$ git clone -n https://src.fedoraproject.org/rpms/jzlib.git /var/lib/mock/f41-build-1726376-24650/root/chroot_tmpdir/scmroot/jzlib
Cloning into '/var/lib/mock/f41-build-1726376-24650/root/chroot_tmpdir/scmroot/jzlib'...
$ git fetch origin be6c10cab7c1562e874c6f7554bb0f3fe8d94022:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jzlib
 * [new ref]         be6c10cab7c1562e874c6f7554bb0f3fe8d94022 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be6c10c Install license files in licensedir instead of docdir