conf: allow --fd 0

inetd-style socket passing traditionally starts a service with a
connected socket on file descriptors 0 and 1.  passt disallowing
obtaining its socket from either of these descriptors made it
difficult to use with super-servers providing this interface — in my
case I wanted to use passt with s6-ipcserver[1].  Since (as far as I
can tell) passt does not use standard input for anything else (unlike
standard output), it should be safe to relax the restrictions on --fd
to allow setting it to 0, enabling this use case.

Link: https://skarnet.org/software/s6/s6-ipcserver.html [1]
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions