[CRIU] [RFC] travis: add coveralls.io support

[Dmitry Safonov]

I suggest to add support for coveralls.io.
It can't show all coverage, as we don't run all tests on travis,
but still everyone who forked CRIU can see instant coverage of
his Travis build. As a nice feature, it will show code cover
increasing/decreasing just after you push a commit - which
could give you a nice hint about content of a new tests.
For this feature, we need to build CRIU with `make GCOV=1`,
which adds --coverage and disables optimizations.

The resulting report looks like this:
https://coveralls.io/builds/6439346
I was thinking about codecov.io also, but it has fewer community,
less fixed issues on github - so I choose this service.

Just a random fun fact:
file-ids.c covered completely on tests, except -ENOMEM return.
Maybe it worth to run fault injections tests on Travis.

Signed-off-by: Dmitry Safonov <dsafonov at virtuozzo.com>
---
 .travis.yml          | 5 +++++
 scripts/travis-tests | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 5cd1366c6e13..b661a45b5a1a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,3 +11,8 @@ env:
 script:
   - sudo make -C scripts/build $TR_ARCH
   - sudo ./scripts/travis-tests $TR_ARCH
+after_success:
+  - sudo apt-get install -qq -y lcov
+  - gem install coveralls-lcov
+  - sudo lcov --directory criu --capture --output-file coverage.info
+  - coveralls-lcov coverage.info
diff --git a/scripts/travis-tests b/scripts/travis-tests
index cb6ac1e5678a..d101439ffdf6 100755
--- a/scripts/travis-tests
+++ b/scripts/travis-tests
@@ -8,6 +8,6 @@ apt-get install -qq protobuf-c-compiler libprotobuf-c0-dev libaio-dev	\
 	libprotobuf-dev protobuf-compiler python-ipaddr libcap-dev	\
 	libnl-3-dev gcc-multilib libc6-dev-i386
 chmod a+x $HOME
-make
+make GCOV=1
 make -C test/zdtm
 python test/zdtm.py run -a -f h,ns -x 'cgroup*'
-- 
2.8.2