[PATCH v2] run-postinsts: Print message before running deferred postinst scripts

[Haris Okanovic <haris.okanovic@ni.com>]

Package managers can defer running postinst scripts to first boot, which
can take a while on some systems. E.g. The output of `opkg configure`
(or whatever pm is used) is redirected to a file when logging is enabled
($POSTINST_LOGGING == 1), making the machine appear hung during this
process. This change simply prints a wait message on the console to
inform the user of this potentially long and silent operation so they do
not mistakenly reboot the machine.

Why not simply `tee` the output instead?

Tee might be provided by BusyBox in some distros, which may need to run
update-alternatives in the very postinst scripts being executed by this
process. It's therefore not safe to assume Tee (or any other packaged
util) is available until the configure process finishes.

Signed-off-by: Haris Okanovic <haris.okanovic@ni.com>
---
 meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts b/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts
index 04ba394..660ddc2 100755
--- a/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts
+++ b/meta/recipes-devtools/run-postinsts/run-postinsts/run-postinsts
@@ -46,6 +46,9 @@ if [ -z "$pi_dir" ]; then
 	exit 0
 fi
 
+echo "Configuring packages on first boot...."
+echo " (This may take several minutes. Please do not power off the machine.)"
+
 [ -e #SYSCONFDIR#/default/postinst ] && . #SYSCONFDIR#/default/postinst
 
 if [ "$POSTINST_LOGGING" = "1" ]; then
-- 
2.10.1