ff97759057
Use the IoctlFileClone ioctl wrapper provided by golang.org/x/sys/unix instead of locally implementing it. This also fixes the ioctl on GOARCHes where the value of FICLONE is different from the currently used ioctlFiClone value (e.g. mips64/mips64le and ppc64/ppc64le). This PR also bumps the version of golang.org/x/sys to get IoctlFileClone and updates its vendored version by running `go get golang.org/x/sys@latest && go mod tidy && go mod vendor`.
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// +build linux
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package tools
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import (
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"io"
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"io/ioutil"
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"os"
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"golang.org/x/sys/unix"
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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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src, err := ioutil.TempFile(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 := ioutil.TempFile(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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if ok, err := CloneFile(dst, src); err != nil {
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return false, err
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} else {
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return ok, nil
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}
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}
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func CloneFile(writer io.Writer, reader io.Reader) (bool, error) {
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fdst, fdstFound := writer.(*os.File)
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fsrc, fsrcFound := reader.(*os.File)
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if fdstFound && fsrcFound {
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if err := unix.IoctlFileClone(int(fdst.Fd()), int(fsrc.Fd())); 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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return false, nil
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}
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func CloneFileByPath(dst, src string) (bool, error) {
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srcFile, err := os.Open(src)
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if err != nil {
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return false, err
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}
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dstFile, err := os.Create(dst) //truncating, it if it already exists.
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if err != nil {
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return false, err
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}
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return CloneFile(dstFile, srcFile)
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}
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