Some Golang repositories apparently use a tagging scheme where each submodule in the repo gets its own tags.
In this case, the example is cloud.google.com/go and its submodules (hosted at https://github.com/googleapis/google-cloud-go). For example, for the cloud.google.com/go/longrunning submodule at version 0.4.1, the Go importer should look for a tag called "refs/tags/longrunning/v0.4.1" in the Git repository. #+begin_example $ guix import go -r cloud.google.com/go/longrunning Backtrace: 19 (primitive-load "/home/timo/.config/guix/current/bin/gu…") In guix/ui.scm: 2300:7 18 (run-guix . _) 2263:10 17 (run-guix-command _ . _) In guix/scripts/import.scm: 89:11 16 (guix-import . _) In ice-9/boot-9.scm: 1752:10 15 (with-exception-handler _ _ #:unwind? _ # _) In guix/scripts/import/go.scm: 114:22 14 (_) In guix/import/utils.scm: 638:27 13 (recursive-import _ #:repo->guix-package _ #:guix-name . #) 630:33 12 (lookup-node "cloud.google.com/go/longrunning" #f) In guix/memoization.scm: 98:0 11 (mproc "cloud.google.com/go/longrunning" # #<procedure…> …) In unknown file: 10 (_ #<procedure 7fb3e173c820 at guix/memoization.scm:17…> …) In guix/import/go.scm: 685:10 9 (_ _ #:version _ #:repo _) In ice-9/exceptions.scm: 406:15 8 (go-module->guix-package* . _) In ice-9/boot-9.scm: 1752:10 7 (with-exception-handler _ _ #:unwind? _ # _) In guix/import/go.scm: 511:19 6 (go-module->guix-package "cloud.google.com/go/longrunn…" …) In guix/git.scm: 291:4 5 (update-cached-checkout _ #:ref _ #:recursive? _ # _ # _ …) 277:19 4 (resolve _) In git/reference.scm: 60:8 3 (_ _ _) In git/bindings.scm: 77:2 2 (raise-git-error _) In ice-9/boot-9.scm: 1685:16 1 (raise-exception _ #:continuable? _) 1683:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1683:16: In procedure raise-exception: Git error: reference 'refs/tags/v0.4.1' not found #+end_example The same is true for other modules, e.g. github.com/Azure/azure-sdk-for-go/sdk/internal, where the tag is called "refs/tags/sdk/internal/v1.3.0" instead: #+begin_example $ guix import go -r github.com/Azure/azure-sdk-for-go/sdk/internal Backtrace: 19 (primitive-load "/home/timo/.config/guix/current/bin/gu…") In guix/ui.scm: 2300:7 18 (run-guix . _) 2263:10 17 (run-guix-command _ . _) In guix/scripts/import.scm: 89:11 16 (guix-import . _) In ice-9/boot-9.scm: 1752:10 15 (with-exception-handler _ _ #:unwind? _ # _) In guix/scripts/import/go.scm: 114:22 14 (_) In guix/import/utils.scm: 638:27 13 (recursive-import _ #:repo->guix-package _ #:guix-name . #) 630:33 12 (lookup-node "github.com/Azure/azure-sdk-for-go/sdk/in…" …) In guix/memoization.scm: 98:0 11 (mproc "github.com/Azure/azure-sdk-for-go/sdk/internal" …) In unknown file: 10 (_ #<procedure 7fa449ec0300 at guix/memoization.scm:17…> …) In guix/import/go.scm: 685:10 9 (_ _ #:version _ #:repo _) In ice-9/exceptions.scm: 406:15 8 (go-module->guix-package* . _) In ice-9/boot-9.scm: 1752:10 7 (with-exception-handler _ _ #:unwind? _ # _) In guix/import/go.scm: 511:19 6 (go-module->guix-package "github.com/Azure/azure-sdk-f…" …) In guix/git.scm: 291:4 5 (update-cached-checkout _ #:ref _ #:recursive? _ # _ # _ …) 277:19 4 (resolve _) In git/reference.scm: 60:8 3 (_ _ _) In git/bindings.scm: 77:2 2 (raise-git-error _) In ice-9/boot-9.scm: 1685:16 1 (raise-exception _ #:continuable? _) 1683:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1683:16: In procedure raise-exception: Git error: reference 'refs/tags/v1.3.0' not found #+end_example