Directory at /proc/{PID}/root doesn't match root of the sandbox

[StandingPadAnimations]

While debugging some issues related to portals (https://github.com/flatpak/xdg-desktop-portal/issues/1076), it seems like the root folder in /proc/{PID} (where PID is the PID of the command ran by bwrap) doesn't match what is expected in the sandboxed environment, which causes issues when trying to use portals.

For instance, I have a .flatpak-info file in the root folder of the sandboxed environment (required for portals to work correctly), but said file does not appear in the root folder of /proc/{PID}.

Of course the program still reports the filesystem correctly, but other programs like xdg-desktop-portal will behave differently then intended

[rusty-snake]

WFM

Can you give more STR like bwrap command (as minimal as reproducible at best) and how you find the pid.

bwrap --unshare-all --share-net --symlink usr/lib /lib --symlink usr/lib64 /lib64 --symlink usr/bin /bin --symlink usr/sbin /sbin --ro-bind /usr /usr --ro-bind /etc /etc --dev /dev --proc /proc --dir /tmp --new-session --ro-bind-data 3 /.flatpak-info bash 3<<EOF 
[Application]
name=org.mozilla.firefox
EOF

$ ps -efH
[...]
rusty-snake    380653  [...]         bwrap --unshare-all --share-net --symlink usr/lib /lib --symlink usr/lib64 /lib64 --symlink usr/bin /bin --symlink usr/sbin /sbin --ro-bind /usr /usr --ro-bind /etc /etc --dev /d
rusty-snake    380654  [...]           bwrap --unshare-all --share-net --symlink usr/lib /lib --symlink usr/lib64 /lib64 --symlink usr/bin /bin --symlink usr/sbin /sbin --ro-bind /usr /usr --ro-bind /etc /etc --dev 
rusty-snake    380655  [...]             bash
               ^^^^^^
[...]
$ cat /proc/380655/root/.flatpak-info
[Application]
name=org.mozilla.firefox

required for portals to work correctly

• required for portals to work correctly with flatpaks
• for everything else that is not a flatpak, it is a hacky workaround to make one thing work and break two others or break your system (e.g. "if I copy it to my root directory as .flatpak-info, well things start getting funny with my desktop").
• Just to be clear that this is not something officially supported or recommended by the x-d-p authors.

[StandingPadAnimations]

Closing this since I realized it was user error