$ git clone -n https://src.fedoraproject.org/rpms/librsvg2.git /var/lib/mock/f39-build-2143687-50855/root/chroot_tmpdir/scmroot/librsvg2
Cloning into '/var/lib/mock/f39-build-2143687-50855/root/chroot_tmpdir/scmroot/librsvg2'...
$ git fetch origin 4873757f0532eb087af70d86789a1d4089c116a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librsvg2
 * [new ref]         4873757f0532eb087af70d86789a1d4089c116a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4873757 Update to 2.57.1