$ git clone -n https://src.fedoraproject.org/rpms/libidn2.git /var/lib/mock/f40-build-2672360-67503/root/chroot_tmpdir/scmroot/libidn2
Cloning into '/var/lib/mock/f40-build-2672360-67503/root/chroot_tmpdir/scmroot/libidn2'...
$ git fetch origin 03eef2173e72f29bfb9f1c306925e7ad6fe15705:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libidn2
 * [new ref]         03eef2173e72f29bfb9f1c306925e7ad6fe15705 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03eef21 Upgrade to 2.3.7 (#2260623)