Add melodic. (#16687)

* Add melodic.

Signed-off-by: Chris Lalancette <[email protected]>

* Fix the corner case of the distro not yet existing.

Signed-off-by: Chris Lalancette <[email protected]>

* Fixes from review.

Signed-off-by: Chris Lalancette <[email protected]>

index.yaml

@@ -21,5 +21,8 @@ distributions:
   lunar:
     distribution: [lunar/distribution.yaml]
     distribution_cache: http://repositories.ros.org/rosdistro_cache/lunar-cache.yaml.gz
+  melodic:
+    distribution: [melodic/distribution.yaml]
+    distribution_cache: http://repositories.ros.org/rosdistro_cache/melodic-cache.yaml.gz
 type: index
 version: 3

melodic/distribution.yaml

@@ -0,0 +1,15 @@
+%YAML 1.1
+# ROS distribution file
+# see REP 143: http://ros.org/reps/rep-0143.html
+---
+release_platforms:
+  debian:
+  - stretch
+  fedora:
+  - '28'
+  ubuntu:
+  - artful
+  - bionic
+repositories:
+type: distribution
+version: 2

scripts/check_duplicates.py

@@ -49,9 +49,19 @@ def create_default_sources():
     for distro in index['distributions']:
         distfile = 'file://' + basedir + '/' + distro + '/distribution.yaml'
         print('loading %s' % distfile)
-        rds = RosDistroSource(distro)
+        try:
+            rds = RosDistroSource(distro)
+        except KeyError:
+            # When first adding a ROS distro to the repository, it won't yet
+            # exist at the URL that RosDistroSource fetches from github.  When
+            # trying to index it, RosDistroSource will throw a KeyError.  If we
+            # see that KeyError, just ignore it and don't add the distro to the
+            # list of sources.
+            continue
+
         rosdep_data = get_gbprepo_as_rosdep_data(distro)
         sources.append(CachedDataSource('yaml', distfile, [distro], rosdep_data))
+
     for filename in os.listdir(os.path.join(basedir, 'rosdep')):
         if not filename.endswith('yaml'):
             continue