$ git clone -n https://src.fedoraproject.org/rpms/cosmic-panel.git /var/lib/mock/f42-build-59082923-6570930/root/chroot_tmpdir/scmroot/cosmic-panel
Cloning into '/var/lib/mock/f42-build-59082923-6570930/root/chroot_tmpdir/scmroot/cosmic-panel'...
$ git fetch origin 003efd19ff6c4471150fcf00545899cb2b325b23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-panel
 * [new ref]         003efd19ff6c4471150fcf00545899cb2b325b23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 003efd1 "Update to 1.0.0~alpha.7"