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cmd/go: fail if the user tries to modify the GOMOD environment variable #51217

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mvdan opened this issue Feb 15, 2022 · 5 comments · May be fixed by #51954
Open

cmd/go: fail if the user tries to modify the GOMOD environment variable #51217

mvdan opened this issue Feb 15, 2022 · 5 comments · May be fixed by #51954
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GoCommand cmd/go help wanted modules NeedsFix The path to resolution is known, but the work has not been done.
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@mvdan
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mvdan commented Feb 15, 2022

See #51171 (comment). The user likely wants to either use -modfile, or cd into the right directory to enter or leave a module. Right now, a command like GOMOD=foo.mod go list will happily ignore GOMOD=foo.mod.

cc @bcmills @matloob
@mvdan mvdan mentioned this issue Feb 15, 2022
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@bcmills bcmills added GoCommand cmd/go help wanted modules NeedsFix The path to resolution is known, but the work has not been done. labels Feb 15, 2022
@bcmills bcmills added this to the Backlog milestone Feb 15, 2022
@mvdan
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mvdan commented Feb 23, 2022 •
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Open question; if one does the equivalent of source <(go env) to import all of go env into the current shell environment (aka go env >env.txt && source env.txt), one can end up with the equivalent of GOMOD=${PWD}/go.mod. So perhaps we shouldn't fail if GOMOD is set but the path is precisely the same as the go.mod file we are meant to be using.

In other words: to ensure we don't error out when we don't really have to, we could only error if GOMOD is set to a path that means the user is trying to change what go.mod file we're meant to be using.

@bcmills
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bcmills commented Feb 23, 2022

Perhaps!

I have also argued in the past that we should actually allow the user to actually change the “main module” for a go invocation by setting GOMOD explicitly.
(That would be a bit, but not entirely, redundant with the -C flag proposed in #50332.)

@mvdan
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mvdan commented Feb 23, 2022

I'd also be fine with that :)

@bcmills bcmills mentioned this issue Mar 20, 2022
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@bstncartwright
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Is this available to be worked on? I'd love to pick this up as a new contributor. 😃

bstncartwright added a commit to bstncartwright/go that referenced this issue Mar 25, 2022
@bstncartwright
cmd/go: fail if the user tries to modify the GOMOD environment variable
fb311d8 
GOMOD was previously silently ignored. now fails if the user tries to modify
the GOMOD environment variable and it is not the same as the module file
that would be used.

Fixes golang#51217
@bstncartwright bstncartwright linked a pull request Mar 25, 2022 that will close this issue
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@gopherbot
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Change https://go.dev/cl/395915 mentions this issue: cmd/go: fail if the user tries to modify the GOMOD environment variable

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cmd/go: fail if the user tries to modify the GOMOD environment variable bstncartwright/go
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