$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcontacts.git /var/lib/mock/f40-build-754784-117978/root/chroot_tmpdir/scmroot/kf6-kcontacts
Cloning into '/var/lib/mock/f40-build-754784-117978/root/chroot_tmpdir/scmroot/kf6-kcontacts'...
$ git fetch origin 604fd52f909bfa107e1b2d064a1b1421dab64cee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcontacts
 * [new ref]         604fd52f909bfa107e1b2d064a1b1421dab64cee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 604fd52 fix: add missing sources