Merge branch 'fix-python3-lttng' into 'master'

Use fixed python3-lttng and remove temporary workaround

See merge request ros_tracing/ros2_tracing!26

docker-ci-base/Dockerfile

@@ -1,10 +1,14 @@
 FROM ros:dashing-ros-base-bionic
 
 RUN apt-get update
+
 RUN apt-get install --no-install-recommends -y \
     libasio-dev \
     libtinyxml2-dev
 
+RUN apt-get install -y software-properties-common
+RUN apt-add-repository -y ppa:lttng/ppa
+RUN apt-get update
 RUN apt-get install -y \
     python3-lttng \
     python3-babeltrace

tracetools_trace/tracetools_trace/tools/lttng.py

@@ -14,19 +14,13 @@
 
 """Interface for tracing with LTTng."""
 
-import sys
 from typing import List
 
-# Temporary workaround
-sys.path = ['/usr/local/lib/python3.6/site-packages'] + sys.path
+import lttng
 
-import lttng  # noqa: E402
-
-from .names import (  # noqa: E402
-    DEFAULT_CONTEXT,
-    DEFAULT_EVENTS_KERNEL,
-    DEFAULT_EVENTS_ROS,
-)
+from .names import DEFAULT_CONTEXT
+from .names import DEFAULT_EVENTS_KERNEL
+from .names import DEFAULT_EVENTS_ROS
 
 
 def lttng_init(