$ git clone -n https://src.fedoraproject.org/rpms/ghc-HTTP.git /var/lib/mock/f45-build-9881-411/root/chroot_tmpdir/scmroot/ghc-HTTP
Cloning into '/var/lib/mock/f45-build-9881-411/root/chroot_tmpdir/scmroot/ghc-HTTP'...
$ git fetch origin a2c7270273a67ab6c327f52226bacd98daea34dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-HTTP
 * [new ref]         a2c7270273a67ab6c327f52226bacd98daea34dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2c7270 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild