$ git clone -n https://src.fedoraproject.org/rpms/corosync.git /var/lib/mock/f40-build-746025-112345/root/chroot_tmpdir/scmroot/corosync
Cloning into '/var/lib/mock/f40-build-746025-112345/root/chroot_tmpdir/scmroot/corosync'...
$ git fetch origin a39be7a0603803f428c67af9f39bb93fd83ebe65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/corosync
 * [new ref]         a39be7a0603803f428c67af9f39bb93fd83ebe65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a39be7a New upstream release