updated build system

rpmsign.exp

@@ -0,0 +1,14 @@
+#!/usr/bin/expect -f
+
+set key [lindex $argv 0]
+set password [lindex $argv 1]
+set files [lrange $argv 2 end]
+
+### rpm-sign.exp -- Sign RPMs by sending the passphrase.
+spawn rpmsign --define "_gpg_name $key" --addsign {*}$files
+expect {
+    "Enter pass phrase: " {
+        send -- "$password\r"
+        exp_continue
+    } eof
+}