[PATCH v2] image-account-extenstion: rebuild on varflag changes

["B. Niedermayr" <benedikt.niedermayr@siemens.com>]

From: Benedikt Niedermayr <benedikt.niedermayr@siemens.com>

When adding items (e.g. foo) to the USER or GROUP variables, the
buildsystem automatically creates new variables (USER_foo).
One can then set these variables, or more precise, the variable
flags (e.g. USER_foo[password]) to control differents aspects
of the user creation.
Isar does not trigger a rebuild when applying changes to these
variable flags since they are not recognized by the
tasks signature generation.

The same applies to the USERS and GROUPS variables as well as
for the SOURCE_DATE_EPOCH variable.

Signed-off-by: Benedikt Niedermayr <benedikt.niedermayr@siemens.com>
---
 meta/classes/image-account-extension.bbclass | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/meta/classes/image-account-extension.bbclass b/meta/classes/image-account-extension.bbclass
index 3d4e1d1dd175..4ab0aae87015 100644
--- a/meta/classes/image-account-extension.bbclass
+++ b/meta/classes/image-account-extension.bbclass
@@ -8,6 +8,18 @@
 USERS ??= ""
 GROUPS ??= ""
 
+python() {
+    d.appendVarFlag("image_postprocess_accounts", "vardeps", " USERS GROUPS SOURCE_DATE_EPOCH")
+
+    for entry in (d.getVar("GROUPS") or "").split():
+        group_entry = "GROUP_{}".format(entry)
+        d.appendVarFlag("image_postprocess_accounts", "vardeps", " {}".format(group_entry))
+
+    for entry in (d.getVar("USERS") or "").split():
+        user_entry = "USER_{}".format(entry)
+        d.appendVarFlag("image_postprocess_accounts", "vardeps", " {}".format(user_entry))
+}
+
 def image_create_groups(d: "DataSmart") -> None:
     """Creates the groups defined in the ``GROUPS`` bitbake variable.
 
@@ -134,7 +146,7 @@ python image_postprocess_accounts() {
     import os
     if d.getVar("SOURCE_DATE_EPOCH") != None:
         os.environ["SOURCE_DATE_EPOCH"] = d.getVar("SOURCE_DATE_EPOCH")
- 
+
     image_create_groups(d)
     image_create_users(d)
 }
-- 
2.34.1