1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
package container
import (
"errors"
"io/fs"
"os"
"path"
"strconv"
"strings"
"syscall"
"hakurei.app/container/fhs"
"hakurei.app/container/vfs"
)
const (
// Nonexistent is a path that cannot exist.
// /proc is chosen because a system with covered /proc is unsupported by this package.
Nonexistent = fhs.Proc + "nonexistent"
hostPath = fhs.Root + hostDir
hostDir = "host"
sysrootPath = fhs.Root + 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 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, 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 = &os.PathError{Op: "ensure", Path: name, Err: syscall.EISDIR}
}
return err
}
var hostProc = newProcPaths(direct{}, hostPath)
func newProcPaths(k syscallDispatcher, prefix string) *procPaths {
return &procPaths{k, prefix + "/proc", prefix + "/proc/self"}
}
type procPaths struct {
k syscallDispatcher
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 := p.k.openNew(p.self + "/mountinfo"); err != nil {
return err
} else {
d := vfs.NewMountInfoDecoder(r)
err0 := f(d)
if err = r.Close(); err != nil {
return err
} else if err = d.Err(); err != nil {
return err
}
return err0
}
}
|
