treewide: don't hardcode "sysupgrade.tgz" file name
1) Add BACKUP_FILE and use it when copying an archive to be restored
after sysupgrade (on the next preinit).
2) Use CONF_TAR for copying backup prepared by the /sbin/sysupgrade
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit bf39047872
)
v19.07.3_mercusys_ac12_duma
parent
f54bc3985a
commit
37caec2d5e
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