); +} + +inline void +UpdateWalk::PurgeDeletedFromDirectory(Directory &directory) +{ + Directory *child, *n; + directory_for_each_child_safe(child, n, directory) { + if (DirectoryExists(storage, *child)) + continue; + + editor.LockDeleteDirectory(child); + + modified = true; + } + + Song *song, *ns; + directory_for_each_song_safe(song, ns, directory) { + if (!directory_child_is_regular(storage, directory, + song->uri)) { + editor.LockDeleteSong(directory, song); + + modified = true; + } + } + + for (auto i = directory.playlists.begin(), + end = directory.playlists.end(); + i != end;) { + if (!directory_child_is_regular(storage, directory, + i->name.c_str())) { + db_lock(); + i = directory.playlists.erase(i); + db_unlock(); + } else + ++i; + } +} + +#ifndef WIN32 +static bool +update_directory_stat(Storage &storage, Directory &directory) +{ + FileInfo info; + if (!GetInfo(storage, directory.GetPath(), info)) + return false; + + directory_set_stat(directory, info); + return true; +} +#endif + +/** + * Check the ancestors of the given #Directory and see if there's one + * with the same device/inode number, building a loop. + * + * @return 1 if a loop was found, 0 if not, -1 on I/O error + */ +static int +FindAncestorLoop(Storage &storage, Directory *parent, + unsigned inode, unsigned device) +{ +#ifndef WIN32 + if (device == 0 && inode == 0) + /* can't detect loops if the Storage does not support + these numbers */ + return 0; + + while (parent) { + if (!parent->have_stat && + !update_directory_stat(storage, *parent)) + return -1; + + if (parent->inode == inode && parent->device == device) { + LogDebug(update_domain, "recursive directory found"); + return 1; + } + + parent = parent->parent; + } +#else + (void)storage; + (void)parent; + (void)inode; + (void)device; +#endif + + return 0; +} + +inline bool +UpdateWalk::UpdatePlaylistFile(Directory &directory, + const char *name, const char *suffix, + const FileInfo &info) +{ + if (!playlist_suffix_supported(suffix)) + return false; + + PlaylistInfo pi(name, info.mtime); + + db_lock(); + if (directory.playlists.UpdateOrInsert(std::move(pi))) + modified = true; + db_unlock(); + return true; +} + +inline bool +UpdateWalk::UpdateRegularFile(Directory &directory, + const char *name, const FileInfo &info) +{ + const char *suffix = uri_get_suffix(name); + if (suffix == nullptr) + return false; + + return UpdateSongFile(directory, name, suffix, info) || + UpdateArchiveFile(directory, name, suffix, info) || + UpdatePlaylistFile(directory, name, suffix, info); +} + +void +UpdateWalk::UpdateDirectoryChild(Directory &directory, + const char *name, const FileInfo &info) +{ + assert(strchr(name, '/') == nullptr); + + if (info.IsRegular()) { + UpdateRegularFile(directory, name, info); + } else if (info.IsDirectory()) { + if (FindAncestorLoop(storage, &directory, + info.inode, info.device)) + return; + + db_lock(); + Directory *subdir = directory.MakeChild(name); + db_unlock(); + + assert(&directory == subdir->parent); + + if (!UpdateDirectory(*subdir, info)) + editor.LockDeleteDirectory(subdir); + } else { + FormatDebug(update_domain, + "%s is not a directory, archive or music", name); + } +} + +/* we don't look at "." / ".." nor files with newlines in their name */ +gcc_pure +static bool +skip_path(const char *name_utf8) +{ + return strchr(name_utf8, '\n') != nullptr; +} + +gcc_pure +bool +UpdateWalk::SkipSymlink(const Directory *directory, + const char *utf8_name) const +{ +#ifndef WIN32 + const auto path_fs = storage.MapChildFS(directory->GetPath(), + utf8_name); + if (path_fs.IsNull()) + /* not a local file: don't skip */ + return false; + + const auto target = ReadLink(path_fs); + if (target.IsNull()) + /* 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; + } + + const char *target_str = target.c_str(); + + if (PathTraitsFS::IsAbsolute(target_str)) { + /* if the symlink points to an absolute path, see if + that path is inside the music directory */ + const auto target_utf8 = PathToUTF8(target_str); + if (target_utf8.empty()) + return true; + + const char *relative = + storage.MapToRelativeUTF8(target_utf8.c_str()); + return