From 9521b2b71fc133ac4163b8e3bf55504f37ce77b5 Mon Sep 17 00:00:00 2001
From: ChrisTimperley <christimperley@googlemail.com>
Date: Mon, 1 Jun 2020 17:23:56 -0400
Subject: [PATCH] bug fix: lack of defensive copying leads to crash when shell
 is used with mappingproxy

---
 CHANGELOG.rst              | 7 +++++++
 src/dockerblade/shell.py   | 2 +-
 src/dockerblade/version.py | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 418dfbd..e6d35b9 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,10 @@
+v0.5.1 (2020-06-01)
+-------------------
+
+* bug fix: lack of defensive copying in Shell constructor can lead to
+  crashes due to use of mappingproxy type.
+
+
 v0.5.0 (2020-05-29)
 -------------------
 
diff --git a/src/dockerblade/shell.py b/src/dockerblade/shell.py
index 4b1b876..491ed67 100644
--- a/src/dockerblade/shell.py
+++ b/src/dockerblade/shell.py
@@ -85,6 +85,7 @@ class Shell:
 
     def __attrs_post_init__(self) -> None:
         object.__setattr__(self, '_sources', tuple(self._sources))
+        object.__setattr__(self, '_environment', dict(self._environment))
 
         if self._sources:
             filesystem = self.container.filesystem()
@@ -312,7 +313,6 @@ def run(self,
         args_instrumented = self._instrument(args,
                                              time_limit=time_limit,
                                              kill_after=kill_after)
-
         with Stopwatch() as timer:
             retcode, output_bin = docker_container.exec_run(
                 args_instrumented,
diff --git a/src/dockerblade/version.py b/src/dockerblade/version.py
index 4543f94..8477183 100644
--- a/src/dockerblade/version.py
+++ b/src/dockerblade/version.py
@@ -1,2 +1,2 @@
 # -*- coding: utf-8 -*-
-__version__ = '0.5.0'
+__version__ = '0.5.1'