cmd/go: go mod tidy ignores the go.work file

[perillo]

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

$ go version
go version go1.18beta2 linux/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
GO111MODULE="on"
GOARCH="amd64"
GOBIN="/home/manlio/.local/bin"
GOCACHE="/home/manlio/.cache/go-build"
GOENV="/home/manlio/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE="*.local"
GOMODCACHE="/home/manlio/.local/lib/go/pkg/mod"
GONOPROXY=""
GONOSUMDB="*.local"
GOOS="linux"
GOPATH="/home/manlio/.local/lib/go:/home/manlio/src/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/manlio/sdk/go1.18beta2"
GOSUMDB="sum.golang.org"
GOTMPDIR="/tmp/gotmp"
GOTOOLDIR="/home/manlio/sdk/go1.18beta2/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.18beta2"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
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/gotmp/go-build2069986986=/tmp/go-build -gno-record-gcc-switches"
GOROOT/bin/go version: go version go1.18beta2 linux/amd64
GOROOT/bin/go tool compile -V: compile version go1.18beta2
uname -sr: Linux 5.16.3-arch1-1
/usr/lib/libc.so.6: GNU C Library (GNU libc) release release version 2.33.
gdb --version: GNU gdb (GDB) 11.2

What did you do?

I have the following directory structure:

test.localhost/workspace/
    go.work
    main/
        go.mod
        main.go
    deps/
        go.mod
        deps.go

go.work:

go 1.18

use (
	deps
	main
)

main/go.mod:

module test.localhost/workspace/main

go 1.18

main/main.go:

package main

import (
	"fmt"

	"test.localhost/workspace/deps"
)

func main() {
	fmt.Println(deps.Do())
}

deps/go.mod:

module test.localhost/workspace/deps

go 1.18

deps/deps.go:

package deps

func Do() int {
	return 777
}

I ran, from the main directory, the command go mod tidy.

What did you expect to see?

Nothing.

What did you see instead?

The command ignored the go.work file and tried to fetch the test.localhost/workspace/deps module, failing with the error:

go: finding module for package test.localhost/workspace/deps
test.localhost/workspace/main imports
	test.localhost/workspace/deps: cannot find module providing package test.localhost/workspace/deps: unrecognized import path "test.localhost/workspace/deps": https fetch: Get "https://test.localhost/workspace/deps?go-get=1": dial tcp [::1]:443: connect: connection refused

[seankhliao]

Duplicate of #50750