Add script for collecting coverage
Tested with Bazel 0.5rc3
Change-Id: I6cf0b58cd2e7ead0edde8922ddf97f6ea9be6271
diff --git a/tools/coverage.sh b/tools/coverage.sh
new file mode 100644
index 0000000..8fa979f
--- /dev/null
+++ b/tools/coverage.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+#
+# Usage
+#
+# COVERAGE_CPUS=32 tools/coverage.sh [/path/to/report-directory/]
+#
+# COVERAGE_CPUS defaults to 2, and the default destination is a temp
+# dir.
+
+genhtml=$(which genhtml)
+if [[ -z "${genhtml}" ]]; then
+ echo "Install 'genhtml' (contained in the 'lcov' package)"
+ exit 1
+fi
+
+destdir="$1"
+if [[ -z "${destdir}" ]]; then
+ destdir=$(mktemp -d /tmp/gerritcov.XXXXXX)
+fi
+
+echo "Running 'bazel coverage'; this may take a while"
+
+# coverage is expensive to run; use --jobs=2 to avoid overloading the
+# machine.
+bazel coverage -k --jobs=${COVERAGE_CPUS:-2} -- ... -//gerrit-common:auto_value_tests
+
+# The coverage data contains filenames relative to the Java root, and
+# genhtml has no logic to search these elsewhere. Workaround this
+# limitation by running genhtml in a directory with the files in the
+# right place. Also -inexplicably- genhtml wants to have the source
+# files relative to the output directory.
+mkdir -p ${destdir}/
+cp -a */src/{main,test}/java/* ${destdir}/
+
+base=$(bazel info bazel-testlogs)
+for f in $(find ${base} -name 'coverage.dat') ; do
+ cp $f ${destdir}/$(echo $f| sed "s|${base}/||" | sed "s|/|_|g")
+done
+
+cd ${destdir}
+find -name '*coverage.dat' -size 0 -delete
+
+genhtml -o . --ignore-errors source *coverage.dat
+
+echo "coverage report at file://${destdir}/index.html"
