CI error at bash_completions.go when testing on Ubuntu latest and Go 1.11.x

[koddr]

Hi! I catch this CI error, when try to test build my app.

I use latest Cobra v1.1.3 and GitHub Actions with this config:

name: Testing CLI

on:
  push:
    branches: [dev]
    paths:
      - "configs/**"
      - "**.go"

jobs:
  build:
    name: Testing build

    strategy:
      matrix:
        go-version: [1.11.x, 1.12.x, 1.13.x, 1.14.x, 1.15.x]
        platform: [ubuntu-latest, windows-latest, macos-latest]

    runs-on: ${{ matrix.platform }}

    steps:
      - name: Set up Go 1.x
        uses: actions/setup-go@v2
        with:
          go-version: ${{ matrix.go-version }}
        id: go

      - name: Check out code into the Go module directory
        uses: actions/checkout@v2

      - name: Test
        run: go test -v -cover -race -timeout 60s ./...

And get this error at step with ubuntu-latest with go-1.11.x:

Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:22:24: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:383:26: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:423:24: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:435:27: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:473:25: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:484:20: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:499:38: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:525:21: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:562:28: undefined: io.StringWriter
Error: ../../../go/pkg/mod/github.com/spf13/cobra@v1.1.3/bash_completions.go:587:29: undefined: io.StringWriter

So, any ideas to solve this? 🤔

[willnorris]

io.StringWriter was added in go1.12 (golang/go@112f28d). So that means cobra's minimum required go version is now at least 1.12, thought it's worth noting that only 1.14 and 1.15 are tested. It would probably be good for cobra to explicitly declare the intended minimum supported go version.

Your main options as a user are to either drop go1.11 support in your project, or pin to an older version of cobra.

[koddr]

@willnorris thanks for reply.

All right, 2021 it's time to drop Go v1.11 from my project. Sad but true 🤷