1 files changed, 116 insertions, 0 deletions
diff --git a/src/libnix/util.hh b/src/libnix/util.hh
new file mode 100644
index 000000000000..016289176be8
--- /dev/null
+++ b/src/libnix/util.hh
@@ -0,0 +1,116 @@
+#ifndef __UTIL_H
+#define __UTIL_H
+
+#include <string>
+#include <list>
+#include <set>
+#include <sstream>
+
+#include <unistd.h>
+
+#include <boost/format.hpp>
+
+using namespace std;
+using namespace boost;
+
+
+class Error : public exception
+{
+protected:
+    string err;
+public:
+    Error(const format & f);
+    ~Error() throw () { };
+    const char * what() const throw () { return err.c_str(); }
+    const string & msg() const throw () { return err; }
+};
+
+class SysError : public Error
+{
+public:
+    SysError(const format & f);
+};
+
+class UsageError : public Error
+{
+public:
+    UsageError(const format & f) : Error(f) { };
+};
+
+
+typedef list<string> Strings;
+typedef set<string> StringSet;
+
+
+/* Paths are just strings. */
+typedef string Path;
+typedef list<Path> Paths;
+typedef set<Path> PathSet;
+
+
+/* The canonical system name, as returned by config.guess. */ 
+extern string thisSystem;
+
+
+/* Return an absolutized path, resolving paths relative to the
+   specified directory, or the current directory otherwise.  The path
+   is also canonicalised. */
+Path absPath(Path path, Path dir = "");
+
+/* Canonicalise a path (as in realpath(3)). */
+Path canonPath(const Path & path);
+
+/* Return the directory part of the given path, i.e., everything
+   before the final `/'. */
+Path dirOf(const Path & path);
+
+/* Return the base name of the given path, i.e., everything following
+   the final `/'. */
+string baseNameOf(const Path & path);
+
+/* Return true iff the given path exists. */
+bool pathExists(const Path & path);
+
+/* 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);
+
+/* Make a path read-only recursively. */
+void makePathReadOnly(const Path & path);
+
+/* Create a temporary directory. */
+Path createTempDir();
+
+
+/* Messages. */
+
+typedef enum { 
+    lvlError, 
+    lvlTalkative,
+    lvlChatty,
+    lvlDebug,
+    lvlVomit
+} Verbosity;
+
+extern Verbosity verbosity; /* supress msgs > this */
+
+class Nest
+{
+private:
+    bool nest;
+public:
+    Nest(Verbosity level, const format & f);
+    ~Nest();
+};
+
+void msg(Verbosity level, const format & f);
+void debug(const format & f); /* short-hand for msg(lvlDebug, ...) */
+
+
+/* Wrappers arount read()/write() that read/write exactly the
+   requested number of bytes. */
+void readFull(int fd, unsigned char * buf, size_t count);
+void writeFull(int fd, const unsigned char * buf, size_t count);
+
+
+#endif /* !__UTIL_H */