$ git clone -n https://src.fedoraproject.org/rpms/vmod-querystring.git /var/lib/mock/f45-build-38150-722/root/chroot_tmpdir/scmroot/vmod-querystring
Cloning into '/var/lib/mock/f45-build-38150-722/root/chroot_tmpdir/scmroot/vmod-querystring'...
$ git fetch origin 88247a088d201f3a59d99c22f85cab6031a8beac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vmod-querystring
 * [new ref]         88247a088d201f3a59d99c22f85cab6031a8beac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88247a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild