From b8733e960daa678ef4d568ffaa7aae0610166fb4 Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Mon, 17 Jan 2022 00:54:28 -0600
Subject: [PATCH 5/7] wip: cirrus: code coverage

XXX: lcov should be installed in the OS image

XXX: Use --num-spaces=4 like in src/Makefile.global.in ?

ci-os-only: linux
---
 .cirrus.yml                       | 13 +++++++++++--
 src/tools/ci/code-coverage-report | 24 ++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100755 src/tools/ci/code-coverage-report

diff --git a/.cirrus.yml b/.cirrus.yml
index e168a52a85a..d9136365724 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -181,6 +181,7 @@ task:
     cat /proc/cmdline
     ulimit -a -H && ulimit -a -S
     export
+    git diff --name-only "$BASE_COMMIT"
   create_user_script: |
     useradd -m postgres
     chown -R postgres:postgres .
@@ -192,13 +193,14 @@ task:
     mkdir -m 770 /tmp/cores
     chown root:postgres /tmp/cores
     sysctl kernel.core_pattern='/tmp/cores/%e-%s-%p.core'
-    #apt-get update
-    #apt-get -y install ...
+    apt-get update
+    apt-get -y install lcov
 
   configure_script: |
     su postgres <<-EOF
       ./configure \
         --enable-cassert --enable-debug --enable-tap-tests \
+        --enable-coverage \
         --enable-nls \
         \
         ${LINUX_CONFIGURE_FEATURES} \
@@ -218,6 +220,13 @@ task:
       make -s ${CHECK} ${CHECKFLAGS} -j${TEST_JOBS}
     EOF
 
+  # Build coverage report for files changed since the base commit.
+  generate_coverage_report_script: |
+    src/tools/ci/code-coverage-report "$BASE_COMMIT"
+
+  coverage_artifacts:
+    paths: ['coverage/**/*.html', 'coverage/**/*.png', 'coverage/**/*.gcov', 'coverage/**/*.css' ]
+
   on_failure:
     <<: *on_failure
     cores_script: src/tools/ci/cores_backtrace.sh linux /tmp/cores
diff --git a/src/tools/ci/code-coverage-report b/src/tools/ci/code-coverage-report
new file mode 100755
index 00000000000..c09a159704b
--- /dev/null
+++ b/src/tools/ci/code-coverage-report
@@ -0,0 +1,24 @@
+#! /bin/sh
+# Called during the linux CI task to generate a code coverage report.
+set -e
+
+base_branch=$1
+changed=`git diff --name-only "$base_branch" '*.c'`
+
+mkdir coverage
+
+# Coverage only for changed files
+# This is useful to see coverage of newly-added code, but won't
+# show added/lost coverage in files which this patch doesn't modify.
+
+gcov=coverage/coverage.gcov
+for f in $changed
+do
+	lcov --quiet --capture --directory "$f"
+done >"$gcov"
+
+# Exit successfully if no relevant files were changed
+[ -s "$gcov" ] || exit 0
+
+genhtml "$gcov" --output-directory coverage --show-details --legend --quiet
+cp coverage/index.html coverage/00-index.html
-- 
2.17.1