2ebe3ba361
The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. [1]: https://golang.org/doc/go1.16#ioutil Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
//go:build darwin
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// +build darwin
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package tools
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import (
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/git-lfs/git-lfs/v3/errors"
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"github.com/git-lfs/git-lfs/v3/tr"
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"golang.org/x/sys/unix"
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)
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var cloneFileSupported bool
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func init() {
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cloneFileSupported = checkCloneFileSupported()
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}
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// checkCloneFileSupported return iff Mac OS version is greater or equal to 10.12.x Sierra.
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//
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// clonefile is supported since Mac OS X 10.12
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// https://www.manpagez.com/man/2/clonefile/
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//
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// kern.osrelease mapping
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// 17.x.x. macOS 10.13.x High Sierra.
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// 16.x.x macOS 10.12.x Sierra.
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// 15.x.x OS X 10.11.x El Capitan.
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func checkCloneFileSupported() bool {
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bytes, err := unix.Sysctl("kern.osrelease")
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if err != nil {
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return false
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}
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versionString := strings.Split(string(bytes), ".") // major.minor.patch
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if len(versionString) < 2 {
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return false
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}
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major, err := strconv.Atoi(versionString[0])
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if err != nil {
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return false
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}
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return major >= 16
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}
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// CheckCloneFileSupported runs explicit test of clone file on supplied directory.
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// This function creates some (src and dst) file in the directory and remove after test finished.
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//
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// If check failed (e.g. directory is read-only), returns err.
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func CheckCloneFileSupported(dir string) (supported bool, err error) {
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if !cloneFileSupported {
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return false, errors.New(tr.Tr.Get("Unsupported OS version. 10.12.x Sierra or higher required."))
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}
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src, err := os.CreateTemp(dir, "src")
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if err != nil {
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return false, err
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}
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defer os.Remove(src.Name())
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dst, err := os.CreateTemp(dir, "dst")
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if err != nil {
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return false, err
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}
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defer os.Remove(dst.Name())
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return CloneFileByPath(dst.Name(), src.Name())
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}
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type CloneFileError struct {
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Unsupported bool
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errorString string
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}
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func (c *CloneFileError) Error() string {
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return c.errorString
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}
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func CloneFile(_ io.Writer, _ io.Reader) (bool, error) {
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return false, nil // Cloning from io.Writer(file descriptor) is not supported by Darwin.
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}
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func CloneFileByPath(dst, src string) (bool, error) {
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if !cloneFileSupported {
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return false, &CloneFileError{Unsupported: true, errorString: tr.Tr.Get("clonefile is not supported")}
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}
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if FileExists(dst) {
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if err := os.Remove(dst); err != nil {
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return false, err // File should be not exists before create
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}
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}
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if err := cloneFileSyscall(dst, src); err != nil {
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return false, err
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}
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return true, nil
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}
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func cloneFileSyscall(dst, src string) *CloneFileError {
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err := unix.Clonefileat(unix.AT_FDCWD, src, unix.AT_FDCWD, dst, unix.CLONE_NOFOLLOW)
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if err != nil {
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return &CloneFileError{
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Unsupported: err == unix.ENOTSUP,
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errorString: tr.Tr.Get("error cloning from %v to %v: %s", src, dst, err),
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}
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}
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return nil
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}
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