[devhelp] meson: post-install: do nothing if DESTDIR env variable set

[Sébastien Wilmet <swilmet src gnome org>]

commit b39229740f1e2a57e89579ab2516b0f6234ec979
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Mar 23 10:15:25 2018 +0100

    meson: post-install: do nothing if DESTDIR env variable set
    
    If DESTDIR was set, the commands were not executed in the good
    directories.

 meson_post_install.py |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/meson_post_install.py b/meson_post_install.py
index 9c80a73..2844696 100644
--- a/meson_post_install.py
+++ b/meson_post_install.py
@@ -6,10 +6,11 @@ import sys
 
 data_dir = sys.argv[1]
 
-icon_dir = os.path.join(data_dir, 'icons', 'hicolor')
-print('Update icon cache...')
-subprocess.call(['gtk-update-icon-cache', '-f', '-t', icon_dir])
+if not os.environ.get('DESTDIR'):
+    icon_dir = os.path.join(data_dir, 'icons', 'hicolor')
+    print('Update icon cache...')
+    subprocess.call(['gtk-update-icon-cache', '-f', '-t', icon_dir])
 
-schema_dir = os.path.join(data_dir, 'glib-2.0', 'schemas')
-print('Compiling gsettings schemas...')
-subprocess.call(['glib-compile-schemas', schema_dir])
+    schema_dir = os.path.join(data_dir, 'glib-2.0', 'schemas')
+    print('Compiling gsettings schemas...')
+    subprocess.call(['glib-compile-schemas', schema_dir])