File 0001-handle-sparse-files-efficiently.patch of Package rdiff-backup

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File 0001-handle-sparse-files-efficiently.patch of Package rdiff-backup (Revision 208dea6d3b2cf905d52e563cd5fad10e)

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From bfdf13c3b7cd4649d588303df32b7c7f59bbc77e Mon Sep 17 00:00:00 2001
From: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: Thu, 23 Jan 2020 20:02:31 +0100
Subject: [PATCH] handle sparse files efficiently

This patch is originally from Erich Wheeler, posted on the mailing list
http://lists.gnu.org/archive/html/rdiff-backup-users/2011-01/msg00000.html
I ported it forward, removed the "short reads" handling and amended it
to work with GzipFile output.
---
 src/rdiff_backup/rpath.py | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/rdiff_backup/rpath.py b/src/rdiff_backup/rpath.py
index f7a1168..5b23891 100644
--- a/src/rdiff_backup/rpath.py
+++ b/src/rdiff_backup/rpath.py
@@ -67,11 +67,32 @@ class RPathException(Exception):
 def copyfileobj(inputfp, outputfp):
     """Copies file inputfp to outputfp in blocksize intervals"""
     blocksize = Globals.blocksize
+
+    sparse = False
+    """Negative seeks are not supported by GzipFile"""
+    compressed = False
+    if isinstance(outputfp, gzip.GzipFile):
+        compressed = True
+
     while 1:
         inbuf = inputfp.read(blocksize)
         if not inbuf:
             break
-        outputfp.write(inbuf)
+
+        buflen = len(inbuf)
+        if not compressed and inbuf == b"\x00" * buflen:
+            outputfp.seek(buflen, os.SEEK_CUR)
+            # flag sparse=True, that we seek()ed, but have not written yet
+            # The filesize is wrong until we write
+            sparse = True
+        else:
+            outputfp.write(inbuf)
+            # We wrote, so clear sparse.
+            sparse = False
+
+    if sparse:
+        outputfp.seek(-1, os.SEEK_CUR)
+        outputfp.write(b"\x00")
 
 
 def cmpfileobj(fp1, fp2):
-- 
2.24.1

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File 0001-handle-sparse-files-efficiently.patch of Package rdiff-backup (Revision 208dea6d3b2cf905d52e563cd5fad10e)

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