Arch Linux support

public/detect_linux.sh

@@ -3,6 +3,14 @@
 DISTNAME=unknown
 DISTVER=
 
+if [ -f /etc/os-release ]; then
+  . /etc/os-release
+  if [ "$ID" == "arch" ]; then
+    DISTNAME=arch
+  fi
+fi
+
+if [ "DISTNAME" = "unknown" ]; then
   if [ -f /etc/solus-release ]; then
     DISTNAME=solus
   elif [ -f /etc/lsb-release ]; then
@@ -29,5 +37,6 @@ elif [ -f /etc/debian_version ]; then
     DISTNAME=debian
     DISTVER=$(head -1 /etc/debian_version|awk -F. '{print $1}')
   fi
+fi
 
 echo ${DISTNAME}${DISTVER}