X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/81e7eb42156a21e17d81c4a71d1dfee4f0fbd52f..d5508647a2dfd23684c08383fc18c77de3d1c825:/crunch_scripts/crunchutil/subst.py

diff --git a/crunch_scripts/crunchutil/subst.py b/crunch_scripts/crunchutil/subst.py
index b7336fa332..53def97f96 100644
--- a/crunch_scripts/crunchutil/subst.py
+++ b/crunch_scripts/crunchutil/subst.py
@@ -1,7 +1,14 @@
-import os
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 import glob
+import os
+import re
 import stat
 
+BACKSLASH_ESCAPE_RE = re.compile(r'\\(.)')
+
 class SubstitutionError(Exception):
     pass
 
@@ -41,7 +48,7 @@ def sub_file(v):
     if st and stat.S_ISREG(st.st_mode):
         return path
     else:
-        raise SubstitutionError("$(file {}) is not accessable or is not a regular file".format(path))
+        raise SubstitutionError("$(file {}) is not accessible or is not a regular file".format(path))
 
 def sub_dir(v):
     d = os.path.dirname(v)
@@ -52,7 +59,7 @@ def sub_dir(v):
     if st and stat.S_ISDIR(st.st_mode):
         return path
     else:
-        raise SubstitutionError("$(dir {}) is not accessable or is not a directory".format(path))
+        raise SubstitutionError("$(dir {}) is not accessible or is not a directory".format(path))
 
 def sub_basename(v):
     return os.path.splitext(os.path.basename(v))[0]
@@ -60,7 +67,7 @@ def sub_basename(v):
 def sub_glob(v):
     l = glob.glob(v)
     if len(l) == 0:
-        raise SubstitutionError("$(glob {}) no match fonud".format(v))
+        raise SubstitutionError("$(glob {}) no match found".format(v))
     else:
         return l[0]
 
@@ -73,7 +80,7 @@ def do_substitution(p, c, subs=default_subs):
     while True:
         m = search(c)
         if m is None:
-            return c
+            return BACKSLASH_ESCAPE_RE.sub(r'\1', c)
 
         v = do_substitution(p, c[m[0]+2 : m[1]])
         var = True