* list the exit codes from the BSD/glibc <sysexits.h> in our own
exit-codes.[ch] tables.
-* SuccessExitStatus= and friends should probably also accept symbolic exit
- codes names, i.e. error codes from the list maintained in exit-codes.[ch]
-
* introduce Ephemeral= unit file switch, that creates an ephemeral copy of all
files and directories that are left writable for a unit, and which are
removed after the unit goes down again. A bit like --ephemeral for