$ git clone -n https://src.fedoraproject.org/rpms/stalonetray.git /var/lib/mock/f45-build-36503-706/root/chroot_tmpdir/scmroot/stalonetray
Cloning into '/var/lib/mock/f45-build-36503-706/root/chroot_tmpdir/scmroot/stalonetray'...
$ git fetch origin f21de7930e65eb955a8db36bca8dfb8110c8219d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stalonetray
 * [new ref]         f21de7930e65eb955a8db36bca8dfb8110c8219d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f21de79 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild