Unix Sockets broken for AdvertiseClientUrls and AdvertisePeerUrls

[NHAS]

Bug report criteria

• This bug report is not security related, security issues should be disclosed privately via security@etcd.io.
• This is not a support request or question, support requests or questions should be raised in the etcd discussion forums.
• You have read the etcd bug reporting guidelines.
• Existing open issues along with etcd frequently asked questions have been checked and this is not a duplicate.

What happened?

When trying to start an ETCd member with a unix socket for advertise peer url, or client urls the address is not accepted and required the url to be in host:port format.

etcd --name server0 --initial-advertise-peer-urls unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test \
  --listen-peer-urls unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test \
  --listen-client-urls http://127.0.0.1:2480 \
  --advertise-client-urls http://127.0.0.1:2380 \
  --initial-cluster-token wag-test \
  --initial-cluster server0=unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test
  
  invalid value "unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test" for flag -initial-advertise-peer-urls: URL address does not have the form "host:port": unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test
Usage:

<omitted>

What did you expect to happen?

To be able to create a unix socket at any file location without requirement for the format host:port

How can we reproduce it (as minimally and precisely as possible)?

etcd --name server0 --initial-advertise-peer-urls unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test \
  --listen-peer-urls unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test \
  --listen-client-urls http://127.0.0.1:2480 \
  --advertise-client-urls http://127.0.0.1:2380 \
  --initial-cluster-token wag-test \
  --initial-cluster server0=unix:///tmp/c139ad0d297f3e31eb4e517e7822aa64/test

Anything else we need to know?

No response

Etcd version (please run commands below)

$ etcd --version
3.5.12

$ etcdctl version
3.5.11

Etcd configuration (command line flags or environment variables)

etcd --name server0 --initial-advertise-peer-urls unix:///tmp/wag-c139ad0d297f3e31eb4e517e7822aa64/test
--listen-peer-urls unix:///tmp/wag-c139ad0d297f3e31eb4e517e7822aa64/test
--listen-client-urls http://127.0.0.1:2480
--advertise-client-urls http://127.0.0.1:2380
--initial-cluster-token wag-test
--initial-cluster server0=unix:///tmp/wag-c139ad0d297f3e31eb4e517e7822aa64/test

Etcd debug information (please run commands below, feel free to obfuscate the IP address or FQDN in the output)

N/A

Relevant log output

No response

[ahrtr]

Unfortunately, the PR, which fixes this issue, hasn't been merged yet.

#15940

[ahrtr]

Resolved in #15940, which will be included in 3.5.13

Please try the main branch or release-3.5

[Matviy]

I don't believe that this has been fully resolved:

./etcd --listen-client-urls=unix:///tmp/socket \
       --advertise-client-urls=unix:///tmp/socket
       
{"level":"warn","ts":"2024-09-04T12:32:54.642135-0700","caller":"embed/config.go:687","msg":"Running http and grpc server on single port. This is not recommended for production."}
{"level":"info","ts":"2024-09-04T12:32:54.642234-0700","caller":"etcdmain/etcd.go:73","msg":"Running: ","args":["./etcd","--listen-client-urls=unix:///tmp/socket","--advertise-client-urls=unix:///tmp/socket"]}
{"level":"warn","ts":"2024-09-04T12:32:54.642252-0700","caller":"etcdmain/etcd.go:75","msg":"failed to verify flags","error":"--advertise-client-urls \"unix:///tmp/socket\" must be \"host:port\" (missing port in address)"}