forked from mirrors/tar-split
92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
package verify
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/*
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Lgetxattr and Lsetxattr are copied directly from https://github.com/docker/docker
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./pkg/system/xattr_linux.go commit 7e420ad8502089e66ce0ade92bf70574f894f287
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Apache License Version 2.0, January 2004 https://www.apache.org/licenses/
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Copyright 2013-2015 Docker, Inc.
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*/
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import (
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"bytes"
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"syscall"
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"unsafe"
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)
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// Listxattr is a helper around the syscall.Listxattr
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func Listxattr(path string) ([]string, error) {
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buf := make([]byte, 1024)
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sz, err := syscall.Listxattr(path, buf)
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if err == syscall.ENODATA {
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return nil, nil
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}
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if err == syscall.ERANGE && sz > 0 {
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buf = make([]byte, sz)
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sz, err = syscall.Listxattr(path, buf)
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}
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keys := []string{}
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for _, key := range bytes.Split(bytes.Trim(buf, "\x00"), []byte{0x0}) {
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if string(key) != "" {
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keys = append(keys, string(key))
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}
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}
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return keys, nil
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}
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// Lgetxattr retrieves the value of the extended attribute identified by attr
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// and associated with the given path in the file system.
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// It will returns a nil slice and nil error if the xattr is not set.
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func Lgetxattr(path string, attr string) ([]byte, error) {
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pathBytes, err := syscall.BytePtrFromString(path)
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if err != nil {
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return nil, err
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}
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attrBytes, err := syscall.BytePtrFromString(attr)
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if err != nil {
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return nil, err
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}
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dest := make([]byte, 128)
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destBytes := unsafe.Pointer(&dest[0])
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sz, _, errno := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
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if errno == syscall.ENODATA {
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return nil, nil
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}
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if errno == syscall.ERANGE {
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dest = make([]byte, sz)
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destBytes := unsafe.Pointer(&dest[0])
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sz, _, errno = syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(destBytes), uintptr(len(dest)), 0, 0)
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}
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if errno != 0 {
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return nil, errno
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}
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return dest[:sz], nil
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}
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var _zero uintptr
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// Lsetxattr sets the value of the extended attribute identified by attr
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// and associated with the given path in the file system.
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func Lsetxattr(path string, attr string, data []byte, flags int) error {
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pathBytes, err := syscall.BytePtrFromString(path)
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if err != nil {
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return err
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}
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attrBytes, err := syscall.BytePtrFromString(attr)
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if err != nil {
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return err
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}
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var dataBytes unsafe.Pointer
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if len(data) > 0 {
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dataBytes = unsafe.Pointer(&data[0])
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} else {
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dataBytes = unsafe.Pointer(&_zero)
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}
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_, _, errno := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(pathBytes)), uintptr(unsafe.Pointer(attrBytes)), uintptr(dataBytes), uintptr(len(data)), uintptr(flags), 0)
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if errno != 0 {
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return errno
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}
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return nil
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}
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