$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rsvg2.git /var/lib/mock/f41-build-700323-12886/root/chroot_tmpdir/scmroot/rubygem-rsvg2
Cloning into '/var/lib/mock/f41-build-700323-12886/root/chroot_tmpdir/scmroot/rubygem-rsvg2'...
$ git fetch origin 97bce1854fc5e58331dad3120853b2c1d5efff5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rsvg2
 * [new ref]         97bce1854fc5e58331dad3120853b2c1d5efff5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 97bce18 4.2.2 entry