Torrents names

FYI, the filename limitations on the Linux is 255 bytes instead of characters. The maximum path length is 4096 bytes.
The situation is worse when the filename contains multibyte characters (for example, CJK characters basically uses 3 bytes in UTF-8). The effective filename may be 100 characters long.

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Some torrents with very long file names are not downloadable: “file name too long” #7038

unam56 opened this issue Jul 2, 2017 · 12 comments

Some torrents with very long file names are not downloadable: “file name too long” #7038

unam56 opened this issue Jul 2, 2017 · 12 comments

OS: Linux Issues specific to Linux distributions Waiting info Waiting for participants to supply more info/fulfill template requirements

Comments

unam56 commented Jul 2, 2017 •
edited by sledgehammer999

qBittorrent version: 3.3.13, 64 bit.
OS: Ubuntu Linux 16.04.
Qt version: 5.5.1.
libtorrent version: 1.0.11.0.
boost version: 1.58.0.
PPA: http://ppa.launchpad.net/qbittorrent-team/qbittorrent-stable/ubuntu

Problem

qBitTorrent under Linux can’t download files for most torrent files, created under OS Windows, because ext4 and ntfs have different maximum name length limit.

Expected behavior

Provide two modes:

  • auto rename;
  • manual rename.

Auto rename mode: rename files automatically; show list of auto renamed files in gui; allow user rerename files manually in gui.

Manual rename mode: if name too long, generate temp short name, continue download, show dialog to choose name manually by user, rename file, continue download.

Steps to reproduce

  • Download torrent file, created under OS Windows.
  • Run qBitTorrent.
  • Open torrent file.
  • Start downloading.
  • Wait some time.
  • See message “An I/O error occured, ” paused. file (/path/to/file) error: File name too long” in log tab.
  • Press “Content” button in gui, rename long name manually to short name, choose “Resume” context menu item to continue downloading. This will not help. See the same message in log tab.
  • Press “Content” button in gui, uncheck checkbox to prevent download file with long name, choose “Resume” context menu item to continue downloading. This will not help. See the same message in log tab.
  • Choose “Set location. ” context menu item and give path to ntfs mount point, choose “Resume” context menu item to continue downloading. Some time ever this hack will not help. See the same message in log tab.

Current behavior

  • qBitTorrent paused ever if long name files was manually renamed.
  • qBitTorrent paused ever if long name files was manually unckecked.
  • Some times qBitTorrent paused ever if download location is ntfs mount point.

Expected behavior

Automatically map ntfs long names to ext4 short names.

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The text was updated successfully, but these errors were encountered:

thalieht added the OS: Windows Issues specific to Windows label Sep 5, 2019
bathrobehero commented Oct 26, 2019

Why is this still haven’t fixed.

icemtel commented Dec 18, 2019

I am also experiencing this on v4.2.1

Alanoll commented Jan 21, 2020 •

Just curious if anyone has tried using the \\?\ path method.
It seemed to fix my torrents when the path exceeded MAX_PATH.

UNC paths would be \\?\UNC\ServerName\Share instead of \\ServerName\Share
Local paths would be \\?\C:\Path\To\Torrent\Folder instead of C:\Path\To\Torrent\Folder

tsangwpx commented Jun 4, 2020 •

Please note that the issue is on Linux. Wrong label was assigned.
I am not sure whether the issue is fixed or not.

FYI, the filename limitations on the Linux is 255 bytes instead of characters. The maximum path length is 4096 bytes.
The situation is worse when the filename contains multibyte characters (for example, CJK characters basically uses 3 bytes in UTF-8). The effective filename may be 100 characters long.

To solve the issue on Linux, a long name should be automatically renamed/mapped to a legal identifiable one with shorter length.

FranciscoPombal added OS: Linux Issues specific to Linux distributions and removed OS: Windows Issues specific to Windows labels Jun 6, 2020

FranciscoPombal changed the title Most windows torrents not downloadable because “file name too long” Jun 6, 2020

FranciscoPombal changed the title Torrents not downloadable because “file name too long” with very long path names Jun 6, 2020

FranciscoPombal changed the title Some torrents with very long file names are not downloadable because “file name too long” with very long path names Jun 6, 2020

FranciscoPombal commented Jun 6, 2020

This is a filesystem-level limitation common to all mainstream linux filesystems, so I would say it’s out of scope for qBittorrent to try to work around that.

If someone creates a torrent where filenames are close to or exceed 255 ASCII characters or ~100 CJK characters, they did a bad job. Such torrents are not only a problem for qBittorrent, but for every other tool (like btcheck ) in the ecosystem. So creating a workaround for this in qBittorrent is just a band-aid. The real fix would be to prevent torrent creator tools from creating files that are incompatible with mainstream filesystems (this includes qBittorrent built-in torrent creator, if it does this). Or go ask for ext5 with longer file names or something.

tsangwpx commented Jun 7, 2020

After grep -ing for a while, the filename too long issue should be solved long time ago.
The libtorrent author mentioned it. https://blog.libtorrent.org/2014/12/filenames/

On Linux, long filename is truncated around 240 bytes plus proper extension.

I confirmed this behavior with qBittorrent 4.1.5 on debian buster.

BTW, the Windows likely limits 255 character in UTF-16 and the conversion from UTF-16 to UTF-8 likely cause longer filename. The filename limits are unlikely changed in the future because it is not only defined in the filesystem but also in the Linux kernel headers. Yet, naming file with really long name isnt good.

a0193143 commented Feb 26, 2022

I found this issue when I move from Windows to TrueNAS.
I thought it was TrueNAS’s problem that cause file missing, but after digging a while it was because the filename in torrent cutted.
According to Libtorrent’s source code, it would cut the file name to 240 bytes if there’s extension.
In my opnion this has to be “if the whole filename exceed 255 bytes then cut”, my file is IN the directory (which whole filename is 243 bytes), but because it cutted and renamed, qb can’t find my file.
Hope this could be fixed.

ferenczy commented Jul 20, 2023 •

I’m having the same problem, but at a different point, I would say. I’m not even able to start the downloading. If I understand the OP correctly, in his case, he’s able to start the download of such a file and the error happens later, at some time during the downloading or when the download is finished (and the file is being copied from the temporary directory to the target location, I guess).

In my case, I’m not even able to start the download of the majority of files. When I click on “Download” in the file’s context menu, nothing happens. When I click on “Open the download window“, the Download window is not even opened, I get the error message immediately:

Failed to load the torrent: .
Error: File name too long

I have tried it now and it happened in 100% of cases (16 torrents).

I’m using qBittorrent 4.4.1 on Ubuntu 22.04.2.

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