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6a6e25623a
On atomic, /home is a symlink to /var/home, which caused
problems in flatpak build when granting access to the homedir.
Due to a previous workaround (in 1aadc3ee40) we
make /var in the flatpak build sandbox be completely overridden
with $builddir/var so that the above symlink would not cause problems
in the persisted directory.
However, when we actually *want* to give access to that symlink this
causes problem.
In general, exposing /var in the sandbox has two uses:
* Allowing persisting tmpfiles in /var/tmp between individual
flatpak build commands (/tmp is per-build-command).
* Creating flatpaks from packages, such as rpms, where
we want to keep the rpm database (/var/lib/rpm) around during
the entire build so that dependencies can be resolved.
In order to handle these /var/home issues while still allowing
the above issues we instead persist only /var/tmp and /var/lib.
Fixes https://github.com/flatpak/flatpak/issues/1407
Closes: #1421
Approved by: alexlarsson