[rb-general] How to modify mount-time and write when you write in a file system

Andres Pavez apavez.zavala at gmail.com
Wed Jul 12 01:36:54 CEST 2017

Hi All,
I am new here and I think this reproducible build initiative is awesome.
I hope you can help me with some advice in a project I am working
because I am running out of ideas and options.

Goal: Create a custom reproducible Lice CD based in a exiting live cd
- This is because you can diffoscope the exiting live cd with my
custom live cd and see that the different is just my software and the
OS is the original from this live cd and is widely public available.

Why Live CD: Because I use a Laptop without hard drive to prove that
nothing can be copied or modify, also the laptop don't have internet
connection - Perception to promote open and transparency in the

Problem: during the creation/reproduction of the custom live cd, when
i use "mount' to mount the filesystem to copy my sw inside of the
rootfs (after unsquashfs) i noted usign tune2fs every time i mont the
file system the values "last mount time", "last write time" and
"Lifetime writes" changes and i don't know how to fix it.

With tune2fs i can only  fix the "Mount Count", but no the mount time
and writes.

Other: To build the live cd I am using mksquashfs with
"-mkfs-fixed-time" and "-content-fixed-time" options and xorriso with
"modification-date" option and it is works. but the problem is the
File System.

Thanks and best regards,
Andrés Pavez

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