The chromium snap is strictly confined, and that means that it cannot
read/write to hidden directories inside the user's home folder (such as
$HOME/.config or $HOME/.cache). That's a security feature to prevent
snap applications from reading other applications' data.
Instead, as you've found out, the app gets its own home directory
located at $HOME/snap/chromium/current. The application itself does
respect the XDG base directory specification, but with a rewritten
$HOME.
Now, you mention the cache data. That one is stored in
$HOME/chromium/common/.cache/. The default profile directory is stored
in $HOME/chromium/common/chromium/.
The transitional package does copy over an existing profile from
$HOME/.config/chromium if it exists the first time the snap is being
run.
Given all this, I'm not really sure what the bug really is about? Can
you share concrete use cases?
** Changed in: chromium-browser (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1887804
Title:
chromium-browser does not follow XDG base directory specification
Status in chromium-browser package in Ubuntu:
Incomplete
Bug description:
Currently Chromium does not follow the XDG base directory
specification which means that the cache and configuration folder
aren't properly used.
This causes the issue that it's nearly impossible to properly migrate
or back up Chromium configuration (between computers) and it makes for
example mounting cache as tmpfs or wiping it very very difficult.
I felt those both immensely when trying to migrate my home folder,
gigabytes of cache in ~/snap/chromium/[id]/.config/chromium/[folder]
(and ~/snap itself is also not XDG base directory specification
compliant, shame!).
There's also the issue that the previous configuration that is located
properly, isn't migrated by the migrational package.
In order to fix this bug, it would require making the snap package
follow the XDG base directory specification.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1887804/+subscriptions
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