Generalize parse_file_list to allow handling Release files

Release files use different field names for checksum fields and the
set of allowed filenames is larger (slashes are allowed). This patch
allows switching the regexp used to validate filenames and the fields
for checksums to allow using parse_file_list not only for .dsc files,
but also for Release files.

daklib/upload.py

@@ -172,7 +172,7 @@ class HashedFile(object):
         if hashes.sha256 != self.sha256sum:
             raise InvalidHashException(self.filename, 'sha256sum', self.sha256sum, hashes.sha256)
 
-def parse_file_list(control, has_priority_and_section):
+def parse_file_list(control, has_priority_and_section, safe_file_regexp = re_file_safe, fields = ('Files', 'Checksums-Sha1', 'Checksums-Sha256')):
     """Parse Files and Checksums-* fields
 
     @type  control: dict-like
@@ -189,7 +189,7 @@ def parse_file_list(control, has_priority_and_section):
     """
     entries = {}
 
-    for line in control.get("Files", "").split('\n'):
+    for line in control.get(fields[0], "").split('\n'):
         if len(line) == 0:
             continue
 
@@ -202,26 +202,26 @@ def parse_file_list(control, has_priority_and_section):
 
         entries[filename] = entry
 
-    for line in control.get("Checksums-Sha1", "").split('\n'):
+    for line in control.get(fields[1], "").split('\n'):
         if len(line) == 0:
             continue
         (sha1sum, size, filename) = line.split()
         entry = entries.get(filename, None)
         if entry is None:
-            raise InvalidChangesException('{0} is listed in Checksums-Sha1, but not in Files.'.format(filename))
+            raise InvalidChangesException('{0} is listed in {1}, but not in {2}.'.format(filename, fields[1], fields[0]))
         if entry is not None and entry.get('size', None) != long(size):
-            raise InvalidChangesException('Size for {0} in Files and Checksum-Sha1 fields differ.'.format(filename))
+            raise InvalidChangesException('Size for {0} in {1} and {2} fields differ.'.format(filename, fields[0], fields[1]))
         entry['sha1sum'] = sha1sum
 
-    for line in control.get("Checksums-Sha256", "").split('\n'):
+    for line in control.get(fields[2], "").split('\n'):
         if len(line) == 0:
             continue
         (sha256sum, size, filename) = line.split()
         entry = entries.get(filename, None)
         if entry is None:
-            raise InvalidChangesException('{0} is listed in Checksums-Sha256, but not in Files.'.format(filename))
+            raise InvalidChangesException('{0} is listed in {1}, but not in {2}.'.format(filename, fields[2], fields[0]))
         if entry is not None and entry.get('size', None) != long(size):
-            raise InvalidChangesException('Size for {0} in Files and Checksum-Sha256 fields differ.'.format(filename))
+            raise InvalidChangesException('Size for {0} in {1} and {2} fields differ.'.format(filename, fields[0], fields[2]))
         entry['sha256sum'] = sha256sum
 
     files = {}
@@ -235,7 +235,7 @@ def parse_file_list(control, has_priority_and_section):
             raise InvalidChangesException('No sha1sum for {0}.'.format(filename))
         if 'sha256sum' not in entry:
             raise InvalidChangesException('No sha256sum for {0}.'.format(filename))
-        if not re_file_safe.match(filename):
+        if safe_file_regexp is not None and not safe_file_regexp.match(filename):
             raise InvalidChangesException("{0}: References file with unsafe filename {1}.".format(self.filename, filename))
         f = files[filename] = HashedFile(**entry)