sage -package fix-checksum: If sha256 is not available, create it

build/sage_bootstrap/app.py

@@ -373,7 +373,7 @@ def fix_checksum(self, package_name):
         if not os.path.exists(pkg.tarball.upstream_fqn):
             log.info('Ignoring {0} because tarball is not cached'.format(package_name))
             return
-        if pkg.tarball.checksum_verifies():
+        if pkg.tarball.checksum_verifies(force_sha256=True):
             log.info('Checksum of {0} (tarball {1}) unchanged'.format(package_name, pkg.tarball_filename))
         else:
             log.info('Updating checksum of {0} (tarball {1})'.format(package_name, pkg.tarball_filename))

build/sage_bootstrap/tarball.py

@@ -121,16 +121,19 @@ def _compute_sha256(self):
         import hashlib
         return self._compute_hash(hashlib.sha256())
 
-    def checksum_verifies(self):
+    def checksum_verifies(self, force_sha256=False):
         """
         Test whether the checksum of the downloaded file is correct.
         """
         if self.package.sha256:
             sha256 = self._compute_sha256()
             if sha256 != self.package.sha256:
                 return False
+        elif force_sha256:
+            log.warning('sha256 not available for {0}'.format(self.package.name))
+            return False
         else:
-            log.warning('sha1 used for {0} checksum'.format(self.package.name))
+            log.warning('sha256 not available for {0}, using sha1'.format(self.package.name))
         sha1 = self._compute_sha1()
         return sha1 == self.package.sha1