[PATCH 2/2] check: optionally compress core dumps

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Add a new option, COREDUMP_COMPRESSOR, that will be used to compress
core dumps collected during a fstests run.  The program specified must
accept the -f -9 arguments that gzip has.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 README    |    4 ++++
 common/rc |   14 +++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)


diff --git a/README b/README
index 80d148be82..4c4f22f853 100644
--- a/README
+++ b/README
@@ -212,6 +212,10 @@ Tools specification:
     - Set FSSTRESS_AVOID and/or FSX_AVOID, which contain options added to
       the end of fsstresss and fsx invocations, respectively, in case you wish
       to exclude certain operational modes from these tests.
+ - core dumps:
+    - Set COREDUMP_COMPRESSOR to a compression program to compress crash dumps.
+      This program must accept '-f' and the name of a file to compress.  In
+      other words, it must emulate gzip.
 
 Kernel/Modules related configuration:
  - Set TEST_FS_MODULE_RELOAD=1 to unload the module and reload it between
diff --git a/common/rc b/common/rc
index 152b8bb414..c68869b7dc 100644
--- a/common/rc
+++ b/common/rc
@@ -4956,13 +4956,17 @@ _save_coredump()
 	local core_hash="$(_md5_checksum "$path")"
 	local out_file="$RESULT_BASE/$seqnum.core.$core_hash"
 
-	if [ -s "$out_file" ]; then
-		rm -f "$path"
-		return
-	fi
-	rm -f "$out_file"
+	for dump in "$out_file"*; do
+		if [ -s "$dump" ]; then
+			rm -f "$path"
+			return 0
+		fi
+	done
 
 	mv "$path" "$out_file"
+	test -z "$COREDUMP_COMPRESSOR" && return 0
+
+	$COREDUMP_COMPRESSOR -f "$out_file"
 }
 
 init_rc