From ac4ede20afcd89283618d1f764b463b314c4c9ab Mon Sep 17 00:00:00 2001
From: Aaron Raimist <aaron@raim.ist>
Date: Fri, 21 May 2021 04:43:04 -0500
Subject: [PATCH] Add docs

---
 README.md                                     |  2 ++
 docs/configuring-dns.md                       |  3 +++
 docs/configuring-playbook-client-hydrogen.md  | 21 +++++++++++++++++++
 .../tasks/validate_config.yml                 |  2 +-
 4 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 docs/configuring-playbook-client-hydrogen.md

diff --git a/README.md b/README.md
index beb938b4d..8448680cf 100644
--- a/README.md
+++ b/README.md
@@ -105,6 +105,8 @@ Using this playbook, you can get the following services configured on your serve
 
 - (optional) the [Sygnal](https://github.com/matrix-org/sygnal) push gateway - see [Setting up the Sygnal push gateway](docs/configuring-playbook-sygnal.md) for setup documentation
 
+- (optional) the [Hydrogen](https://github.com/vector-im/hydrogen-web) web client - see [docs/configuring-playbook-client-hydrogen.md](docs/configuring-playbook-client-hydrogen.md) for setup documentation
+
 Basically, this playbook aims to get you up-and-running with all the necessities around Matrix, without you having to do anything else.
 
 **Note**: the list above is exhaustive. It includes optional or even some advanced components that you will most likely not need.
diff --git a/docs/configuring-dns.md b/docs/configuring-dns.md
index 285ded424..adff4e285 100644
--- a/docs/configuring-dns.md
+++ b/docs/configuring-dns.md
@@ -36,6 +36,7 @@ If you are using Cloudflare DNS, make sure to disable the proxy and set all reco
 | CNAME | `stats` (*)                  | -        | -      | -    | `matrix.<your-domain>` |
 | CNAME | `goneb` (*)                  | -        | -      | -    | `matrix.<your-domain>` |
 | CNAME | `sygnal` (*)                 | -        | -      | -    | `matrix.<your-domain>` |
+| CNAME | `hydrogen` (*)               | -        | -      | -    | `matrix.<your-domain>` |
 
 ## Subdomains setup
 
@@ -54,6 +55,8 @@ The `goneb.<your-domain>` subdomain may be necessary, because this playbook coul
 
 The `sygnal.<your-domain>` subdomain may be necessary, because this playbook could install the [Sygnal](https://github.com/matrix-org/sygnal) push gateway. The installation of Sygnal is disabled by default, it is not a core required component. To learn how to install it, see our [configuring Sygnal guide](configuring-playbook-sygnal.md). If you do not wish to set up Sygnal (you probably don't, unless you're also developing/building your own Matrix apps), feel free to skip the `sygnal.<your-domain>` DNS record.
 
+The `hydrogen.<your-domain>` subdomain may be necessary, because this playbook could install the [Hydrogen](https://github.com/vector-im/hydrogen-web) web client. The installation of Hydrogen is disabled by default, it is not a core required component. To learn how to install it, see our [configuring Hydrogen guide](configuring-playbook-client-hydrogen.md). If you do not wish to set up Hydrogen, feel free to skip the `sygnal.<your-domain>` DNS record.
+
 
 ## `_matrix-identity._tcp` SRV record setup
 
diff --git a/docs/configuring-playbook-client-hydrogen.md b/docs/configuring-playbook-client-hydrogen.md
new file mode 100644
index 000000000..fda5aec37
--- /dev/null
+++ b/docs/configuring-playbook-client-hydrogen.md
@@ -0,0 +1,21 @@
+# Configuring Hydrogen (optional)
+
+This playbook can install the [Hydrogen](https://github.com/vector-im/hydrogen-web) Matrix web client for you.
+Hydrogen is a lightweight web client that supports mobile and legacy web browsers.
+Hydrogen can be installed alongside or instead of Element.
+
+If you'd like Hydrogen to be installed, add the following to your configuration file (`inventory/host_vars/matrix.<your-domain>/vars.yml`):
+
+```yaml
+matrix_client_hydrogen_enabled: true
+```
+
+You will also need to add a DNS record so that Hydrogen can be accessed. 
+By default Hydrogen will use https://hydrogen.DOMAIN so you will need to create an CNAME record
+for `hydrogen`. See [docs/configuring-dns.md](docs/configuring-dns.md).
+
+If you would like to use a different domain, add the following to your configuration file (changing it to use your preferred domain):
+
+```yaml
+ matrix_server_fqn_hydrogen: "helium.{{ matrix_domain }}"
+```
diff --git a/roles/matrix-client-hydrogen/tasks/validate_config.yml b/roles/matrix-client-hydrogen/tasks/validate_config.yml
index 6d4b7d21b..d3b9a709b 100644
--- a/roles/matrix-client-hydrogen/tasks/validate_config.yml
+++ b/roles/matrix-client-hydrogen/tasks/validate_config.yml
@@ -4,6 +4,6 @@
   fail:
     msg: >
       You need to define a required configuration setting (`{{ item }}`) to use Hydrogen.
-  when: "vars[item] == '' or vars[item] is none"
+  when: "(vars[item] == '' or vars[item] is none) and matrix_client_hydrogen_container_image_self_build|bool"
   with_items:
     - "matrix_client_hydrogen_default_hs_url"