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package sandbox
/*
#include <stdlib.h>
#include <stdio.h>
#include <mntent.h>
const char *F_PROC_MOUNTS = "";
const char *F_SET_TYPE = "r";
*/
import "C"
import (
"fmt"
"iter"
"runtime"
"sync"
"unsafe"
)
type Mntent struct {
/* name of mounted filesystem */
FSName string `json:"fsname"`
/* filesystem path prefix */
Dir string `json:"dir"`
/* mount type (see mntent.h) */
Type string `json:"type"`
/* mount options (see mntent.h) */
Opts string `json:"opts"`
/* dump frequency in days */
Freq int `json:"freq"`
/* pass number on parallel fsck */
Passno int `json:"passno"`
}
func (e *Mntent) String() string {
return fmt.Sprintf("%s %s %s %s %d %d",
e.FSName, e.Dir, e.Type, e.Opts, e.Freq, e.Passno)
}
func (e *Mntent) Is(want *Mntent) bool {
if want == nil {
return e == nil
}
return (e.FSName == want.FSName || want.FSName == "\x00") &&
(e.Dir == want.Dir || want.Dir == "\x00") &&
(e.Type == want.Type || want.Type == "\x00") &&
(e.Opts == want.Opts || want.Opts == "\x00") &&
(e.Freq == want.Freq || want.Freq == -1) &&
(e.Passno == want.Passno || want.Passno == -1)
}
type MountsFile struct {
m *mounts
mu sync.Mutex
done bool
}
func OpenMounts(name string) (*MountsFile, error) {
f := new(MountsFile)
f.m = new(mounts)
f.m.p = name
return f, f.m.open()
}
func (f *MountsFile) Err() error { return f.m.Err() }
func (f *MountsFile) Entries() iter.Seq[*Mntent] {
return func(yield func(*Mntent) bool) {
f.mu.Lock()
defer f.mu.Unlock()
if f.done {
return
}
for f.m.scan() {
e := new(Mntent)
f.m.copy(e)
if !yield(e) {
return
}
}
f.done = true
f.m.close()
}
}
type mounts struct {
p string
f *C.FILE
mu sync.RWMutex
ent *C.struct_mntent
err error
}
func (m *mounts) open() error {
m.mu.Lock()
defer m.mu.Unlock()
if m.f != nil {
panic("open called twice")
}
if m.p == "" {
m.p = "/proc/mounts"
}
name := C.CString(m.p)
f, err := C.setmntent(name, C.F_SET_TYPE)
C.free(unsafe.Pointer(name))
if f == nil {
return err
}
m.f = f
runtime.SetFinalizer(m, (*mounts).close)
return err
}
func (m *mounts) close() {
m.mu.Lock()
defer m.mu.Unlock()
if m.f == nil {
panic("close called before open")
}
C.endmntent(m.f)
runtime.SetFinalizer(m, nil)
}
func (m *mounts) scan() bool {
m.mu.Lock()
defer m.mu.Unlock()
if m.f == nil {
panic("invalid file")
}
m.ent, m.err = C.getmntent(m.f)
return m.ent != nil
}
func (m *mounts) Err() error {
m.mu.RLock()
defer m.mu.RUnlock()
return m.err
}
func (m *mounts) copy(v *Mntent) {
m.mu.RLock()
defer m.mu.RUnlock()
if m.ent == nil {
panic("invalid entry")
}
v.FSName = C.GoString(m.ent.mnt_fsname)
v.Dir = C.GoString(m.ent.mnt_dir)
v.Type = C.GoString(m.ent.mnt_type)
v.Opts = C.GoString(m.ent.mnt_opts)
v.Freq = int(m.ent.mnt_freq)
v.Passno = int(m.ent.mnt_passno)
}
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