Support for overriding --mesos-root under upstart.
Previously only the sysv init script supported overriding `--mesos-root`
via an env var, and thus via `/etc/default/thermos`.
Bugs closed: AURORA-1647
Reviewed at https://reviews.apache.org/r/45179/
diff --git a/specs/debian/aurora-executor.thermos.upstart b/specs/debian/aurora-executor.thermos.upstart
index 7ebe4be..78b11b7 100644
--- a/specs/debian/aurora-executor.thermos.upstart
+++ b/specs/debian/aurora-executor.thermos.upstart
@@ -22,6 +22,7 @@
[ -r /etc/default/thermos ] && . /etc/default/thermos
exec start-stop-daemon --start --exec /usr/sbin/thermos_observer -- \
--port=${OBSERVER_PORT:-1338} \
+ --mesos-root=${MESOS_ROOT:-/var/lib/mesos} \
--log_to_disk=NONE \
--log_to_stderr=google:INFO
end script