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cmd/go: directory named go.mod defines new module but is otherwise ignored #30788

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heschik opened this issue Mar 12, 2019 · 4 comments
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cmd/go: directory named go.mod defines new module but is otherwise ignored #30788

heschik opened this issue Mar 12, 2019 · 4 comments

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@heschik
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@heschik heschik commented Mar 12, 2019

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

go version devel +ee6bec958d Fri Mar 1 18:35:31 2019 +0000 linux/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

I have no idea how I ended up with a go.mod directory, but I did. I discovered this in x/tools so that's where the repro is.

tools/imports (master)$ git reset --hard
HEAD is now at e65039ee internal/lsp: make sure completion items are never null
tools/imports (master)$ GO111MODULE=on go list .  
golang.org/x/tools/imports
tools/imports (master)$ mkdir go.mod
tools/imports (master)$ GO111MODULE=on go list .
go: finding golang.org/x/tools/imports latest
can't load package: package golang.org/x/tools/imports: unknown import path "golang.org/x/tools/imports": cannot find module providing package golang.org/x/tools/imports
tools/imports (master)$ GO111MODULE=on go mod tidy
go: finding golang.org/x/tools/imports latest
tools/imports (master)$ echo $?
0
tools/imports (master)$ echo 'module golang.org/x/tools' > ../go.mod
tools/imports (master*)$ GO111MODULE=on go mod tidy
tools/imports (master*)$ GO111MODULE=on go mod tidy                  
[snip]
tools/imports (master*)$ cat ../go.mod
module golang.org/x/tools

go 1.12

require golang.org/x/net v0.0.0-20190311183353-d8887717615a

The way it's ignored by tidy is strange; I imagine there are two code paths for finding go.mod and only one of them checks whether the file is a regular file. This is particularly confusing since Git won't show you an empty directory in git status.

@bcmills

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@bcmills bcmills commented Mar 13, 2019

I imagine there are two code paths for finding go.mod and only one of them checks whether the file is a regular file.

Three, actually. And you're right that only one of them checks for a file vs. a directory:

if fi, err := os.Stat(filepath.Join(dir, "go.mod")); err == nil && !fi.IsDir() {

if _, err := os.Stat(filepath.Join(path, "go.mod")); err == nil {

_, err := os.Stat(filepath.Join(d, "go.mod"))

@bcmills

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@bcmills bcmills commented Mar 13, 2019

Make that four. And two of them check.

go/src/go/build/build.go

Lines 1042 to 1043 in 5f40351

info, err := os.Stat(filepath.Join(abs, "go.mod"))
if err == nil && !info.IsDir() {

@bcmills

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@bcmills bcmills commented Mar 13, 2019

Five.

if _, err := os.Stat(filepath.Join(path, "go.mod")); err == nil {

@gopherbot

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@gopherbot gopherbot commented Mar 14, 2019

Change https://golang.org/cl/167393 mentions this issue: cmd: ignore the directory named go.mod

@gopherbot gopherbot closed this in fa5dbd0 Mar 28, 2019
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