Add capabilities at build

slop-apt

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+helper_dir=${SLOPTRAP_HELPER_DIR:-/run/sloptrap-helper}
+queue_dir="$helper_dir/queue"
+mkdir -p "$queue_dir"
+
+if [[ ${1-} != "install" ]]; then
+  printf 'usage: slop-apt install <package...>\n' >&2
+  exit 2
+fi
+shift
+
+if [[ $# -eq 0 ]]; then
+  printf 'slop-apt: at least one package is required\n' >&2
+  exit 2
+fi
+
+for package in "$@"; do
+  if [[ ! $package =~ ^[A-Za-z0-9+.-]+$ ]]; then
+    printf 'slop-apt: invalid package name %s\n' "$package" >&2
+    exit 2
+  fi
+done
+
+request_dir=$(mktemp -d "$queue_dir/request.XXXXXX.req")
+trap 'rm -rf "$request_dir"' EXIT INT TERM HUP
+printf 'apt-install\n' >"$request_dir/op"
+printf '%s\n' "$@" >"$request_dir/packages"
+
+while [[ ! -f "$request_dir/status" ]]; do
+  sleep 1
+done
+
+if [[ -s "$request_dir/stdout" ]]; then
+  cat "$request_dir/stdout"
+fi
+if [[ -s "$request_dir/stderr" ]]; then
+  cat "$request_dir/stderr" >&2
+fi
+
+status=$(<"$request_dir/status")
+exit "$status"