Public bug reported:

If I run "df" it starts with an error message:

[parent]: df
df: /run/user/4410/doc: Operation not permitted
Filesystem     1K-blocks     Used Available Use% Mounted on
tmpfs            1630320     1604   1628716   1% /run
.....

The /run/user/4410/doc (mode r-x------) has been created by:

/usr/libexec/xdg-document-portal

started by:

/lib/systemd/systemd --user

using:

/usr/lib/systemd/user/xdg-document-portal.service


I'm not sure why this is there, but i appear to have no control over it.

It should not result in simple tools such as df producing error messages
just because it exists.

/proc/mounts shows it as:

portal /run/user/4410/doc fuse.portal
rw,nosuid,nodev,relatime,user_id=4410,group_id=1001 0 0

If it is a required mount then perhaps df should be made to ignore
portal mounts by default?

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: xdg-desktop-portal 1.8.0-1
ProcVersionSignature: Ubuntu 5.8.0-31.33-generic 5.8.17
Uname: Linux 5.8.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Dec  4 02:09:11 2020
InstallationDate: Installed on 2020-05-03 (214 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: xdg-desktop-portal
UpgradeStatus: Upgraded to groovy on 2020-10-26 (39 days ago)

** Affects: xdg-desktop-portal (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

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https://bugs.launchpad.net/bugs/1906744

Title:
  xdg-document-portal creates a mountpoint which produces an error
  report from df

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