$ git clone -n https://src.fedoraproject.org/rpms/flatpak-rpm-macros.git /var/lib/mock/f45-build-9051-398/root/chroot_tmpdir/scmroot/flatpak-rpm-macros
Cloning into '/var/lib/mock/f45-build-9051-398/root/chroot_tmpdir/scmroot/flatpak-rpm-macros'...
$ git fetch origin 91c59183277527989ad2e7e5b30888e9eb389b71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-rpm-macros
 * [new ref]         91c59183277527989ad2e7e5b30888e9eb389b71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91c5918 Bump version