Code review comment for lp:~hughsaunders/cirros/dropbearkey

using cirros-per is desirable here, we do want to re-generate keys for a new instance and you're dropping that here.

maybe something like:

how_often="instance"
# -f = file, -t = type (rsa or dss), -y = print public key (and check)
if [ -e "$file" ] && ! dropbearkey -f "$file" -y; then
  how_often="always"
  rm -f "$file"
  echo "WARN: removing invalid $file"
fi
cirros-per "$how_often" ...