Speed-up build times

- enable cache
- conditional build of ./depclose and ~/.local
- don't execute tests twice, directly collect coverage

.travis.yml

@@ -2,17 +2,30 @@ dist: trusty
 language: rust
 rust:
   - nightly
+cache:
+  cargo: true
+  directories:
+    - ./depclose
+    - ~/.local
+
 before_install:
-    - sudo apt-get update
-    - virtualenv ./depclose
-    - source ./depclose/bin/activate
-    - pip install --upgrade pip
-    - pip install -r ./tests/depclose-integration/requirements.txt
+#    - sudo apt-get update
+    - |
+        if [ ! -f ./depclose/bin/python ]; then
+            virtualenv ./depclose
+            source ./depclose/bin/activate
+            pip install --upgrade pip
+            pip install -r ./tests/depclose-integration/requirements.txt
+        else
+            source ./depclose/bin/activate
+        fi
     - |
-        LOCAL="~/.local" && export PATH=$LOCAL/bin:$PATH &&
-        wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
-        tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build &&
-        cmake -DCMAKE_INSTALL_PREFIX:PATH=$LOCAL .. && make && make install && cd ../..
+        if [ ! -f ~/.local/bin/kcov ]; then
+            LOCAL="~/.local" && export PATH=$LOCAL/bin:$PATH &&
+            wget https://github.com/SimonKagstrom/kcov/archive/master.tar.gz &&
+            tar xzf master.tar.gz && mkdir kcov-master/build && cd kcov-master/build &&
+            cmake -DCMAKE_INSTALL_PREFIX:PATH=$LOCAL .. && make && make install && cd ../..
+        fi
 
 addons:
   apt:
@@ -33,17 +46,24 @@ addons:
       - libiberty-dev
 
 script:
-  - make travis-ci
-after_script:
   - |
-      ls -l target/debug &&
+      make bdcs-api
+      make clippy
+
+      # NOTE: this will execute all tests and collect coverage
+      # we don't call make test b/c that executes the tests again
       for file in target/debug/*-*; do
         if [[ "${file: -2}" != ".d" ]]; then
           mkdir -p "target/kcov/$(basename $file)";
           kcov --include-path=./src --verify "target/kcov/$(basename $file)" "$file";
         fi;
-      done &&
+      done
+
+      make depclose
+
+after_script:
       kcov --coveralls-id=$TRAVIS_JOB_ID --merge target/kcov target/kcov/*
+
 notifications:
   email:
     on_failure: change

Makefile

@@ -22,5 +22,3 @@ depclose: bdcs-api
 	wget https://s3.amazonaws.com/atodorov/metadata_centos7.db.gz
 	gunzip ./metadata_centos7.db.gz
 	METADATA_DB=`realpath ./metadata_centos7.db` make -C ./tests/depclose-integration/ test
-
-travis-ci: test depclose