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cmd/go: add mod tidy -check #27005

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fishy opened this Issue Aug 15, 2018 · 6 comments

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@fishy
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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?

N/A

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

GOARCH="amd64"
GOOS="darwin"

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

@mvdan

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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.

@swtch1

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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'
@fishy

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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.

@thepudds

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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 modules: `go mod tidy` should return non-zero when it made changes to go.mod and/or go.sum files 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.

@rsc rsc added this to the Go1.12 milestone Aug 18, 2018

@rsc rsc added the NeedsDecision label Aug 18, 2018

@bcmills bcmills modified the milestones: Go1.12, Go1.13 Oct 24, 2018

radeksimko added a commit to terraform-providers/terraform-provider-acme that referenced this issue Feb 19, 2019

Remove govendor references
 - 'go mod verify' is not that useful and isn't equivalent to govendor status.
 - 'go mod tidy -v' does not return non-zero exit code when dependencies aren't tidy
 - We might add 'go mod tidy -check' at some point, when it becomes a thing.
   See golang/go#27005
   Until then it's better to keep provider setup aligned though.
@nhooyr

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nhooyr commented Feb 25, 2019

@rsc regarding your comment in #26850

You could use 'go list all -mod=readonly' to check that at least for the current GOOS/GOARCH no changes are needed.

go list all -mod=readonly causes changes for me to go.sum without erroring.

Is this a bug?

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