$ git clone -n https://src.fedoraproject.org/rpms/par2cmdline.git /var/lib/mock/f41-build-side-1-2650378-27586/root/chroot_tmpdir/scmroot/par2cmdline
Cloning into '/var/lib/mock/f41-build-side-1-2650378-27586/root/chroot_tmpdir/scmroot/par2cmdline'...
$ git fetch origin dd3fba5f8e1a3369474e3ea5d7f0c8274794c165:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/par2cmdline
 * [new ref]         dd3fba5f8e1a3369474e3ea5d7f0c8274794c165 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd3fba5 convert GPLv2+ license to SPDX