#!/usr/bin/env bash
set -euo pipefail

# The local distribution gate pulls the 7 GB Ollama image, downloads the default embedding
# model, builds the application images, and then archives every durable volume. GitHub's hosted
# Linux image also ships toolchains this job never uses. Remove only those known, runner-owned
# installations so the backup is tested with the production semantic stack instead of a stub.
[[ "$(uname -s)" == Linux ]] || {
  printf 'Linux is required for hosted-runner disk preparation.\n' >&2
  exit 1
}

readonly unused_toolchains=(
  /usr/local/lib/android
  /usr/share/dotnet
  /opt/ghc
  /usr/local/.ghcup
)

for path in "${unused_toolchains[@]}"; do
  [[ -e "$path" || -L "$path" ]] || continue
  sudo rm -rf -- "$path"
done

sudo apt-get clean
docker system prune --all --force
df -h /
docker system df