Improve error reporting

dist-sync

@@ -285,7 +285,7 @@ class Repo:
                     return '%s: %s' % (self.name, l)
                 err = self.do_subprocess(source.split(), line_to_progress)
                 if err != 0:
-                    log('rsync failed with %d' % err)
+                    log('%s: rsync failed with %d' % (self.name, err))
                     pass
                 pass
             pass
@@ -348,7 +348,7 @@ class Repo:
                 return None
             err = self.do_subprocess(cmd, line_to_progress)
             if err != 0:
-                log('reposync failed with %d' % err)
+                log('%s: reposync failed with %d' % (self.name, err))
             rpms = read_rpms(destdir)
             self.after = rpms
 
@@ -410,14 +410,14 @@ class Repo:
                     return l
                 err = self.do_subprocess(cmd, line_to_progress)
                 if err != 0:
-                    log('createrepo failed with %d' % err)
+                    log('%s: createrepo failed with %d' % (self.name, err))
                     pass
                 if modules:
                     cmd = [ 'modifyrepo_c', '--mdtype=modules', modules,
                             './repodata' ]
                     err = self.do_subprocess(cmd, line_to_progress)
                     if err != 0:
-                        log('modifyrepo failed with %d' % err)
+                        log('%s: modifyrepo failed with %d' % (self.name, err))
                         pass
                     pass
                 pass