initial code commit

src/access.cpp

@@ -0,0 +1,85 @@
+/*
+   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.
+*/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <fuse.h>
+
+#include <string>
+#include <vector>
+
+#include <unistd.h>
+#include <errno.h>
+
+#include "ugid.hpp"
+#include "fs.hpp"
+#include "config.hpp"
+#include "assert.hpp"
+
+using std::string;
+using std::vector;
+using mergerfs::Policy;
+
+static
+int
+_access(const Policy::Search::Func  searchFunc,
+        const vector<string>       &srcmounts,
+        const string                fusepath,
+        const int                   mask)
+{
+  int rv;
+  string path;
+
+  path = searchFunc(srcmounts,fusepath).full;
+  if(path.empty())
+    return -ENOENT;
+
+  rv = ::eaccess(path.c_str(),mask);
+
+  return ((rv == -1) ? -errno : 0);
+}
+
+namespace mergerfs
+{
+  namespace access
+  {
+    int
+    access(const char *fusepath,
+           int         mask)
+    {
+      const ugid::SetResetGuard  ugid;
+      const config::Config      &config = config::get();
+
+      if(fusepath == config.controlfile)
+        return 0;
+
+      return _access(config.policy.search,
+                     config.srcmounts,
+                     fusepath,
+                     mask);
+    }
+  }
+}