$ git clone -n https://src.fedoraproject.org/rpms/libdvdnav.git /var/lib/mock/f45-build-16081-481/root/chroot_tmpdir/scmroot/libdvdnav
Cloning into '/var/lib/mock/f45-build-16081-481/root/chroot_tmpdir/scmroot/libdvdnav'...
$ git fetch origin ac68383d23f9fac5ca69eb172ec822a6b3db21a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdvdnav
 * [new ref]         ac68383d23f9fac5ca69eb172ec822a6b3db21a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac68383 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild