#
#  To start with:
#      python svnfs.py http://somewhere/svn/repository mnt
#
#  Stop with Ctrl-C or with
#      lufsumount mnt
#


import py, os
import lufs

UID = os.getuid()
GID = os.getgid()


class Filesystem:

    def __init__(self, root):
        self.root = root
        self.paths = {}
        self.openfiles = {}

    def get(self, path):
        path = os.path.normpath(path)
        try:
            return self.paths[path]
        except KeyError:
            p = self.root.join(path.lstrip('/'))
            self.paths[path] = p
            return p

    def readdir(self, dir):
        d = self.get(dir)
        yield '.'
        yield '..'
        for d1 in d.listdir():
            self.paths[os.path.join(dir, d1.basename)] = d1
            yield d1.basename

    def stat(self, filename):
        print "stat", filename
        f = self.get(filename)
        try:
            info = f.info()
        except py.error.ENOENT:
            if f != self.root:
                raise
            return (0040500, 2, UID, GID, 512, 0, 0, 0)  # cannot info() root
        mtime = int(info.mtime)
        if info.kind == 'dir':
            return (0040500, 2, UID, GID, 512, mtime, mtime, mtime)
        else:
            return (0100400, 1, UID, GID, info.size, mtime, mtime, mtime)

    def open(self, filename, mode):
        f = self.get(filename)
        self.openfiles[filename] = f

    def release(self, filename):
        del self.openfiles[filename]

    def read(self, filename, offset, count):
        fd = self.openfiles[filename]
        if type(fd) is not str:
            fd = fd.read()
            self.openfiles[filename] = fd
        return fd[offset:offset+count]


# ____________________________________________________________

if __name__ == '__main__':
    import sys
    svnurl = py.path.svnurl(sys.argv[1])
    svnurl.listdir()   # check path
    lufs.mount(lambda: Filesystem(svnurl), sys.argv[2])