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dotfiles/docker/install.sh
T
noconnorandClaude Opus 4.8 3751836c5c docker/: install rootful Docker; gate kind on it
kind never worked reliably against rootless Docker on Kasm, even with the
cgroup delegation from docker-rootless-cgroup/. So install full Docker
where we can, and flip bin/'s kind gate from "rootless is available" to
"a rootful daemon answers" — kind is simply skipped on Kasm now.

docker/install.sh no-ops when a rootless daemon is already running so it
never fights Kasm's setup. It runs before bin/ in bootstrap so the kind
gate can see the daemon it just started. zsh/zshrc re-execs via newgrp
when the account gained the docker group but the live shell predates it.

docker-rootless-cgroup/ keeps its delegation (still useful for
per-container resource limits); only its kind-centric comments change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-12 04:39:58 -04:00

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#!/usr/bin/env sh
# docker/install.sh — install full (rootful) Docker Engine and let the
# invoking user talk to it without sudo.
#
# What it does:
# 1. Installs Docker Engine via Docker's official convenience script
# (get.docker.com — supports both RHEL- and Debian-family distros and
# sets up the upstream package repo). Skipped when `docker` is already
# installed.
# 2. Enables and starts the service (systemd hosts only).
# 3. Adds the invoking user to the `docker` group so the daemon socket is
# usable without sudo. Takes effect at next login.
#
# Deliberately no-ops when a rootless Docker daemon is detected (e.g. Kasm
# ships its own rootless setup) — installing rootful Docker there would fight
# the existing runtime. See docker-rootless-cgroup/ for the Kasm-side config.
#
# Idempotent and safe to re-run. Uses sudo.
set -eu
say() { printf '%s\n' "$*" >&2; }
# --- skip on rootless-Docker hosts -------------------------------------------
if command -v docker >/dev/null 2>&1 &&
docker info -f '{{println .SecurityOptions}}' 2>/dev/null | grep -q 'name=rootless'; then
say "docker: rootless Docker daemon detected; leaving it alone."
exit 0
fi
# --- 1. install engine -------------------------------------------------------
if command -v docker >/dev/null 2>&1; then
say "docker: engine already installed ($(docker --version 2>/dev/null || echo 'version unknown'))."
else
say "docker: installing Docker Engine via get.docker.com..."
tmp="$(mktemp)"
if command -v curl >/dev/null 2>&1; then
curl -fsSL https://get.docker.com -o "$tmp"
elif command -v wget >/dev/null 2>&1; then
wget -qO "$tmp" https://get.docker.com
else
say "docker: need curl or wget"; exit 1
fi
sudo sh "$tmp"
rm -f "$tmp"
fi
# --- 2. enable + start the service (systemd only) ----------------------------
if [ -d /run/systemd/system ] && command -v systemctl >/dev/null 2>&1; then
sudo systemctl enable --now docker
else
say "docker: no systemd; not managing the service (start dockerd yourself)."
fi
# --- 3. group membership for the invoking user -------------------------------
user="$(id -un)"
if id -nG "$user" | tr ' ' '\n' | grep -qx docker; then
say "docker: $user already in the docker group."
else
sudo usermod -aG docker "$user"
say "docker: added $user to the docker group."
say " Log out and back in (or run 'newgrp docker') for it to take effect."
fi