add exe and script path check (#11621)

Summary:
Add path existence check in the script to avoid script running even when db_bench executable does not exist or relative path is not right.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11621

Reviewed By: jowlyzhang

Differential Revision: D47552590

Pulled By: ajkr

fbshipit-source-id: f09ea069f69e067212b249a22ad755b76bc6063a

tools/benchmark.sh

@@ -6,6 +6,7 @@
 EXIT_INVALID_ARGS=1
 EXIT_NOT_COMPACTION_TEST=2
 EXIT_UNKNOWN_JOB=3
+EXIT_INVALID_PATH=4
 
 # Size Constants
 K=1024
@@ -114,6 +115,11 @@ fi
 
 job_id=${JOB_ID}
 
+if [ ! -x ./db_bench ]; then
+  echo "./db_bench not found. Please make sure it exists in the current directory."
+  exit $EXIT_INVALID_PATH
+fi
+
 # Make it easier to run only the compaction test. Getting valid data requires
 # a number of iterations and having an ability to run the test separately from
 # rest of the benchmarks helps.

tools/run_blob_bench.sh

@@ -19,6 +19,7 @@
 
 # Exit Codes
 EXIT_INVALID_ARGS=1
+EXIT_INVALID_PATH=2
 
 # Size constants
 K=1024
@@ -74,6 +75,11 @@ if [ $# -ge 1 ]; then
   fi
 fi
 
+if [ ! -f tools/benchmark.sh ]; then
+  echo "tools/benchmark.sh not found"
+  exit $EXIT_INVALID_PATH
+fi
+
 # shellcheck disable=SC2153
 if [ -z "$DB_DIR" ]; then
   echo "DB_DIR is not defined"