75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// +build linux darwin freebsd solaris
|
|
|
|
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package devices
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"syscall"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
func DeviceInfo(fi os.FileInfo) (uint64, uint64, error) {
|
|
sys, ok := fi.Sys().(*syscall.Stat_t)
|
|
if !ok {
|
|
return 0, 0, fmt.Errorf("cannot extract device from os.FileInfo")
|
|
}
|
|
|
|
dev := uint64(sys.Rdev)
|
|
return uint64(unix.Major(dev)), uint64(unix.Minor(dev)), nil
|
|
}
|
|
|
|
// mknod provides a shortcut for syscall.Mknod
|
|
func Mknod(p string, mode os.FileMode, maj, min int) error {
|
|
var (
|
|
m = syscallMode(mode.Perm())
|
|
dev uint64
|
|
)
|
|
|
|
if mode&os.ModeDevice != 0 {
|
|
dev = unix.Mkdev(uint32(maj), uint32(min))
|
|
|
|
if mode&os.ModeCharDevice != 0 {
|
|
m |= unix.S_IFCHR
|
|
} else {
|
|
m |= unix.S_IFBLK
|
|
}
|
|
} else if mode&os.ModeNamedPipe != 0 {
|
|
m |= unix.S_IFIFO
|
|
}
|
|
|
|
return unix.Mknod(p, m, int(dev))
|
|
}
|
|
|
|
// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
|
|
func syscallMode(i os.FileMode) (o uint32) {
|
|
o |= uint32(i.Perm())
|
|
if i&os.ModeSetuid != 0 {
|
|
o |= unix.S_ISUID
|
|
}
|
|
if i&os.ModeSetgid != 0 {
|
|
o |= unix.S_ISGID
|
|
}
|
|
if i&os.ModeSticky != 0 {
|
|
o |= unix.S_ISVTX
|
|
}
|
|
return
|
|
}
|