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|
package sandbox
import (
"errors"
"io/fs"
"os"
"path"
"strings"
"syscall"
)
const (
hostPath = "/" + hostDir
hostDir = "host"
sysrootPath = "/" + sysrootDir
sysrootDir = "sysroot"
)
func toSysroot(name string) string {
name = strings.TrimLeftFunc(name, func(r rune) bool { return r == '/' })
return path.Join(sysrootPath, name)
}
func toHost(name string) string {
name = strings.TrimLeftFunc(name, func(r rune) bool { return r == '/' })
return path.Join(hostPath, name)
}
func realpathHost(name string) (string, error) {
source := toHost(name)
rp, err := os.Readlink(source)
if err != nil {
if errors.Is(err, syscall.EINVAL) {
// not a symlink
return name, nil
}
return "", err
}
if !path.IsAbs(rp) {
return name, nil
}
msg.Verbosef("path %q resolves to %q", name, rp)
return rp, nil
}
func createFile(name string, perm os.FileMode, content []byte) error {
if err := os.MkdirAll(path.Dir(name), 0755); err != nil {
return err
}
f, err := os.OpenFile(name, syscall.O_CREAT|syscall.O_EXCL|syscall.O_WRONLY, perm)
if err != nil {
return err
}
if content != nil {
_, err = f.Write(content)
}
return errors.Join(f.Close(), err)
}
func ensureFile(name string, perm os.FileMode) error {
fi, err := os.Stat(name)
if err != nil {
if !os.IsNotExist(err) {
return err
}
return createFile(name, perm, nil)
}
if mode := fi.Mode(); mode&fs.ModeDir != 0 || mode&fs.ModeSymlink != 0 {
err = syscall.EISDIR
}
return err
}
|
