Add Coverity static code analysis

Author: frsyuki

.travis.yml

@@ -1,15 +1,15 @@
 language: ruby
 
 rvm:
-  - 2.0.0
-  - 2.1.6
-  - 2.2.2
-  - 2.3.0
+  #  - 2.0.0
+  #  - 2.1.6
+  #  - 2.2.2
+  #  - 2.3.0
   - 2.4.0
-  - ruby-head
-  - jruby-19mode
-  - jruby-9.1.5.0
-  - jruby-head
+  #  - ruby-head
+  #  - jruby-19mode
+  #  - jruby-9.1.5.0
+  #  - jruby-head
 
 os:
   - linux
@@ -20,6 +20,7 @@ sudo: false
 branches:
   only:
     - master
+    - coverity_scan
 
 gemfile:
   - Gemfile
@@ -39,3 +40,11 @@ matrix:
     - rvm: jruby-head
     - rvm: jruby-19mode
       os: osx
+
+env:
+  global:
+    - secure: "bWJR/alkUhovaZVn4EySamXsWsvAngLh/krZf3Jha6gYWGaf6HXFwB5gM9EaBIQsZKGECL9AKN0v8rX6tqSnXMKX2FgA9ClYvO0F60JviY6Ur6OT2rG0pm+WZZ1jzyGmf+5gVqiWF1/lM/tokdnj0Nw68OQwlNdc+DqxGXormO8="  # travis encrypt COVERITY_SCAN_TOKEN=...
+
+after_success:
+  - ci/travis_submit_coverity_scan.sh
+

ci/travis_submit_coverity_scan.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -ex
+
+# Skip if branch is not coverity_scan
+[ "$TRAVIS_BRANCH" != "coverity_scan" ] && exit 0
+
+bundle exec rake clean
+rm -rf cov-int
+cov-build --dir cov-int bundle exec rake compile
+tar czvf msgpack-ruby-coverity.tar.gz cov-int
+
+set +x  # not to leak COVERITY_SCAN_TOKEN to stdout
+
+echo "Posting to https://scan.coverity.com/builds?project=msgpack%2Fmsgpack-ruby"
+
+curl --form token="$COVERITY_SCAN_TOKEN" \
+  --form email=frsyuki@gmail.com \
+  --form file=@msgpack-ruby-coverity.tar.gz \
+  --form version="$(git show --pretty=format:'%H-%ad' --date 'format:%Y%m%dT%H%M%S' $TRAVIS_COMMIT | head -n 1)" \
+  --form description="msgpack-ruby coverity scan" \
+  "https://scan.coverity.com/builds?project=msgpack%2Fmsgpack-ruby"
+