[PATCH v2 0/2] Fix reproducibility of /etc/shadow file when image built on different days

[Adithya Balakumar <Adithya.Balakumar@toshiba-tsip.com>]

The third field in the /etc/shadow file (sp_lstchg) contains the date of
the last password change expressed as the number of days since Jan 1, 1970.
As this is a relative time, creating a user today will result in:

username:17238:0:99999:7:::
whilst creating the same user tomorrow will result in:

username:17239:0:99999:7:::

This impacts reproducibility of images when built on different days.

Since /etc/shadow honours SOURCE_DATE_EPOCH, this patchset makes the
SOURCE_DATE_EPOCH variable available when the /etc/shadow file is
created/modified.

Changes in v2:
- Replaced "! -z" with "-n" while checking for value of SOURCE_DATE_EPOCH
- Handle failure if bitbake var for SOURCE_DATE_EPOCH is empty

Adithya Balakumar (2):
  isar-bootstrap.inc: Export SOURCE_DATE_EPOCH variable
  image-account-extension.bbclass: Export SOURCE_DATE_EPOCH variable

 meta/classes/image-account-extension.bbclass        | 4 ++++
 meta/recipes-core/isar-bootstrap/isar-bootstrap.inc | 4 ++++
 2 files changed, 8 insertions(+)

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2.39.2