$ git clone -n https://src.fedoraproject.org/rpms/golang-github-uber-jaeger-lib.git /var/lib/mock/f41-build-side-1-2878542-34444/root/chroot_tmpdir/scmroot/golang-github-uber-jaeger-lib
Cloning into '/var/lib/mock/f41-build-side-1-2878542-34444/root/chroot_tmpdir/scmroot/golang-github-uber-jaeger-lib'...
$ git fetch origin 3aa3c17aa93376954bb08a729a75eded3c282cfd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-uber-jaeger-lib
 * [new ref]         3aa3c17aa93376954bb08a729a75eded3c282cfd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3aa3c17 convert ASL 2.0 license to SPDX