nix-git/examples/block-while-remote-file-exists.sh

#!/usr/bin/env bash
set -eu -o pipefail

# As long as there is the file `stay-alive` at host `yodaNas`,
# this loop blocks/waits.
while :; do
  result="$(ssh yodaNas 'ls stay-alive 2>&1')" || :
  case "${result}" in
    *'No such file or directory')
      break
      ;;
    'stay-alive')
      printf '%s\n' 'Delaying suspend due to stay-alive file.'
      ;;
    *)
      printf '%s\n' 'Delaying suspend due to SSH connectivity problems.'
      ;;
  esac
  sleep 10s
done