separate policies into individual modules

src/policy_ffwp.cpp

@@ -0,0 +1,79 @@
+/*
+   The MIT License (MIT)
+
+   Copyright (c) 2014 Antonio SJ Musumeci <trapexit@spawn.link>
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+   THE SOFTWARE.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <string>
+#include <vector>
+
+#include "policy.hpp"
+
+using std::string;
+using std::vector;
+using std::size_t;
+
+namespace mergerfs
+{
+  int
+  Policy::Func::ffwp(const vector<string> &basepaths,
+                     const string         &fusepath,
+                     const size_t          minfreespace,
+                     Paths                &paths)
+  {
+    Path fallback;
+
+    errno = ENOENT;
+    for(vector<string>::const_iterator
+          iter = basepaths.begin(), eiter = basepaths.end();
+        iter != eiter;
+        ++iter)
+      {
+        int         rv;
+        struct stat st;
+        string      fullpath;
+
+        fullpath = fs::make_path(*iter,fusepath);
+
+        rv = ::lstat(fullpath.c_str(),&st);
+        if(rv == 0)
+          {
+            paths.push_back(Path(*iter,fullpath));
+            return 0;
+          }
+        else if(errno == EACCES)
+          {
+            fallback.base = *iter;
+            fallback.full = fullpath;
+          }
+      }
+
+    if(!fallback.base.empty())
+      return (paths.push_back(fallback),0);
+
+    return -1;
+  }
+}