Generate a metadata file artifact in unit test buildkite job

.buildkite/pipeline-master.yml

@@ -8,9 +8,12 @@ steps:
     agents:
       queue: "workers"
       docker: "*"
-    command: "CASSANDRA_HOST=cassandra make install-schema && make cover_profile" # make install-schema is needed for a server startup test. See main_test.go
+    commands:
+      - "CASSANDRA_HOST=cassandra make install-schema && make cover_profile" # make install-schema is needed for a server startup test. See main_test.go
+      - "./scripts/buildkite/gen_coverage_metadata.sh .build/coverage/metadata.txt"
     artifact_paths:
       - ".build/coverage/*.out"
+      - ".build/coverage/metadata.txt"
     retry:
       automatic:
         limit: 1

.buildkite/pipeline-pull-request.yml

@@ -11,8 +11,10 @@ steps:
     commands:
       - "make .just-build" # ensure that we are not rebuilding binaries and not regenerating code
       - "CASSANDRA_HOST=cassandra make install-schema && make cover_profile" # make install-schema is needed for a server startup test. See main_test.go
+      - "./scripts/buildkite/gen_coverage_metadata.sh .build/coverage/metadata.txt"
     artifact_paths:
       - ".build/coverage/*.out"
+      - ".build/coverage/metadata.txt"
     retry:
       automatic:
         limit: 1

scripts/buildkite/gen_coverage_metadata.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -ex
+
+# This script generates coverage metadata for the coverage report.
+# Output is used by SonarQube integration in Uber and not used by OS repo coverage tool itself.
+
+# Example output:
+#   commit-sha: 6953daa563e8e44512bc349c9608484cfd4ec4ff
+#   timestamp: 2024-03-04T19:29:16Z
+
+output_path="$1"
+
+echo "commit-sha: $(git rev-parse HEAD)" > "$output_path"
+echo "timestamp: $(date -u +%Y-%m-%dT%H:%M:%SZ)" >> "$output_path"
+
+echo "Coverage metadata written to $output_path"