[short] skip

# If GOROOT is set, 'go build -trimpath' bakes that into the resulting
# binary. Explicitly unset it here.
env GOROOT=

# Set up two identical directories that can be used as GOPATH.
env GO111MODULE=on
mkdir $WORK/a/src/paths $WORK/b/src/paths
cp paths.go $WORK/a/src/paths
cp paths.go $WORK/b/src/paths
cp overlay.json $WORK/a/src/paths
cp overlay.json $WORK/b/src/paths
cp go.mod $WORK/a/src/paths/
cp go.mod $WORK/b/src/paths/


# A binary built without -trimpath should contain the module root dir
# and GOROOT for debugging and stack traces.
cd $WORK/a/src/paths
go build -o $WORK/paths-dbg.exe .
exec $WORK/paths-dbg.exe $WORK/paths-dbg.exe
stdout 'binary contains module root: true'
stdout 'binary contains an empty GOROOT'

# A binary built with -trimpath should not contain the current workspace.
go build -trimpath -o $WORK/paths-a.exe .
exec $WORK/paths-a.exe $WORK/paths-a.exe
stdout 'binary contains module root: false'
stdout 'binary contains an empty GOROOT'

# A binary from an external module built with -trimpath should not contain
# the current workspace or GOROOT.
go get rsc.io/fortune
go install -trimpath rsc.io/fortune
exec $WORK/paths-a.exe $GOPATH/bin/fortune$GOEXE
stdout 'binary contains module root: false'
stdout 'binary contains an empty GOROOT'
go mod edit -droprequire rsc.io/fortune

# Two binaries built from identical packages in different directories
# should be identical.
cd $WORK/b/src/paths
go build -trimpath -o $WORK/paths-b.exe
cmp -q $WORK/paths-a.exe $WORK/paths-b.exe


# Same sequence of tests but with overlays.
# A binary built without -trimpath should contain the module root dir
# and GOROOT for debugging and stack traces.
cd $WORK/a/src/paths
go build -overlay overlay.json -o $WORK/paths-dbg.exe ./overlaydir
exec $WORK/paths-dbg.exe $WORK/paths-dbg.exe
stdout 'binary contains module root: true'
stdout 'binary contains an empty GOROOT'

# A binary built with -trimpath should not contain the current workspace.
go build -overlay overlay.json -trimpath -o $WORK/paths-a.exe ./overlaydir
exec $WORK/paths-a.exe $WORK/paths-a.exe
stdout 'binary contains module root: false'
stdout 'binary contains an empty GOROOT'

# Two binaries built from identical packages in different directories
# should be identical.
cd $WORK/b/src/paths
go build -overlay overlay.json -trimpath -o $WORK/paths-b.exe ./overlaydir
cmp -q $WORK/paths-a.exe $WORK/paths-b.exe


# Same sequence of tests but in GOPATH mode.
# A binary built without -trimpath should contain GOPATH and GOROOT.
env GO111MODULE=off
cd $WORK
env GOPATH=$WORK/a
go build -o paths-dbg.exe paths
exec ./paths-dbg.exe paths-dbg.exe
stdout 'binary contains GOPATH: true'
stdout 'binary contains an empty GOROOT'

# A binary built with -trimpath should not contain GOPATH.
go build -trimpath -o paths-a.exe paths
exec ./paths-a.exe paths-a.exe
stdout 'binary contains GOPATH: false'
stdout 'binary contains an empty GOROOT'

# Two binaries built from identical packages in different GOPATH roots
# should be identical.
env GOPATH=$WORK/b
go build -trimpath -o paths-b.exe paths
cmp -q paths-a.exe paths-b.exe


# Same sequence of tests but with gccgo.
# gccgo does not support builds in module mode.
[!exec:gccgo] stop
[cross] stop  # gccgo can't necessarily cross-compile
env GOPATH=$WORK/a

# A binary built with gccgo without -trimpath should contain the current
# GOPATH and GOROOT.
go build -compiler=gccgo -o paths-dbg.exe paths
exec ./paths-dbg.exe paths-dbg.exe
stdout 'binary contains GOPATH: true'
stdout 'binary contains an empty GOROOT'

# gccgo doesn't load std from GOROOT.
# A binary built with gccgo with -trimpath should not contain GOPATH or GOROOT.
go build -compiler=gccgo -trimpath -o paths-a.exe paths
exec ./paths-a.exe paths-a.exe
stdout 'binary contains GOPATH: false'
stdout 'binary contains an empty GOROOT'

# Two binaries built from identical packages in different directories
# should be identical.
env GOPATH=$WORK/b
go build -compiler=gccgo -trimpath -o paths-b.exe paths
cmp -q paths-a.exe paths-b.exe

-- paths.go --
package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

func main() {
	exe := os.Args[1]
	data, err := ioutil.ReadFile(exe)
	if err != nil {
		log.Fatal(err)
	}

	if os.Getenv("GO111MODULE") == "on" {
		out, err := exec.Command("go", "env", "GOMOD").Output()
		if err != nil {
			log.Fatal(err)
		}
		modRoot := filepath.Dir(strings.TrimSpace(string(out)))
		check(data, "module root", modRoot)
	} else {
		check(data, "GOPATH", os.Getenv("GOPATH"))
	}
	check(data, "GOROOT", os.Getenv("GOROOT"))
}

func check(data []byte, desc, dir string) {
	if dir == "" {
		fmt.Printf("binary contains an empty %s\n", desc)
		return
	}
	containsDir := bytes.Contains(data, []byte(dir))
	containsSlashDir := bytes.Contains(data, []byte(filepath.ToSlash(dir)))
	fmt.Printf("binary contains %s: %v\n", desc, containsDir || containsSlashDir)
}
-- overlay.json --
{ "Replace": { "overlaydir/paths.go": "paths.go" } }
-- go.mod --
module paths

go 1.14