recover from filesystem initialization error when user not in 'fuse' group

[Y Giridhar Appaji Nag]

If the user doesn't belong to the "fuse" group

$ uid=5908(giridhar) gid=100(users) groups=6(disk),24(cdrom),25(floppy),27(sudo),29(audio),44(video),100(users),104(nvram),105(thinkpad),112(powerdev),113(netdev),114(vmware)

$ pytagsfs -o format="/%g/%f" /media/usb/music/ pytagsfs
fuse: failed to open /dev/fuse: Permission denied
Traceback (most recent call last):
  File "/usr/bin/pytagsfs", line 20, in ?
    sys.exit(main())
  File "/usr/bin/pytagsfs", line 17, in main
    return fs.main()
  File "/usr/lib/python2.4/site-packages/pytagsfs/debug.py", line 83, in new_fn
    return fn(*args, **kwargs)
  File "/usr/lib/python2.4/site-packages/pytagsfs/debug.py", line 100, in new_fn
    retval = fn(*args, **kwargs)
  File "/usr/lib/python2.4/site-packages/pytagsfs/fs.py", line 455, in main
    retval = super(FileSystemMappingToRealFiles, self).main()
  File "/usr/lib/python2.4/site-packages/fuse.py", line 713, in main
    main(**d)
fuse.FuseError: filesystem initialization failed

[Y Giridhar Appaji Nag (appaji)]

Attached patch catches exceptions caused during init and logs an error.

If pytagsfs is run with the applied patch, the sessions looks like this:

$ pytagsfs -o format="/%g/%f" /media/usb/music/ pytagsfs
fuse: failed to open /dev/fuse: Permission denied

And running it in foreground (-f)

$ pytagsfs -o format="/%g/%f" /media/usb/music/ pytagsfs
fuse: failed to open /dev/fuse: Permission denied
error: are you a part of the fuse group?

[Y Giridhar Appaji Nag (appaji)]

> And running it in foreground (-f)
>
> $ pytagsfs -o format="/%g/%f" /media/usb/music/ pytagsfs

$ pytagsfs -f -o format="/%g/%f" /media/usb/music/ pytagsfs

[Forest Bond (forest-bond)]

Revision 392 in dev branch.

[Forest Bond (forest-bond)]

pytagsfs version 0.7.0rc1