gitlab-ci: add tarpaulin for coverage

.gitlab-ci.yml

@@ -37,6 +37,18 @@ before_script:
 .cargo_test: &cargo_test
     - cargo test --frozen --all --verbose
 
+.cargo_tarpaulin_build: &cargo_tarpaulin_build
+    - .gitlab/ci/sccache.sh && export RUSTC_WRAPPER=$PWD/.gitlab/sccache
+    - .gitlab/ci/tarpaulin.sh
+    - export PATH=$PWD/.gitlab:$PATH
+    - cargo tarpaulin --no-run --frozen --exclude-files vendor --ignore-panics --all --verbose
+    - ".gitlab/sccache --show-stats || :"
+
+.cargo_tarpaulin_test: &cargo_tarpaulin_test
+    - .gitlab/ci/tarpaulin.sh
+    - export PATH=$PWD/.gitlab:$PATH
+    - cargo tarpaulin --frozen --exclude-files vendor --ignore-panics --all --verbose
+
 .rust_minimum: &rust_minimum
     image: "rust:1.36.0"
 
@@ -118,6 +130,36 @@ before_script:
     script: *cargo_test
     interruptible: true
 
+.cargo_tarpaulin_build_job: &cargo_tarpaulin_build_job
+    stage: build
+    only: *only_settings
+    tags:
+        - build
+        - docker
+        - ghostflow
+        - linux
+    script: *cargo_tarpaulin_build
+    artifacts:
+        expire_in: 60m
+        paths:
+            - vendor
+            - .cargo
+            - Cargo.lock
+            - target
+    interruptible: true
+
+.cargo_tarpaulin_test_job: &cargo_tarpaulin_test_job
+    stage: test
+    only: *only_settings
+    tags:
+        - docker
+        - ghostflow
+        - linux
+        - privileged
+    script: *cargo_tarpaulin_test
+    coverage: '/\d+.\d+% coverage, \d+\/\d+ lines covered/'
+    interruptible: true
+
 stages:
     - prepare
     - build
@@ -178,6 +220,21 @@ test:cargo-stable:
     needs:
         - build:cargo-stable
 
+build:cargo-tarpaulin:
+    <<:
+        - *cargo_tarpaulin_build_job
+        - *rust_stable
+        - *cargo_cache_newest
+
+test:cargo-tarpaulin:
+    <<:
+        - *cargo_tarpaulin_test_job
+        - *rust_stable
+    dependencies:
+        - build:cargo-tarpaulin
+    needs:
+        - build:cargo-tarpaulin
+
 build:cargo-nightly:
     <<:
         - *cargo_build_job

.gitlab/ci/tarpaulin.sh

+#!/bin/sh
+
+set -e
+
+readonly version="0.10.0"
+readonly sha256sum="6843be8384bf14385b36a3118efc1ed2d25d531acb8df954cd3f93d44018b09e"
+readonly filename="cargo-tarpaulin-$version-travis"
+readonly tarball="$filename.tar.gz"
+
+cd .gitlab
+
+echo "$sha256sum  $tarball" > tarpaulin.sha256sum
+curl -OL "https://github.com/xd009642/tarpaulin/releases/download/$version/$tarball"
+sha256sum --check tarpaulin.sha256sum
+tar xf "$tarball"