When setting PYTHONPATH, keep old stuff in it instead of overriding it.

1 files changed, 6 insertions, 1 deletions

diff --git a/seivot b/seivot
index dd80a79..7946ee2 100755
--- a/seivot
+++ b/seivot
@@ -165,7 +165,12 @@ class Obnam(BackupProgram):
             }
             env['OBNAM_PROFILE'] = self.settings['obnam-profile'] % namepattern
         if self._larch_branch:
-            env['PYTHONPATH'] = self._larch_branch
+            old = env['PYTHONPATH']
+            if old:
+                new = '%s:%s' % (self._larch_branch, old)
+            else:
+                new = self._larch_branch
+            env['PYTHONPATH'] = new
         if self.settings['encrypt-with']:
             cmd += ['--encrypt-with', self.settings['encrypt-with']]
         result = runcmd(cmd + args, cwd=self._branch, env=env, **kwargs)