From c5ebb370510b5a2c7fbeac332a2480f51e0c9070 Mon Sep 17 00:00:00 2001
From: Sen Huang <senhuang96@fb.com>
Date: Wed, 9 Oct 2019 09:39:52 -0400
Subject: [PATCH] Only check for filename collisions when using
 --output-dir-flat

---
 programs/fileio.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/programs/fileio.c b/programs/fileio.c
index 81633947f..39cc70b9c 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -1553,7 +1553,8 @@ int FIO_compressMultipleFilenames(FIO_prefs_t* const prefs, const char** inFileN
             const char* const dstFileName = FIO_determineCompressedName(srcFileName, outDirName, suffix);  /* cannot fail */
             error |= FIO_compressFilename_srcFile(prefs, ress, dstFileName, srcFileName, compressionLevel);
         }
-        FIO_checkFilenameCollisions(inFileNamesTable ,nbFiles);
+        if (outDirName)
+            FIO_checkFilenameCollisions(inFileNamesTable ,nbFiles);
     }
 
     FIO_freeCResources(ress);
@@ -2375,7 +2376,8 @@ FIO_decompressMultipleFilenames(FIO_prefs_t* const prefs,
 
             error |= FIO_decompressSrcFile(prefs, ress, dstFileName, srcFileName);
         }
-        FIO_checkFilenameCollisions(srcNamesTable ,nbFiles);
+        if (outDirName)
+            FIO_checkFilenameCollisions(srcNamesTable ,nbFiles);
     }
 
     FIO_freeDResources(ress);
-- 
2.47.2