cmd/go: errors while testing go modules

[SuchithArodi]

Please answer these questions before submitting your issue. Thanks!

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

$ go version
go version go1.11 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/sarodi/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/sarodi/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.11/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.11/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/sarodi/temp/stream-service/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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build557600271=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Trying the new go modules.
Currently, the repo uses the dep and I want to move from dep to go modules.

Steps followed to move to go modules from dep (As described in https://github.com/golang/go/wiki/Modules):

1. In the project root directory create the mod file go.mod: go mod init (This will read from the Gopkg.lock file for all the dependency information)
2. Build the module. This will create a go.sum file in the root directory: go build ./...
3. Test the module: go test ./...

It builds fine, but when I do go test ./... I see this error.

$ go test ./...
# /Users/sarodi/temp/stream-service/pkg/txhandler.test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b391/_testmain.go:12:2: import path cannot be absolute path
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b391/_testmain.go:20:24: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b391/_testmain.go:22:21: undefined: _test
# /Users/sarodi/temp/stream-service/pkg/util.test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b394/_testmain.go:12:2: import path cannot be absolute path
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b394/_testmain.go:20:21: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b394/_testmain.go:22:20: undefined: _test
# /Users/sarodi/temp/stream-service/pkg/controller.test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:12:2: import path cannot be absolute path
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:20:19: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:22:17: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:24:17: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:26:16: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:28:25: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:30:18: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:32:25: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:34:22: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:36:18: undefined: _test
/var/folders/5g/yq5b2dfd7bgf424t0ff3dcmc0000gn/T/go-build102201698/b372/_testmain.go:36:18: too many errors
?   	/Users/sarodi/temp/stream-service/cmd/streamservice	[no test files]
FAIL	/Users/sarodi/temp/stream-service/pkg/controller [build failed]
?   	/Users/sarodi/temp/stream-service/pkg/mocks	[no test files]
FAIL	/Users/sarodi/temp/stream-service/pkg/txhandler [build failed]
FAIL	/Users/sarodi/temp/stream-service/pkg/util [build failed]

when I do 'go test all' I see this error:

$ go test all
go: finding github.com/pierrec/lz4/v2/internal/xxh32 latest
go: finding github.com/onsi/ginkgo/extensions/table latest
go: finding github.com/Shopify/toxiproxy/client latest
go: finding github.com/pierrec/lz4/v2/internal latest
go: downloading github.com/pierrec/lz4/v2 v2.0.7
go: finding github.com/onsi/ginkgo/extensions latest
can't load package: package github.com/pierrec/lz4/v2/internal/xxh32: unknown import path "github.com/pierrec/lz4/v2/internal/xxh32": cannot find module providing package github.com/pierrec/lz4/v2/internal/xxh32

What did you expect to see?

I expected the transition from dep to go mod with ease.

What did you see instead?

Errors !

[bcmills]

The first error message says import path cannot be absolute path. Does your code have an import statement that uses an absolute path?

[bcmills]

The second error message seems to be accurate. It says cannot find module providing package github.com/pierrec/lz4/v2/internal/xxh32. If we look at the latest v2 tag for that repository (v2.0.7), we find that it declares its module to be github.com/pierrec/lz4 (note the lack of /v2).

See also pierrec/lz4#33.

[SuchithArodi]

The first error message says import path cannot be absolute path. Does your code have an import statement that uses an absolute path?

I am not aware of any absolute paths in the import statements other than "github.com/...". Basically, all the import paths I see starts with "github.com/..." or a similar github private repo. I have "sync", "time", "container/list" but these are golang packages.

May be it is complaining about the absolute path in some dependency which I use ?

[bcmills]

Possibly. Can you attach a code sample and exact commands to reproduce the error?

[SuchithArodi]

So, while initiating the mod I was giving an absolute path for the module like 'go mod init /user/temp' this was the cause of the first error!

Now, when I change the module path to something else like 'go mod init user/temp' it works fine.
Can you please direct me to some resources where I can learn how exactly the go modules works internally.

But, if I do 'go test all' I still see this error which is expected as you mentioned earlier.

$ go test all
go: finding github.com/pierrec/lz4/v2/internal/xxh32 latest
go: finding github.com/Shopify/toxiproxy/client latest
go: finding github.com/onsi/ginkgo/extensions/table latest
go: finding github.com/pierrec/lz4/v2/internal latest
go: downloading github.com/pierrec/lz4/v2 v2.0.7
go: finding github.com/onsi/ginkgo/extensions latest
can't load package: package github.com/pierrec/lz4/v2/internal/xxh32: unknown import path "github.com/pierrec/lz4/v2/internal/xxh32": cannot find module providing package github.com/pierrec/lz4/v2/internal/xxh32

[agnivade]

The v2 change has been reverted for that repo - pierrec/lz4@bb6bfd1. You can remove that. The repo README is out of date.

Please see this https://golang.org/cmd/go/#hdr-Module_maintenance for more info.

[bcmills]

It appears that all of the errors are now accounted for. Is there anything more to do?

[rsc]

Closing this issue as fixed in part and covered by #28389 for the rest.