$ git clone -n https://src.fedoraproject.org/rpms/cockpit-composer.git /var/lib/mock/f41-build-side-1-3002901-36598/root/chroot_tmpdir/scmroot/cockpit-composer
Cloning into '/var/lib/mock/f41-build-side-1-3002901-36598/root/chroot_tmpdir/scmroot/cockpit-composer'...
$ git fetch origin 2b9ec4ebf0efd27b43ab7670c21d8f955ba1c6c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cockpit-composer
 * [new ref]         2b9ec4ebf0efd27b43ab7670c21d8f955ba1c6c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b9ec4e Update to 52 upstream release