From: Egbert Eich <eich@suse.com>
Date: Wed Nov 10 09:40:47 2021 +0100
Subject: Fix error during documentation build due to recursive module inclusion
Patch-mainline: Not yet
Git-repo: https://github.com/spack/spack
Git-commit: ffc7c32398d3aad53a2f5700b6d6ddee9f0d8ef2
References: 

Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
 lib/spack/spack/build_environment.py       | 3 ++-
 lib/spack/spack/environment/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 83aa634276..3f32ed39cf 100644
--- a/lib/spack/spack/build_environment.py
+++ b/lib/spack/spack/build_environment.py
@@ -53,7 +53,8 @@
 import spack.build_systems.meson
 import spack.config
 import spack.install_test
-import spack.main
+if not ( "spack.main" in sys.modules ):
+    import spack.main
 import spack.package
 import spack.paths
 import spack.platforms
diff --git a/lib/spack/spack/environment/environment.py b/lib/spack/spack/environment/environment.py
index a6be5d1c50..a8d1008c46 100644
--- a/lib/spack/spack/environment/environment.py
+++ b/lib/spack/spack/environment/environment.py
@@ -32,7 +32,8 @@
 import spack.stage
 import spack.store
 import spack.subprocess_context
-import spack.user_environment as uenv
+if not ( "spack.user_environment" in sys.modules ):
+    import spack.user_environment as uenv
 import spack.util.cpus
 import spack.util.environment
 import spack.util.hash
diff --git a/lib/spack/spack/main.py b/lib/spack/spack/main.py
index 31a4bfe4ed..dfb2078d4f 100644
--- a/lib/spack/spack/main.py
+++ b/lib/spack/spack/main.py
@@ -36,7 +36,8 @@
 import spack
 import spack.cmd
 import spack.config
-import spack.environment as ev
+if not ( "spack.environment" in sys.modules ):
+    import spack.environment as ev
 import spack.modules
 import spack.paths
 import spack.platforms
diff --git a/lib/spack/spack/user_environment.py b/lib/spack/spack/user_environment.py
index 55f516b732..824583d2ef 100644
--- a/lib/spack/spack/user_environment.py
+++ b/lib/spack/spack/user_environment.py
@@ -5,7 +5,8 @@
 import os
 import sys
 
-import spack.build_environment
+if not ( "spack.build_environment" in sys.modules ):
+    import spack.build_environment
 import spack.config
 import spack.util.environment as environment
 import spack.util.prefix as prefix