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To: openwrt-devel@lists.openwrt.org
From: "R. Diez" <rdiezmail-openwrt@yahoo.com>
Subject: Random PARTUUID on every rebuild
Message-ID: <940f0b3a-4187-4f19-08db-43003ddc031b@yahoo.com>
Date: Sat, 16 Feb 2019 19:13:59 +0100
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Hi all:

I am still an OpenWrt newbie. I am also trying to figure out why it takes so long to rebuild, even if you make no changes at all. This is part of my 
research for this bug:

FS#2096 - A second 'make' always rebuilds something
https://bugs.openwrt.org/index.php?do=details&task_id=2096

The one thing I noticed is that there is a random PARTUUID for the X86_64 target, and that it gets regenerated on every (re)build. This makes the 
image different every time, even if nothing has changed.

Is there a reason why this partition ID has to be random? Such things make it impossible to do repeatable builds.

The code is here:

     target/linux/x86/image/Makefile

     SIGNATURE:=$(shell perl -e 'printf("%08x", rand(0xFFFFFFFF))')

Thanks in advance,
   rdiez

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