[ci] Add the coverage collection script.

diff --git a/scripts/ci/collect-coverage.sh b/scripts/ci/collect-coverage.sh
new file mode 100755 (executable)
index 0000000..f600c3a
--- /dev/null
+++ b/scripts/ci/collect-coverage.sh
@@ -0,0 +1,20 @@
+#!/bin/bash -x
+
+# This script is meant to be executed on all "slave" machines that run coverage collection.
+
+COV_DIR=coverage
+COV_INFO="$COV_DIR/$JOB_NAME.info"
+
+# Build Mono and collect coverage on the test suite.
+CI_TAGS=collect-coverage,monolite scripts/ci/run-jenkins.sh
+
+# Place the coverage info file into the coverage directory.
+# Multiple such files can be assembled to create a unified coverage report that spans multiple architectures and operating systems.
+mkdir "$COV_DIR"
+scripts/ci/run-step.sh --label=coverage-lcov --timeout=20m lcov --no-external -c -d mono -d support -d tools -o "$COV_INFO"
+
+# Generate HTML coverage report in the lcov directory at the root of the project.
+scripts/ci/run-step.sh --label=coverage-genhtml --timeout=20m genhtml "$COV_INFO" -o lcov
+
+# Make the paths relative so that they could be assembled from different Jenkins workspaces.
+sed -Eie "s#^SF:$WORKSPACE/?#SF:#" "$COV_INFO"