distr_info: cleanup code, fix quotes

bin/distr_info

@@ -354,11 +354,16 @@ esac
 echo "$DIST_OS"
 }
 
+get_uname_m()
+{
+    uname -m | tr [:upper:] [:lower:] | tr -d " \t\r\n"
+}
+
 get_arch()
 {
 local DIST_ARCH
 # Resolve the architecture
-DIST_ARCH=`uname -m | tr [:upper:] [:lower:] | tr -d " \t\r\n"`
+DIST_ARCH="$(get_uname_m)"
 case "$DIST_ARCH" in
     'ia32' | 'i386' | 'i486' | 'i586' | 'i686')
         DIST_ARCH="x86"
@@ -385,7 +390,7 @@ case "$DIST_ARCH" in
         DIST_ARCH="parisc"
         ;;
     armv*)
-        if [ -z "`readelf -A /proc/self/exe | grep Tag_ABI_VFP_args`" ] ; then
+        if [ -z "$(readelf -A /proc/self/exe | grep Tag_ABI_VFP_args)" ] ; then
             DIST_ARCH="armel"
         else
             DIST_ARCH="armhf"
@@ -399,7 +404,7 @@ get_bit_size()
 {
 local DIST_BIT
 # Check if we are running on 64bit platform, seems like a workaround for now...
-DIST_BIT=`uname -m | tr [:upper:] [:lower:] | tr -d " \t\r\n"`
+DIST_BIT="$(get_uname_m)"
 case "$DIST_BIT" in
     'amd64' | 'ia64' | 'x86_64' | 'ppc64')
         DIST_BIT="64"
@@ -423,18 +428,20 @@ echo "$DIST_BIT"
 # TODO: check before calc
 get_memory_size() {
     local detected=0
-    local DIST_OS=$(get_base_os_name)
-    if [ $DIST_OS = "macosx" ]
-    then
+    local DIST_OS="$(get_base_os_name)"
+    case "$DIST_OS" in
+        macosx)
             detected=$((`sysctl hw.memsize | sed s/"hw.memsize: "//`/1024/1024))
-    elif [ $DIST_OS = "freebsd" ]
-    then
+            ;;
+        freebsd)
             detected=$((`sysctl hw.physmem | sed s/"hw.physmem: "//`/1024/1024))
-    elif [ $DIST_OS = "linux" ]
-    then
+            ;;
+        linux)
             [ -r /proc/meminfo ] && detected=$((`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`/1024))
-    fi
-# Exit codes only support values between 0 and 255. So use stdout.
+            ;;
+    esac
+
+    # Exit codes only support values between 0 and 255. So use stdout.
     echo $detected
 }