relative != nullptr + ? !follow_inside_symlinks + : !follow_outside_symlinks; + } + + const char *p = target_str; + while (*p == '.') { + if (p[1] == '.' && PathTraitsFS::IsSeparator(p[2])) { + /* "../" moves to parent directory */ + directory = directory->parent; + if (directory == nullptr) { + /* we have moved outside the music + directory - skip this symlink + if such symlinks are not allowed */ + return !follow_outside_symlinks; + } + p += 3; + } else if (PathTraitsFS::IsSeparator(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 +} + +bool +UpdateWalk::UpdateDirectory(Directory &directory, const FileInfo &info) +{ + assert(info.IsDirectory()); + + directory_set_stat(directory, info); + + Error error; + const std::auto_ptr<StorageDirectoryReader> reader(storage.OpenDirectory(directory.GetPath(), error)); + if (reader.get() == nullptr) { + LogError(error); + return false; + } + + ExcludeList exclude_list; + + { + const auto exclude_path_fs = + storage.MapChildFS(directory.GetPath(), ".mpdignore"); + if (!exclude_path_fs.IsNull()) + exclude_list.LoadFile(exclude_path_fs); + } + + if (!exclude_list.IsEmpty()) + RemoveExcludedFromDirectory(directory, exclude_list); + + PurgeDeletedFromDirectory(directory); + + const char *name_utf8; + while (!cancel && (name_utf8 = reader->Read()) != nullptr) { + if (skip_path(name_utf8)) + continue; + + { + const auto name_fs = AllocatedPath::FromUTF8(name_utf8); + if (name_fs.IsNull() || exclude_list.Check(name_fs)) + continue; + } + + if (SkipSymlink(&directory, name_utf8)) { + modified |= editor.DeleteNameIn(directory, name_utf8); + continue; + } + + FileInfo info2; + if (!GetInfo(*reader, info2)) { + modified |= editor.DeleteNameIn(directory, name_utf8); + continue; + } + + UpdateDirectoryChild(directory, name_utf8, info2); + } + + directory.mtime = info.mtime; + + return true; +} + +inline Directory * +UpdateWalk::DirectoryMakeChildChecked(Directory &parent, + const char *uri_utf8, + const char *name_utf8) +{ + db_lock(); + Directory *directory = parent.FindChild(name_utf8); + db_unlock(); + + if (directory != nullptr) { + if (directory->IsMount()) + directory = nullptr; + + return directory; + } + + FileInfo info; + if (!GetInfo(storage, uri_utf8, info) || + FindAncestorLoop(storage, &parent, info.inode, info.device)) + return nullptr; + + if (SkipSymlink(&parent, name_utf8)) + return nullptr; + + /* if we're adding directory paths, make sure to delete filenames + with potentially the same name */ + db_lock(); + Song *conflicting = parent.FindSong(name_utf8); + if (conflicting) + editor.DeleteSong(parent, conflicting); + + directory = parent.CreateChild(name_utf8); + db_unlock(); + + directory_set_stat(*directory, info); + return directory; +} + +inline Directory * +UpdateWalk::DirectoryMakeUriParentChecked(Directory &root, const char *uri) +{ + Directory *directory = &root; + char *duplicated = xstrdup(uri); + char *name_utf8 = duplicated, *slash; + + while ((slash = strchr(name_utf8, '/')) != nullptr) { + *slash = 0; + + if (*name_utf8 == 0) + continue; + + directory = DirectoryMakeChildChecked(*directory, + duplicated, + name_utf8); + if (directory == nullptr) + break; + + name_utf8 = slash + 1; + } + + free(duplicated); + return directory; +} + +inline void +UpdateWalk::UpdateUri(Directory &root, const char *uri) +{ + Directory *parent = DirectoryMakeUriParentChecked(root, uri); + if (parent == nullptr) + return; + + const char *name = PathTraitsUTF8::GetBase(uri); + + if (SkipSymlink(parent, name)) { + modified |= editor.DeleteNameIn(*parent, name); + return; + } + + FileInfo info; + if (!GetInfo(storage, uri, info)) { + modified |= editor.DeleteNameIn(*parent, name); + return; + } + + UpdateDirectoryChild(*parent, name, info); +} + +bool +UpdateWalk::Walk(Directory &root, const char *path, bool discard) +{ + walk_discard = discard; + modified = false; + + if (path != nullptr && !isRootDirectory(path)) { + UpdateUri(root, path); + } else { + FileInfo info; + if (!GetInfo(storage, "", info)) + return false; + + UpdateDirectory(root, info); + } + + return modified; +} |