config.sh: do not install systemd if agent is init

When agent is used as init process, there is no need to install
systemd.

Signed-off-by: Peng Tao <bergwolf@gmail.com>

rootfs-builder/centos/config.sh

@@ -9,7 +9,10 @@
 OS_VERSION=${OS_VERSION:-7}
 
 #Mandatory Packages that must be installed
-# systemd: An init system that will start kata-agent
 # iptables: Need by Kata agent
-# udevlib.so: Need by Kata agent
-PACKAGES="systemd iptables"
+PACKAGES="iptables"
+
+#Optional packages:
+# systemd: An init system that will start kata-agent if kata-agent
+#          itself is not configured as init process.
+[ "$AGENT_INIT" == "no" ] && PACKAGES+=" systemd" || true

rootfs-builder/clearlinux/config.sh

@@ -5,4 +5,5 @@
 
 #Use "latest" to always pull the last Clear Linux Release
 OS_VERSION=${OS_VERSION:-latest}
-PACKAGES="systemd iptables-bin libudev0-shim"
+PACKAGES="iptables-bin libudev0-shim"
+[ "$AGENT_INIT" == "no" ] && PACKAGES+=" systemd" || true

rootfs-builder/euleros/config.sh

@@ -9,7 +9,10 @@
 OS_VERSION=${OS_VERSION:-2.2}
 
 #Mandatory Packages that must be installed
-# systemd: An init system that will start kata-agent
 # iptables: Need by Kata agent
-# udevlib.so: Need by Kata agent
-PACKAGES="systemd iptables"
+PACKAGES="iptables"
+
+#Optional packages:
+# systemd: An init system that will start kata-agent if kata-agent
+#          itself is not configured as init process.
+[ "$AGENT_INIT" == "no" ] && PACKAGES+=" systemd" || true

rootfs-builder/fedora/config.sh

@@ -5,4 +5,5 @@
 
 #Fedora version to use
 OS_VERSION=${OS_VERSION:-27}
-PACKAGES="systemd iptables"
+PACKAGES="iptables"
+[ "$AGENT_INIT" == "no" ] && PACKAGES+=" systemd" || true