$ git clone -n https://src.fedoraproject.org/rpms/age.git /var/lib/mock/f41-build-854361-166847/root/chroot_tmpdir/scmroot/age
Cloning into '/var/lib/mock/f41-build-854361-166847/root/chroot_tmpdir/scmroot/age'...
$ git fetch origin a08acb0db23e6fa2eb20626e99e744797658c8c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/age
 * [new ref]         a08acb0db23e6fa2eb20626e99e744797658c8c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a08acb0 Update to 1.2.0 - Closes rhbz#2292862 rhbz#2255071