$ git clone -n https://src.fedoraproject.org/rpms/z3.git /var/lib/mock/f39-build-2044468-48689/root/chroot_tmpdir/scmroot/z3
Cloning into '/var/lib/mock/f39-build-2044468-48689/root/chroot_tmpdir/scmroot/z3'...
$ git fetch origin 69a9e69b2450ba2c4e3eedb4b80c47a24bbc7197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/z3
 * [new ref]         69a9e69b2450ba2c4e3eedb4b80c47a24bbc7197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69a9e69 Version 4.12.4