sandbox: Fix MIME-type detection inside the sandbox

It turns out that MIME-type detection depends on various files in
$XDG_DATA_HOME/mime, at least on my Fedora 24 system.

We need to link to these files in our overridden XDG_DATA_HOME dir if we
want extraction to work properly, otherwise everything is detected as
text/plain.

1 files changed, 20 insertions, 0 deletions

diff --git a/utils/sandbox/tracker-sandbox.py b/utils/sandbox/tracker-sandbox.py
index 42d0e333a..abfb05be8 100755
--- a/utils/sandbox/tracker-sandbox.py
+++ b/utils/sandbox/tracker-sandbox.py
@@ -78,6 +78,8 @@ dbus_session_file = ''
 store_pid = -1
 store_proc = None
 
+original_xdg_data_home = GLib.get_user_data_dir()
+
 # Template config file
 config_template = """
 [General]
@@ -399,6 +401,22 @@ def config_set():
 		config.write(f)
 
 
+def link_to_mime_data():
+	'''Create symlink to $XDG_DATA_HOME/mime in our custom data home dir.
+
+	Mimetype detection seems to break horribly if the $XDG_DATA_HOME/mime
+	directory is missing. Since we have to override the normal XDG_DATA_HOME
+	path, we need to work around this by linking back to the real mime data.
+
+	'''
+	new_xdg_data_home = os.environ['XDG_DATA_HOME']
+	new_mime_dir = os.path.join(new_xdg_data_home, 'mime')
+	if not os.path.exists(new_mime_dir):
+		mkdir_p(new_xdg_data_home)
+		os.symlink(
+			os.path.join(original_xdg_data_home, 'mime'), new_mime_dir)
+
+
 # Entry point/start
 if __name__ == "__main__":
 	locale.setlocale(locale.LC_ALL, '')
@@ -493,6 +511,8 @@ if __name__ == "__main__":
 	environment_set()
 	config_set()
 
+	link_to_mime_data()
+
 	try:
 		if opts.update:
 			index_update()