$ git clone -n https://src.fedoraproject.org/rpms/ghc-stm-chans.git /var/lib/mock/f45-build-10791-424/root/chroot_tmpdir/scmroot/ghc-stm-chans
Cloning into '/var/lib/mock/f45-build-10791-424/root/chroot_tmpdir/scmroot/ghc-stm-chans'...
$ git fetch origin 5f6df06a0f1e8772fbe8a114867d43847d73e0ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-stm-chans
 * [new ref]         5f6df06a0f1e8772fbe8a114867d43847d73e0ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f6df06 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild