$ git clone -n https://src.fedoraproject.org/rpms/widevine-installer.git /var/lib/mock/f41-build-856992-167860/root/chroot_tmpdir/scmroot/widevine-installer
Cloning into '/var/lib/mock/f41-build-856992-167860/root/chroot_tmpdir/scmroot/widevine-installer'...
$ git fetch origin 75388a8852f2c82d0b9e41c8c30b90b1e31d14f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/widevine-installer
 * [new ref]         75388a8852f2c82d0b9e41c8c30b90b1e31d14f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75388a8 Bump to latest commit again; Hopefully fixes: RHBZ#2250529