Previously, cdist would silently swallow the error (no invalid config file was
generated).
Reason: `set -e` does not exit if a command in a sub-command group fails,
it merely returns with a non-zero exit status.
e.g. the following snippet does not abort the script if sshd -t returns with a
non-zero exit status:
set -e
cmp -s old new || {
# check config file and update it
sshd -t -f new \
&& cat new >old
}
or compressed:
set -e
false || { false && true; }
echo $?
# prints 1
766198912d