Add the parameter "atomic" to put() / _put(). If instructs the
implementation to take extra precautions to make sure the operation
either succeeds or fails entirely, i.e. doesn't leave a broken target
file behind.
Signed-off-by: Jan Lindemann <jan@janware.com>
Rename class FileTransfer to FileContext because that's the better
name. It's the base class of ExecContext and also a context.
Signed-off-by: Jan Lindemann <jan@janware.com>
Add class Curl as the first pure FileTransfer class without _run()
/ _sudo(). It doesn't use any PycURL / libcurl-like binding, but runs
the curl binary in a subprocess. That looks the most portable still.
Signed-off-by: Jan Lindemann <jan@janware.com>
