ci: download a precompiled cargo-tarpaulin binary

.ci/tarpaulin.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+readonly version="0.10.0"
+readonly sha256sum="6843be8384bf14385b36a3118efc1ed2d25d531acb8df954cd3f93d44018b09e"
+readonly filename="cargo-tarpaulin-$version-travis"
+readonly tarball="$filename.tar.gz"
+
+cd .ci
+
+echo "$sha256sum  $tarball" > tarpaulin.sha256sum
+curl -OL "https://github.com/xd009642/tarpaulin/releases/download/$version/$tarball"
+sha256sum --check tarpaulin.sha256sum
+tar xf "$tarball"

.cirrus.yml

@@ -52,13 +52,13 @@ coverage_task:
         CODECOV_TOKEN: ENCRYPTED[1e221ef78a37c960613ff80db7141f3158e3218031934395466f4720f450b7acfd74e587819435ce9be0b13fa1b68f1b]
     keyutils_script: apt-get update && apt-get install libkeyutils-dev
     tarpaulin_cache:
-        folder: $CARGO_HOME/bin
-        populate_script: cargo install --version 0.10.0 cargo-tarpaulin
-        fingerprint_script: cargo install --list
+        folder: .ci
+        populate_script: .ci/tarpaulin.sh
+        fingerprint_script: cat .ci/tarpaulin.sh
     lockfile_script: cargo generate-lockfile
     cargo_cache:
         folder: $CARGO_HOME/registry
         fingerprint_script: cat Cargo.lock
-    coverage_script: cargo tarpaulin --out Xml
+    coverage_script: PATH=$PATH:$PWD/.ci cargo tarpaulin --out Xml
     upload_script: bash <(curl -s https://codecov.io/bash) -X gcov
     before_cache_script: rm -rf $CARGO_HOME/registry/index