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base-files: prevent issues w/ overlay on powerloss after sysupgrade

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Due to filesystem write caching the old configuration data could stay
out of flash for a long time during a first boot after the sysupgrade.
Power loss during this period could damage the overlay data and even
make device inaccessable via the network.

Fix this by syncing data to a flash as soon as the previous
configuration will be unpacked after the sysupgrade. Also sync the FS
state after the sysupgrade.tgz archive removing to prevent duplicative
extraction of a previous configuration.

Tested with AMD Geode based board.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
This commit is contained in:
Sergey Ryazanov 2020-04-24 17:04:14 +03:00 committed by Petr Štetiar
parent 2171493f7f
commit 880c1f0336
2 changed files with 3 additions and 1 deletions
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2
package/base-files/files/etc/init.d/done
View File

@ -4,7 +4,7 @@
START=95 START=95
boot() { boot() {
mount_root done mount_root done
rm -f /sysupgrade.tgz rm -f /sysupgrade.tgz && sync
# process user commands # process user commands
[ -f /etc/rc.local ] && { [ -f /etc/rc.local ] && {

2
package/base-files/files/lib/preinit/80_mount_root
View File

@ -9,6 +9,8 @@ do_mount_root() {
echo "- config restore -" echo "- config restore -"
cd / cd /
tar xzf /sysupgrade.tgz tar xzf /sysupgrade.tgz
# Prevent configuration corruption on a power loss
sync
} }
} }