$ git clone -n https://src.fedoraproject.org/rpms/copr-keygen.git /var/lib/mock/f40-build-2275932-55115/root/chroot_tmpdir/scmroot/copr-keygen
Cloning into '/var/lib/mock/f40-build-2275932-55115/root/chroot_tmpdir/scmroot/copr-keygen'...
$ git fetch origin 7db8e3b269fb0622a88400796b77643ada4a4628:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-keygen
 * [new ref]         7db8e3b269fb0622a88400796b77643ada4a4628 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7db8e3b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild