Retrieve go version from go.mod file

[pantelis-karamolegkos]

Description:
Instead of hard-coding the go version, the action could (optionally)

• search in the root of the project (or in any other configurable place) for a go.mod file
• extract and use the go version specified there.

Justification:
Justification or a use case for your proposal.

Are you willing to submit a PR?

[TMaYaD]

FWIW, this is the workaround I use:

      - run: sed -En 's/^go[[:space:]]+([[:digit:].]+)$/GO_VERSION=\1/p' go.mod >> $GITHUB_ENV
      - uses: actions/setup-go@v2
        with:
          go-version: ${{ env.GO_VERSION }}

[thetillhoff]

Thanks @TMaYaD, that helped me a lot!
Here's a slightly shorter version that IMO is a bit easier to understand:

      - run: sed -En 's/^go (.*)$/GO_VERSION=\1/p' go.mod >> $GITHUB_ENV
      - uses: actions/setup-go@v2
        with:
          go-version: "${{ env.GO_VERSION }}"

[Prajwal-Koirala]

Linux

- name: Get the system requirements.
  run: sudo apt-get install coreutils -y
- name: Get the current version of Go from project.
  run: cat go.mod | head -3 | tail -1 | echo "GO_VERSION_FROM_PROJECT=$(cut -d' ' -f2)" >>${GITHUB_ENV}
- name: Set up Go version "${{ env.GO_VERSION_FROM_PROJECT }}"
  uses: actions/setup-go@v2
  with:
    go-version: "${{ env.GO_VERSION_FROM_PROJECT }}"
  id: go

MacOS

- name: Get the system requirements.
  run: brew install coreutils
- name: Get the current version of Go from project.
  run: cat go.mod | head -3 | tail -1 | echo "GO_VERSION_FROM_PROJECT=$(cut -d' ' -f2)" >>${GITHUB_ENV}
- name: Set up Go version "${{ env.GO_VERSION_FROM_PROJECT }}"
  uses: actions/setup-go@v2
  with:
    go-version: "${{ env.GO_VERSION_FROM_PROJECT }}"
  id: go

Windows

- name: Get the current version of Go from project.
  run: type go.mod | select -first 3 | select -last 1 | %{ 'GO_VERSION_FROM_PROJECT={1}' -f ($_ -split ' ') } >>$env:GITHUB_ENV
- name: Set up Go version "${{ env.GO_VERSION_FROM_PROJECT }}"
  uses: actions/setup-go@v2
  with:
    go-version: "${{ env.GO_VERSION_FROM_PROJECT }}"
  id: go

[tisba]

Since Go is already available on the GH Action runners, you can have it as simple as:

go mod edit -json | jq -r .Go

[Prajwal-Koirala]

Since Go is already available on the GH Action runners, you can have it as simple as:

go mod edit -json | jq -r .Go

What's for windows??

[vsafonkin]

@prajwal-koirala-0000, it works for Windows as well: https://github.com/vsafonkin/test-repo/runs/6173404643?check_suite_focus=true

[IvanZosimov]

Hello, @pantelis-karamolegkos 👋 Thank you and all others for contributing! We are closing this issue because this PR has been successfully merged. If you have any questions or additions feel free to ping us.

Cheers!