$ git clone -n https://src.fedoraproject.org/rpms/ghc-srpm-macros-epel.git /var/lib/mock/f41-build-side-1-3106839-39377/root/chroot_tmpdir/scmroot/ghc-srpm-macros-epel
Cloning into '/var/lib/mock/f41-build-side-1-3106839-39377/root/chroot_tmpdir/scmroot/ghc-srpm-macros-epel'...
$ git fetch origin 7cb51fcd642ffd2a1db7e2135b089d7856c3b03a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-srpm-macros-epel
 * [new ref]         7cb51fcd642ffd2a1db7e2135b089d7856c3b03a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cb51fc Added the README