lpac: fix the wrapper

Some env variables sensitive for proper lpac functioning
can be set by upper lpac wrappers such as lpac-libmbim-wrapper.
If that's the case, we shouldn't override them,
otherwise the wrapper won't work.

Also, we shouldn't interpret values of the debug env
variables. Instead, we just pass them as is if the
corresponding uci optioins exist.

fixes #25035

Signed-off-by: GitHub <noreply@github.com>

utils/lpac/files/lpac.sh

@@ -2,32 +2,18 @@
 
 . /lib/config/uci.sh
 
-APDU_BACKEND="$(uci_get lpac global apdu_backend uqmi)"
-APDU_DEBUG="$(uci_get lpac global apdu_debug 0)"
+: "${LPAC_APDU=$(uci_get lpac global apdu_backend)}"; export LPAC_APDU
+LIBEUICC_DEBUG_APDU="$(uci_get lpac global apdu_debug)" && export LIBEUICC_DEBUG_APDU
 
-HTTP_BACKEND="$(uci_get lpac global http_backend curl)"
-HTTP_DEBUG="$(uci_get lpac global http_debug 0)"
-
-export LPAC_HTTP="$HTTP_BACKEND"
-if [ "$HTTP_DEBUG" -eq 1 ]; then
-    export LIBEUICC_DEBUG_HTTP="1"
-fi
-
-export LPAC_APDU="$APDU_BACKEND"
-if [ "$APDU_DEBUG" -eq 1 ]; then
-    export LIBEUICC_DEBUG_APDU="1"
+if [ "$LPAC_APDU" = "at" ]; then
+    export AT_DEVICE="$(uci_get lpac at device)"
+    AT_DEBUG="$(uci_get lpac at debug)" && export AT_DEBUG
+elif [ "$LPAC_APDU" = "uqmi" ]; then
+    export LPAC_QMI_DEV="$(uci_get lpac uqmi device)"
+    LPAC_QMI_DEBUG="$(uci_get lpac uqmi debug)" && export LPAC_QMI_DEBUG
 fi
 
-if [ "$APDU_BACKEND" = "at" ]; then
-    AT_DEVICE="$(uci_get lpac at device /dev/ttyUSB2)"
-    AT_DEBUG="$(uci_get lpac at debug 0)"
-    export AT_DEVICE="$AT_DEVICE"
-    export AT_DEBUG="$AT_DEBUG"
-elif [ "$APDU_BACKEND" = "uqmi" ]; then
-    UQMI_DEV="$(uci_get lpac uqmi device /dev/cdc-wdm0)"
-    UQMI_DEBUG="$(uci_get lpac uqmi debug 0)"
-    export LPAC_QMI_DEV="$UQMI_DEV"
-    export LPAC_QMI_DEBUG="$UQMI_DEBUG"
-fi
+export LPAC_HTTP="$(uci_get lpac global http_backend)"
+LIBEUICC_DEBUG_HTTP="$(uci_get lpac global http_debug)" && export LIBEUICC_DEBUG_HTTP
 
-/usr/lib/lpac "$@"
+exec /usr/lib/lpac "$@"

utils/lpac/files/lpac.uci

@@ -1,13 +1,13 @@
 config global global
 	option		apdu_backend	'uqmi'
 	option		http_backend	'curl'
-	option		apdu_debug	'0'
-	option		http_debug	'0'
+#	option		apdu_debug	'1'
+#	option		http_debug	'1'
 
 config at at
 	option		device		'/dev/ttyUSB2'
-	option		debug		'0'
+#	option		debug		'1'
 
 config uqmi uqmi
 	option		device		'/dev/cdc-wdm0'
-	option		debug		'0'
+#	option		debug		'1'		# value matters