$ git clone -n https://src.fedoraproject.org/rpms/PyQt-builder.git /var/lib/mock/f39-build-1558498-37305/root/chroot_tmpdir/scmroot/PyQt-builder
Cloning into '/var/lib/mock/f39-build-1558498-37305/root/chroot_tmpdir/scmroot/PyQt-builder'...
$ git fetch origin df76cb7222e9f70bf97a1e18bbf8a5a5022fcf4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/PyQt-builder
 * [new ref]         df76cb7222e9f70bf97a1e18bbf8a5a5022fcf4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df76cb7 Update to new upstream release 1.15.2 (#2225119)