[fix] Set locale to C when calling GNU tar to get more reproducible o…

…utput

Fixes #132

E.g. reproduce the bug with the script listed in #132

> sudo apt install language-pack-de
Need to get 3,340 kB of archives.
After this operation, 14.9 MB of additional disk space will be used.

> LANG=de_DE.UTF-8 LANGUAGE=de_De tar
tar: Eine der Optionen „-Acdtrux“, „--delete“ oder „--test-label“ ist notwendig
„tar --help“ oder „tar --usage“ gibt weitere Informationen.

> ls -la /usr/share/locale-langpack/de/LC_MESSAGES/tar.mo
-rw-r--r-- 1 root root 63827 Aug 19 16:50 /usr/share/locale-langpack/de/LC_MESSAGES/tar.mo

> LANG=de_DE.UTF-8 LANGUAGE=de_De bash issue-132.sh

ratarmount.py

@@ -1753,14 +1753,22 @@ def addToDeletionFile(deletionListFile, pathRelativeToRoot: str):
             print("Nothing to commit.")
             return
 
+        def runWithoutLocale(*args, **kwargs):
+            adjustedEnvironment = os.environ.copy()
+            for key in [k for k in adjustedEnvironment.keys() if k.startswith('LC_')]:
+                del adjustedEnvironment[key]
+            adjustedEnvironment['LC_LANG'] = 'C'
+            adjustedEnvironment['LANGUAGE'] = 'C'
+            return subprocess.run(*args, env=adjustedEnvironment, **kwargs)
+
         print()
         print("Committing is an experimental feature!")
         print('Please confirm by entering "commit". Any other input will cancel.')
         print("> ", end='')
         try:
             if input() == 'commit':
                 if os.stat(deletionList).st_size > 0:
-                    tarDelete = subprocess.run(
+                    tarDelete = runWithoutLocale(
                         [
                             "tar",
                             "--delete",
@@ -1788,7 +1796,7 @@ def addToDeletionFile(deletionListFile, pathRelativeToRoot: str):
                         raise RatarmountError("There were problems when trying to delete files.")
 
                 if os.stat(appendList).st_size > 0:
-                    subprocess.run(
+                    runWithoutLocale(
                         [
                             "tar",
                             "--append",