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-rw-r--r--rdiff-backup/rdiff_backup/backup.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/rdiff-backup/rdiff_backup/backup.py b/rdiff-backup/rdiff_backup/backup.py
index 2f5c9e4..6284a6b 100644
--- a/rdiff-backup/rdiff_backup/backup.py
+++ b/rdiff-backup/rdiff_backup/backup.py
@@ -707,7 +707,9 @@ class IncrementITRB(PatchITRB):
self.base_rp, inc_prefix = longname.get_mirror_inc_rps(
self.CCPP.get_rorps(index), self.basis_root_rp, self.inc_root_rp)
self.base_rp.setdata()
- assert diff_rorp.isdir() or self.base_rp.isdir()
+ assert diff_rorp.isdir() or self.base_rp.isdir(), \
+ ("Either %s or %s must be a directory" % (repr(diff_rorp.path),
+ repr(self.base_rp.path)))
if diff_rorp.isdir():
inc = increment.Increment(diff_rorp, self.base_rp, inc_prefix)
if inc and inc.isreg():