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cmd/go: when 'go build' run in directory with go.mod and no .go files: "cannot find module for path ." #35414

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GingerMoon opened this issue Nov 7, 2019 · 4 comments
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cmd/go: when 'go build' run in directory with go.mod and no .go files: "cannot find module for path ." #35414

GingerMoon opened this issue Nov 7, 2019 · 4 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.
Milestone
Go1.14

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

go version go1.12.2 linux/amd64

Does this issue reproduce with the latest release?

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

go env Output
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"

What did you do?

I want to put several common modules into one repo.
So the repo layout looks like below:

common-modules/
        |-- module1/
                |-- *.go files
        |-- module2/
                |-- *.go files
        go.mod

The go.mod file looks like:

module company1.com/common-modules

go 1.12

Run "go build" under directory common-modules.

What did you expect to see?

No error is returned.

What did you see instead?

If I run "go build" under directory common-modules, error returns:
can't load package: package company1.com/common-modules: unknown import path "company1.com/common-modules": cannot find module providing package company1.com/common-modules
@ianlancetaylor ianlancetaylor changed the title Run "go build" in an directory which contains only go.mod (no other go files) returns error: can't load package unknown import path cmd/go: Run "go build" in an directory which contains only go.mod (no other go files) returns error: can't load package unknown import path Nov 7, 2019
@ianlancetaylor ianlancetaylor added modules NeedsFix The path to resolution is known, but the work has not been done. labels Nov 7, 2019
@ianlancetaylor ianlancetaylor added this to the Go1.14 milestone Nov 7, 2019
@ianlancetaylor
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CC @bcmills @jayconrod

@bcmills
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bcmills commented Nov 8, 2019

go version go1.12.2

I believe we fixed some related bugs in 1.13. What happens if you try this with the current release (Go 1.13.4)?

@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. labels Nov 8, 2019
@gopherbot gopherbot removed the NeedsFix The path to resolution is known, but the work has not been done. label Nov 8, 2019
@GingerMoon
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Hi @bcmills
The result is the same for 1.13.4:

[myname@mycompany myproject]$ ll
total 4
drwxrwxr-x. 5 myname myname 100 Nov 11 10:40 fe3
-rw-rw-r--. 1 myname myname 47 Nov 11 10:40 go.mod
drwxrwxr-x. 6 myname myname 107 Nov 7 20:04 ll3
[myname@mycompany myproject]$ go build
build .: cannot find module for path .
[myname@mycompany myproject]$ cat go.mod
module git.mycompany.com/cloud/myproject

go 1.13
[myname@mycompany myproject]$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/myname/.cache/go-build"
GOENV="/home/myname/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/myname/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/gorootpath/go-1.13.4"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/gorootpath/go-1.13.4/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/myname/myproject/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build343362267=/tmp/go-build -gno-record-gcc-switches"
[myname@mycompany myproject]$ go build
build .: cannot find module for path .

@jayconrod jayconrod changed the title cmd/go: Run "go build" in an directory which contains only go.mod (no other go files) returns error: can't load package unknown import path cmd/go: when 'go build' run in directory with go.mod and no .go files: "cannot find module for path ." Nov 11, 2019
@jayconrod jayconrod removed the WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. label Nov 11, 2019
@jayconrod jayconrod self-assigned this Nov 13, 2019
@gopherbot
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Change https://golang.org/cl/206902 mentions this issue: cmd/go: fix error for empty packages referenced with relative paths

@nmiyake nmiyake mentioned this issue Dec 6, 2019
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@golang golang locked and limited conversation to collaborators Nov 12, 2020
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@jayconrod @ianlancetaylor @bcmills @GingerMoon @gopherbot