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//go:build linux
// +build linux
package overlay2 // import "github.com/docker/docker/daemon/graphdriver/overlay2"
import (
"runtime"
"golang.org/x/sys/unix"
)
func mountFrom(dir, device, target, mType string, flags uintptr, label string) error {
chErr := make(chan error, 1)
go func() {
runtime.LockOSThread()
// Do not unlock this thread as the thread state cannot be restored
// We do not want go to re-use this thread for anything else.
if err := unix.Unshare(unix.CLONE_FS); err != nil {
chErr <- err
return
}
if err := unix.Chdir(dir); err != nil {
chErr <- err
return
}
chErr <- unix.Mount(device, target, mType, flags, label)
}()
return <-chErr
}
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