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

[Haris Okanovic]

On 12/05/2016 04:51 PM, Burton, Ross wrote:
>
> On 5 December 2016 at 21:48, Haris Okanovic <haris.okanovic at ni.com
> <mailto:haris.okanovic at ni.com>> wrote:
>
>     Opkg can defer running postinst scripts to first boot, which can take
>     a while on some systems. The output of `opkg configure` (or whatever pm
>     is used) is redirected to a file when logging is enabled
>     (I.e. $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
>     that they do not mistakenly reboot their machine.
>
>
> This isn't opkg specific, all backends can do it.

I wrote a more generic commit message in V2.

>
>
>     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.
>
>
> Are the alternatives not configured at rootfs time, so it should be fine
> to run tee?  (as if tee isn't safe, then neither is sed).

`tee` wasn't configured in Fido builds of NI Linux RT -- I.e. 
Busybox.postinst got deferred. I'm not sure if that's the OE default or 
the result of some distro-specific tweaks we made, but I decided not to 
rely on it for that reason. It's possible tee might work on some 
configurations.

I'm not sure why sed is significant. The only non-builtins in 
run-postinsts are update-rc.d, rm, and $pm.

>
> Ross