* Added an option "fsync-metadata" to fsync() changes to

  /nix/var/nix/db.
* Removed the function writeStringToFile since it does (almost) the
  same thing as writeFile.

2 files changed, 4 insertions, 16 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 1b86e88d7ff3..711a969e4fc9 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -15,6 +15,7 @@
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #include "util.hh"
 
@@ -220,12 +221,13 @@ string readFile(const Path & path)
 }
 
 
-void writeFile(const Path & path, const string & s)
+void writeFile(const Path & path, const string & s, bool doFsync)
 {
     AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
     if (fd == -1)
         throw SysError(format("opening file `%1%'") % path);
     writeFull(fd, (unsigned char *) s.c_str(), s.size());
+    if (doFsync) fdatasync(fd);
 }
 
 
@@ -413,16 +415,6 @@ Paths createDirs(const Path & path)
 }
 
 
-void writeStringToFile(const Path & path, const string & s)
-{
-    AutoCloseFD fd(open(path.c_str(),
-        O_CREAT | O_EXCL | O_WRONLY, 0666));
-    if (fd == -1)
-        throw SysError(format("creating file `%1%'") % path);
-    writeFull(fd, (unsigned char *) s.c_str(), s.size());
-}
-
-
 LogType logType = ltPretty;
 Verbosity verbosity = lvlInfo;
 
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index a5d0445c14d4..837382433af9 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -62,7 +62,7 @@ string readFile(int fd);
 string readFile(const Path & path);
 
 /* Write a string to a file. */
-void writeFile(const Path & path, const string & s);
+void writeFile(const Path & path, const string & s, bool doFsync = false);
 
 /* Read a line from a file descriptor. */
 string readLine(int fd);
@@ -93,10 +93,6 @@ Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
    list of created directories, in order of creation. */
 Paths createDirs(const Path & path);
 
-/* Create a file and write the given text to it.  The file is written
-   in binary mode (i.e., no end-of-line conversions).  The path should
-   not already exist. */
-void writeStringToFile(const Path & path, const string & s);
 
 template<class T, class A>
 T singleton(const A & a)