Make the error messages on exit show something useful.

pkg/redhat/build.sh

@@ -4,8 +4,7 @@
 set -e
 
 # Debugging shizz
-trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
-trap 'if [ $? -ne 0 ]; then echo "\"${last_command}\" command filed with exit code $?."; fi' EXIT
+trap 'ERRCODE=$? && if [ ${ERRCODE} -ne 0 ]; then echo "The command \"${BASH_COMMAND}\" failed in \"${FUNCNAME}\" with exit code ${ERRCODE}."; fi' EXIT
 
 OS_VERSION=$(cat /etc/os-release | grep "^VERSION_ID=" | awk -F "=" '{ print $2 }' | sed 's/"//g')
 OS_NAME=$(cat /etc/os-release | grep "^ID=" | awk -F "=" '{ print $2 }' | sed 's/"//g')