From 07fc7b9227b699397f8c838c36f2ab719bfddcd6 Mon Sep 17 00:00:00 2001
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 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Mon, 30 Oct 2023 12:25:05 +0300
Subject: [PATCH] =?UTF-8?q?mdbx-test:=20=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2?=
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---
 GNUmakefile             |  6 +++---
 test/long_stochastic.sh | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index c8d79a95..104ae372 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -418,15 +418,15 @@ smoke-fault: build-test
 
 test: build-test
 	@echo '  RUNNING `test/long_stochastic.sh --loops 2`...'
-	$(QUIET)test/long_stochastic.sh --dont-check-ram-size --loops 2 --db-upto-mb 256 --skip-make >$(TEST_LOG) || (cat $(TEST_LOG) && false)
+	$(QUIET)test/long_stochastic.sh --dont-check-ram-size --loops 2 --db-upto-mb 256 --skip-make --taillog >$(TEST_LOG) || (cat $(TEST_LOG) && false)
 
 long-test: build-test
 	@echo '  RUNNING `test/long_stochastic.sh --loops 42`...'
-	$(QUIET)test/long_stochastic.sh --loops 42 --db-upto-mb 1024 --skip-make
+	$(QUIET)test/long_stochastic.sh --loops 42 --db-upto-mb 1024 --skip-make --taillog
 
 test-singleprocess: build-test
 	@echo '  RUNNING `test/long_stochastic.sh --single --loops 2`...'
-	$(QUIET)test/long_stochastic.sh --dont-check-ram-size --single --loops 2 --db-upto-mb 256 --skip-make >$(TEST_LOG) || (cat $(TEST_LOG) && false)
+	$(QUIET)test/long_stochastic.sh --dont-check-ram-size --single --loops 2 --db-upto-mb 256 --skip-make --taillog >$(TEST_LOG) || (cat $(TEST_LOG) && false)
 
 test-valgrind: CFLAGS_EXTRA=-Ofast -DMDBX_USE_VALGRIND
 test-valgrind: build-test
diff --git a/test/long_stochastic.sh b/test/long_stochastic.sh
index 491ec695..c03c83da 100755
--- a/test/long_stochastic.sh
+++ b/test/long_stochastic.sh
@@ -13,6 +13,7 @@ DB_UPTO_MB=17408
 PAGESIZE=min
 DONT_CHECK_RAM=no
 EXTRA=no
+TAILLOG=0
 
 while [ -n "$1" ]
 do
@@ -35,9 +36,13 @@ do
     echo "--pagesize NN          Use specified page size (256 is minimal and used by default)"
     echo "--dont-check-ram-size  Don't check available RAM"
     echo "--extra                Iterate extra modes/flags"
+    echo "--taillog              Dump tail of test log on failure"
     echo "--help                 Print this usage help and exit"
     exit -2
   ;;
+  --taillog)
+    TAILLOG=999
+  ;;
   --multi)
     LIST=basic
   ;;
@@ -345,14 +350,38 @@ if which lz4 >/dev/null; then
   function logger {
     lz4 > ${TESTDB_DIR}/long.log.lz4
   }
+  function taillog {
+    if [ -s ${TESTDB_DIR}/long.log.lz4 ]; then
+      echo "=============================================== last ${TAILLOG} lines"
+      lz4 -d -c ${TESTDB_DIR}/long.log.lz4 | tail -n ${TAILLOG}
+    else
+      echo "=============================================== no test log"
+    fi
+  }
 elif which gzip >/dev/null; then
   function logger {
     gzip > ${TESTDB_DIR}/long.log.gz
   }
+  function taillog {
+    if [ -s ${TESTDB_DIR}/long.log.gz ]; then
+      echo "=============================================== last ${TAILLOG} lines"
+      gzip -d -c ${TESTDB_DIR}/long.log.gz | tail -n ${TAILLOG}
+    else
+      echo "=============================================== no test log"
+   fi
+  }
 else
   function logger {
     cat > ${TESTDB_DIR}/long.log
   }
+  function taillog {
+    if [ -s ${TESTDB_DIR}/long.log ]; then
+      echo "=============================================== last ${TAILLOG} lines"
+      tail -n ${TAILLOG} ${TESTDB_DIR}/long.log
+    else
+      echo "=============================================== no test log"
+    fi
+  }
 fi
 
 if [ "$EXTRA" != "no" ]; then
@@ -375,6 +404,9 @@ function bits2options {
 
 function failed {
   echo "FAILED" >&2
+  if [ ${TAILLOG} -gt 0 ]; then
+    taillog
+  fi
   exit 1
 }