dockerd: refactoring uciadd and ucidel handling

This change makes the handling of adding and deleting interface, device
bridge and firewall more robust.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

utils/dockerd/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dockerd
 PKG_VERSION:=20.10.7
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=Apache-2.0
 PKG_LICENSE_FILES:=LICENSE
 

utils/dockerd/files/dockerd.init

@@ -17,6 +17,28 @@ json_add_array_string() {
 	json_add_string "" "${1}"
 }
 
+find_network_device() {
+	local device="${1}"
+	local device_section=""
+
+	check_device() {
+		local cfg="${1}"
+		local device="${2}"
+
+		local type name
+		config_get type "${cfg}" type
+		config_get name "${cfg}" name
+
+		[ "${type}" = "bridge" ] && [ "${name}" = "${device}" ] \
+			&& device_section="${cfg}"
+	}
+
+	config_load network
+	config_foreach check_device device "${device}"
+
+	echo "${device_section}"
+}
+
 boot() {
 	uciadd
 	rc_procd start_service
@@ -40,32 +62,31 @@ uciadd() {
 
 	# Add network interface
 	if ! uci_quiet get network.${iface}; then
-		logger -t "dockerd-init" -p notice "Adding docker default interface to network uci config (${iface})"
+		logger -t "dockerd-init" -p notice "Adding interface '${iface}' to network config"
 		uci_quiet add network interface
 		uci_quiet rename network.@interface[-1]="${iface}"
-		uci_quiet set network.@interface[-1].ifname="${device}"
+		uci_quiet set network.@interface[-1].device="${device}"
 		uci_quiet set network.@interface[-1].proto="none"
 		uci_quiet set network.@interface[-1].auto="0"
 		uci_quiet commit network
 	fi
 
 	# Add docker bridge device
-	if ! uci_quiet get network.${device}; then
-		logger -t "dockerd-init" -p notice "Adding docker default bridge device to network uci config (${device})"
+	if [ "$(find_network_device "$device")" = "" ]; then
+		logger -t "dockerd-init" -p notice "Adding bridge device '${device}' to network config"
 		uci_quiet add network device
-		uci_quiet rename network.@device[-1]="${device}"
 		uci_quiet set network.@device[-1].type="bridge"
 		uci_quiet set network.@device[-1].name="${device}"
-		uci_quiet add_list network.@device[-1].ifname="${device}"
 		uci_quiet commit network
+	else
+		logger -t "dockerd-init" -p notice "Bridge device '${device}' already defined in network config"
 	fi
 
 	# Add firewall zone
 	if ! uci_quiet get firewall.${zone}; then
-		logger -t "dockerd-init" -p notice "Adding docker default firewall zone to firewall uci config (${zone})"
+		logger -t "dockerd-init" -p notice "Adding firewall zone '${zone}' to firewall config"
 		uci_quiet add firewall zone
 		uci_quiet rename firewall.@zone[-1]="${zone}"
-		uci_quiet set firewall.@zone[-1].network="${iface}"
 		uci_quiet set firewall.@zone[-1].input="ACCEPT"
 		uci_quiet set firewall.@zone[-1].output="ACCEPT"
 		uci_quiet set firewall.@zone[-1].forward="ACCEPT"
@@ -73,6 +94,13 @@ uciadd() {
 		uci_quiet commit firewall
 	fi
 
+	# Add interface to firewall zone
+	if uci_quiet get firewall.${zone}; then
+		uci_quiet del_list firewall.${zone}.network="${iface}"
+		uci_quiet add_list firewall.${zone}.network="${iface}"
+		uci_quiet commit firewall
+	fi
+
 	reload_config
 }
 
@@ -92,21 +120,29 @@ ucidel() {
 		exit 0
 	}
 
-	if uci_quiet get network.${device}; then
-		logger -t "dockerd-init" -p notice "Deleting docker default bridge device from network uci config (${device})"
-		uci_quiet delete network.${device}
+	# Remove network device
+	if uci_quiet delete network.$(find_network_device "${device}"); then
+		logger -t "dockerd-init" -p notice "Deleting bridge device '${device}' from network config"
 		uci_quiet commit network
 	fi
 
+	# Remove network interface
 	if uci_quiet get network.${iface}; then
-		logger -t "dockerd-init" -p notice "Deleting docker default interface from network uci config (${iface})"
+		logger -t "dockerd-init" -p notice "Deleting interface '${iface}' from network config"
 		uci_quiet delete network.${iface}
 		uci_quiet commit network
 	fi
 
+	# Remove interface from firewall zone
 	if uci_quiet get firewall.${zone}; then
-		logger -t "dockerd-init" -p notice "Deleting docker firewall zone from firewall uci config (${zone})"
-		uci_quiet delete firewall.${zone}
+		logger -t "dockerd-init" -p notice "Deleting network interface '${iface}' in zone '${zone}' from firewall config"
+		uci_quiet del_list firewall.${zone}.network="${iface}"
+		uci_quiet commit firewall
+		# Remove Firewall zone if network is empty
+		if ! uci_quiet get firewall.${zone}.network; then
+			logger -t "dockerd-init" -p notice "Deleting firewall zone '${zone}' from firewall config"
+			uci_quiet delete firewall.${zone}
+		fi
 		uci_quiet commit firewall
 	fi