Overhaul coverage setup

scripts/coverage.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+#
+# Runs all tests and collects code coverage
+#
+# Warning: this process is a little slow
+#
+
+set -e
+cd "$(dirname "$0")/.."
+
+_() {
+  echo "--- $*"
+  "$@"
+}
+
+: "${BUILDKITE_COMMIT:=local}"
+reportName="lcov-${BUILDKITE_COMMIT:0:9}"
+
+export RUSTFLAGS="
+  -Zprofile
+  -Zno-landing-pads
+  -Ccodegen-units=1
+  -Cinline-threshold=0
+  -Coverflow-checks=off
+"
+export CARGO_INCREMENTAL=0
+export RUST_BACKTRACE=1
+
+echo "--- remove old coverage results"
+
+if [[ -d target/cov ]]; then
+  find target/cov -name \*.gcda -print0 | xargs -0 rm -f
+fi
+rm -rf target/cov/$reportName
+
+_ cargo +nightly build --target-dir target/cov --all
+_ cargo +nightly test --target-dir target/cov --lib --all
+
+_ scripts/fetch-grcov.sh
+echo "--- grcov"
+./grcov target/cov/debug/deps/ > target/cov/lcov_full.info
+
+echo "--- filter_non_local_files_from_lcov"
+filter_non_local_files_from_lcov() {
+  declare skip=false
+  while read -r line; do
+    if [[ $line =~ ^SF:/ ]]; then
+      skip=true # Skip all absolute paths as these are references into ~/.cargo
+    elif [[ $line =~ ^SF:(.*) ]]; then
+      # Skip relative paths that don't exist
+      declare file="${BASH_REMATCH[1]}"
+      if [[ -r $file ]]; then
+        skip=false
+      else
+        skip=true
+      fi
+    fi
+    [[ $skip = true ]] || echo "$line"
+  done
+}
+
+filter_non_local_files_from_lcov < target/cov/lcov_full.info > target/cov/lcov.info
+
+echo "--- html report"
+# ProTip: genhtml comes from |brew install lcov| or |apt-get install lcov|
+genhtml --output-directory target/cov/$reportName \
+  --show-details \
+  --highlight \
+  --ignore-errors source \
+  --prefix "$PWD" \
+  --legend \
+  target/cov/lcov.info
+
+(
+  cd target/cov
+  tar zcf report.tar.gz $reportName
+)
+
+ls -l target/cov/$reportName/index.html