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//go:build darwin
// +build darwin
package tools
import (
"io"
"os"
"strconv"
"strings"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/tr"
"golang.org/x/sys/unix"
)
var cloneFileSupported bool
func init() {
cloneFileSupported = checkCloneFileSupported()
}
// checkCloneFileSupported return iff Mac OS version is greater or equal to 10.12.x Sierra.
//
// clonefile is supported since Mac OS X 10.12
// https://www.manpagez.com/man/2/clonefile/
//
// kern.osrelease mapping
// 17.x.x. macOS 10.13.x High Sierra.
// 16.x.x macOS 10.12.x Sierra.
// 15.x.x OS X 10.11.x El Capitan.
func checkCloneFileSupported() bool {
bytes, err := unix.Sysctl("kern.osrelease")
if err != nil {
return false
}
versionString := strings.Split(string(bytes), ".") // major.minor.patch
if len(versionString) < 2 {
return false
}
major, err := strconv.Atoi(versionString[0])
if err != nil {
return false
}
return major >= 16
}
// CheckCloneFileSupported runs explicit test of clone file on supplied directory.
// This function creates some (src and dst) file in the directory and remove after test finished.
//
// If check failed (e.g. directory is read-only), returns err.
func CheckCloneFileSupported(dir string) (supported bool, err error) {
if !cloneFileSupported {
return false, errors.New(tr.Tr.Get("Unsupported OS version. 10.12.x Sierra or higher required."))
}
src, err := os.CreateTemp(dir, "src")
if err != nil {
return false, err
}
defer os.Remove(src.Name())
src.Close()
dst, err := os.CreateTemp(dir, "dst")
if err != nil {
return false, err
}
defer os.Remove(dst.Name())
dst.Close()
return CloneFileByPath(dst.Name(), src.Name())
}
type CloneFileError struct {
Unsupported bool
errorString string
}
func (c *CloneFileError) Error() string {
return c.errorString
}
func CloneFile(_ io.Writer, _ io.Reader) (bool, error) {
return false, nil // Cloning from io.Writer(file descriptor) is not supported by Darwin.
}
func CloneFileByPath(dst, src string) (bool, error) {
if !cloneFileSupported {
return false, &CloneFileError{Unsupported: true, errorString: tr.Tr.Get("clonefile is not supported")}
}
if FileExists(dst) {
if err := os.Remove(dst); err != nil {
return false, err // File should be not exists before create
}
}
if err := cloneFileSyscall(dst, src); err != nil {
return false, err
}
return true, nil
}
func cloneFileSyscall(dst, src string) *CloneFileError {
err := unix.Clonefileat(unix.AT_FDCWD, src, unix.AT_FDCWD, dst, unix.CLONE_NOFOLLOW)
if err != nil {
return &CloneFileError{
Unsupported: err == unix.ENOTSUP,
errorString: tr.Tr.Get("error cloning from %v to %v: %s", src, dst, err),
}
}
return nil
}
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