[PATCH xorg-gtest 2/2] Check if log file and old log file are writable before starting X server

[Chase Douglas]

Otherwise, the server will fail to start and it won't be obvious what
happened.

Signed-off-by: Chase Douglas <chase.douglas at canonical.com>
---
 src/environment.cpp |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/environment.cpp b/src/environment.cpp
index 68e05ce..a3a8ead 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -36,6 +36,7 @@
 #include <csignal>
 #include <cstdlib>
 #include <cstring>
+#include <fstream>
 #include <iostream>
 #include <stdexcept>
 
@@ -114,6 +115,31 @@ void xorg::testing::Environment::SetUp() {
     throw std::runtime_error(message);
   }
 
+  /* The Xorg server won't start unless the log file and the old log file are
+   * writable. */
+  std::ofstream log_test;
+  log_test.open(d_->path_to_log_file.c_str(), std::ofstream::out);
+  log_test.close();
+  if (log_test.fail()) {
+    std::string message;
+    message += "X.org server log file ";
+    message += d_->path_to_log_file;
+    message += " is not writable.";
+    throw std::runtime_error(message);
+  }
+
+  std::string old_log_file = d_->path_to_log_file.c_str();
+  old_log_file += ".old";
+  log_test.open(old_log_file.c_str(), std::ofstream::out);
+  log_test.close();
+  if (log_test.fail()) {
+    std::string message;
+    message += "X.org old server log file ";
+    message += old_log_file;
+    message += " is not writable.";
+    throw std::runtime_error(message);
+  }
+
   d_->process.Start(d_->path_to_server, d_->path_to_server.c_str(),
                     display_string,
                     "-logfile", d_->path_to_log_file.c_str(),
-- 
1.7.9.5