diff --git a/docs/sphinx/index.rst b/docs/sphinx/index.rst
index 75121ca..bcb5e5b 100644
--- a/docs/sphinx/index.rst
+++ b/docs/sphinx/index.rst
@@ -267,13 +267,15 @@ Optimization
 
 Uberenv also features options to optimize the installation
 
- ===================== ============================================== ================================================
-  Option               Description                                    Default
- ===================== ============================================== ================================================
-  ``--mirror``         Location of a Spack mirror                     **None**
-  ``--create-mirror``  Creates a Spack mirror at specified location   **None**
-  ``--upstream``       Location of a Spack upstream                   **None**
- ===================== ============================================== ================================================
+ ====================== ============================================== ================================================
+  Option                Description                                    Default
+ ====================== ============================================== ================================================
+  ``--mirror``          Location of a Spack mirror                     **None**
+  ``--create-mirror``   Creates a Spack mirror at specified location   **None**
+  ``--upstream``        Location of a Spack upstream                   **None**
+  ``--mirror-autopush`` Push binaries to mirror as they are built      False
+  ``--trust-key``       Load the gpg key(s) to the Spack gpg keyring   **None**
+ ====================== ============================================== ================================================
 
 .. note::
     These options are only currently available for spack.
diff --git a/uberenv.py b/uberenv.py
index f1143dd..f9fda20 100755
--- a/uberenv.py
+++ b/uberenv.py
@@ -122,6 +122,12 @@ def parse_args():
                       default=None,
                       help="spack mirror directory")
 
+    parser.add_argument("--mirror-autopush",
+                       action="store_true",
+                       dest="mirror_autopush",
+                       default=False,
+                       help="Use spack v0.22+ --autopush functionality for binary cache mirrors")
+
     # flag to create mirror
     parser.add_argument("--create-mirror",
                       action="store_true",
@@ -293,6 +299,13 @@ def parse_args():
                       default=None,
                       help="Path to Spack Environment file (e.g. spack.yaml or spack.lock)")
 
+    # option to add trusted keys to spack gpg keyring
+    parser.add_argument("--trust-key",
+                      dest="key_paths",
+                      action="append",
+                      default=None,
+                      help="Add the gpg keys to the spack gpg keyring")
+
     ###############
     # parse args
     ###############
@@ -407,7 +420,7 @@ def setup_paths_and_dirs(self):
 
     def set_from_args_or_json(self,setting, optional=True):
         """
-        When optional=False: 
+        When optional=False:
             If the setting key is not in the json file, error and raise an exception.
         When optional=True:
             If the setting key is not in the json file or args, return None.
@@ -425,7 +438,7 @@ def set_from_args_or_json(self,setting, optional=True):
 
     def set_from_json(self,setting, optional=True):
         """
-        When optional=False: 
+        When optional=False:
             If the setting key is not in the json file, error and raise an exception.
         When optional=True:
             If the setting key is not in the json file or args, return None.
@@ -509,7 +522,7 @@ def clone_repo(self):
 
             os.chdir(self.dest_dir)
 
-            clone_args = ("-c http.sslVerify=false " 
+            clone_args = ("-c http.sslVerify=false "
                           if self.args["ignore_ssl_errors"] else "")
 
             clone_cmd =  "git {0} clone --single-branch -b {1} {2} vcpkg".format(clone_args, vcpkg_branch,vcpkg_url)
@@ -1057,7 +1070,7 @@ def install(self):
                 print("[ERROR: Failure of spack install]")
                 return res
 
-        # when using install or uberenv-pkg mode, create a symlink to the host config 
+        # when using install or uberenv-pkg mode, create a symlink to the host config
         if self.build_mode == "install" or \
            self.build_mode == "uberenv-pkg" \
            or self.use_install:
@@ -1157,6 +1170,7 @@ def use_mirror(self):
         mirror_name = self.pkg_name
         mirror_path = self.get_mirror_path()
         existing_mirror_path = self.find_spack_mirror(mirror_name)
+        autopush = "--autopush" if self.args["mirror_autopush"] else ""
 
         if existing_mirror_path and mirror_path != existing_mirror_path:
             # Existing mirror has different URL, error out
@@ -1171,8 +1185,8 @@ def use_mirror(self):
             existing_mirror_path = None
         if not existing_mirror_path:
             # Add if not already there
-            sexe("{0} mirror add --scope=defaults {1} {2}".format(
-                    self.spack_exe(), mirror_name, mirror_path), echo=True)
+            sexe("{0} mirror add --scope=defaults {1} {2} {3}".format(
+                    self.spack_exe(), autopush, mirror_name, mirror_path), echo=True)
             print("[using mirror {0}]".format(mirror_path))
 
     def find_spack_upstream(self, upstream_name):
@@ -1257,6 +1271,15 @@ def setup_clingo(self):
                 print("[ERROR: Clingo install failed with returncode {0}]".format(res))
                 sys.exit(-1)
 
+    def trust_gpg_keys(self):
+        """
+        Tells spack to trust the gpg keys in key_paths.
+        """
+        key_paths = self.args["key_paths"]
+        for key_path in key_paths:
+            key_path = pabs(key_path)
+            print("[adding gpg key to spack gpg keyring]")
+            sexe("{0} gpg trust {1}".format(self.spack_exe(use_spack_env=False), key_path), echo=True)
 
 def find_osx_sdks():
     """
@@ -1334,6 +1357,10 @@ def main():
         # Patch the package manager, as necessary
         env.patch()
 
+        # Trust keys if the option was provided
+        if args["key_paths"]:
+            env.trust_gpg_keys()
+
         # Clean the build
         env.clean_build()