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@@ -0,0 +1,78 @@
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+#!/bin/bash
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+
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+set -eu -o pipefail
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+
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+declare -a urls
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+
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+usage() {
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+ echo "Usage: download --url https://example.org/test --url https://mirror.example/blah --output test.tar --sha256 1234..abc"
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+ exit "${1:-0}"
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+}
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+
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+while [ $# -gt 0 ]; do
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+ case "$1" in
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+ --url)
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+ urls+=("$2")
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+ shift
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+ ;;
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+ --output)
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+ output="$2"
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+ shift
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+ ;;
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+ --sha256)
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+ sha256="$2"
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+ shift
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+ ;;
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+ --help|-h)
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+ usage
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+ ;;
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+ *)
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+ usage 1
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+ ;;
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+ esac
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+ shift
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+done
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+
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+if [ -z "${output:-}" ] || [ -z "${sha256:-}" ] || [ -z "${urls[*]}" ]; then
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+ usage 1
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+fi
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+
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+if [ -n "${DL_CACHE:-}" ]; then
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+ if [ -f "$DL_CACHE/$sha256" ]; then
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+ echo "download: Found '$output' (${sha256:0:8}...) in cache."
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+ cp "$DL_CACHE/$sha256" "$output"
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+ exit 0
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+ fi
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+fi
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+
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+if [ "${DL_OFFLINE:-}" == "true" ]; then
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+ echo "download: ERROR: File '$output' (${sha256:0:8}...) not found in cache and offline mode is active!"
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+ exit 1
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+fi
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+
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+tmpd="$(mktemp -d -p "${DL_CACHE:-.}")"
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+cleanup() {
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+ rm -rf "$tmpd"
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+}
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+trap cleanup EXIT
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+
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+for url in "${urls[@]}"; do
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+ echo "download: Trying to fetch $url"
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+ wget --timeout=10 -O "$tmpd/unverified" "$url" || true
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+ sha256_received="$(sha256sum "$tmpd/unverified" | cut -d ' ' -f 1)"
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+ if [ "$sha256" != "$sha256_received" ]; then
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+ echo "download: WARNING: Hash mismatch: Expected $sha256 but received $sha256_received"
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+ continue
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+ fi
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+ echo "download: Fetched '$output' (${sha256:0:8}...) successfully."
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+ if [ -n "${DL_CACHE:-}" ]; then
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+ mv "$tmpd/unverified" "$DL_CACHE/$sha256"
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+ cp "$DL_CACHE/$sha256" "$output"
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+ exit 0
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+ fi
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+ mv "$tmpd/unverified" "$output"
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+ exit 0
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+done
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+
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+echo "download: ERROR: Failed to download '$output' (${sha256:0:8}...)! No URLs left to try."
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+exit 1
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Simon Gaiser