Add separate GnuPG home for aur.sh

etc/aur.conf

@@ -10,3 +10,22 @@ test -d "$AURDEST" || mkdir -p "$AURDEST" || exit 1
 test -d "$PKGDEST" || mkdir -p "$PKGDEST" || exit 1
 test -d "$SRCDEST" || mkdir -p "$SRCDEST" || exit 1
 
+# GnuPG Signatures
+export GNUPGHOME="$AURDIR/gnupg"
+
+test -d "$GNUPGHOME" || mkdir -p "$GNUPGHOME" && chmod go-w "$GNUPGHOME" || exit 1
+test -e "$GNUPGHOME/gpg.conf" || cat >"$GNUPGHOME/gpg.conf" <<EOF
+no-greeting
+keyserver hkp://pool.sks-keyservers.net
+keyserver-options auto-key-retrieve
+personal-cipher-preferences AES256 AES192 AES
+personal-digest-preferences SHA512 SHA384 SHA256
+cert-digest-algo SHA512
+EOF
+if [ "$?" -eq 0 ]; then
+    dirmngr </dev/null || exit 1
+else
+    echo "Failed to initialize aur.sh GnuPG keyring"
+    exit 1
+fi
+