Actual behavior

Any Bazel gomock(...) target that mocks a compiled library (i.e. uses the _gomock_archive rule rather than _gomock_source) fails at analysis time when built with rules_go 0.61.x:

ERROR: .../BUILD.bazel:48:7: in _gomock_archive rule //go/svc/fe:mock_sess:
Traceback (most recent call last):
    File ".../bazel_gomock+/rules/gomock.bzl", line 251, column 24, in _gomock_archive_impl
        go = go_ctx.go.path,
Error: 'struct' value has no field or method 'go'
Available attributes: _ctx, actions, archive, binary, ..., sdk, stdlib, tool_args, toolchain

rules_go 0.61 removed the deprecated .go shortcut field from the go_context struct, but _gomock_archive_impl still reads go_ctx.go.path (bazel/rules/gomock.bzl, line 256 on main / line 251 in the v0.2.0 release):

https://github.com/uber-go/mock/blob/main/bazel/rules/gomock.bzl#L256

""".format(
    go = go_ctx.go.path,            # <-- removed in rules_go 0.61
    goroot = go_ctx.sdk.root_file.dirname,
    cmd = ctx.executable.mockgen_tool.path,
),

Expected behavior

The _gomock_archive rule should build successfully against rules_go 0.61.x and generate the mock, the same as it does with rules_go 0.60.x.

To Reproduce Steps to reproduce the behavior

1. In a Bazel module using bazel_dep(name = "bazel_gomock", version = "0.2.0") and bazel_dep(name = "rules_go", version = "0.61.1"), declare a gomock target whose library is a compiled Go library (not source):

   load("@bazel_gomock//rules:gomock.bzl", "gomock")
   
   gomock(
       name = "mock_sess",
       out = "mock_sess_test.go",
       interfaces = ["SessionsClient"],
       library = "//proto/sessions/sessproto",
       package = "main",
   )

2. Build it: bazel build //path/to:mock_sess

3. Analysis fails with Error: 'struct' value has no field or method 'go'.

Additional Information

• gomock mode (reflect or source): reflect (the _gomock_archive code path)
• gomock version or git ref: bazel_gomock v0.2.0 (latest on the Bazel Central Registry); also reproduces on main
• golang version: Go 1.26.3 (via rules_go go_sdk)

Triage Notes for the Maintainers

The Go binary is already reachable via the SDK, and go_ctx.sdk.go is used two lines above in the same rule's tools list. Routing the path lookup through the SDK fixes it and is valid on both rules_go 0.60 and 0.61:

-            go = go_ctx.go.path,
+            go = go_ctx.sdk.go.path,

Note that _gomock_source_impl already calls go_context(ctx, include_deprecated_properties = False) and uses sdk.go, so only the archive path needs this change.