+ $pin_release_array = [
+ $release,
+ $codename,
+ $release_version,
+ $component,
+ $originator,
+ $label]
+ $pin_release = join($pin_release_array, '')
+
+ # Read the manpage 'apt_preferences(5)', especially the chapter
+ # 'Thea Effect of APT Preferences' to understand the following logic
+ # and the difference between specific and general form
+ if $packages != '*' { # specific form
+
+ if ( $pin_release != '' and ( $origin != '' or $version != '' )) or
+ ( $origin != '' and ( $pin_release != '' or $version != '' )) or
+ ( $version != '' and ( $pin_release != '' or $origin != '' )) {
+ fail('parameters release, origin, and version are mutually exclusive')
+ }
+
+ } else { # general form
+
+ if $version != '' {
+ fail('parameter version cannot be used in general form')
+ }
+
+ if ( $pin_release != '' and $origin != '' ) or
+ ( $origin != '' and $pin_release != '' ) {
+ fail('parmeters release and origin are mutually exclusive')
+ }
+
+ }
+
+ $path = $order ? {
+ '' => "${preferences_d}/${name}.pref",
+ default => "${preferences_d}/${order}-${name}.pref",
+ }