$ git clone -n https://src.fedoraproject.org/rpms/ghc-dec.git /var/lib/mock/f45-build-10198-414/root/chroot_tmpdir/scmroot/ghc-dec
Cloning into '/var/lib/mock/f45-build-10198-414/root/chroot_tmpdir/scmroot/ghc-dec'...
$ git fetch origin 4b6ca9c0d95dbfc1df707cdf3dbc52fa3dc0e018:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-dec
 * [new ref]         4b6ca9c0d95dbfc1df707cdf3dbc52fa3dc0e018 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b6ca9c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild