ci: add cargo clippy for agent

To run `cargo clippy`, this commit includes changes:

- add a new Makefile target to run `cargo clippy`
- move `make`/`make check` to last step to let a fast retrun if `fmt`/`clippy` failed

Fixes: #951

Signed-off-by: bin liu <bin@hyper.sh>

.travis.yml

@@ -15,7 +15,7 @@ os: linux
 # https://docs.travis-ci.com/user/caching#clearing-caches
 language: rust
 rust:
-  - 1.44.1
+  - 1.47.0
 cache:
   cargo: true
   directories:
@@ -36,9 +36,9 @@ install:
   - rustup target add x86_64-unknown-linux-musl
   - sudo ln -sf /usr/bin/g++ /bin/musl-g++
   - rustup component add rustfmt
-  - make -C ${TRAVIS_BUILD_DIR}/src/agent
-  - make -C ${TRAVIS_BUILD_DIR}/src/agent check
-  - sudo -E PATH=$PATH make -C ${TRAVIS_BUILD_DIR}/src/agent check
+  - rustup component add clippy
+  - make -C ${TRAVIS_BUILD_DIR}/src/agent clippy
+  - "ci/static-checks.sh"
 
 before_script:
   - "ci/install_go.sh"
@@ -47,7 +47,9 @@ before_script:
   - sudo -E PATH=$PATH GOPATH=$GOPATH make -C ${TRAVIS_BUILD_DIR}/src/runtime test
 
 script:
-  - "ci/static-checks.sh"
+  - make -C ${TRAVIS_BUILD_DIR}/src/agent
+  - make -C ${TRAVIS_BUILD_DIR}/src/agent check
+  - sudo -E PATH=$PATH make -C ${TRAVIS_BUILD_DIR}/src/agent check
 
 jobs:
   include:

src/agent/Makefile

@@ -121,6 +121,12 @@ optimize: $(SOURCES) | show-summary show-header
 show-header:
 	@printf "%s - version %s (commit %s)\n\n" "$(TARGET)" "$(VERSION)" "$(COMMIT_MSG)"
 
+clippy: $(GENERATED_CODE)
+	cargo clippy --all-targets --all-features --release \
+		-- \
+		-Aclippy::redundant_allocation \
+		-D warnings
+
 $(GENERATED_FILES): %: %.in
 	@sed $(foreach r,$(GENERATED_REPLACEMENTS),-e 's|@$r@|$($r)|g') "$<" > "$@"
 

versions.yaml

@@ -289,7 +289,7 @@ languages:
       description: |
         'newest-version' is the latest version known to work when
         building Kata
-      newest-version: "1.44.1"
+      newest-version: "1.47.0"
 
 specs:
   description: "Details of important specifications"