NixOS/nixpkgs — pull request #2990 by third3ye (2014-06-17 03:24:46+00:00)
Title: Minor logic fix

music_directory "${cfg.musicDirectory}"
playlist_directory "${cfg.dataDir}/playlists"
db_file "${cfg.dataDir}/tag_cache"
state_file "${cfg.dataDir}/state"
sticker_file "${cfg.dataDir}/sticker.sql"

all refer to ${cfg.datadir}, which by default is "/var/lib/mpd/".

Parsing for instance ${cfg.datadir}/playlists results in:
/var/lib/mpd//playlists - NOT FOUND.