$ git clone -n https://src.fedoraproject.org/rpms/flatpak-rpm-macros.git /var/lib/mock/f40-build-1996504-44024/root/chroot_tmpdir/scmroot/flatpak-rpm-macros
Cloning into '/var/lib/mock/f40-build-1996504-44024/root/chroot_tmpdir/scmroot/flatpak-rpm-macros'...
$ git fetch origin c2c76c8bd87cfe6a46db59f99190cbaf9bfe69e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-rpm-macros
 * [new ref]         c2c76c8bd87cfe6a46db59f99190cbaf9bfe69e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2c76c8 Revbump