Update metalinter, fix a few lint warnings and replace deprecated linters.
`deadcode`, `structcheck` and `varcheck` are abandoned and now replaced by [`unused`][1].
Since 1.19, `go fmt` reformats godocs according to https://go.dev/doc/comment. I've done a bulk-reformatting of the codebase to keep the linter happy. Backporting is mostly harmless (the exception being `lib/services/role_test.go`, that for some reason breaks the _old_ linter using the new format).
[1]: https://golangci-lint.run/usage/linters/
* Bump golangci-lint version
* Replace abandoned linters
* Fix bodyclose on lib/auth/github.com
* Fix bodyclose on lib/kube/proxy/streamproto/proto_test.go
* Fix bodyclose on lib/srv/alpnproxy/proxy_test.go
* Fix bodyclose on lib/web/conn_upgrade_test.go
* Silence staticcheck on lib/kube/proxy/forwarder_test.go
* Silence staticcheck on lib/utils/certs_test.go
* Address BuildNameToCertificate deprecation warnings
* Run `go fmt ./...`
* Run `go fmt ./...` on api/
* Ignore formatting in role_test.go
* Remove redundant initializers in lib/srv/uacc/
* Update e/
Making all of our integration tests run in entirely parallel requires
a large engineering effort to enforce test isolation and remove all race
conditions between tests.
A lower-effort alternative may be to split apart the various test suites
into their own Go packages, and test those packages in parallel, even if
the tests inside are still executed serially. Auditing the test suites
for races on system-level resources (e.g. files, ports) is much easier
than chasing down every p[ossible race in the testing system.
This patch acts as a trial run, breaking a fairly well-defined and
self-contained test suite out into its own package. Note that the goal of
this change is not necessarily to shave minutes off the build (although
that would be nice), but to act as an illustration of how other, less
well-formed test suites might be broken apart.
See-Also: #12421
See-Also: #14408
Ports used by the unit tests have been allocated by pulling them out of a list, with no guarantee that the port is not actually in use. This central allocation point also means that tests cannot be split into separate packages to be run in parallel, as the ports allocated between the various packages will be allocated multiple times and end up intermittently clashing.
There is also no guarantee, even when the tests are run serially, that the ports will not clash with services already running on the machine.
This patch (largely) replaces the use of this centralised port allocation with pre-created listeners injected into the test via the file descriptor import mechanism use by Teleport to pass open ports to child processes.
There are still some cases where the old port allocation system is still in use. I felt this was already getting beyond the bounds of sensibly reviewable, so I have left those for a further PR after this.
See-Also: #12421
See-Also: #14408
Alan Parra