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cmd/go: add mod tidy -check #27005

fishy opened this Issue Aug 15, 2018 · 5 comments


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7 participants

fishy commented Aug 15, 2018

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.11rc1 darwin/amd64

Does this issue reproduce with the latest release?


What operating system and processor architecture are you using (go env)?


What did you do?

  • Remove lines from go.mod and go.sum files
  • Run go mod tidy to add them back

What did you expect to see?

go mod tidy should return non-zero as it made changes. This way it could be integrated to tools like pre-commit hooks to make sure that we don't commit untidied go.mod and go.sum files into version control

What did you see instead?

go mod tidy returned zero


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mvdan commented Aug 15, 2018

Non-zero exit codes are usually for errors, so having it behave like this by default would be counter-intuitive.

Perhaps it could have something similar to gofmt, which has the -l and -d flags to tell if any changes were made.


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swtch1 commented Aug 15, 2018

If the files are successfully added why wouldn't you want to see a 0 status code? This means that the following script would fail:

#!/usr/bin/env bash
set -e
go mod tidy  # <-- non 0 return code
echo 'we never get here'

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fishy commented Aug 15, 2018

That makes sense. How about maybe make it optional? e.g. when it's executed with a flag it should return non-zero when it made any changes.


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thepudds commented Aug 15, 2018

@gopherbot, please add label modules

@gopherbot gopherbot added the modules label Aug 15, 2018

@rsc rsc changed the title from modules: `go mod tidy` should return non-zero when it made changes to go.mod and/or go.sum files to cmd/go: add mod tidy -check Aug 18, 2018


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rsc commented Aug 18, 2018

We could think about adding a flag that means "don't do the update, but fail if one is needed".
Not sure exactly what to call it but I put -check in the description. Needs more thought.

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