$ git clone -n https://src.fedoraproject.org/rpms/boinc-client.git /var/lib/mock/f33-build-347505-59574/root/chroot_tmpdir/scmroot/boinc-client
Cloning into '/var/lib/mock/f33-build-347505-59574/root/chroot_tmpdir/scmroot/boinc-client'...
$ git reset --hard b1495bc2743c9647613cf99da4facf7e50090a1c
HEAD is now at b1495bc fixed desktop filename in %files section