$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcontacts.git /var/lib/mock/f40-build-775010-127986/root/chroot_tmpdir/scmroot/kf6-kcontacts
Cloning into '/var/lib/mock/f40-build-775010-127986/root/chroot_tmpdir/scmroot/kf6-kcontacts'...
$ git fetch origin fa7b2a4ecf780985f12dc7a3dc08a751d0477fa0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcontacts
 * [new ref]         fa7b2a4ecf780985f12dc7a3dc08a751d0477fa0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa7b2a4 5.248.0