Convert a go.mod file into checked out dependencies

[Kevin Burke]

Hi,

Sometimes I just want to inspect third party code for a library, and/or edit it. 

I'm looking for a tool that will read all of the dependencies in a go.mod file and then check out all of the right versions of all of the source code into the right places in a $GOPATH. Does that exist? 

Failing that, is there a tool that will read a go.mod file and give me version information about each dependency? I see packages.Load, but that doesn't seem super targeted for the use case; if it's the best that exists then I'll probably make it work.

Kevin

[Robert Dionne]

https://go.dev/ref/mod#go-mod-vendor

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[Kevin Burke]

Ah, yes, that would work but wouldn't include the git history... 

[Dan Kortschak]

While not a tool, there is code that can be bent to this in
golang.org/x/pkgsite/internal/source. I used that to get repo
information for a tool to obtain homepage and issue page links from Go
executables[1]. You could easily extend that kind of approach to get
the actual repo at the relevant version.

[1]
https://github.com/kortschak/ugbt/blob/master/internal/modrepo/repo.go

[Paul Jolly]

Hi Kevin,

As I replied on Gophers Slack:

go list -m all will give you information about dependencies. Add -json
to give you that in a more easily parsed format.

https://github.com/rogpeppe/gohack can be used to do what you want
with respect to checking out from VCS using the -vcs flag in
combination with the GOHACK env var appropriate set for the module in
question.


Paul