usage: rguard [-1 | -0] [-f FILE] [-F FILE] [-u UNIT] [-c CMD] [-a ARGS]
              [-r COMMAND] [-h] [-i SEC] [-n] [-x]
              [-v {debug,info,warning,error}] [-t]

Block systemd-initiated shutdown until configurable condition checks pass

SET AND QUIT:
  Execute a single action with no condition checks.

  -1, --install-guard   Install reboot-guard and immediately exit
  -0, --remove-guard    Remove reboot-guard (if present) and immediately exit

CONFIGURE CONDITIONS:
  Establish what condition checks must pass to allow shutdown.
  Each option may be specified multiple times.

  -f, --forbid-file FILE
                        Prevent shutdown while FILE exists
  -F, --require-file FILE
                        Prevent shutdown until FILE exists
  -u, --unit UNIT       Prevent shutdown while systemd UNIT is active
  -c, --cmd CMD         Prevent shutdown while CMD exactly matches at least 1
                        running process
  -a, --args ARGS       Prevent shutdown while ARGS exactly matches the full
                        cmd+args of at least 1 running process
  -r, --run COMMAND     Prevent shutdown while execution of COMMAND fails;
                        prefix COMMAND with '!' to prevent shutdown while
                        execution succeeds (MORE: Prefix COMMAND with '@' to
                        execute it as a shell command, e.g., to use pipes '|'
                        or other logic; examples: '@cmd|cmd' or '!@cmd|cmd')

GENERAL OPTIONS:

  -h, --help            Show this help message and exit
  -i, --interval SEC    Modify the sleep interval between condition checks
                        (default: 60 seconds)
  -n, --ignore-signals  Ignore the most common signals (HUP, INT, QUIT, USR1,
                        USR2, TERM), in which case a graceful exit requires
                        the next option or else SIGKILL
  -x, --exit-on-pass    Exit (and remove reboot-guard) the first time all
                        condition checks pass
  -v, --loglevel {debug,info,warning,error}
                        Specify minimum message type to print (default:
                        warning)
  -t, --timestamps      Enable timestamps in message output (not necessary if
                        running as systemd service)

EXAMPLES:
  As mentioned above, all of the condition-checking options can be used
  multiple times. All specified checks must pass to allow shutdown.

  rguard --forbid-file /shutdown/prevented/if/this/file/exists

  rguard --require-file /shutdown/prevented/until/this/file/exists

  rguard --cmd some-cmd-name-which-when-running-prevents-shutdown
           * e.g., 'bash' or 'firefox'

  rguard --args 'syndaemon -i 1.0 -t -K -R'
           * Prevent shutdown if this exact cmd + args are found running

  rguard --run 'ping -c2 -w1 -W1 10.0.0.1'
           * Allow shutdown only if single command (ping in this case) succeeds

  rguard --run '!ping -c2 -w1 -W1 10.0.0.1'
           * Allow shutdown only if single command FAILS

  rguard --run '!findmnt /mnt'
           * Allow shutdown if nothing mounted at mountpoint

  rguard --run '@some_cmd | some_other_cmd; another_cmd'
           * Allow shutdown only if last cmd in shell succeeds
           * When using '@', full shell syntax is supported
           * e.g.: '|', '&&', '||', ';', '>', '>>', '<', etc

  rguard --run '!@lsof -i:ssh | grep -q ESTABLISHED'
           * Allow shutdown only if shell commands FAIL
           * In this example, only if there are no established ssh connections