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153 lines
6 KiB
Markdown
153 lines
6 KiB
Markdown
# Greetd
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This guide goes over how to setup `greetd`, which is a minimalistic Display
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Manager (DM) that starts right after boot and asks the user to log in.
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A DM is useful for letting you pick which session you wish to load after
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logging in (e.g. which WM/DE), but also to provide a slightly nicer UI in
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comparison to the default `agetty` TTY based login screen.
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Another neat feature that greetd offers is automatic login, which will allow
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you to skip the login process entirely, logging you in right after the boot.
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This can be useful if you're already typing in your LUKS encryption password
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each time after a boot, which already acts as a sufficient layer of protection
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against attackers trying to enter your system.
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<!-- markdownlint-disable MD028 -->
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> [!WARNING]
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> If you've set up TPM unlocking for your LUKS encryption, setting up automatic
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> login is not safe, unless you're using a TPM passphrase/PIN.
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> [!IMPORTANT]
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> If you're following while using my dotfiles, you will need to manually place
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> the greetd config from the repo into `/etc/greed/config.toml`. The
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> installation scripts don't do this, as many people prefer not using a
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> greeter.
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>
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> You will also need to follow the installation instructions to download greetd
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> and enable it.
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<!-- markdownlint-enable MD028 -->
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## Greetd + tuigreet
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Since I prefer a minimalistic approach to most things in my system, I like to
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use a terminal based greeter. Greetd itself is just a daemon that supports
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various greeters. Most of these greeters are graphical, but there are terminal
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based ones too, most notably `tuigreet`, which works right from the TTY.
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First, install and enable greetd, to make sure it gets started on boot.
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```bash
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sudo pacman -S greetd greetd-tuigreet
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sudo systemctl enable greetd
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```
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Now, we will want to define our greetd configuration in
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`/etc/greetd/config.toml`. There should already be a default configuraion that
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uses `agreety` greeter, which is similar to `agetty`, we'll want to change that
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to `tuigreet`, which in my opinion looks a lot better. We can use the following
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config:
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<!-- markdownlint-disable MD013 -->
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```toml
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[terminal]
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# The VT to run the greeter on. Can be "next", "current" or a number
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# designating the VT.
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vt = 1
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# The default session, also known as the greeter.
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[default_session]
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command = "tuigreet --time --remember --remember-user-session --asterisks --greeting 'Stop staring and log in already' --theme 'border=magenta;text=cyan;prompt=green;time=red;action=white;button=yellow;container=black;input=gray' --sessions /usr/share/wayland-sessions --xsessions /usr/share/xsessions --session-wrapper /usr/local/bin/greetd-session-wrapper --xsession-wrapper /usr/local/bin/greetd-session-wrapper startx /usr/bin/env"
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# The user to run the command as. The privileges this user must have depends
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# on the greeter. A graphical greeter may for example require the user to be
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# in the `video` group.
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user = "greeter"
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```
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<!-- markdownlint-enable MD013 -->
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> [!NOTE]
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> I know the `tuigreet` command is really hard to orient in when written in a
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> single line like this, however, attempting to use a multi-line string doesn't
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> seem to work with greetd (even though it is a part of the TOML standard).
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> This issue has already been
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> [reported](https://lists.sr.ht/~kennylevinsen/greetd/<trinity-082b25fc-e1fa-4772-950c-d458f065024a-1648717080362@3c-app-mailcom-bs08>),
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> yet it doesn't seem like it was addressed.
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You may have noticed that I've referred to a
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`/usr/local/bin/greetd-session-wrapper` script here, that's a custom script that
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I wrote to get greetd to run the command to start the WM/DE session within a
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running user shell (bash/zsh), so that the appropriate environment variables
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will be set when the WM is launched.
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This is the content of that script:
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```bash
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#!/bin/bash
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set -euo pipefail
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# This is a helper wrapper script for greetd.
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#
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# It will run the session / application using the appropriate shell configured for
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# this user. That way, we can make sure all of the environment variables are set
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# before the WM/DE session is started.
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#
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# This is very important, as without it, variables for things like qt theme
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# will not be set, and applications executed by the WM/DE will not be themed properly.
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script_name="$0"
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shell="$(getent passwd "$USER" | awk -F: '{print $NF}')"
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command=("$@")
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exec "$shell" -c 'exec "$@"' "$script_name" "${command[@]}"
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```
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With this configuration, you can now reboot and check whether greetd works
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properly. (You will still be asked for a password.)
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```bash
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reboot
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```
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If everything worked properly, you should've been presented with a custom
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tuigreet login screen after booting.
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> [!TIP]
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> Feel free to adjust the `tuigreet` settings to your liking by editing the
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> `command` in the greetd settings. If you need a reference for what settings
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> are available, you can check out the
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> [`tuigreet`](https://github.com/apognu/tuigreet) project page.
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## Configuring automatic Login
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To configure automatic login, we'll need to modify the `greetd` settings in
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`/etc/greetd/config.toml` and add an initial session section:
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```toml
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[terminal]
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# The VT to run the greeter on. Can be "next", "current" or a number
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# designating the VT.
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vt = 1
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# Auto-login session, triggered right after boot.
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# If the user logs out, greetd will render the default session
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[initial_session]
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user = "itsdrike" # TODO: CHANGE THIS
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command = "/usr/local/bin/greetd-session-wrapper Hyprland"
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# The default session, also known as the greeter.
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[default_session]
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command = "tuigreet --time --remember --remember-user-session --asterisks --greeting 'Stop staring and log in already' --theme 'border=magenta;text=cyan;prompt=green;time=red;action=white;button=yellow;container=black;input=gray' --sessions /usr/share/wayland-sessions --xsessions /usr/share/xsessions --session-wrapper /usr/local/bin/greetd-session-wrapper --xsession-wrapper /usr/local/bin/greetd-session-wrapper startx /usr/bin/env"
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# The user to run the command as. The privileges this user must have depends
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# on the greeter. A graphical greeter may for example require the user to be
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# in the `video` group.
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user = "greeter"
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```
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