diff options
Diffstat (limited to 'src/db/update/UpdateWalk.cxx')
| -rw-r--r-- | src/db/update/UpdateWalk.cxx | 484 |
1 files changed, 484 insertions, 0 deletions
diff --git a/src/db/update/UpdateWalk.cxx b/src/db/update/UpdateWalk.cxx new file mode 100644 index 000000000..c5a9936e9 --- /dev/null +++ b/src/db/update/UpdateWalk.cxx @@ -0,0 +1,484 @@ +/* + * 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 "UpdateWalk.hxx" +#include "UpdateIO.hxx" +#include "UpdateDatabase.hxx" +#include "UpdateSong.hxx" +#include "UpdateArchive.hxx" +#include "UpdateDomain.hxx" +#include "db/DatabaseLock.hxx" +#include "db/DatabaseSimple.hxx" +#include "db/Directory.hxx" +#include "db/Song.hxx" +#include "PlaylistVector.hxx" +#include "playlist/PlaylistRegistry.hxx" +#include "Mapper.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/DirectoryReader.hxx" +#include "util/Alloc.hxx" +#include "util/UriUtil.hxx" +#include "Log.hxx" + +#include <assert.h> +#include <sys/stat.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> + +bool walk_discard; +bool modified; + +#ifndef WIN32 + +static constexpr bool DEFAULT_FOLLOW_INSIDE_SYMLINKS = true; +static constexpr bool 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(Directory &dir, const struct stat *st) +{ + dir.inode = st->st_ino; + dir.device = st->st_dev; + dir.have_stat = true; +} + +static void +remove_excluded_from_directory(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)) { + delete_directory(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)) { + delete_song(directory, song); + modified = true; + } + } + + db_unlock(); +} + +static void +purge_deleted_from_directory(Directory &directory) +{ + Directory *child, *n; + directory_for_each_child_safe(child, n, directory) { + if (directory_exists(*child)) + continue; + + db_lock(); + delete_directory(child); + db_unlock(); + + modified = true; + } + + Song *song, *ns; + directory_for_each_song_safe(song, ns, directory) { + const auto path = map_song_fs(*song); + if (path.IsNull() || !FileExists(path)) { + db_lock(); + delete_song(directory, song); + db_unlock(); + + modified = true; + } + } + + for (auto i = directory.playlists.begin(), + end = directory.playlists.end(); + i != end;) { + if (!directory_child_is_regular(directory, i->name.c_str())) { + db_lock(); + i = directory.playlists.erase(i); + db_unlock(); + } else + ++i; + } +} + +#ifndef WIN32 +static int +update_directory_stat(Directory &directory) +{ + struct stat st; + if (stat_directory(directory, &st) < 0) + return -1; + + directory_set_stat(directory, &st); + return 0; +} +#endif + +static int +find_inode_ancestor(Directory *parent, ino_t inode, dev_t device) +{ +#ifndef WIN32 + while (parent) { + if (!parent->have_stat && update_directory_stat(*parent) < 0) + return -1; + + if (parent->inode == inode && parent->device == device) { + LogDebug(update_domain, "recursive directory found"); + return 1; + } + + parent = parent->parent; + } +#else + (void)parent; + (void)inode; + (void)device; +#endif + + return 0; +} + +static bool +update_playlist_file2(Directory &directory, + const char *name, const char *suffix, + const struct stat *st) +{ + if (!playlist_suffix_supported(suffix)) + return false; + + PlaylistInfo pi(name, st->st_mtime); + + db_lock(); + if (directory.playlists.UpdateOrInsert(std::move(pi))) + modified = true; + db_unlock(); + return true; +} + +static bool +update_regular_file(Directory &directory, + const char *name, const struct stat *st) +{ + const char *suffix = uri_get_suffix(name); + if (suffix == nullptr) + return false; + + return update_song_file(directory, name, suffix, st) || + update_archive_file(directory, name, suffix, st) || + update_playlist_file2(directory, name, suffix, st); +} + +static bool +update_directory(Directory &directory, const struct stat *st); + +static void +update_directory_child(Directory &directory, + const char *name, const struct stat *st) +{ + assert(strchr(name, '/') == nullptr); + + if (S_ISREG(st->st_mode)) { + update_regular_file(directory, name, st); + } else if (S_ISDIR(st->st_mode)) { + if (find_inode_ancestor(&directory, st->st_ino, st->st_dev)) + return; + + db_lock(); + Directory *subdir = directory.MakeChild(name); + db_unlock(); + + assert(&directory == subdir->parent); + + if (!update_directory(*subdir, st)) { + db_lock(); + delete_directory(subdir); + db_unlock(); + } + } 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(Path path_fs) +{ + const char *path = path_fs.c_str(); + return (path[0] == '.' && path[1] == 0) || + (path[0] == '.' && path[1] == '.' && path[2] == 0) || + strchr(path, '\n') != nullptr; +} + +gcc_pure +static bool +skip_symlink(const Directory *directory, const char *utf8_name) +{ +#ifndef WIN32 + const auto path_fs = map_directory_child_fs(*directory, utf8_name); + if (path_fs.IsNull()) + return true; + + 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 char *relative = map_to_relative_path(target_str); + return relative > target_str + ? !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 +} + +static bool +update_directory(Directory &directory, const struct stat *st) +{ + assert(S_ISDIR(st->st_mode)); + + directory_set_stat(directory, st); + + const auto path_fs = map_directory_fs(directory); + if (path_fs.IsNull()) + return false; + + DirectoryReader reader(path_fs); + if (reader.HasFailed()) { + int error = errno; + const auto path_utf8 = path_fs.ToUTF8(); + FormatErrno(update_domain, error, + "Failed to open directory %s", + path_utf8.c_str()); + return false; + } + + ExcludeList exclude_list; + exclude_list.LoadFile(AllocatedPath::Build(path_fs, ".mpdignore")); + + if (!exclude_list.IsEmpty()) + remove_excluded_from_directory(directory, exclude_list); + + purge_deleted_from_directory(directory); + + while (reader.ReadEntry()) { + std::string utf8; + struct stat st2; + + const auto entry = reader.GetEntry(); + + if (skip_path(entry) || exclude_list.Check(entry)) + continue; + + utf8 = entry.ToUTF8(); + if (utf8.empty()) + continue; + + if (skip_symlink(&directory, utf8.c_str())) { + modified |= delete_name_in(directory, utf8.c_str()); + continue; + } + + if (stat_directory_child(directory, utf8.c_str(), &st2) == 0) + update_directory_child(directory, utf8.c_str(), &st2); + else + modified |= delete_name_in(directory, utf8.c_str()); + } + + directory.mtime = st->st_mtime; + + return true; +} + +static Directory * +directory_make_child_checked(Directory &parent, const char *name_utf8) +{ + db_lock(); + Directory *directory = parent.FindChild(name_utf8); + db_unlock(); + + if (directory != nullptr) + return directory; + + struct stat st; + if (stat_directory_child(parent, name_utf8, &st) < 0 || + find_inode_ancestor(&parent, st.st_ino, st.st_dev)) + return nullptr; + + if (skip_symlink(&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) + delete_song(parent, conflicting); + + directory = parent.CreateChild(name_utf8); + db_unlock(); + + directory_set_stat(*directory, &st); + return directory; +} + +static Directory * +directory_make_uri_parent_checked(const char *uri) +{ + Directory *directory = db_get_root(); + char *duplicated = xstrdup(uri); + char *name_utf8 = duplicated, *slash; + + while ((slash = strchr(name_utf8, '/')) != nullptr) { + *slash = 0; + + if (*name_utf8 == 0) + continue; + + directory = directory_make_child_checked(*directory, + name_utf8); + if (directory == nullptr) + break; + + name_utf8 = slash + 1; + } + + free(duplicated); + return directory; +} + +static void +update_uri(const char *uri) +{ + Directory *parent = directory_make_uri_parent_checked(uri); + if (parent == nullptr) + return; + + const char *name = PathTraitsUTF8::GetBase(uri); + + struct stat st; + if (!skip_symlink(parent, name) && + stat_directory_child(*parent, name, &st) == 0) + update_directory_child(*parent, name, &st); + else + modified |= delete_name_in(*parent, name); +} + +bool +update_walk(const char *path, bool discard) +{ + walk_discard = discard; + modified = false; + + if (path != nullptr && !isRootDirectory(path)) { + update_uri(path); + } else { + Directory *directory = db_get_root(); + struct stat st; + + if (stat_directory(*directory, &st) == 0) + update_directory(*directory, &st); + } + + return modified; +} |