Merge pull request #476 from gnurag/master

[toyFS] Added a toy filesystem.

toyFS/README.md

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+# toyfs
+Toy filesystem based on FUSE
+
+## Installation
+  yum install fuse fuse-python
+
+## Mounting toyFS
+  python toyfs.py /path/to/mount/point
+
+## Unmounting
+  fusermount -u /path/to/mount/point

toyFS/toy.py

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+import fuse
+import stat
+import errno
+import time
+
+class ToyStat(fuse.Stat):
+    def __init__(self):
+        """
+        The following stat structure members are implemented.
+        """
+        self.st_mode  = 0      # (protection bits)
+        self.st_ino   = 0      # (inode number)
+        self.st_dev   = 0      # (device)
+        self.st_nlink = 0      # (number of hard links)
+        self.st_uid   = 500    # (user ID of owner)
+        self.st_gid   = 500    # (group ID of owner) 
+        self.st_size  = 0      # (size of file, in bytes)
+        self.st_atime = 0      # (time of most recent access)
+        self.st_mtime = 0      # (time of most recent content modification)
+        self.st_ctime = 0      # (time of most recent metadata change)
+
+# Helper for Toy filesystem
+class Toy():
+    def __init__(self):
+        self.data = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. In augue sapien, congue fermentum tortor ut, consequat maximus posuere.\n'
+
+    def getattr(self, path):
+        st = ToyStat()
+        if path.endswith('.txt'):
+            st.st_mode = stat.S_IFREG | 0644
+            st.st_size = len(self.data)
+        else:
+            st.st_mode = stat.S_IFDIR | 0755
+        return st
+
+    def readdir(self, path):
+        contents = {
+            '/':           ['hello', 'world', 'docs'],
+            '/hello':      ['welt'],
+            '/hello/welt': ['last_level'],
+            '/docs':       ['readme.txt']
+        }
+        res = ['.','..'] + contents.get(path)
+        return res
+
+    def read(self, path, length, offset):
+        return self.data
+

toyFS/toyfs.py

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+#!/usr/bin/env python
+
+import os
+import logging
+import fuse
+import time
+
+import toy
+
+fuse.fuse_python_api = (0, 2)
+
+# Logging
+logger    = logging.getLogger("toyfs")
+handler   = logging.FileHandler('toyfs.log')
+logger.addHandler(handler)
+logger.setLevel(logging.INFO)
+
+fs = toy.Toy()
+
+# toyFS
+class ToyFS(fuse.Fuse):
+    def getattr(self, path):
+        logger.info("[getattr] (path=%s)" % path)
+        st = fs.getattr(path)
+        return st
+
+    def readdir(self, path, offset):            
+        logger.info("[readdir] (path=%s, offset=%s)" % (path, offset))
+        directories = fs.readdir(path)
+        for directory in directories:
+            yield fuse.Direntry(directory)
+
+    def open(self, path, flags):
+        logger.info("[open] (path=%s, flags=%s)" % (path, flags))
+
+    def read(self, path, length, offset):
+        logger.info("[read] (path=%s, length=%s, offset=%s)" % (path, length, offset))
+        return fs.read(path, length, offset)
+
+if __name__ == '__main__':
+    toyfs = ToyFS(version = '%prog ' + '0.0.1',
+               usage = 'Toy filesystem ' + fuse.Fuse.fusage,
+               dash_s_do = 'setsingle')
+    toyfs.parse(errex = 1)
+    toyfs.flags = 0
+    toyfs.multithreaded = 0
+    toyfs.main()