$ git clone -n https://src.fedoraproject.org/rpms/shairport-sync.git /var/lib/mock/f41-build-873624-16167/root/chroot_tmpdir/scmroot/shairport-sync
Cloning into '/var/lib/mock/f41-build-873624-16167/root/chroot_tmpdir/scmroot/shairport-sync'...
$ git fetch origin 3a94b2c6473e9eff8702ce8f4707fbf9b47aa6e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/shairport-sync
 * [new ref]         3a94b2c6473e9eff8702ce8f4707fbf9b47aa6e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a94b2c Update sources