LinuxQuestions.org - [SOLVED] Reproducible builds. Chroot environment, date and config.

Hi all,

Looking for reproducible builds in the Slackware Sub-Forum I only found 3 threads.
One in 2015 other in 2016 and on 2021. But nothing relevant for mi question.

Maybe I'm little daring. Maybe I have to much free time. Maybe I hope Slackware can do it.

I am now playing with chroot to try made an environment for reproducible builds. From my understand to do a reproducible build there are 2 requirements, same date "SOURCE_DATE_EPOCH" and same environment.

I am not an expert on C, compiler, environments, ... So sorry if I'm very wrong.

From now i am trying to change the date on chroot to fix the SOURCE_DATE_EPOCH. I looking deeper to change the system date.

Code:

[root@arcadia sis]# unshare -T -- chroot /tmp/HugeSlackBuildchroot/ /bin/bash  --norc

bash-5.1# echo "boottime $((9*24*60*60)) 0" > /proc/$$/timens_offsets

bash-5.1# echo "monotonic $((2*24*60*60)) 0" > /proc/$$/timens_offsets

bash-5.1# uptime --pretty

up 4 weeks, 22 hours, 18 minutes

bash-5.1#

bash-5.1#

bash-5.1#

────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

[root@arcadia v]# uptime --pretty

up 2 weeks, 5 days, 22 hours, 19 minutes

[root@arcadia v]#

Can i have different date for chroot and system?

I installed desired packages on the chroot to build a random package and checksum it. Actually I use the random ncdu to test. I need the same packages installed on the environment rigth? That are trivial to install desired packages on a chroot. Done.

I appreciate if someone can point me in the right way.

I think containers are not the way, too heavy.

I am on a rabbit hole?

Can chroot do same as a container from the point of view of making a reproducible build? Construct same environment, date, etc...

How many thinks are needed on the environment to make a reproducible build?

From env:

Code:

[root@arcadia tmp]# env

SHELL=/bin/bash

WINDOWID=1258293

XDG_CONFIG_DIRS=/etc/xdg:/etc/kde/xdg

TERM_PROGRAM_VERSION=3.2a

TMUX=/tmp/tmux-0/default,4977,0

PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig:/usr/local/share/pkgconfig:/usr/lib64/pkgconfig:/usr/share/pkgconfig

GNOME_KEYRING_CONTROL=/home/xxx/.cache/keyring-3I7NI2

G_BROKEN_FILENAMES=1

HOSTNAME=arcadia.local

MINICOM=-c on

JAVA_HOME=/usr/lib64/zulu-openjdk8

SSH_AUTH_SOCK=/root/.ssh/ssh_auth_sock

ANT_HOME=/usr/share/ant

XDG_SEAT=seat0

PWD=/tmp

LOGNAME=root

XDG_SESSION_TYPE=tty

MANPATH=:/usr/lib64/zulu-openjdk11/man:/usr/lib64/zulu-openjdk8/man

UNO_PATH=/usr/lib64/libreoffice/program

XAUTHORITY=/root/.xauthasdG7U

LS_OPTIONS=-F -b -T 0 --color=auto

WINDOWPATH=1

HOME=/root

LANG=en_US.UTF-8

--squipped--

I need all the environment variables are the same? Can this be configured, automated, changed?

I am looking deeper on internet but some help are welcome.

I do not believe that I lost time if I do not get to a good end, at least I always learn something.

I wrote some garbage scripts in Github from which I am doing the tests. https://github.com/VielLosero/HugeSlackBuilds

All welcome.

Thanks in advance.

Edited: Maybe no the right forum

Viel.