hack/test-port-forwarding.pl: add reporting "failed to listen tcp"

[norio-nomura]

Add reporting for the "failed to listen tcp" error.
Additionally, it should print information about the processes listening on the failed ports.

e.g.

$ socat TCP-LISTEN:2020,bind=127.0.0.1,fork /dev/null&
$ socat TCP-LISTEN:4040,bind=127.0.0.1,fork /dev/null&
$ hack/test-port-forwarding.pl default
✅ Not forwarding TCP 127.0.0.2:3000
✅ Forwarding TCP from 127.0.0.3:3001 to 127.0.0.1:2001
✅ Forwarding TCP from 0.0.0.0:3002 to 127.0.0.1:2002
✅ Not forwarding TCP 0.0.0.0:3010
✅ Not forwarding TCP 127.0.0.1:3011
❌ Forwarding TCP from 127.0.0.2:3020 to 127.0.0.1:2020
   Guest received: ''
✅ Forwarding TCP from 127.0.0.1:3021 to 127.0.0.1:2021
✅ Forwarding TCP from 0.0.0.0:3022 to 127.0.0.1:2022
✅ Forwarding TCP from [::]:3023 to 127.0.0.1:2023
✅ Forwarding TCP from [::1]:3024 to 127.0.0.1:2024
✅ Forwarding TCP from 127.0.0.1:3030 to 192.168.12.19:2030
✅ Forwarding TCP from 0.0.0.0:3031 to 192.168.12.19:2031
✅ Forwarding TCP from [::]:3032 to 192.168.12.19:2032
✅ Forwarding TCP from [::1]:3033 to 192.168.12.19:2033
✅ Forwarding TCP from 127.0.0.1:300 to 127.0.0.1:300
✅ Forwarding TCP from 127.0.0.1:310 to 0.0.0.0:310
✅ Forwarding TCP from 192.168.5.15:4000 to 192.168.12.19:4000
✅ Forwarding TCP from [::1]:4010 to [::]:4010
✅ Forwarding TCP from 127.0.0.1:4020 to 192.168.12.19:4020
✅ Forwarding TCP from 127.0.0.2:4021 to 192.168.12.19:4021
✅ Forwarding TCP from 192.168.5.15:4022 to 192.168.12.19:4022
✅ Forwarding TCP from 0.0.0.0:4023 to 192.168.12.19:4023
✅ Forwarding TCP from [::]:4024 to 192.168.12.19:4024
✅ Forwarding TCP from [::1]:4025 to 192.168.12.19:4025
✅ Forwarding TCP from 127.0.0.1:4030 to 192.168.12.19:4030
✅ Forwarding TCP from 127.0.0.2:4031 to 192.168.12.19:4031
✅ Forwarding TCP from 192.168.5.15:4032 to 192.168.12.19:4032
✅ Forwarding TCP from 0.0.0.0:4033 to 192.168.12.19:4033
✅ Forwarding TCP from [::]:4034 to 192.168.12.19:4034
✅ Forwarding TCP from [::1]:4035 to 192.168.12.19:4035
❌ Forwarding TCP from 0.0.0.0:4040 to 127.0.0.1:4040
   Guest received: ''
✅ Forwarding TCP from [::]:4041 to 127.0.0.1:4041
✅ Not forwarding TCP 127.0.0.1:4043
✅ Not forwarding TCP 192.168.5.15:4044
✅ Forwarding TCP from 127.0.0.1:5000 to /Users/norio/.lima/default/sock/port5000.sock
⚠️  failed to listen tcp: listen tcp 127.0.0.1:2020: bind: address already in use
⚠️  failed to listen tcp: listen tcp 127.0.0.1:4040: bind: address already in use
COMMAND   PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
socat1  76346 norio    5u  IPv4 0x4a9052b6dc39e98b      0t0  TCP localhost:2020 (LISTEN)
socat1  76381 norio    5u  IPv4 0x35a18a4bd36fb075      0t0  TCP localhost:4040 (LISTEN)

[AkihiroSuda]

Thanks

[norio-nomura]

Thanks! 🙏🏻
I was considering how to make it fail intentionally to add a commit and check the operation.
I’ll check the future jobs and ensure they work as intended in case of failure.