$ git clone -n https://src.fedoraproject.org/rpms/fdk-aac-free.git /var/lib/mock/f45-build-8803-396/root/chroot_tmpdir/scmroot/fdk-aac-free
Cloning into '/var/lib/mock/f45-build-8803-396/root/chroot_tmpdir/scmroot/fdk-aac-free'...
$ git fetch origin 827a29f5cca86bb4549951b29dc7bf70c76b0810:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fdk-aac-free
 * [new ref]         827a29f5cca86bb4549951b29dc7bf70c76b0810 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 827a29f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild