xrgtn / nullfs Goto Github PK

Some trackers require a minimum download traffic for a certain time.

So far I have always been able to download torrents to nullfs. I have used qBittorrent or Deluge to do this. Strangely recently I am no longer able to do this. What happens:

The torrent client starts downloading, gets about 10-15Mb of data and shows an error message about the local file.

I tried recompiling nullfs, thinking that it might have become incompatible with newer system libs. Unfortunately, that didn't help and the issue remains.

What could be the reason?
How come so far this worked but not any more?

alec@greenlane:~/nullfs$ make nulnfs
cc "-lfuse" nulnfs.c -o nulnfs
nulnfs.c: In function ‘alloc_dirent’:
nulnfs.c:118:13: warning: format ‘%i’ expects argument of type ‘int’, but argument 5 has type ‘__off64_t’ [-Wformat]
nulnfs.c: In function ‘nullfs_ll_opendir’:
nulnfs.c:222:14: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
nulnfs.c:224:9: warning: format ‘%i’ expects argument of type ‘int’, but argument 3 has type ‘fuse_ino_t’ [-Wformat]
nulnfs.c: In function ‘nullfs_ll_readdir’:
nulnfs.c:284:9: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 5 has type ‘uint64_t’ [-Wformat]
/tmp/ccCcyBFJ.o: In function nullfs_ll_lookup': nulnfs.c:(.text+0x610): undefined reference tofuse_reply_err'
nulnfs.c:(.text+0x75c): undefined reference to fuse_reply_entry' /tmp/ccCcyBFJ.o: In functionnullfs_ll_opendir':
nulnfs.c:(.text+0x798): undefined reference to fuse_reply_err' nulnfs.c:(.text+0x7b0): undefined reference tofuse_reply_err'
nulnfs.c:(.text+0x7f7): undefined reference to fuse_reply_err' nulnfs.c:(.text+0x847): undefined reference tofuse_reply_open'
/tmp/ccCcyBFJ.o: In function calculate_ls_buf': nulnfs.c:(.text+0x8fd): undefined reference tofuse_dirent_size'
/tmp/ccCcyBFJ.o: In function nullfs_ll_readdir': nulnfs.c:(.text+0x9b2): undefined reference tofuse_reply_err'
nulnfs.c:(.text+0x9ca): undefined reference to fuse_reply_err' nulnfs.c:(.text+0xa11): undefined reference tofuse_reply_err'
nulnfs.c:(.text+0xa7f): undefined reference to fuse_reply_err' nulnfs.c:(.text+0xb36): undefined reference tofuse_reply_buf'
nulnfs.c:(.text+0xb5e): undefined reference to fuse_reply_err' nulnfs.c:(.text+0xbd8): undefined reference tofuse_add_direntry'
nulnfs.c:(.text+0xc4b): undefined reference to fuse_reply_buf' /tmp/ccCcyBFJ.o: In functionnullfs_ll_getattr':
nulnfs.c:(.text+0xc93): undefined reference to fuse_reply_err' nulnfs.c:(.text+0xccc): undefined reference tofuse_reply_attr'
/tmp/ccCcyBFJ.o: In function main': nulnfs.c:(.text+0x10dc): undefined reference tofuse_parse_cmdline'
nulnfs.c:(.text+0x10fb): undefined reference to fuse_mount' nulnfs.c:(.text+0x1125): undefined reference tofuse_lowlevel_new'
nulnfs.c:(.text+0x113c): undefined reference to fuse_set_signal_handlers' nulnfs.c:(.text+0x1154): undefined reference tofuse_session_add_chan'
nulnfs.c:(.text+0x1160): undefined reference to fuse_session_loop' nulnfs.c:(.text+0x116f): undefined reference tofuse_remove_signal_handlers'
nulnfs.c:(.text+0x117b): undefined reference to fuse_session_remove_chan' nulnfs.c:(.text+0x1187): undefined reference tofuse_session_destroy'
nulnfs.c:(.text+0x11a6): undefined reference to fuse_unmount' nulnfs.c:(.text+0x11b2): undefined reference tofuse_opt_free_args'
collect2: error: ld returned 1 exit status
make: *** [nulnfs] Error 1

alec@greenlane:~/nullfs$ make nul1fs
cc "-lfuse" nul1fs.c -o nul1fs
/tmp/ccY5WKz3.o: In function main': nul1fs.c:(.text+0x3c3): undefined reference tofuse_main_real'
collect2: error: ld returned 1 exit status
make: *** [nul1fs] Error 1

Imagine that we have user "user" with uid=500 in group "group" with gid 500.
One can mount nul1fs to some place with uid and gid options. There is no problems here.

[root@host nullfs]# ./nul1fs -o uid=500,gid=500 /tmp/nul1fs
[root@host nullfs]# ls -lad /tmp/nul1fs
drwxrwxrwx 2 user group 0 Мар  6 16:43 /tmp/nul1fs

But later when we want to read or write something to this directory we will get "Permission denied"

[root@host nullfs]# su - user
[user@host ~]$ touch /tmp/nul1fs/sdf
touch: cannot touch `/tmp/nul1fs/sdf': Permission denied
[user@host ~]$ ls /tmp/nul1fs
ls: /tmp/nul1fs: Permission denied

But from "root" account we still can read and write as usual. And it returns us file with user:group ownerships.

[user@host nullfs]# ls -la /tmp/nul1fs/sdfdsf
-rw-rw-rw- 1 user group 0 Мар  6 17:04 /tmp/nul1fs/sdfdsf

I've installed libfuse-dev, downloaded zip, extracted it and ran make nul1fs, result is below:

gendalph@namo:~/nullfs-master$ make nul1fs
cc   "-lfuse"  nul1fs.c   -o nul1fs
/tmp/ccKSs0Ur.o: In function `main':
nul1fs.c:(.text+0x4ae): undefined reference to `fuse_main_real'
collect2: ld returned 1 exit status
make: *** [nul1fs] Error 1

Workaround was to install pkg-config and compiling manually.

gcc -Wall -o nul1fs nul1fs.c $(pkg-config fuse --cflags --libs)

My workaround: adding these to Makefile

CFLAGS = -Wall `pkg-config fuse --cflags --libs`

nul1fs:
        gcc -o nul1fs nul1fs.c $(CFLAGS)