cmd/go: project depending on project using modules not building: "error loading module requirements"

[sab84]

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

$ go version
go version go1.12.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/me/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/me/localrepo"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.4/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.4/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/me/golangrepo/content-config/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/0d/wcqqd_f523b517dqn0ghdwqc1qjkyx/T/go-build771363169=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I have a project "a", which uses modules, that has dependency on code that is another project "b" which uses modules.

go.mod line # 1 in project "b":
module <private_gitlab_repo>/<group>/<subgroup>/<project "b" name>

import statement in project "a":
"<private_gitlab_repo>/<group>/<subgroup>/<project "b" name>.git/internal/parser"

What did you expect to see?

go build should complete correctly

What did you see instead?

go: <private_gitlab_repo>/<group>/<subgroup>/<project "b" name>.git@v0.0.0-20190508223317-420ea8aa2597: parsing go.mod: unexpected module path "<private_gitlab_repo>/<group>/<subgroup>/<project "b" name>" go: error loading module requirements

What am I doing wrong ?

[beoran]

I think you don't need the .git in the import statement.

[sab84]

@beoran , that didn't work either.

build <private_gitlab_repo>/<group>/<subgroup>/<project "a">: cannot load <private_gitlab_repo>/<group>/<subgroup>/<project "b">/internal/parser: cannot find module providing package <private_gitlab_repo>/<group>/<subgroup>/<project "b">/internal/parser

[sab84]

Also, I am able to depend on other internal project with the ".git" in the import statement and the go build command correctly updated the mod file with the project reference. The only difference is that this third project is not using modules.

[andybons]

@jayconrod @bcmills

[bcmills]

The path-mismatch error is due to the lack of .git suffix in the module directive.
The cannot find module providing package error is #26232.

This looks like a duplicate of #26232. In the interim, you should be able to work around it using:

replace <private_gitlab_repo>/<group>/<subgroup>/a v0.0.0-20190508223317-420ea8aa2597 => <private_gitlab_repo>/<group>/<subgroup>/a.git v0.0.0-20190508223317-420ea8aa2597

[bcmills]

Actually, for GitLab specifically this is #29888.

[bcmills]

Duplicate of #29888