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// Copyright 2018 Tobias Klauser. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// +build ignore
package main
import (
"fmt"
"go/format"
"io/ioutil"
"os"
"os/exec"
"regexp"
"runtime"
)
func gensysconf(in, out, goos, goarch string) error {
if _, err := os.Stat(in); err != nil {
if os.IsNotExist(err) {
return nil
} else {
return err
}
}
cmd := exec.Command("go", "tool", "cgo", "-godefs", in)
defer os.RemoveAll("_obj")
b, err := cmd.CombinedOutput()
if err != nil {
fmt.Fprintln(os.Stderr, string(b))
return err
}
goBuild, build := goos, goos
if goarch != "" {
goBuild = fmt.Sprintf("%s && %s", goos, goarch)
build = fmt.Sprintf("%s,%s", goos, goarch)
}
r := fmt.Sprintf(`$1
//go:build %s
// +build %s`, goBuild, build)
cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
b = cgoCommandRegex.ReplaceAll(b, []byte(r))
b, err = format.Source(b)
if err != nil {
return err
}
return ioutil.WriteFile(out, b, 0644)
}
func main() {
goos, goarch := runtime.GOOS, runtime.GOARCH
if goos == "illumos" {
goos = "solaris"
}
defs := fmt.Sprintf("sysconf_defs_%s.go", goos)
if err := gensysconf(defs, "z"+defs, goos, ""); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
vals := fmt.Sprintf("sysconf_values_%s.go", runtime.GOOS)
// sysconf variable values are GOARCH-specific, thus write per GOARCH
zvals := fmt.Sprintf("zsysconf_values_%s_%s.go", runtime.GOOS, runtime.GOARCH)
if err := gensysconf(vals, zvals, goos, goarch); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
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