$ git clone -n https://src.fedoraproject.org/rpms/golang-github-arran4-ical.git /var/lib/mock/f41-build-side-1-3071434-38810/root/chroot_tmpdir/scmroot/golang-github-arran4-ical
Cloning into '/var/lib/mock/f41-build-side-1-3071434-38810/root/chroot_tmpdir/scmroot/golang-github-arran4-ical'...
$ git fetch origin 89100c100af500168bb600133d71c71e5656242e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-arran4-ical
 * [new ref]         89100c100af500168bb600133d71c71e5656242e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89100c1 Retire old aerc-related libraries. aerc is now vendored.