$ git clone -n https://src.fedoraproject.org/rpms/boinc-client.git /var/lib/mock/f41-build-859319-168684/root/chroot_tmpdir/scmroot/boinc-client
Cloning into '/var/lib/mock/f41-build-859319-168684/root/chroot_tmpdir/scmroot/boinc-client'...
$ git fetch origin 2c91bc1f359ce20b07424246d322e441a441cf96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/boinc-client
 * [new ref]         2c91bc1f359ce20b07424246d322e441a441cf96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c91bc1 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild