[ptxdist] [PATCH] rc-once: make sure data makes it to the medium

[Robert Schwebel <r.schwebel@pengutronix.de>]

We have seen that, if the first boot runs under a testsuite that powers
the board off after rc-once is finished, data hasn't found its way to
the medium. This has been observed to result in an empty ssh key.

Adding a sync helps.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
---
 projectroot/usr/lib/systemd/systemd-rc-once | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/projectroot/usr/lib/systemd/systemd-rc-once b/projectroot/usr/lib/systemd/systemd-rc-once
index e14936e40..db3d84e3c 100644
--- a/projectroot/usr/lib/systemd/systemd-rc-once
+++ b/projectroot/usr/lib/systemd/systemd-rc-once
@@ -21,6 +21,8 @@ start() {
 }
 
 umount() {
+	# make sure rc-once generated data makes it to the medium
+	sync
 	if ! mount_root_restore; then
 		# remounting rw/ro during the second boot will flush anything
 		# left in the filesystem journal
-- 
2.27.0


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