useradd-staticids.bbclass: trigger reparsing when table files change

This addresses (among others) the following problem:
- USERADD_ERROR_DYNAMIC=error causes a recipe to get skipped
  because a static ID entry is missing
- the entry gets added to the file
- using the recipe still fails with the same error as before
  because the recipe gets loaded from the cache instead
  of re-parsing it with the new table content

(From OE-Core rev: 799c93592a9aac571d6dc05529437c0eec7b08b8)

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/useradd-staticids.bbclass

@@ -285,6 +285,19 @@ def update_useradd_static_config(d):
 
         return ";".join(newparams).strip()
 
+    # The parsing of the current recipe depends on the content of
+    # the files listed in USERADD_UID/GID_TABLES. We need to tell bitbake
+    # about that explicitly to trigger re-parsing and thus re-execution of
+    # this code when the files change.
+    bbpath = d.getVar('BBPATH', True)
+    for varname, default in (('USERADD_UID_TABLES', 'files/passwd'),
+                             ('USERADD_GID_TABLES', 'files/group')):
+        tables = d.getVar(varname, True)
+        if not tables:
+            tables = default
+        for conf_file in tables.split():
+            bb.parse.mark_dependency(d, bb.utils.which(bbpath, conf_file))
+
     # Load and process the users and groups, rewriting the adduser/addgroup params
     useradd_packages = d.getVar('USERADD_PACKAGES', True)