Permissions issue qBittorrent file creation when preload library is used in docker instance about mergerfs HOT 9 CLOSED

Tested preload-tmpfile on both x86_64 and aarch64, and it seems that the problem is resolved. Repeating the steps above, the files previously created with missing permissions are now created with the expected permissions. I tested the build against qbittorrent in docker for aarch64 and both qbittorrent docker and standalone qbittorrent for x86_64. Many thanks!

from mergerfs.

Probably something to do with a specific arm call. I don't have a Pi4. I'll have to see if any of my SBCs are ARM64 to check.

from mergerfs.

It'd help me a lot if you provide a strace of qbittorrent when this happens.

from mergerfs.

If you check my edit in Additional context, I was able to reproduce the issue on Arch x86_64, so I think we can eliminate ARM as a factor.

I didn't provide a strace initially, as I wasn't sure how to capture the strace at the right time for a docker-launched process, so here's a strace captured from a standalone launch of qbittorrent.

Steps to reproduce

$ killall qbittorrent
$ rm -rf .local/share/qBittorrent/ .config/qBittorrent
$ strace -fvTtt -s 256 -o /tmp/qbittorrent.strace.txt -E LD_PRELOAD=/usr/lib/mergerfs/preload.so qbittorrent
(Accept legal notice and close app)
$ find .local/share/qBittorrent/ .config/qBittorrent -perm 0
.local/share/qBittorrent/GeoDB/dbip-country-lite.mmdb
.config/qBittorrent/categories.json
.config/qBittorrent/rss/feeds.json
.config/qBittorrent/watched_folders.json

To reiterate, there is no mergerfs mount active on my system, and the .local and .config folders are on a standard ext4 volume.

strace log captured via above steps:
qbittorrent.strace.txt

from mergerfs.

To reiterate, there is no mergerfs mount active on my system,

Sure. This is to do with the preload.

Thank you for the trace. It's almost certainly due to qbittorrent using O_TMPFILE. I'll see what I can do about it.

from mergerfs.

What OS package are you using? I'll build one for you to test changes.

from mergerfs.

I'm using mergerfs built locally via the Arch AUR (on the aarch64 and on x86_64 alike). If it's easier for you, I can make a test build myself if you point me to the diff or test branch.

from mergerfs.

Branch preload-tmpfile

from mergerfs.

Addressed in v2.40.2

from mergerfs.