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a717428828
It's a variable set by procd that should replace hardcoded
/tmp/sysupgrade.tgz.
This change requires the most recent procd with the commit 0f3c136
("sysupgrade: set UPGRADE_BACKUP env variable").
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 641f6b6c26cb9ab5e1198810015e5f4b2b5b34ad)