Unset LD_LIBRARY_PATH when calling system tools from AppImage

src/core/HostShell.lua

@@ -0,0 +1,23 @@
+-- Helpers for calling host tools (curl, zenity/kdialog, ...).
+
+local HostShell = {}
+
+-- Our AppRun exports LD_LIBRARY_PATH="$APPDIR/lib:..." so every subprocess we
+-- spawn tries to link against the libraries we're shipping instead of the
+-- system ones. We want to unset the var so that any system tools can find
+-- their proper libraries. Only needed when running in an AppImage.
+function HostShell.envPrefix()
+  if os.getenv("APPIMAGE") then
+    return "env -u LD_LIBRARY_PATH "
+  end
+  return ""
+end
+
+-- Wraps io.popen with the AppImage env fix applied and lua errors swallowed
+function HostShell.popen(command, mode)
+  local ok, pipe = pcall(io.popen, HostShell.envPrefix() .. command, mode or "r")
+  if not ok or not pipe then return nil end
+  return pipe
+end
+
+return HostShell