+
+ if $packages_string != '*' { # specific form
+ if ( $pin_release != '' and ( $origin != '' 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 != '' ) {
+ fail('parameters release and origin are mutually exclusive')
+ }
+ }
+
+ # According to man 5 apt_preferences:
+ # The files have either no or "pref" as filename extension
+ # and only contain alphanumeric, hyphen (-), underscore (_) and period
+ # (.) characters. Otherwise APT will print a notice that it has ignored a
+ # file, unless that file matches a pattern in the
+ # Dir::Ignore-Files-Silently configuration list - in which case it will
+ # be silently ignored.
+ $file_name = regsubst($title, '[^0-9a-z\-_\.]', '_', 'IG')
+
+ apt::setting { "pref-${file_name}":
+ ensure => $ensure,
+ priority => $order,
+ content => template('apt/_header.erb', 'apt/pin.pref.erb'),
+ notify_update => false,