repoman: Update header check for Gentoo repo policy.

By decision of the Gentoo Council in its 2019-01-13 meeting, ebuilds
in the Gentoo repository MUST use the simplified form of the copyright
attribution according to GLEP 76, i.e.: "Copyright YEARS Gentoo Authors".

Update the header check accordingly, mostly by reverting to the
simpler single line check that was in place before commit c4096aff48.

Bug: https://bugs.gentoo.org/666330
Signed-off-by: Ulrich Müller <ulm@kph.uni-mainz.de>
Signed-off-by: Zac Medico <zmedico@gentoo.org>

2 files changed, 15 insertions, 31 deletions

diff --git a/repoman/cnf/linechecks/linechecks.yaml b/repoman/cnf/linechecks/linechecks.yaml
index 32b1bf82f..c452af07d 100644
--- a/repoman/cnf/linechecks/linechecks.yaml
+++ b/repoman/cnf/linechecks/linechecks.yaml
@@ -10,7 +10,6 @@ repoman_version: 2.3.3
 # scan module
 errors:
     COPYRIGHT_ERROR: 'Invalid Copyright on line: %d'
-    COPYRIGHT_DATE_ERROR: 'No copyright for last modification date before line %d'
     LICENSE_ERROR: 'Invalid Gentoo/GPL License on line: %d'
     ID_HEADER_ERROR: 'Stale CVS header on line: %d'
     NO_BLANK_LINE_ERROR: 'Non-blank line after header on line: %d'
diff --git a/repoman/lib/repoman/modules/linechecks/gentoo_header/header.py b/repoman/lib/repoman/modules/linechecks/gentoo_header/header.py
index c64674319..f94a8a50b 100644
--- a/repoman/lib/repoman/modules/linechecks/gentoo_header/header.py
+++ b/repoman/lib/repoman/modules/linechecks/gentoo_header/header.py
@@ -17,46 +17,31 @@ class EbuildHeader(LineCheck):
 
 	repoman_check_name = 'ebuild.badheader'
 
-	copyright_re = re.compile(r'^# Copyright ((1999|2\d\d\d)-)?(?P<year>2\d\d\d) \w')
+	gentoo_copyright = r'^# Copyright ((1999|2\d\d\d)-)?%s Gentoo Authors$'
 	gentoo_license = (
 		'# Distributed under the terms'
 		' of the GNU General Public License v2')
 	id_header_re = re.compile(r'.*\$(Id|Header)(:.*)?\$.*')
+	blank_line_re = re.compile(r'^$')
 	ignore_comment = False
 
 	def new(self, pkg):
 		if pkg.mtime is None:
-			self.modification_year = None
+			self.modification_year = r'2\d\d\d'
 		else:
-			self.modification_year = time.gmtime(pkg.mtime)[0]
-		self.last_copyright_line = -1
-		self.last_copyright_year = -1
+			self.modification_year = str(time.gmtime(pkg.mtime)[0])
+		self.gentoo_copyright_re = re.compile(
+			self.gentoo_copyright % self.modification_year)
 
 	def check(self, num, line):
-		if num > self.last_copyright_line + 2:
+		if num > 2:
 			return
-		elif num == self.last_copyright_line + 1:
-			# copyright can extend for a few initial lines
-			copy_match = self.copyright_re.match(line)
-			if copy_match is not None:
-				self.last_copyright_line = num
-				self.last_copyright_year = max(self.last_copyright_year,
-						int(copy_match.group('year')))
-			# no copyright lines found?
-			elif self.last_copyright_line == -1:
+		elif num == 0:
+			if not self.gentoo_copyright_re.match(line):
 				return self.errors['COPYRIGHT_ERROR']
-			else:
-				# verify that the newest copyright line found
-				# matches the year of last modification
-				if (self.modification_year is not None
-						and self.last_copyright_year != self.modification_year):
-					return self.errors['COPYRIGHT_DATE_ERROR']
-
-				# copyright is immediately followed by license
-				if line.rstrip('\n') != self.gentoo_license:
-					return self.errors['LICENSE_ERROR']
-		elif num == self.last_copyright_line + 2:
-			if self.id_header_re.match(line):
-				return self.errors['ID_HEADER_ERROR']
-			elif line.rstrip('\n') != '':
-				return self.errors['NO_BLANK_LINE_ERROR']
+		elif num == 1 and line.rstrip('\n') != self.gentoo_license:
+			return self.errors['LICENSE_ERROR']
+		elif num == 2 and self.id_header_re.match(line):
+			return self.errors['ID_HEADER_ERROR']
+		elif num == 2 and not self.blank_line_re.match(line):
+			return self.errors['NO_BLANK_LINE_ERROR']