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//go:build !windows
// +build !windows
package archutil
import (
"bytes"
"compress/gzip"
"io"
"os"
"os/exec"
"path/filepath"
"syscall"
"github.com/pkg/errors"
)
func withChroot(cmd *exec.Cmd, dir string) {
cmd.SysProcAttr = &syscall.SysProcAttr{
Chroot: dir,
}
}
func check(arch, bin string) (string, error) {
tmpdir, err := os.MkdirTemp("", "qemu-check")
if err != nil {
return "", err
}
defer os.RemoveAll(tmpdir)
pp := filepath.Join(tmpdir, "check")
r, err := gzip.NewReader(bytes.NewReader([]byte(bin)))
if err != nil {
return "", err
}
defer r.Close()
f, err := os.OpenFile(pp, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0700)
if err != nil {
return "", err
}
//nolint:gosec // inputs should be static strings
if _, err := io.Copy(f, r); err != nil {
f.Close()
return "", err
}
f.Close()
cmd := exec.Command("/check")
withChroot(cmd, tmpdir)
err = cmd.Run()
if arch != "amd64" {
return "", err
}
// special handling for amd64. Exit code is 64 + amd64 variant
if err == nil {
return "", errors.Errorf("invalid zero exit code")
}
if exitError, ok := err.(*exec.ExitError); ok {
switch exitError.ExitCode() {
case 65:
return "v1", nil
case 66:
return "v2", nil
}
}
return "", err
}
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