Make rcb dump env vars to properly escape them

src/restic_compose_backup/__init__.py

@@ -1 +1 @@
-__version__ = '0.6.0'
+__version__ = '0.7.1'

src/restic_compose_backup/cli.py

@@ -51,6 +51,9 @@ def main():
     elif args.action == "crontab":
         crontab(config)
 
+    elif args.action == "dump-env":
+        dump_env()
+
     # Random test stuff here
     elif args.action == "test":
         nodes = utils.get_swarm_nodes()
@@ -290,6 +293,14 @@ def crontab(config):
     print(cron.generate_crontab(config))
 
 
+def dump_env():
+    """Dump all environment variables to a script that can be sourced from cron"""
+    print("#!/bin/bash")
+    print("# This file was generated by restic-compose-backup")
+    for key, value in os.environ.items():
+        print("export {}='{}'".format(key, value))
+
+
 def parse_args():
     parser = argparse.ArgumentParser(prog='restic_compose_backup')
     parser.add_argument(
@@ -303,6 +314,7 @@ def parse_args():
             'cleanup',
             'version',
             'crontab',
+            'dump-env',
             'test',
         ],
     )