$ git clone -n https://src.fedoraproject.org/forks/hursand/rpms/gnat-srpm-macros.git /var/lib/mock/f41-build-side-1-3139970-39856/root/chroot_tmpdir/scmroot/gnat-srpm-macros
Cloning into '/var/lib/mock/f41-build-side-1-3139970-39856/root/chroot_tmpdir/scmroot/gnat-srpm-macros'...
$ git fetch origin 1b5ebad230c2092a7146e231eb0068dcd42ce8ca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hursand/rpms/gnat-srpm-macros
 * [new ref]         1b5ebad230c2092a7146e231eb0068dcd42ce8ca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b5ebad Add riscv64 to %GPRbuild_arches