/usr/share/unity8-desktop-session/start-unity8-mir is in unity8-desktop-session-mir 1.0.10+14.04.20140417.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
export QT_QPA_PLATFORM=ubuntumirserver
export EGL_PLATFORM=mir
export EGL_LOG_LEVEL=debug
exec /usr/bin/unity8
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