Fix recognition of "linuxchromeos" directory in cr

Since the strings "linuxchromeos" and "linux" both match the
directory name, cr throws an error for not being able to find the
platform. This CL fixes this issue to match substrings better.

Review URL: https://codereview.chromium.org/1562083002

Cr-Commit-Position: refs/heads/master@{#368115}

1 files changed, 5 insertions, 2 deletions

diff --git a/tools/cr/cr/commands/init.py b/tools/cr/cr/commands/init.py
index 647176a..7b09330 100644
--- a/tools/cr/cr/commands/init.py
+++ b/tools/cr/cr/commands/init.py
@@ -83,13 +83,16 @@ class InitCommand(cr.Command):
         # Try to guess platform based on output name
         platforms = [p.name for p in cr.Platform.AllPlugins()]
         matches = [p for p in platforms if p in base]
-        if len(matches) != 1:
+        # Get the longest matching string and check if the others are
+        # substrings. This is done to support "linuxchromeos" and "linux".
+        platform = max(matches, key=len)
+        all_matches_are_substrings = all(p in platform for p in matches)
+        if all_matches_are_substrings or not matches:
           print 'Platform is not set, and could not be guessed from', base
           print 'Should be one of', ','.join(platforms)
           if len(matches) > 1:
             print 'Matched all of', ','.join(matches)
           exit(1)
-        platform = matches[0]
       generator = cr.context.args.CR_GENERATOR
       if not generator:
         generator = 'gyp'