src/cmd/go/testdata/script/build_overlay.txt

[short] skip

# Test building in overlays.
# TODO(matloob): add a test case where the destination file in the replace map
#   isn't a go file. Either completely exclude that case in fs.IsDirWithGoFiles
#   if the compiler doesn't allow it, or test that it works all the way.

# The main package (m) is contained in an overlay. It imports m/dir2 which has one
# file in an overlay and one file outside the overlay, which in turn imports m/dir,
# which only has source files in the overlay.

cd m

! go build .
go build -overlay overlay.json -o main$GOEXE .
exec ./main$goexe
stdout '^hello$'

go build -overlay overlay.json -o print_abspath$GOEXE ./printpath
exec ./print_abspath$GOEXE
stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go

go build -overlay overlay.json -o print_trimpath$GOEXE -trimpath ./printpath
exec ./print_trimpath$GOEXE
stdout ^m[/\\]printpath[/\\]main.go

go build -overlay overlay.json -o print_trimpath_two_files$GOEXE printpath/main.go printpath/other.go
exec ./print_trimpath_two_files$GOEXE
stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go
stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]other.go

# Run same tests but with gccgo.
env GO111MODULE=off
[!exec:gccgo] stop

! go build -compiler=gccgo .
go build -compiler=gccgo -overlay overlay.json -o main_gccgo$GOEXE .
exec ./main_gccgo$goexe
stdout '^hello$'

go build -compiler=gccgo -overlay overlay.json -o print_abspath_gccgo$GOEXE ./printpath
exec ./print_abspath_gccgo$GOEXE
stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go

go build -compiler=gccgo -overlay overlay.json -o print_trimpath_gccgo$GOEXE -trimpath ./printpath
exec ./print_trimpath_gccgo$GOEXE
stdout ^\.[/\\]printpath[/\\]main.go

-- m/go.mod --
// TODO(matloob): how do overlays work with go.mod (especially if mod=readonly)
module m

go 1.16

-- m/dir2/h.go --
package dir2

func PrintMessage() {
	printMessage()
}
-- m/dir/foo.txt --
The build action code currently expects the package directory
to exist, so it can run the compiler in that directory.
TODO(matloob): Remove this requirement.
-- m/printpath/about.txt --
the actual code is in the overlay
-- m/overlay.json --
{
	"Replace": {
		"f.go": "overlay/f.go",
		"dir/g.go": "overlay/dir_g.go",
		"dir2/i.go": "overlay/dir2_i.go",
		"printpath/main.go": "overlay/printpath.go",
		"printpath/other.go": "overlay2/printpath2.go"
	}
}
-- m/overlay/f.go --
package main

import "m/dir2"

func main() {
	dir2.PrintMessage()
}
-- m/overlay/dir_g.go --
package dir

import "fmt"

func PrintMessage() {
	fmt.Println("hello")
}
-- m/overlay/printpath.go --
package main

import (
	"fmt"
	"path/filepath"
	"runtime"
)

func main() {
	_, file, _, _ := runtime.Caller(0)

	// Since https://golang.org/cl/214286, the runtime's debug paths are
	// slash-separated regardless of platform, so normalize them to system file
	// paths.
	fmt.Println(filepath.FromSlash(file))
}
-- m/overlay2/printpath2.go --
package main

import (
	"fmt"
	"path/filepath"
	"runtime"
)

func init() {
	_, file, _, _ := runtime.Caller(0)
	fmt.Println(filepath.FromSlash(file))
}
-- m/overlay/dir2_i.go --
package dir2

import "m/dir"

func printMessage() {
	dir.PrintMessage()
}