$ git clone -n https://src.fedoraproject.org/rpms/libdnf-plugin-txnupd.git /var/lib/mock/f45-build-16069-481/root/chroot_tmpdir/scmroot/libdnf-plugin-txnupd
Cloning into '/var/lib/mock/f45-build-16069-481/root/chroot_tmpdir/scmroot/libdnf-plugin-txnupd'...
$ git fetch origin f3df15e6e3ef1e8a57f7d85d25dccc0610db8478:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdnf-plugin-txnupd
 * [new ref]         f3df15e6e3ef1e8a57f7d85d25dccc0610db8478 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3df15e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild