Prefer su over sudo.

cdist/conf/explorer/sucmd

@@ -19,27 +19,47 @@
 #
 # This explorer returns script code string for running a command with su
 # or sudo, whichever it founds. If searches the command in the order of
-# first sudo and then su if sudo is not found.
-# If no sudo nor su is found then it returns string script code to run
+# first su and then sudo if su is not found.
+# If no su nor sudo is found then it returns string script code to run
 # bare command.
 # It uses two arguments, first user and the second command to run.
 # If the result string is assigned to foo it is used as:
 # $ $foo user command
 #
 
-# first check sudo
-which sudo > /dev/null 2>&1
-if [ $? -eq 0 ]
-then
+sudo_func() {
+    which sudo > /dev/null 2>&1
+    if [ $? -eq 0 ]
+    then
         func='f() { sudo -H -u $1 $2; }'
-else
-    # if no sudo then check su
+        retval=0
+    else
+        func=''
+        retval=1
+    fi
+    return $retval
+}
+su_func() {
     which su > /dev/null 2>&1
     if [ $? -eq 0 ]
     then
         func='f() { su -c "$2" $1 ; }'
+        retval=0
     else
-        # if no sudo nor su then run bare command
+        func=''
+        retval=1
+    fi
+    return $retval
+}
+# first check su
+su_func
+if [ $? -ne 0 ]
+then
+    # if no su then check sudo
+    sudo_func
+    if [ $? -ne 0 ]
+    then
+        # if no su nor sudo then run bare command
         func='f() { $2 ; }'
     fi
 fi