$ git clone -n https://src.fedoraproject.org/rpms/kf5-kcontacts.git /var/lib/mock/f40-build-786891-134632/root/chroot_tmpdir/scmroot/kf5-kcontacts
Cloning into '/var/lib/mock/f40-build-786891-134632/root/chroot_tmpdir/scmroot/kf5-kcontacts'...
$ git fetch origin 48b6be1bd555f6d09c59ace16a6a3b6bd933035f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kcontacts
 * [new ref]         48b6be1bd555f6d09c59ace16a6a3b6bd933035f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48b6be1 5.115.0