From b061ffb18b96bfc0109a528a679c32aa2b61cb63 Mon Sep 17 00:00:00 2001
From: Zack Winter <3457246+zackwintermdb@users.noreply.github.com>
Date: Mon, 26 Jan 2026 11:23:07 -0800
Subject: [PATCH] SERVER-117275 Compress coredumps in unit test wrapper
 (#46919)

GitOrigin-RevId: e63046efaa6b4a4c28282ca8a6180ac8e7f80636
---
 .bazelrc                            |  6 +++++-
 bazel/test_wrapper.sh               |  4 ++--
 evergreen/gather_mongo_coredumps.sh | 10 ++++++++++
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/.bazelrc b/.bazelrc
index c436a2ae700..3ad09a2664a 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -428,8 +428,12 @@ common:remote_test --strategy=TestRunner=remote
 common:remote_test --features=-thin_archive
 common:remote_test --remote_download_outputs=minimal
 common:remote_test --test_output=summary
+
+# The below line unsets the no-remote-cache execution info for the given strategies
+# even though upon first glance it looks like it's setting it.
 common:remote_test --modify_execution_info=^(TestRunner|CppLink|CppArchive|SolibSymlink|ExtractDebugInfo|StripDebugInfo|CcGenerateIntermediateDwp|CcGenerateDwp)$=-no-remote-cache
-common:remote_test --remote_download_regex=.*\.core$
+common:remote_test --remote_download_regex=.*\.(zip|core|mdmp|gz)$
+
 test:remote_test --test_tag_filters=-incompatible_with_bazel_remote_test
 
 # Coverage
diff --git a/bazel/test_wrapper.sh b/bazel/test_wrapper.sh
index 29da0f6134d..5a3592e8519 100755
--- a/bazel/test_wrapper.sh
+++ b/bazel/test_wrapper.sh
@@ -56,8 +56,8 @@ RET=$?
 
 CORE_FILE=$(find -L ./ -name "*.core")
 if [ -f "$CORE_FILE" ]; then
-    CORE_FILENAME="dump_$(date +%s%N).core"
-    mv $CORE_FILE "$TEST_UNDECLARED_OUTPUTS_DIR/$CORE_FILENAME"
+    CORE_FILENAME="dump_$(date +%s%N).core.gz"
+    gzip -c $CORE_FILE >"$TEST_UNDECLARED_OUTPUTS_DIR/$CORE_FILENAME"
     echo "Writing coredump to $CORE_FILENAME..."
 fi
 
diff --git a/evergreen/gather_mongo_coredumps.sh b/evergreen/gather_mongo_coredumps.sh
index 763543c317d..bcb3ad643f5 100755
--- a/evergreen/gather_mongo_coredumps.sh
+++ b/evergreen/gather_mongo_coredumps.sh
@@ -11,3 +11,13 @@ for core_file in $core_files; do
         ln -sf $core_file $base_name
     fi
 done
+
+# Find all gzipped core files and decompress them to src
+gzipped_core_files=$(/usr/bin/find -H .. bazel-testlogs -name "*.core.gz" 2>/dev/null)
+for gzipped_core_file in $gzipped_core_files; do
+    base_name=$(echo $gzipped_core_file | sed "s/.*\///" | sed "s/\.gz$//")
+    # Decompress file if it does not already exist
+    if [ ! -f $base_name ]; then
+        gunzip -c $gzipped_core_file >$base_name
+    fi
+done