Makefile: add target to update .checkpackageignore

When a developer fixes an ignored warning from check-package, he/she
needs to update .checkpackageignore
By running './utils/docker-run make check-package' the developer
receives a warning about this.
Make that change easier to make, by adding a helper target on Makefile.

Add an option --failed-only to check-package that generates output in
the format:
<filename> <check_function> [<check_function> ...]
This is the very same format used by check-package ignore file.

Add the phony target .checkpackageignore

So one can update the ignore file using:
$ ./utils/docker-run make .checkpackageignore

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Makefile

@@ -1261,6 +1261,11 @@ check-package:
 		-a -not -name '*.orig' -a -not -name '*.rej' \
 		-exec ./utils/check-package --exclude=Sob {} +
 
+.PHONY: .checkpackageignore
+.checkpackageignore:
+	find $(TOPDIR) -type f \( -name '*.mk' -o -name '*.hash' -o -name 'Config.*' -o -name '*.patch' \) \
+		-exec ./utils/check-package --exclude=Sob --failed-only {} > .checkpackageignore +
+
 include docs/manual/manual.mk
 -include $(foreach dir,$(BR2_EXTERNAL_DIRS),$(sort $(wildcard $(dir)/docs/*/*.mk)))
 

utils/check-package

@@ -63,11 +63,17 @@ def parse_args():
                         help="do not run the specified functions (debug)")
     parser.add_argument("--dry-run", action="store_true", help="print the "
                         "functions that would be called for each file (debug)")
+    parser.add_argument("--failed-only", action="store_true", help="print only"
+                        " the name of the functions that failed (debug)")
 
     flags = parser.parse_args()
 
     flags.ignore_list = get_ignored_parsers_per_file(flags.intree_only, flags.ignore_filename)
 
+    if flags.failed_only:
+        flags.dry_run = False
+        flags.verbose = -1
+
     return flags
 
 
@@ -221,6 +227,11 @@ def check_file_using_lib(fname):
                   .format(fname, should_fail, flags.ignore_filename))
             nwarnings += 1
 
+    if flags.failed_only:
+        if len(failed) > 0:
+            f = " ".join(sorted(failed))
+            print("{} {}".format(fname, f))
+
     return nwarnings, nlines
 
 
@@ -259,7 +270,7 @@ def __main__():
         print("{} lines processed".format(total_lines), file=sys.stderr)
         print("{} warnings generated".format(total_warnings), file=sys.stderr)
 
-    if total_warnings > 0:
+    if total_warnings > 0 and not flags.failed_only:
         sys.exit(1)