From 7f1fd10cfebd5ea2f3e1938abe1bd1c4828164a7 Mon Sep 17 00:00:00 2001
From: Fabio Berton <fabio.berton@ossystems.com.br>
Date: Fri, 9 Sep 2016 16:00:42 -0300
Subject: [PATCH] handle read-only files

Patch from:
https://github.com/darealshinji/patchelf/commit/40e66392bc4b96e9b4eda496827d26348a503509

Upstream-Status: Denied [https://github.com/NixOS/patchelf/pull/89]

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>

---
 src/patchelf.cc | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/patchelf.cc b/src/patchelf.cc
index 0b4965adff83..b5db2aef0e8a 100644
--- a/src/patchelf.cc
+++ b/src/patchelf.cc
@@ -497,7 +497,17 @@ void ElfFile<ElfFileParamNames>::sortShdrs()
 
 static void writeFile(std::string fileName, FileContents contents)
 {
-    int fd = open(fileName.c_str(), O_TRUNC | O_WRONLY);
+    struct stat st;
+    int fd;
+
+    if (stat(fileName.c_str(), &st) != 0)
+        error("stat");
+
+    if (chmod(fileName.c_str(), 0600) != 0)
+        error("chmod");
+
+    fd = open(fileName.c_str(), O_TRUNC | O_WRONLY);
+
     if (fd == -1)
         error("open");
 
@@ -511,6 +521,10 @@ static void writeFile(std::string fileName, FileContents contents)
 
     if (close(fd) != 0)
         error("close");
+
+    if (chmod(fileName.c_str(), st.st_mode) != 0)
+        error("chmod");
+
 }
 
 
