sysupgrade immediately reboots after flashing an image and doesn't
allow to unmount filesystems. At least in case the image used for
sysupgrade is stored on a FAT formatted usb flash drive, the following
warning is printed during the next mount of the flash drive:

FAT-fs (sda1): Volume was not properly unmounted. Some data may be
corrupt. Please run fsck.

Although a data corruption during read operations is unlikely, there is
no need to scare the users.

Signed-off-by: Mathias Kresin <d...@kresin.me>
---
 package/base-files/files/lib/upgrade/common.sh | 1 +
 package/system/procd/files/nand.sh             | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/package/base-files/files/lib/upgrade/common.sh 
b/package/base-files/files/lib/upgrade/common.sh
index ea03f77..bed9c18 100644
--- a/package/base-files/files/lib/upgrade/common.sh
+++ b/package/base-files/files/lib/upgrade/common.sh
@@ -243,6 +243,7 @@ do_upgrade() {
        [ -n "$DELAY" ] && sleep "$DELAY"
        ask_bool 1 "Reboot" && {
                v "Rebooting system..."
+               umount -a
                reboot -f
                sleep 5
                echo b 2>/dev/null >/proc/sysrq-trigger
diff --git a/package/system/procd/files/nand.sh 
b/package/system/procd/files/nand.sh
index 8b0564d..70b9af5 100644
--- a/package/system/procd/files/nand.sh
+++ b/package/system/procd/files/nand.sh
@@ -198,6 +198,7 @@ nand_do_upgrade_success() {
        sync
        [ -f "$conf_tar" ] && nand_restore_config "$conf_tar"
        echo "sysupgrade successful"
+       umount -a
        reboot -f
 }
 
@@ -213,6 +214,7 @@ nand_upgrade_ubinized() {
 
        if [ ! "$mtdnum" ]; then
                echo "cannot find mtd device $CI_UBIPART"
+               umount -a
                reboot -f
        fi
 
-- 
2.7.4


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