$ git clone -n https://src.fedoraproject.org/rpms/ptpython.git /var/lib/mock/f39-build-1605853-38604/root/chroot_tmpdir/scmroot/ptpython
Cloning into '/var/lib/mock/f39-build-1605853-38604/root/chroot_tmpdir/scmroot/ptpython'...
$ git fetch origin af85f5bea767d35510b1d70b63ab38d5c7967146:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ptpython
 * [new ref]         af85f5bea767d35510b1d70b63ab38d5c7967146 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af85f5b Update to version 3.0.23, resolves rhbz#2148482