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package sandbox
import (
"errors"
"fmt"
"io/fs"
"os"
"path"
"strconv"
"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 createFile(name string, perm os.FileMode, content []byte) error {
if err := os.MkdirAll(path.Dir(name), 0755); err != nil {
return msg.WrapErr(err, err.Error())
}
f, err := os.OpenFile(name, syscall.O_CREAT|syscall.O_EXCL|syscall.O_WRONLY, perm)
if err != nil {
return msg.WrapErr(err, err.Error())
}
if content != nil {
_, err = f.Write(content)
if err != nil {
err = msg.WrapErr(err, err.Error())
}
}
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 = msg.WrapErr(syscall.EISDIR,
fmt.Sprintf("path %q is a directory", name))
}
return err
}
var hostProc = newProcPats(hostPath)
func newProcPats(prefix string) *procPaths {
return &procPaths{prefix, prefix + "/self", prefix + "/self/mountinfo"}
}
type procPaths struct {
prefix string
self string
mountinfo string
}
func (p *procPaths) stdout() string { return p.self + "/fd/1" }
func (p *procPaths) fd(fd int) string { return p.self + "/fd/" + strconv.Itoa(fd) }
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