Make the toolchain's `go` binary available as a target (#3429)

This allows developers to use the `go` command provided by the
registered toolchain to e.g. add dependencies to `go.mod`. This ensures
that everyone uses the same version of Go and does not require a local
installation of Go.

1 files changed, 22 insertions, 0 deletions

diff --git a/go/tools/go_bin_runner/process.go b/go/tools/go_bin_runner/process.go
new file mode 100644
index 00000000..8b344c96
--- /dev/null
+++ b/go/tools/go_bin_runner/process.go
@@ -0,0 +1,22 @@
+//go:build !unix
+
+package main
+
+import (
+	"os"
+	"os/exec"
+)
+
+func ReplaceWithProcess(args, env []string) error {
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Env = env
+	err := cmd.Run()
+	if exitErr, ok := err.(*exec.ExitError); ok {
+		os.Exit(exitErr.ExitCode())
+	} else if err == nil {
+		os.Exit(0)
+	}
+	return err
+}