Comment # 24 on bug 1177395 from Chris Schaller

Wait a moment.  Shouldn't GNOME_SOFTWARE_PLUGINS_BLOCKLIST=fwupd disable fwupd?

gnome-software still lists the plugin as enabled:

chris@linux:~/gs-issues> pkill gnome-software;
GNOME_SOFTWARE_PLUGINS_BLOCKLIST=fwupd gnome-software
17:00:26:0724 Gs  enabled plugins: desktop-categories, fwupd, os-release,
packagekit, packagekit-local, packagekit-offline, packagekit-proxy,
packagekit-refine-repos, packagekit-refresh, packagekit-upgrade,
packagekit-url-to-app, shell-extensions, appstream, desktop-menu-path, flatpak,
hardcoded-blacklist, hardcoded-featured, hardcoded-popular, modalias,
packagekit-refine, rewrite-resource, odrs, packagekit-history, provenance,
systemd-updates, generic-updates, provenance-license, icons, key-colors,
key-colors-metadata
17:00:26:0724 Gs  disabled plugins: dpkg, dummy, fedora-pkgdb-collections,
fedora_langpacks, repos, epiphany

fwupd also shows up in my logs.