[cip-dev][isar-cip-core][PATCH v2 01/13] initramfs-crypt-hook: Allow switching between clevis and systemd

[Quirin Gylstorff <Quirin.Gylstorff@siemens.com>]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

This allows device which started on Debian 11 to continue using
clevis for encryption and decryption.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../initramfs-crypt-hook_0.1.bb                    | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/recipes-initramfs/initramfs-crypt-hook/initramfs-crypt-hook_0.1.bb b/recipes-initramfs/initramfs-crypt-hook/initramfs-crypt-hook_0.1.bb
index b275c0f..317ea12 100644
--- a/recipes-initramfs/initramfs-crypt-hook/initramfs-crypt-hook_0.1.bb
+++ b/recipes-initramfs/initramfs-crypt-hook/initramfs-crypt-hook_0.1.bb
@@ -1,7 +1,7 @@
 #
 # CIP Core, generic profile
 #
-# Copyright (c) Siemens AG, 2020-2023
+# Copyright (c) Siemens AG, 2020-2024
 #
 # Authors:
 #  Quirin Gylstorff <quirin.gylstorff@siemens.com>
@@ -17,7 +17,17 @@ CLEVIS_DEPEND = ", clevis-luks, jose, bash, luksmeta, file, libpwquality-tools"
 
 DEBIAN_DEPENDS:append:buster = "${CLEVIS_DEPEND}, libgcc-7-dev"
 DEBIAN_DEPENDS:append:bullseye = "${CLEVIS_DEPEND}"
-DEBIAN_DEPENDS:append = ", systemd (>= 251) | clevis-tpm2"
+DEBIAN_DEPENDS:append = "${@encryption_dependency(d)}"
+
+def encryption_dependency(d):
+    crypt_backend = d.getVar('CRYPT_BACKEND')
+    if crypt_backend == 'clevis':
+        clevis_depends= d.getVar('CLEVIS_DEPEND')
+        return f"{clevis_depends}, clevis-tpm2"
+    elif crypt_backend == 'systemd':
+        return ", systemd (>= 251)"
+    else:
+        bb.error("unkown cryptbackend defined")
 
 CRYPT_BACKEND:buster = "clevis"
 CRYPT_BACKEND:bullseye = "clevis"
-- 
2.43.0