$ git clone -n https://src.fedoraproject.org/rpms/ghc-language-c.git /var/lib/mock/f45-build-10467-418/root/chroot_tmpdir/scmroot/ghc-language-c
Cloning into '/var/lib/mock/f45-build-10467-418/root/chroot_tmpdir/scmroot/ghc-language-c'...
$ git fetch origin 89a54a10ee6fbd46cef74a4fe93f30c334b10b0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-language-c
 * [new ref]         89a54a10ee6fbd46cef74a4fe93f30c334b10b0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89a54a1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild