Comment from https://code.launchpad.net/~ken-vandine/ubuntu-system-
settings/lp1524424/+merge/280196
"How do applications know where to save data to? They write to a well
known directory under XDG_{CACHE,CONFIG,DATA}_HOME, so use that. Count
the logs and other stuff (if that actually does happen) as in use by the
system if it's too hard to do it any other way.
From
https://wiki.ubuntu.com/SecurityTeam/Specifications/ApplicationConfinement:
Applications will always have read access to their install directory
and have write access to directories they own as determined by the XDG
base directory specification. Specifically:
XDG_CACHE_HOME/<APP_PKGNAME>, XDG_RUNTIME_DIR/<APP_PKGNAME>,
XDG_RUNTIME_DIR/confined/<APP_PKGNAME> (for TMPDIR),
XDG_DATA_HOME/<APP_PKGNAME> and XDG_CONFIG_HOME/<APP_PKGNAME>. Apps
can discover these paths using standard APIs and appending the package
name as defined by the 'name' field of the manifest."
** Changed in: ubuntu-system-settings (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1454444
Title:
Storage view does not count correctly space used by app
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