From: Tomáš Virtus <nechtom@gmail.com>
Date: Mon, 3 Feb 2020 12:31:27 +0000 (+0100)
Subject: Fix duplicate Syslinux entries
X-Git-Tag: v0.18.0~9^2~2
X-Git-Url: https://git.grml.org/?p=grml2usb.git;a=commitdiff_plain;h=f0e3c9362fe714123e8090207b382ceec0a87416;hp=ed5b633be961ef6b3651b1e4c7756538c032aa19

Fix duplicate Syslinux entries

Documentation of open()[1] says:

  Other common values ... and 'a' for appending (which on some Unix
  systems, means that all writes append to the end of the file
  regardless of the current seek position).

On my system (Linux 5.4), writes to a file opened as 'a+' go at the end.

[1] https://docs.python.org/3/library/functions.html#open
---

diff --git a/grml2usb b/grml2usb
index c53f58b..5a94e10 100755
--- a/grml2usb
+++ b/grml2usb
@@ -1323,7 +1323,7 @@ def add_entry_if_not_present(filename, entry):
     @filename: name of the file
     @entry: data to write to the file
     """
-    data = open(filename, "a+")
+    data = open(filename, "r+")
     for line in data:
         if line == entry:
             break