busybox: rework and enable /var/log relink to persistent store logfiles on /storage

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/sysutils/busybox/install

@@ -92,4 +92,5 @@ USER_PWD="`$ROOT/$TOOLCHAIN/bin/cryptpw -m sha512 $USER_PASSWORD`"
   enable_service debug-shell.service
   enable_service show-version.service
   enable_service var.mount
+  enable_service var-log-debug.service
 

packages/sysutils/busybox/system.d/var-log-debug.service

@@ -1,11 +1,15 @@
 [Unit]
 Description=Debug /var/log relink
+DefaultDependencies=false
+After=systemd-tmpfiles-setup.service var.mount
+
 ConditionKernelCommandLine=debugging
 ConditionKernelCommandLine=!installer
 
 [Service]
-Environment=HOME=/storage
+Type=oneshot
 ExecStart=/bin/sh -c 'rm -rf /var/log && mkdir -p /storage/log && ln -sf /storage/log /var/log'
+RemainAfterExit=yes
 
 [Install]
-WantedBy=local-fs.target
+WantedBy=sysinit.target