fix style nitpicks (#12995)

* disable restriction (for now)

* reduce duplication

* remove duplication in scim view

* fix diff

* fix reassign

* remove statment that is always wrong

* log with full context

* allign order to anguage defaults

* adress shelldre:S7688

contrib/installer/src/root_command.sh

@@ -16,23 +16,23 @@ function do_call() {
 }
 
 function get_distribution {
-    if [ -f /etc/os-release ]; then
+    if [[ -f /etc/os-release ]]; then
         . /etc/os-release
         OS=$NAME
         VER=$VERSION_ID
     elif type lsb_release >/dev/null 2>&1; then
         OS=$(lsb_release -si)
         VER=$(lsb_release -sr)
-    elif [ -f /etc/lsb-release ]; then
+    elif [[ -f /etc/lsb-release ]]; then
         . /etc/lsb-release
         OS=$DISTRIB_ID
         VER=$DISTRIB_RELEASE
-    elif [ -f /etc/debian_version ]; then
+    elif [[ -f /etc/debian_version ]]; then
         OS=Debian
         VER=$(cat /etc/debian_version)
-    elif [ -f /etc/SuSe-release ]; then
+    elif [[ -f /etc/SuSe-release ]]; then
         OS=SEL
-    elif [ -f /etc/redhat-release ]; then
+    elif [[ -f /etc/redhat-release ]]; then
         OS=RedHat
     else
         OS=$(uname -s)