Install with the bash script from the opencode website:

curl -fsSL https://opencode.ai/install | bash

reload your shell (or login again) exec zsh

verify with:

opencode --version

The install script from the opencode repository has a fixed location for the binary located in the users homedirectory together with the user settings. changing this would involve ajusting the script at:

...

INSTALL_DIR=$HOME/.opencode/bin
mkdir -p "$INSTALL_DIR"

...

sudo vi /etc/systemd/system/opencode.service
add:

[Unit]
Description=OpenCode AI Assistant
After=network.target

[Service]
Type=simple
User=abel
ProtectHome=false
WorkingDirectory=/home/abel/opencode/projects
ExecStart=/home/abel/.opencode/bin/opencode web --port 4096 --hostname 0.0.0.0
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

User=abel seems unsafe but that is how it works, and seeing as it is on the personal workstation any sequrity risk is minimal.

Start and enable opencode by:

sudo systemctl enable opencode --now

This systemd unit started a web interface on http://localhost:4096/

there is also a VSCodium plugin. how to set this up you can find here.