$ git clone -n https://src.fedoraproject.org/rpms/boinc-client.git /var/lib/mock/f40-build-2274738-55026/root/chroot_tmpdir/scmroot/boinc-client
Cloning into '/var/lib/mock/f40-build-2274738-55026/root/chroot_tmpdir/scmroot/boinc-client'...
$ git fetch origin c485a7db094d9fb13ecc9d6b598b3c4934bf75ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/boinc-client
 * [new ref]         c485a7db094d9fb13ecc9d6b598b3c4934bf75ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c485a7d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild