golint is an official lint tool of Go.
https://github.com/golang/lint

It runs without setting up GOPATH, so it's a good candidate to run in the pre-upload hook.

I tried running it to tast-tests and got 98 warnings. Out of them, 68 were "exported X should have comment or be unexported" warning. Others were:

src/chromiumos/tast/local/bundles/cros/graphics/sshot/sshot.go:93:10: if block ends with a return statement, so drop this else and outdent its block
src/chromiumos/tast/local/bundles/cros/security/openfds/test.go:154:1: context.Context should be the first parameter of a function
src/chromiumos/tast/local/bundles/cros/security/selinux/coreutils.go:15:20: should omit type []string from declaration of var coreutilsFiles; it will be inferred from the right-hand side
src/chromiumos/tast/local/bundles/cros/ui/vkb/vkb.go:94:1: context.Context should be the first parameter of a function
src/chromiumos/tast/local/bundles/cros/vm/subtest/launch_terminal.go:22:8: const terminalUrlPrefix should be terminalURLPrefix
src/chromiumos/tast/local/bundles/cros/vm/subtest/linux_package_info.go:19:7: var packageId should be packageID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:29:22: func parameter ownerId should be ownerID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:29:40: func parameter appId should be appID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:54:64: func parameter ownerId should be ownerID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:54:82: func parameter appId should be appID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:79:92: func parameter appId should be appID
src/chromiumos/tast/local/bundles/cros/vm/subtest/verify_launcher_app.go:136:94: func parameter appId should be appID
src/chromiumos/tast/local/chrome/chrome.go:63:38: exported func Auth returns unexported type chrome.option, which can be annoying to use
src/chromiumos/tast/local/chrome/chrome.go:73:23: exported func KeepCryptohome returns unexported type chrome.option, which can be annoying to use
src/chromiumos/tast/local/chrome/chrome.go:81:16: exported func NoLogin returns unexported type chrome.option, which can be annoying to use
src/chromiumos/tast/local/chrome/chrome.go:89:19: exported func ARCEnabled returns unexported type chrome.option, which can be annoying to use
src/chromiumos/tast/local/chrome/chrome.go:96:31: exported func ExtraArgs returns unexported type chrome.option, which can be annoying to use
src/chromiumos/tast/local/chrome/chrome.go:113:2: struct field testExtId should be testExtID
src/chromiumos/tast/local/chrome/extensions.go:58:6: func computeExtensionId should be computeExtensionID
src/chromiumos/tast/local/chrome/display/display.go:40:6: type name will be used as display.DisplayMode by other packages, and that stutters; consider calling this Mode
src/chromiumos/tast/local/chrome/display/display.go:102:6: type name will be used as display.DisplayProperties by other packages, and that stutters; consider calling this Properties
src/chromiumos/tast/local/graphics/deqp_parser.go:40:21: should omit type map[string]struct{} from declaration of var nonFailOutcomes; it will be inferred from the right-hand side
src/chromiumos/tast/local/perf/perf_test.go:18:6: func loadJson should be loadJSON
src/chromiumos/tast/local/session/session_manager.go:26:6: type name will be used as session.SessionManager by other packages, and that stutters; consider calling this Manager
src/chromiumos/tast/local/vm/container.go:124:1: error should be the last type when returning multiple items
src/chromiumos/tast/local/vm/container.go:124:84: method result packageId should be packageID
src/chromiumos/tast/local/vm/util.go:34:2: const terminaComponentLiveUrlFormat should be terminaComponentLiveURLFormat
src/chromiumos/tast/local/vm/util.go:35:2: const terminaComponentStagingUrlFormat should be terminaComponentStagingURLFormat
src/chromiumos/tast/local/vm/util.go:36:2: const terminaComponentUrlFormat should be terminaComponentURLFormat
src/chromiumos/tast/local/vm/util.go:58:1: comment on exported function CreateDefaultContainer should be of the form "CreateDefaultContainer ..."

Most of them make sense to me (with just an exception about session.SessionManager).