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