Added security and functionality.

- Introduced a sudo-nopasswd script that allows users to edit and update
  in one shot.
- Use random suffix on temp files to avoid collisions and hacks.

src/sudo_no_passwd_constants.sh

@@ -1,9 +1,12 @@
 #!/bin/bash
+if [ ! "$INSTANCE" ]; then
+	INSTANCE="$(head -c10 /dev/urandom | base32)"
+fi
 ETC_FILE="/etc/sudo-nopasswd"
 SUDOERS_FILE="/etc/sudoers"
-SUDOERS_BAK="/etc/sudoers.bak"
-BEFORE_COMMANDS="/tmp/sudo-nopasswd-before"
-AFTER_COMMANDS="/tmp/sudo-nopasswd-after"
+SUDOERS_BAK="/etc/sudoers.bak_$INSTANCE"
+BEFORE_COMMANDS="/tmp/sudo-nopasswd-before-$INSTANCE"
+AFTER_COMMANDS="/tmp/sudo-nopasswd-after-$INSTANCE"
 SCRIPT_NAME="update-sudo-nopasswd"
 
 # Installation paths
@@ -15,5 +18,3 @@ INITD_DIR="/etc/init.d"
 
 UPDATE_COMMAND="update-sudo-nopasswd"
 WATCH_COMMAND="watch-sudo-nopasswd"
-
-SHARE_DIR="/usr/share/sudo-nopasswd"