From: Egbert Eich <eich@suse.com>
Date: Thu Feb 4 09:17:55 2021 +0100
Subject: Fix error during documentation build due to recursive module inclusion
Patch-mainline: Not yet
Git-commit: 0239763866f506f34357b30e9d882d1e8a87211e
References: 

Signed-off-by: Egbert Eich <eich@suse.com>
---
 lib/spack/spack/build_environment.py | 3 ++-
 lib/spack/spack/environment.py       | 3 ++-
 lib/spack/spack/main.py              | 3 ++-
 lib/spack/spack/user_environment.py  | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/lib/spack/spack/build_environment.py b/lib/spack/spack/build_environment.py
index 3cf02dc..afd34c0 100644
--- a/lib/spack/spack/build_environment.py
+++ b/lib/spack/spack/build_environment.py
@@ -51,7 +51,8 @@
 import spack.build_systems.cmake
 import spack.build_systems.meson
 import spack.config
-import spack.main
+if not ( "spack.main" in sys.modules ):
+    import spack.main
 import spack.paths
 import spack.package
 import spack.repo
diff --git a/lib/spack/spack/environment.py b/lib/spack/spack/environment.py
index 7f7625f..e48929e 100644
--- a/lib/spack/spack/environment.py
+++ b/lib/spack/spack/environment.py
@@ -30,7 +30,8 @@
 import spack.util.spack_json as sjson
 import spack.util.spack_yaml as syaml
 import spack.config
-import spack.user_environment as uenv
+if not ( "spack.user_environment" in sys.modules ):
+    import spack.user_environment as uenv
 from spack.filesystem_view import YamlFilesystemView
 import spack.util.environment
 import spack.architecture as architecture
diff --git a/lib/spack/spack/main.py b/lib/spack/spack/main.py
index f4265a5..494a9ce 100644
--- a/lib/spack/spack/main.py
+++ b/lib/spack/spack/main.py
@@ -31,7 +31,8 @@
 import spack.architecture
 import spack.config
 import spack.cmd
-import spack.environment as ev
+if not ( "spack.environment" in sys.modules ):
+    import spack.environment as ev
 import spack.paths
 import spack.repo
 import spack.store
diff --git a/lib/spack/spack/user_environment.py b/lib/spack/spack/user_environment.py
index f08f21e..8925246 100644
--- a/lib/spack/spack/user_environment.py
+++ b/lib/spack/spack/user_environment.py
@@ -8,7 +8,8 @@
 import spack.config
 import spack.util.prefix as prefix
 import spack.util.environment as environment
-import spack.build_environment as build_env
+if not ( "spack.build_environment" in sys.modules ):
+    import spack.build_environment as build_env
 
 #: Environment variable name Spack uses to track individually loaded packages
 spack_loaded_hashes_var = 'SPACK_LOADED_HASHES'