[gegl] Use python to get envvar instead of trying to concat with bash

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 2cde4679b9e84de71e277637a10f9289f7093a68
Author: Félix Piédallu <felix piedallu me>
Date:   Tue Feb 18 13:25:11 2020 +0100

    Use python to get envvar instead of trying to concat with bash

 bin/lua/meson.build      |  2 +-
 tests/python/meson.build | 17 +++++++++++------
 2 files changed, 12 insertions(+), 7 deletions(-)
---
diff --git a/bin/lua/meson.build b/bin/lua/meson.build
index 61ffcd710..8f067f1cb 100644
--- a/bin/lua/meson.build
+++ b/bin/lua/meson.build
@@ -28,6 +28,6 @@ lua_files = files(
 if lua.found()
   install_data(
     lua_files,
-    install_dir: get_option('datadir') /  api_name / 'lua'
+    install_dir: get_option('datadir') / api_name / 'lua'
   )
 endif
diff --git a/tests/python/meson.build b/tests/python/meson.build
index bd1451118..1bb69ead3 100644
--- a/tests/python/meson.build
+++ b/tests/python/meson.build
@@ -7,18 +7,23 @@ testnames = [
   'gegl',
 ]
 
+ld_library_path = run_command(python, '-c',
+  '''import os; print(os.environ['LD_LIBRARY_PATH'])'''
+).stdout().strip()
+gi_typelib_path = run_command(python, '-c',
+  '''import os; print(os.environ['GI_TYPELIB_PATH'])'''
+).stdout().strip()
+
 if python.found() and pygobject_found
   foreach testname : testnames
     testfile = 'test-' + testname + '.py'
     test(testname,
-      bash,
-      args: [
-        '-c',
-        'LD_LIBRARY_PATH='+ meson.build_root() / 'gegl' + ':$LD_LIBRARY_PATH',
-        'GI_TYPELIB_PATH='+ meson.build_root() / 'gegl' + ':$GI_TYPELIB_PATH',
+      find_program(testfile),
+      env: [
+        'LD_LIBRARY_PATH='+ meson.build_root() / 'gegl' + ':' + ld_library_path,
+        'GI_TYPELIB_PATH='+ meson.build_root() / 'gegl' + ':' + gi_typelib_path,
         'GEGL_PATH='      + meson.build_root() / 'operations',
         'GEGL_SWAP=RAM',
-        python.path(), files(testfile),
       ],
       suite: 'python',
       is_parallel: false,