$ git clone -n https://src.fedoraproject.org/rpms/ghc-language-c99.git /var/lib/mock/f45-build-10474-418/root/chroot_tmpdir/scmroot/ghc-language-c99
Cloning into '/var/lib/mock/f45-build-10474-418/root/chroot_tmpdir/scmroot/ghc-language-c99'...
$ git fetch origin 6516c1ae9348c0994679f56765b585afcfaa82a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-language-c99
 * [new ref]         6516c1ae9348c0994679f56765b585afcfaa82a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6516c1a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild