$ git clone -n https://src.fedoraproject.org/rpms/purple-mm-sms.git /var/lib/mock/f40-build-2675444-67826/root/chroot_tmpdir/scmroot/purple-mm-sms
Cloning into '/var/lib/mock/f40-build-2675444-67826/root/chroot_tmpdir/scmroot/purple-mm-sms'...
$ git fetch origin 91cc5dafea41c5ae429361ebf3f6ae5f30b5c163:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/purple-mm-sms
 * [new ref]         91cc5dafea41c5ae429361ebf3f6ae5f30b5c163 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91cc5da Use %autorelease and %autochangelog