$ git clone -n https://src.fedoraproject.org/rpms/openchange.git /var/lib/mock/f40-build-807548-145231/root/chroot_tmpdir/scmroot/openchange
Cloning into '/var/lib/mock/f40-build-807548-145231/root/chroot_tmpdir/scmroot/openchange'...
$ git fetch origin 3c21b261ecdadf1aa5d5c26bd616f5667d602acc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openchange
 * [new ref]         3c21b261ecdadf1aa5d5c26bd616f5667d602acc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c21b26 Fix build with new Samba 4.20.0rc1