add new file docs/mastodon_on_arch.md

docs/index.md

@@ -4,6 +4,7 @@ Obviously, the commit history will reflect the time when these documents are wri
 
 * [Serve And Share Apps From Your Phone With Fdroid](serve_and_share_apps_from_your_phone_with_fdroid.md)
 * [Nspawn Containers](nspawn.md)
+* [Mastodon on Arch](mastodon_on_arch.md)
 * [Debian Nspawn Container On Arch For Testing Apache Configurations](debian_nspawn_container_on_arch_for_testing_apache_configurations.md)
 * [Dynamic Cacheing Nginx Reverse Proxy For Pacman](dynamic_cacheing_nginx_reverse_proxy_for_pacman.md)
 * [Quick Dirty Redis Nspawn Container on Arch Linux](arch_redis_nspawn.md)

docs/mastodon_on_arch.md

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+# Some Observations About Installing Mastodon on Arch.
+
+## Nginx 
+
+From the [Production Guide](https://github.com/tootsuite/documentation/blob/master/Running-Mastodon/Production-guide.md)
+you can copy the example nginx.conf file to `/etc/nginx/sites-enabled/some_arbitrary.conf`,
+and then add the following to `/etc/nginx/nginx.conf` in the http section,
+this with a fresh install of nginx with the default configuration file.
+
+```bash 
+# /etc/nginx/nginx.conf 
+http {
+    include sites-enabled/*;
+}
+```
+
+## Installing the Dependancies
+
+```bash
+pacman -S certbot nginx libxml2 imagemagick ffmpeg git yarn npm python2 oidentd
+```
+
+```bash
+# I'm guessing here
+pacman -S libpqxx libxslt protobuf protobuf-c
+```
+
+* I'm assuming base-devel is installed
+* python2 seems to be required to run `yarn install` command later on
+* oidentd seems to be a usable replacement for pident
+* libpqxx pulls in postgresql-libs
+* file is already installed
+* curl is already installed
+* ruby-build and rbenv are installable from aur
+* also postgresql and redis unless, those are in another container or whatever.
+
+## Other Observations
+
+I discovered that between `gem install bundler` and  
+`bundle install --deployment --without development test`,
+you have to update your environment, with 
+`eval "$(rbenv init -)"`, i.e.
+
+```bash 
+echo 'eval "$(rbenv init -)"' >> .bashrc
+# and then
+. ~/.bashrc
+```
+
+You have to update your environment more than once, during the
+installation.
+
+Presumably you don't ever want to delete the `~/live/Public/` directory
+if that is where assets are being stored, but it seems ok to delete 
+`~/live/node_modules` and then rerun the `yarn install` command.
+
+In `~/live/.env.production`, `SINGLE_USER_MODE=false` has to be set
+to `false` until at least one user is created, or the web service won't 
+even start.  (Also `chmod 755 ~/`)