$ git clone -n https://src.fedoraproject.org/rpms/chntpw.git /var/lib/mock/f41-build-830929-156786/root/chroot_tmpdir/scmroot/chntpw
Cloning into '/var/lib/mock/f41-build-830929-156786/root/chroot_tmpdir/scmroot/chntpw'...
$ git fetch origin 635b28930932dee18f29838f568598f148635fbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chntpw
 * [new ref]         635b28930932dee18f29838f568598f148635fbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 635b289 It helps to apply the patch.