Added SPACK_USER_CACHE_PATH export based on SPACK_ADMIN_CONFIG env variable

Author: atteggiani

tools/modules/spack/modulefile

@@ -78,4 +78,12 @@ if {[module-info mode load]} {
 }
 
 # Set 'spacktivate' alias
-set-alias spacktivate {spack env activate}
+set-alias spacktivate {spack env activate}
+
+# Set spack user cache path
+set spack_admin_config_env_var_name SPACK_ADMIN_CONFIG
+if { [info exists env($spack_admin_config_env_var_name)] } {
+    setenv SPACK_USER_CACHE_PATH "$base_dir/spack-admin-cache"
+} else {
+    setenv SPACK_USER_CACHE_PATH "/g/data/$env(PROJECT)/$env(USER)/spack/$module_version/spack-user-cache"
+}