esu: move esu code to esu() function

bin/epm-sh-functions

@@ -488,6 +488,62 @@ assure_root()
     is_root || fatal "run me only under root"
 }
 
+esu()
+{
+    if is_root ; then
+        if [ -n "$*" ] ; then
+            [ -n "$quiet" ] || showcmd "$*"
+            exec "$@"
+        else
+            # just shell
+            showcmd "su -"
+            exec su -
+        fi
+    fi
+
+    set_pm_type
+
+
+    escape_args()
+    {
+        local output=''
+        while [ -n "$1" ] ; do
+            if has_space "$1" ; then
+                [ -n "$output" ] && output="$output '$1'" || output="'$1'"
+            else
+                [ -n "$output" ] && output="$output $1" || output="$1"
+            fi
+            shift
+        done
+        echo "$output"
+    }
+
+    escaped="$(escape_args "$@")"
+
+
+    # sudo is not accessible, will ask root password
+    if ! set_sudo ; then
+        #info "Enter root password:"
+        if [ -n "$*" ] ; then
+            [ -n "$quiet" ] || showcmd "su - -c $escaped"
+            exec su - -c "$escaped"
+        else
+            # just shell
+            showcmd "su -"
+            exec su -
+        fi
+    fi
+
+    #info "You can be asked about your password:"
+    if [ -n "$*" ] ; then
+        [ -n "$quiet" ] || showcmd "$SUDO su - -c $escaped"
+        $SUDO su - -c "$escaped"
+    else
+        showcmd "$SUDO su -"
+        $SUDO su -
+    fi
+}
+
 regexp_subst()
 {
     local expression="$1"

bin/esu

@@ -61,55 +61,10 @@ if [ "$1" = "-c" ] ; then
     shift
 fi
 
-if is_root ; then
-    if [ -n "$*" ] ; then
-        [ -n "$quiet" ] || showcmd "$*"
-        exec "$@"
-    else
-        # just shell
-        showcmd "su -"
-        exec su -
-    fi
+# just an optimization
+if ! is_root ; then
+    # need only under user
+    set_pm_type
 fi
 
-set_pm_type
-
-
-escape_args()
-{
-    local output=''
-    while [ -n "$1" ] ; do
-        if has_space "$1" ; then
-            [ -n "$output" ] && output="$output '$1'" || output="'$1'"
-        else
-            [ -n "$output" ] && output="$output $1" || output="$1"
-        fi
-        shift
-    done
-    echo "$output"
-}
-
-escaped="$(escape_args "$@")"
-
-
-# sudo is not accessible, will ask root password
-if ! set_sudo ; then
-    #info "Enter root password:"
-    if [ -n "$*" ] ; then
-        [ -n "$quiet" ] || showcmd "su - -c $escaped"
-        exec su - -c "$escaped"
-    else
-        # just shell
-        showcmd "su -"
-        exec su -
-    fi
-fi
-
-#info "You can be asked about your password:"
-if [ -n "$*" ] ; then
-    [ -n "$quiet" ] || showcmd "$SUDO su - -c $escaped"
-    $SUDO su - -c "$escaped"
-else
-    showcmd "$SUDO su -"
-    $SUDO su -
-fi
+esu "$@"