From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Mon, 17 Jan 2022 00:54:28 -0600
Subject: [PATCH 16/19] cirrus: code coverage

ci-os-only: linux
---
 .cirrus.yml                       | 16 ++++++++++++++++
 src/tools/ci/code-coverage-report | 29 +++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100755 src/tools/ci/code-coverage-report

diff --git a/.cirrus.yml b/.cirrus.yml
index 52092f83bc6..89de2753f9f 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -26,6 +26,13 @@ env:
   TEMP_CONFIG: ${CIRRUS_WORKING_DIR}/src/tools/ci/pg_ci_base.conf
   PG_TEST_EXTRA: kerberos ldap ssl
 
+  # The commit that this branch is rebased on.  There's no easy way to find this.
+  # This does the right thing for cfbot, which always squishes all patches into a single commit.
+  # And does the right thing for any 1-patch commits.
+  # Patch series manually submitted to cirrus would benefit from setting this to the
+  # number of patches in the series (or directly to the commit the series was rebased on).
+  BASE_COMMIT: HEAD~1
+
 
 # What files to preserve in case tests fail
 on_failure: &on_failure
@@ -177,6 +184,7 @@ 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 .
@@ -196,6 +204,7 @@ task:
     su postgres <<-EOF
       ./configure \
         --enable-cassert --enable-debug --enable-tap-tests \
+        --enable-coverage \
         --enable-nls \
         \
         ${LINUX_CONFIGURE_FEATURES} \
@@ -215,6 +224,13 @@ 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..0dce149dcf8
--- /dev/null
+++ b/src/tools/ci/code-coverage-report
@@ -0,0 +1,29 @@
+#! /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'` ||
+	[ $? -eq 1 ]
+
+outdir=coverage
+mkdir "$outdir"
+
+# Coverage is shown 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=$outdir/coverage.gcov
+for f in $changed
+do
+	# Avoid removed files
+	[ -f "$f" ] || continue
+
+	lcov --quiet --capture --directory "$f"
+done >"$gcov"
+
+# Exit successfully if no relevant files were changed
+[ -s "$gcov" ] || exit 0
+
+genhtml "$gcov" --show-details --legend --quiet --num-spaces=4 --output-directory "$outdir" --title="Coverage report of files changed since: $base_branch"
+cp "$outdir"/index.html "$outdir"/00-index.html
-- 
2.17.1


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