* Automatically upgrade <= 0.7 Nix stores to the new schema (so that

  existing user environments continue to work).
* `nix-store --verify': detect incomplete closures.  

2 files changed, 12 insertions, 0 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 2fb3e9ee6853..27df7a1aaa52 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -185,6 +185,15 @@ string readFile(const Path & path)
 }
 
 
+void writeFile(const Path & path, const string & s)
+{
+    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());
+}
+
+
 static void _deletePath(const Path & path)
 {
     checkInterrupt();
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index c7f117129f17..b67913862408 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -94,6 +94,9 @@ Strings readDirectory(const Path & path);
 string readFile(int fd);
 string readFile(const Path & path);
 
+/* Write a string to a file. */
+void writeFile(const Path & path, const string & s);
+
 /* Delete a path; i.e., in the case of a directory, it is deleted
    recursively.  Don't use this at home, kids. */
 void deletePath(const Path & path);