abuild-keygen: implement -n for non-interactive mode

abuild-keygen.in

@@ -15,6 +15,19 @@ abuild_conf=${ABUILD_CONF:-"$sysconfdir/abuild.conf"}
 abuild_home=${ABUILD_USERDIR:-"$HOME/.abuild"}
 abuild_userconf=${ABUILD_USERCONF:-"$abuild_home/abuild.conf"}
 
+# ask for privkey unless non-interactive mode
+# returns value in global $privkey
+get_privkey_file() {
+	privkey="$abuild_home/$default_name.rsa"
+	[ "$non_interactive" = "yes" ] && return 0
+	echo "Generating public/private rsa key pair for abuild"
+	echo -n "Enter file in which to save the key ($abuild_home/$default_name.rsa): "
+
+	read line
+	if [ -n "$line" ]; then
+		privkey="$line"
+	fi
+}
 
 usage() {
 	echo "abuild-keygen $abuild_ver"
@@ -23,6 +36,7 @@ usage() {
 	echo " -a  Set PACKAGER_PRIVKEY=<generated key> in $abuild_userconf"
 	echo " -i  Install public key into /etc/apk/keys using sudo"
 	echo " -h  Show this help"
+	echo " -n  Non-interactive. Use defaults"
 	echo ""
 	exit 1
 }
@@ -47,26 +61,19 @@ else
 	default_name="$USER-$(printf "%x" $(date +%s))"
 fi
 
-while getopts "ahi" opt; do
+while getopts "ahin" opt; do
 	case $opt in
 	a) append_config=yes;;
 	h) usage;;
-	i) install_pubkey=yes;
+	i) install_pubkey=yes;;
+	n) non_interactive=yes;;
 	esac
 done
 shift $(( $OPTIND - 1))
 
 mkdir -p "$abuild_home"
 
-echo "Generating public/private rsa key pair for abuild"
-echo -n "Enter file in which to save the key ($abuild_home/$default_name.rsa): "
-
-read line
-if [ -z "$line" ]; then
-	privkey="$abuild_home/$default_name.rsa"
-else
-	privkey="$line"
-fi
+get_privkey_file
 pubkey="$privkey.pub"
 
 # generate the private key in a subshell with stricter umask