Vervis is still in early development. These instructions may be incomplete
and/or slightly outdated. At the time of writing, you can get a running Vervis
instance if you follow the steps below.

Check the version of OpenSSL installed on your system. For example:

    $ apt show openssl

Currently Vervis is using a slightly old software configuration, and until I
fix that, it doesn't build with OpenSSL 1.1 and needs the older 1.0 or 1.0.1
version. If your distro has 1.1, see if you can grab 1.0 or 1.0.1 in some way,
either through the distro package or by downloading OpenSSL manually from its
website, or some alternative package manager such as GNU Guix.

Install dependency library development packages. It's very likely you already
have them all installed, and if you're missing some, the build process will
inform you. But it's still nice to have a list here. The list below isn't a
complete list, it's just libraries that people have found missing while
building, and let me know.

- PostgreSQL client library
- ZLib

On Debian based distros, installation can be done like this:

    $ sudo apt install libpq-dev zlib1g-dev

Install stack. To install stack, go to its [website](https://haskellstack.org)
and follow the instructions.  If you have some old version, such as one
installed from FPComplete's old debian repo, you may need to upgrade it.

Install Darcs. You can grab it from your distro, e.g.:

    $ sudo apt install darcs

If you're going to create a Git repository on Vervis, you'll need Git too, you
can install it from a distro package too, e.g.:

    $ sudo apt install git

Clone the Vervis repo:

    $ darcs clone https://dev.seek-together.space/s/fr33domlover/r/vervis
    $ cd vervis

Install GHC. Unless you prefer to use a distro package or PPA or some other
source, the easiest way is to install via stack:

    $ stack setup

Check in `stack.yaml` near the top which extra repos are required. At the time
of writing, there are 4 of them (`hit-harder`, `hit-graph`, `hit-network` and
`ssh`). Then clone them. For example:

    $ darcs clone https://dev.seek-together.space/s/fr33domlover/r/ssh

Those extra repos should be found at the
[Vervis project page](https://dev.seek-together.space/s/fr33domlover/p/vervis).
If something is missing there, try my
[Darcs Hub page](https://hub.darcs.net/fr33domlover). I'm sorry I'm not just
listing the URLs here. These things have been changing often, but once they
stabilize I will update the docs, and also make releases of all these extra
libraries.

Update `stack.yaml` to specify that path in the `packages` section if needed:

    $ vim stack.yml

Generate a new SSH key with a blank password:

    $ ssh-keygen -t rsa -f config/ssh-host-key

Install PostgreSQL. You'll need the server and the client library development
files.

    $ sudo apt-get install postgresql libpq-dev

Switch to `postgres` system user:

    $ sudo su - postgres

Create a PostgreSQL user.

With password:

    $ createuser --no-createdb --no-createrole --no-superuser --encrypted --pwprompt vervis

No password (if you run Vervis as a user by the same name as the DB user):

    $ createuser --no-createdb --no-createrole --no-superuser vervis

Create a PostgreSQL database:

    $ createdb --encoding=UTF8 --owner=vervis vervis

Update the settings to specify correct database connection details and other
settings.

    $ cp config/settings-default.yaml config/settings.yml
    $ vim config/settings.yml

Build.

    $ stack build

Run.

    $ stack exec vervis

Browse to `http://localhost:3000` and have fun!

`yesod devel` is another way to run the application, useful for rapid
development, but I haven't been using it and I'm not sure it works, possibly I
broke something along the way. But feel free to try!