[isar] reproducible build failures

[<Venkata.Pyla@toshiba-tsip.com>]

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Hi,

I am using isar system in isar-cip-core project [1] where I found some reproducible failures, which may be good to fix in the isar system.
I am not good in modifying the isar system, so could you please guide me to fix these problems?

Here are the steps to check the reproducible failures in isar-cip-core project:
https://gitlab.com/cip-project/cip-core/isar-cip-core/-/issues/12
https://gitlab.com/cip-project/cip-core/isar-cip-core/-/issues/13

I also verified the reproducibility in the isar system and found similar failures that are copied below:
==============================================
tmp/gpghomefHv8eRhk43/
tmp/gpghomefHv8eRhk43/private-keys-v1.d/
usr/share/doc/hello/changelog.Debian.gz
var/cache/debconf/config.dat
var/cache/debconf/config.dat-old
var/cache/ldconfig/aux-cache
var/lib/dpkg/info/enable-fsck.md5sums
var/lib/dpkg/info/example-raw.md5sums
var/lib/dpkg/info/hello.md5sums
var/lib/dpkg/info/isar-disable-apt-cache.md5sums
var/lib/dpkg/info/isar-exclude-docs.md5sums
var/lib/dpkg/info/sshd-regen-keys.md5sums
var/lib/initramfs-tools/4.19.0-17-amd64
var/lib/systemd/catalog/database
var/log/alternatives.log
var/log/bootstrap.log
var/log/dpkg.log
var/log/apt/history.log
var/log/apt/term.log
==============================================

Steps to check reproducible failures in isar
====================================
$ . isar-init-build-env ../build1 && bitbake mc:qemuamd64-buster-tgz:isar-image-base
$  . isar-init-build-env ../build2 && bitbake mc:qemuamd64-buster-tgz:isar-image-base
$ mkdir -p rootfs1 rootfs2
$ tar -xzvf ./build1/tmp/deploy/images/qemuamd64/isar-image-base-debian-buster-qemuamd64.tar.gz -C ./rootfs1/
$ tar -xzvf ./build2/tmp/deploy/images/qemuamd64/isar-image-base-debian-buster-qemuamd64.tar.gz -C ./rootfs2/
$ rsync -nrclv ./rootfs1/ ./rootfs2/ > difference.txt
====================================

>From the reproducible failures I found there are three different areas to fix these problem

1.       Changelog file generation, which is embedding the build time date value at here (https://github.com/ilbers/isar/blob/master/meta/classes/debianize.bbclass#L34 )

2.       Log files generated by different application, which are adding build time values, I think we can remove these files if it is not required after build. ( I tried at here https://github.com/ilbers/isar/blob/master/meta/classes/image.bbclass#L183 but it did not work)

3.       Cache and temporary files, I think we can delete these files also.

Please guide me to fix these issues.

Thanks,
Venkata.

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