Added a patch to patch.py to not change directories during patching.

- Legacy-Id: 14755

ietf/settings.py

@@ -946,6 +946,7 @@ CHECKS_LIBRARY_PATCHES_TO_APPLY = [
     'patch/fix-unidecode-argument-warning.patch',
     'patch/fix-faker-provider-ro-RO-string.patch',
     'patch/add-patch-already-patched-flag.patch',
+    'patch/fix-patch-no-chdir.patch',
 ]
 
 STATS_NAMES_LIMIT = 25

patch/fix-patch-no-chdir.patch

@@ -0,0 +1,47 @@
+--- patch.py.old	2018-03-09 07:53:37.586201595 -0800
++++ patch.py	2018-03-09 09:17:25.017418754 -0800
+@@ -804,10 +804,10 @@
+ 
+   def findfile(self, old, new):
+     """ return name of file to be patched or None """
+-    if exists(old):
+-      return old
+-    elif exists(new):
++    if exists(new):
+       return new
++    elif exists(old):
++      return old
+     else:
+       # [w] Google Code generates broken patches with its online editor
+       debug("broken patch from Google Code, stripping prefixes..")
+
+@@ -827,9 +827,6 @@
+         from file paths. `root` parameter specifies working dir.
+         return True on success
+     """
+-    if root:
+-      prevdir = os.getcwd()
+-      os.chdir(root)
+ 
+     total = len(self.items)
+     errors = 0
+
+@@ -854,6 +851,8 @@
+         new = pathstrip(p.target, strip)
+       else:
+         old, new = p.source, p.target
++      old = os.path.join(root, old)
++      new = os.path.join(root, new)
+ 
+       filename = self.findfile(old, new)
+ 
+
+@@ -956,9 +955,6 @@
+             # todo: proper rejects
+             shutil.move(backupname, filename)
+ 
+-    if root:
+-      os.chdir(prevdir)
+-
+     # todo: check for premature eof
+     return (errors == 0)