$ git clone -n https://src.fedoraproject.org/rpms/cvs.git /var/lib/mock/f40-build-1993775-43729/root/chroot_tmpdir/scmroot/cvs
Cloning into '/var/lib/mock/f40-build-1993775-43729/root/chroot_tmpdir/scmroot/cvs'...
$ git fetch origin fb2c44fbdb6cf3c91a569e018e2f220e54a70feb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cvs
 * [new ref]         fb2c44fbdb6cf3c91a569e018e2f220e54a70feb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb2c44f os2/dirent.c license is HPND