$ git clone -n https://src.fedoraproject.org/rpms/ghc-libBF.git /var/lib/mock/f45-build-10457-418/root/chroot_tmpdir/scmroot/ghc-libBF
Cloning into '/var/lib/mock/f45-build-10457-418/root/chroot_tmpdir/scmroot/ghc-libBF'...
$ git fetch origin 3ecffd9e989fc201729983c674fc01984977d20f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-libBF
 * [new ref]         3ecffd9e989fc201729983c674fc01984977d20f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ecffd9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild