Databases other than /etc/{passwd,group} not considered when searching for etcd user/group

[bachorp]

Environmental Info:
RKE2 Version: 2.31.5+rke2r1

Node(s) CPU architecture, OS, and Version: x86_64 EL9.4

Cluster Configuration: single node

Describe the bug:

RKE2

Steps To Reproduce:

• Installed RKE2: Installation on a rhel-bootc node. Using RKE2 with profile: cis

Expected behavior:

User and group etcd are found.

Actual behavior:

rke2-server fails and reports missing etcd user and group.

Additional context / logs:

The library used here

rke2/pkg/podexecutor/staticpod.go

Line 585 in 1747907

etcdUser, err := user.Lookup("etcd")

will search only /etc/passwd and /etc/group (see https://go.dev/src/os/user/lookup.go). However, other user databases might be used (in my case /usr/lib/{passwd,group}. golang/go#38810 might be related.

[brandond]

Since this is an issue with the golang stdlib, not this project, I'm going to close it.

If the go stdlib ever changes the functionality of their user/group lookup functions it should be fixed - but this is not something we are looking to hand-roll at the moment.

We can update our documentation to mention that we inherit go's support for only traditional user/group lookups.