treewide: fix previously disabled shellcheck warnings

Warnings are either fixed properly, or disabled in a more fine-grained
manner.

package/gluon-alfred/files/usr/lib/autoupdater/abort.d/60gluon-alfred

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
-
 start_enabled alfred

package/gluon-alfred/files/usr/lib/autoupdater/download.d/40gluon-alfred

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
-
 stop alfred

package/gluon-autoupdater/files/usr/lib/autoupdater/abort.d/90gluon-autoupdater

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 

package/gluon-autoupdater/files/usr/lib/autoupdater/download.d/10gluon-autoupdater

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 

package/gluon-core/files/lib/gluon/label_mac.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091
+
 . /lib/functions/system.sh
 
 get_mac_label

package/gluon-core/files/lib/netifd/proto/gluon_mesh.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091
+
 . /lib/functions.sh
 . ../netifd-proto.sh
 init_proto "$@"

package/gluon-core/files/lib/netifd/proto/gluon_wired.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091
+
 . /lib/functions.sh
 . ../netifd-proto.sh
 init_proto "$@"
@@ -17,7 +19,8 @@ xor2() {
 }
 
 is_layer3_device () {
-	local addrlen="$(cat "/sys/class/net/$1/addr_len")"
+	local addrlen
+	addrlen="$(cat "/sys/class/net/$1/addr_len")"
 	test "$addrlen" -eq 0
 }
 
@@ -34,7 +37,8 @@ interface_linklocal() {
 		return
 	fi
 
-	local macaddr="$(ubus call network.device status '{"name": "'"$1"'"}' | jsonfilter -e '@.macaddr')"
+	local macaddr
+	macaddr="$(ubus call network.device status '{"name": "'"$1"'"}' | jsonfilter -e '@.macaddr')"
 	local oldIFS="$IFS"; IFS=':'; set -- $macaddr; IFS="$oldIFS"
 
 	echo "fe80::$(xor2 "$1")$2:$3ff:fe$4:$5$6"

package/gluon-ebtables-limit-arp/files/usr/lib/autoupdater/abort.d/15start-arp-limiter

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 # Start after network

package/gluon-ebtables-limit-arp/files/usr/lib/autoupdater/upgrade.d/05stop-arp-limiter

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 # Stop before network

package/gluon-mesh-batman-adv/files/lib/netifd/proto/gluon_bat0.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091,SC2034
+
 . /lib/functions.sh
 . ../netifd-proto.sh
 init_proto "$@"
@@ -37,7 +39,8 @@ proto_gluon_bat0_renew() {
 proto_gluon_bat0_setup() {
 	local config="$1"
 
-	local routing_algo="$(lookup_site 'mesh.batman_adv.routing_algo' 'BATMAN_IV')"
+	local routing_algo
+	routing_algo="$(lookup_site 'mesh.batman_adv.routing_algo' 'BATMAN_IV')"
 
 	local gw_mode
 	json_get_vars gw_mode
@@ -54,7 +57,8 @@ proto_gluon_bat0_setup() {
 			batctl gw_mode "server"
 		;;
 		client)
-			local gw_sel_class="$(lookup_site 'mesh.batman_adv.gw_sel_class')"
+			local gw_sel_class
+			gw_sel_class="$(lookup_site 'mesh.batman_adv.gw_sel_class')"
 			if [ -n "$gw_sel_class" ]; then
 				batctl gw_mode "client" "$gw_sel_class"
 			else
@@ -67,7 +71,8 @@ proto_gluon_bat0_setup() {
 	esac
 
 
-	local primary0_mac="$(lua -e 'print(require("gluon.util").generate_mac(3))')"
+	local primary0_mac
+	primary0_mac="$(lua -e 'print(require("gluon.util").generate_mac(3))')"
 
 	ip link add primary0 type dummy
 	echo 1 > /proc/sys/net/ipv6/conf/primary0/disable_ipv6

package/gluon-mesh-batman-adv/files/usr/lib/autoupdater/abort.d/10start-network

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 pidof netifd >/dev/null || start_enabled network

package/gluon-mesh-batman-adv/files/usr/lib/autoupdater/upgrade.d/10stop-network

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 wifi down

package/gluon-mesh-olsrd/files/usr/lib/autoupdater/abort.d/10olsrd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 

package/gluon-mesh-olsrd/files/usr/lib/autoupdater/upgrade.d/10olsrd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 

package/gluon-mesh-vpn-wireguard/files/lib/gluon/mesh-vpn/wireguard_pubkey.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091,SC2034
+
 INCLUDE_ONLY=1
 . /lib/netifd/proto/wireguard.sh
 

package/gluon-mesh-vpn-wireguard/files/lib/netifd/proto/gluon_wireguard.sh

 #!/bin/sh
 
+# shellcheck disable=SC1091
+
+# FIXME: The following lints should not need to be disabled
+# shellcheck disable=SC2034,SC2155
+
 PROTO_DEBUG=1
 
 . /lib/functions.sh

package/gluon-radvd/files/usr/lib/autoupdater/abort.d/80gluon-radvd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
-
 start_enabled gluon-radvd

package/gluon-radvd/files/usr/lib/autoupdater/download.d/20gluon-radvd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
-
 stop gluon-radvd

package/gluon-respondd/files/usr/lib/autoupdater/abort.d/50gluon-respondd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
 

package/gluon-respondd/files/usr/lib/autoupdater/download.d/50gluon-respondd

 #!/bin/sh
 
+# shellcheck source=package/gluon-autoupdater/files/lib/gluon/autoupdater/lib.sh
 . /lib/gluon/autoupdater/lib.sh
 
-
 stop gluon-respondd