Replace modules from command line

[Peter Feichtinger]

Hi Go Nuts,

I have a rather unusual use case and I'm hoping for some input.

For testing purposes, I want to build a Go binary with different versions of one of its dependencies. The only way I could think of was to modify the go.mod file to add a replace directive with the version I want to test.

Instead I'd like to avoid having to modify the go.mod file during the build and specify the replacement on the command line instead, but I don't think that's possible.

Do you guys have any ideas on how else I might accomplish overriding a module version during build?

-- Peter

[Paul Jolly]

Take a look at go mod edit

https://golang.org/cmd/go/#hdr-Module_maintenance

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[Peter Feichtinger]

Thanks for that, this will come in handy for editing the go.mod file.

But I'd like to avoid editing the file at all.

On Monday, August 5, 2019 at 7:16:08 PM UTC+2, Paul Jolly wrote:

Take a look at go mod edit

https://golang.org/cmd/go/#hdr-Module_maintenance

On Mon, 5 Aug 2019, 18:45 Peter Feichtinger, <shi...@gmx.at> wrote:

Hi Go Nuts,

I have a rather unusual use case and I'm hoping for some input.

For testing purposes, I want to build a Go binary with different versions of one of its dependencies. The only way I could think of was to modify the go.mod file to add a replace directive with the version I want to test.

Instead I'd like to avoid having to modify the go.mod file during the build and specify the replacement on the command line instead, but I don't think that's possible.

Do you guys have any ideas on how else I might accomplish overriding a module version during build?

-- Peter

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[anderson...@onefootball.com]

go mod edit does the trick.

Try

go mod edit -replace=github.com/foo/barr=github.com/bar/foo


go mod edit -replace=github.com/foo/barr=github.com/bar/foo@12345567789

Best

Anderson

[anderson...@onefootball.com]

Ops, now really understood what you want...

Well, a not really elegant way could be to have it pointing to a local folder and change the content on the local folder. But I believe the go.sum would spot the difference and break the build.
But if you need to change the version, why cannot you change the go.mod?

best,

Anderson

[Paul Jolly]

You won't be able to avoid editing the go.mod - it's the starting point for all module resolution.

How about taking a copy of the original go.{mod,sum} and restoring them, or using git checkout . to trash unstaged changes?

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[Peter Feichtinger]

Yeah I was expecting that would be necessary. Thanks for your input anyway.

[Elias Naur]

I don't think it's possible today. There is an issue for it: https://github.com/golang/go/issues/26640

 - elias

[Peter Feichtinger]

This would do pretty much exactly what I want. I'll be watching that, thanks.