+# Determine on which keyring we want to work
+if [ "$1" = "--keyring" ]; then
+ #echo "keyfile given"
+ shift
+ TRUSTEDFILE="$1"
+ if [ -r "$TRUSTEDFILE" ]; then
+ GPG="$GPG --keyring $TRUSTEDFILE --primary-keyring $TRUSTEDFILE"
+ else
+ echo >&2 "Error: The specified keyring »$TRUSTEDFILE« is missing or not readable"
+ exit 1
+ fi
+ shift
+# otherwise use the default
+else
+ #echo "generate list"
+ TRUSTEDFILE="/etc/apt/trusted.gpg"
+ eval $(apt-config shell TRUSTEDFILE Apt::GPGV::TrustedKeyring)
+ if [ -r "$TRUSTEDFILE" ]; then
+ GPG="$GPG --keyring $TRUSTEDFILE"
+ fi
+ GPG="$GPG --primary-keyring $TRUSTEDFILE"
+ TRUSTEDPARTS="/etc/apt/trusted.gpg.d"
+ if [ -d "$TRUSTEDPARTS" ]; then
+ #echo "parts active"
+ for trusted in $(run-parts --list $TRUSTEDPARTS --regex '^.*\.gpg$'); do
+ #echo "part -> $trusted"
+ GPG="$GPG --keyring $trusted"
+ done
+ fi
+fi
+#echo "COMMAND: $GPG"
+