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cmd/go: exclude $GOPATH/src/mod from “all” and “...” patterns in GOPATH mode #26401

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bcmills opened this issue Jul 16, 2018 · 10 comments
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cmd/go: exclude $GOPATH/src/mod from “all” and “...” patterns in GOPATH mode #26401

bcmills opened this issue Jul 16, 2018 · 10 comments
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FrozenDueToAge modules NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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Go1.11

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@bcmills
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bcmills commented Jul 16, 2018

After performing a go build in module mode, go build all in GOPATH mode emits a bunch of errors due to import path mismatches in $GOPATH/src/mod.

Since the code in $GOPATH/src/mod isn't intended to be buildable in GOPATH mode in the first place, we should explicitly ignore it.

~/src$ cd $GOPATH/src

~/src$ go get rsc.io/sampler

~/src$ pushd rsc.io/sampler
~/src/rsc.io/sampler ~/src

~/src/rsc.io/sampler$ GO111MODULE=on go build .
go: finding golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c
go: downloading golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c

~/src/rsc.io/sampler$ popd
~/src

~/src$ GO111MODULE=off go build all 2>&1 | grep mod/ | head -n 10
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/cases: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/cases"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/cmd/gotext: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/cmd/gotext"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate/build: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate/build"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate/tools/colcmp: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/collate/tools/colcmp"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/currency: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/currency"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding/charmap: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding/charmap"
can't load package: package mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding/htmlindex: disallowed import path "mod/golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c/encoding/htmlindex"

(CC: @rsc)
@bcmills bcmills added this to the Go1.11 milestone Jul 16, 2018
@bcmills bcmills changed the title cmd/go: exclude $GOPATH/src/mod from “all” pattern in GOPATH mode cmd/go: exclude $GOPATH/src/mod from “all” and “...” patterns in GOPATH mode Jul 16, 2018
@rsc
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rsc commented Jul 17, 2018

Yes, mod should just be invisible in GOPATH/src. That's in internal/search I think.

@rsc
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rsc commented Jul 17, 2018

We could plausibly backport the GOPATH/src/mod exclusion to Go 1.9 and Go 1.10 as well.

@gopherbot
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Change https://golang.org/cl/125675 mentions this issue: cmd/go: exclude import paths beginning with mod/ from patterns

@anacrolix
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Any reason this stuff can't go in $GOPATH/mod or something other than $GOPATH/src? I posted to golang-dev just now on this.

@davecheney
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davecheney commented Jul 25, 2018 via email

@anacrolix
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How do those people setting $GOPATH=$HOME rationalize pkg? .mod seems good if the existing tools work with that.

@bcmills
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bcmills commented Jul 25, 2018

How do those people setting $GOPATH=$HOME rationalize pkg?

I mostly close my eyes and pretend it isn't there. (And soon it won't be! See #4719.)

@anacrolix
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Regarding the CL: It would be nice if "mod" was a constant somewhere. Similarly for its use elsewhere in the code base.

@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jul 30, 2018
@bcmills
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bcmills commented Jul 30, 2018

On hold pending a decision on whether to move the module cache someplace where it would be ignored by default (outside of $GOPATH/src or in a subdirectory beginning with . or _).

@bcmills bcmills self-assigned this Jul 30, 2018
@gopherbot
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Change https://golang.org/cl/126755 mentions this issue: cmd/go: move module cache from $GOPATH/src/mod to $GOPATH/pkg/mod

@golang golang locked and limited conversation to collaborators Aug 1, 2019
@rsc rsc unassigned bcmills Jun 23, 2022
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