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package container
import (
"errors"
"fmt"
"io/fs"
"os"
"path"
"strconv"
"strings"
"syscall"
"hakurei.app/container/vfs"
)
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, pperm os.FileMode, content []byte) error {
if err := os.MkdirAll(path.Dir(name), pperm); err != nil {
return wrapErrSelf(err)
}
f, err := os.OpenFile(name, syscall.O_CREAT|syscall.O_EXCL|syscall.O_WRONLY, perm)
if err != nil {
return wrapErrSelf(err)
}
if content != nil {
_, err = f.Write(content)
if err != nil {
err = wrapErrSelf(err)
}
}
return errors.Join(f.Close(), err)
}
func ensureFile(name string, perm, pperm os.FileMode) error {
fi, err := os.Stat(name)
if err != nil {
if !os.IsNotExist(err) {
return err
}
return createFile(name, perm, pperm, 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 + "/proc", prefix + "/proc/self"}
}
type procPaths struct {
prefix string
self 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) }
func (p *procPaths) mountinfo(f func(d *vfs.MountInfoDecoder) error) error {
if r, err := os.Open(p.self + "/mountinfo"); err != nil {
return wrapErrSelf(err)
} else {
d := vfs.NewMountInfoDecoder(r)
err0 := f(d)
if err = r.Close(); err != nil {
return wrapErrSuffix(err,
"cannot close mountinfo:")
} else if err = d.Err(); err != nil {
return wrapErrSuffix(err,
"cannot parse mountinfo:")
}
return err0
}
}
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