$ git clone -n https://src.fedoraproject.org/rpms/lxmusic.git /var/lib/mock/f45-build-17817-504/root/chroot_tmpdir/scmroot/lxmusic
Cloning into '/var/lib/mock/f45-build-17817-504/root/chroot_tmpdir/scmroot/lxmusic'...
$ git fetch origin 10ab5b162827dce6f01587bfa778fd2b5c6ce0e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lxmusic
 * [new ref]         10ab5b162827dce6f01587bfa778fd2b5c6ce0e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10ab5b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild