$ git clone -n https://src.fedoraproject.org/rpms/libebml.git /var/lib/mock/f45-build-16086-481/root/chroot_tmpdir/scmroot/libebml
Cloning into '/var/lib/mock/f45-build-16086-481/root/chroot_tmpdir/scmroot/libebml'...
$ git fetch origin 93b1371bf574ed717be19709c48dc79a4c1659c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libebml
 * [new ref]         93b1371bf574ed717be19709c48dc79a4c1659c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93b1371 update to 1.4.7 (resolves rhbz#2520272)