Initial Python version

Dockerfile

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+FROM python:onbuild
+
+ENTRYPOINT [ "python", "./volume-backup.py" ]

volume-backup.py

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+import os
+import sys
+import tarfile
+import shutil
+
+
+volume_dir = "/volume"
+backup_dir = "/backup"
+tmp_dir = "/tmp"
+data_dir = "data"
+
+
+def backup(archive_name):
+    with tarfile.open(backup_dir + "/" + archive_name, "w:bz2") as tar:
+        #TODO maybe instead of tarbomb copy to backup or archive_name
+        #     but then make sure permissions work (copy2 doesn't keep them)
+        tar.add(volume_dir, ".")
+
+
+def restore(archive_name):
+
+    for f in os.listdir(volume_dir):
+        fp = volume_dir + "/" + f
+        if os.path.isfile(fp):
+            os.unlink(fp)
+        elif os.path.isdir(fp):
+            shutil.rmtree(fp)
+        else:
+            raise Exception("Neither a file nor a directory: " + fp)
+    
+    with tarfile.open(backup_dir + "/" + archive_name, "r:bz2") as tar:
+        #TODO: validate if archive contains only relative paths and no ..
+        #TODO: numeric_owner will cause trouble when using uid mapping - make it configurable
+        tar.extractall(volume_dir, numeric_owner=True)
+
+
+def usage():
+    print("Usage: volume-backup <backup|restore> <archive>")
+    exit(1)
+
+def main():
+    if not os.path.isdir(volume_dir):
+        print(volume_dir + " directory does not exist")
+    if not os.path.isdir(backup_dir):
+        print(backup_dir + " directory does not exist")
+    
+    #TODO: validate that volume is not used, list containers / names
+
+    if not len(sys.argv) == 3:
+        usage()
+    
+    operation = sys.argv[1]
+
+    archive_name = sys.argv[2]
+    if not archive_name.endswith(".tar.bz2"):
+        archive_name += ".tar.bz2"
+
+    if operation == "backup":
+        backup(archive_name)
+    elif operation == "restore":
+        restore(archive_name)
+    else:
+        usage()
+
+if __name__ == "__main__":
+    main()