From e5ae916071a4e8467d7649a5cc700ca7310b6b69 Mon Sep 17 00:00:00 2001
From: Evan Martin <martine@danga.com>
Date: Fri, 7 Jan 2011 11:51:24 -0800
Subject: reread previous log on startup

---
 src/build_log.cc |  2 ++
 src/ninja.cc     | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/build_log.cc b/src/build_log.cc
index 06db0e6..ba09b46 100644
--- a/src/build_log.cc
+++ b/src/build_log.cc
@@ -52,6 +52,8 @@ void BuildLog::Close() {
 bool BuildLog::Load(const string& path, string* err) {
   FILE* file = fopen(path.c_str(), "r");
   if (!file) {
+    if (errno == ENOENT)
+      return true;
     *err = strerror(errno);
     return false;
   }
diff --git a/src/ninja.cc b/src/ninja.cc
index f88e2b9..a39ff5c 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -90,9 +90,17 @@ int main(int argc, char** argv) {
     return 0;
   }
 
+  const char* kLogPath = "ninja_log";
   BuildLog log;
-  if (!log.OpenForWrite("ninja_log", &err))
+  if (!log.Load(kLogPath, &err)) {
+    fprintf(stderr, "error loading build log: %s\n", err.c_str());
     return 1;
+  }
+
+  if (!log.OpenForWrite(kLogPath, &err)) {
+    fprintf(stderr, "error opening build log: %s\n", err.c_str());
+    return 1;
+  }
   config.build_log = &log;
 
   Builder builder(&state, config);
-- 
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