doc: uninstall cacher client based on tag

For: #41

salt/sys-cacher/README.md

@@ -54,7 +54,7 @@ sudo qubesctl --skip-dom0 --targets=tpl-sys-cacher state.apply sys-cacher.instal
 sudo qubesctl --skip-dom0 --targets=sys-cacher state.apply sys-cacher.configure
 sudo qubesctl --skip-dom0 --targets=sys-cacher-browser state.apply sys-cacher.configure-browser
 sudo qubesctl state.apply sys-cacher.appmenus,sys-cacher.tag
-sudo qubesctl --skip-dom0 --templates state.apply sys-cacher.install-client
+sudo qubesctl --skip-dom0 --targets="$(qvm-ls --no-spinner --raw-list --tags updatevm-sys-cacher | tr "\n" ",")" state.apply sys-cacher.install-client
 ```
 <!-- pkg:end:post-install -->
 
@@ -99,19 +99,22 @@ By default, only templates will use the proxy to update, if you want to cache
 Non-TemplateVMs updates or simply make them functional again, the qube will
 need the `service.updates-proxy-setup` feature set:
 ```sh
-sudo qubesctl --skip-dom0 --targets=QUBE state.apply sys-cacher.install-client
 qvm-tags add QUBE updatevm-sys-cacher
 qvm-features QUBE service.updates-proxy-setup 1
+sudo qubesctl --skip-dom0 --targets=QUBE state.apply sys-cacher.install-client
 ```
 Don't forget to restart the qube.
 
 If you don't want or can't restart the qube, such as DispVMs, where you would
-lose the current session, run the above commands plus the following inside the
-qube:
+lose the current session:
 ```sh
-sudo touch /var/run/qubes-service/updates-proxy-setup
-sudo /usr/lib/qubes/update-proxy-configs
-sudo systemctl restart qubes-updates-proxy-forwarder.socket
+qvm-tags add QUBE updatevm-sys-cacher
+qvm-features QUBE service.updates-proxy-setup 1
+qvm-run --user=root QUBE -- "
+  touch /var/run/qubes-service/updates-proxy-setup
+  /usr/lib/qubes/update-proxy-configs
+  systemctl restart qubes-updates-proxy-forwarder.socket"
+sudo qubesctl --skip-dom0 --targets=QUBE state.apply sys-cacher.install-client
 ```
 
 ### Rewrite URIs inside the qube
@@ -131,21 +134,22 @@ sudo apt-cacher-ng-repo uninstal
 - Top:
 ```sh
 sudo qubesctl top.enable sys-cacher.deinit
-sudo qubesctl --templates state.apply
+sudo qubesctl --targets="$(qvm-ls --no-spinner --raw-list --tags updatevm-sys-cacher | tr "\n" ",")" state.apply
 sudo qubesctl top.disable sys-cacher.deinit
 ```
 
 - State:
 ```sh
 sudo qubesctl state.apply sys-cacher.remove-policy
+sudo qubesctl --skip-dom0 --targets="$(qvm-ls --no-spinner --raw-list --tags updatevm-sys-cacher | tr "\n" ",")" state.apply sys-cacher.uninstall-client
 sudo qubesctl state.apply sys-cacher.untag
-sudo qubesctl --skip-dom0 --templates state.apply sys-cacher.uninstall-client
 ```
 
-If you want to use the standard proxy for a few templates:
+If you want to use the standard proxy for a few qubes, only uninstall it
+from the templates that you don't want to cache packages:
 ```sh
-sudo qubesctl --skip-dom0 --targets=TEMPLATE state.apply sys-cacher.uninstall-client
-qvm-tags del TEMPLATE updatevm-sys-cacher
+sudo qubesctl --skip-dom0 --targets=QUBE state.apply sys-cacher.uninstall-client
+qvm-tags del QUBE updatevm-sys-cacher
 ```
 
 ## Credits