[PATCH v3 0/4] Allow multiple keyspecs in one environment variable

[Jonas Rebmann <jre@pengutronix.de>]

This contains the actual change to keytoc as well a migration Note.

Allowing any number of public keys to be provided via a single
environment variable eases integration in more complex setups where
multiple public keys per keyring are managed externally.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
---
Changes in v3:
- Where possible, split refactoring/cleanup into a preparatory commit
- Split copying strsep_unescape into a separate commit
- Link to v2: https://lore.barebox.org/barebox/20260218-keytoc-multi-env-v2-0-3ea146c95d18@pengutronix.de

Changes in v2:
- Split up the keyspec environment variables when multiple are provided
  too.
- Use strsep_unescape instead of manual split/unescape
- Remove RFC tag
- Link to v1: https://lore.barebox.org/barebox/20260206-keytoc-multi-env-v1-1-638fbf2b3634@pengutronix.de

---
Jonas Rebmann (4):
      scripts: include: Add string_util.h for strsep_unescaped
      crypto: keytoc: Improve readability
      crypto: keytoc: Split env-provided full keyspec on spaces
      Documentation: migration-guides: Document change in keyspec env vars

 .../migration-guides/migration-master.rst          | 17 +++++
 scripts/include/string_util.h                      | 65 +++++++++++++++++++
 scripts/keytoc.c                                   | 72 +++++++++++++++-------
 3 files changed, 133 insertions(+), 21 deletions(-)
---
base-commit: ff814eff55e898037503e942df8e0ba8f1b13222
change-id: 20260206-keytoc-multi-env-4a3300292e4a

Best regards,
--  
Jonas Rebmann <jre@pengutronix.de>