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cmd/go: build fails in Plan 9 under /n #27074

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fhs opened this issue Aug 18, 2018 · 2 comments
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cmd/go: build fails in Plan 9 under /n #27074

fhs opened this issue Aug 18, 2018 · 2 comments
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FrozenDueToAge OS-Plan9
Milestone
Go1.12

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@fhs
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fhs commented Aug 18, 2018

What version of Go are you using (go version)?

master (64fae25)

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

plan9/amd64

What did you do?

cpu% cd /n/go-plan9/src
cpu% ./all.rc

What did you expect to see?

successful build

What did you see instead?

Building Go cmd/dist using /mnt/term/home/big/go-plan9-amd64-bootstrap
Building Go toolchain1 using /mnt/term/home/big/go-plan9-amd64-bootstrap.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
go: cannot determine module path for source directory /n (outside GOPATH, no import comments)
go tool dist: FAILED: /n/go-plan9/pkg/tool/plan9_amd64/go_bootstrap install -gcflags=all= -ldflags=all= -i cmd/asm cmd/cgo cmd/compile cmd/link: exit status: 'go_bootstrap 1770: 1'

It's failing because go command found /n/go.mod when looking for a go.mod file, but it's an automatically created empty directory. In Plan 9, directories in /n are automatically created when accessed. Go command should check /n/go.mod is not a directory. I will send CL soon.
@gopherbot
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Change https://golang.org/cl/129804 mentions this issue: cmd/go/internal/modload: ignore directories when looking for go.mod file

@fhs fhs changed the title Module build fails in Plan 9 under /n cmd/go: build fails in Plan 9 under /n Aug 18, 2018
@bradfitz bradfitz added this to the Go1.12 milestone Aug 20, 2018
@bradfitz
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/cc @0intro

@golang golang locked and limited conversation to collaborators Aug 20, 2019
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@bradfitz @fhs @gopherbot