82 lines
2.6 KiB
Bash
Executable File
82 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Download the latest NixOS installer ISO into iso/.
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#
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# Saves the ISO under its real upstream snapshot name (e.g.
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# nixos-graphical-25.11.10684.8fd9daa3db09-x86_64-linux.iso) so different
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# channel heads don't clobber each other. Maintains a stable
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# `latest-nixos-<edition>-<arch>.iso` symlink in iso/ pointing at the newest.
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set -euo pipefail
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CHANNEL="nixos-26.05"
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EDITION="graphical"
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ARCH="x86_64-linux"
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DEST_DIR="iso"
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while (($#)); do
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case "$1" in
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--channel) CHANNEL="${2:?missing value}"; shift 2 ;;
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--edition) EDITION="${2:?missing value}"; shift 2 ;;
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--arch) ARCH="${2:?missing value}"; shift 2 ;;
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--dest) DEST_DIR="${2:?missing value}"; shift 2 ;;
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-h|--help)
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awk '/^#!/ {next} /^[^#]/ {exit} {sub(/^# ?/, ""); print}' "$0"
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exit 0 ;;
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*) echo "[-] unknown arg: $1" >&2; exit 1 ;;
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esac
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done
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BASE="https://channels.nixos.org/${CHANNEL}"
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LATEST_NAME="latest-nixos-${EDITION}-${ARCH}.iso"
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mkdir -p "$DEST_DIR"
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# Fetch the small sha256 file first. Its format is `<hash> <real-filename>`
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# so we can derive the actual snapshot filename from it.
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echo "[+] Fetching ${BASE}/${LATEST_NAME}.sha256"
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tmp_sum="$(mktemp)"
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trap 'rm -f "$tmp_sum"' EXIT
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curl --fail --location --silent --show-error --output "$tmp_sum" \
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"${BASE}/${LATEST_NAME}.sha256" \
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|| { echo "[-] sha256 fetch failed" >&2; exit 2; }
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real_name="$(awk '{print $2}' "$tmp_sum")"
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if [[ -z "$real_name" || "$real_name" != *.iso ]]; then
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echo "[-] couldn't parse filename from upstream sha256:" >&2
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cat "$tmp_sum" >&2
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exit 2
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fi
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iso="${DEST_DIR}/${real_name}"
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sum="${DEST_DIR}/${real_name}.sha256"
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if [[ -f "$iso" && -f "$sum" ]]; then
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if ( cd "$DEST_DIR" && sha256sum --status -c "${real_name}.sha256" ); then
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echo "[+] ${iso} already present and verified."
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ln -sfn "${real_name}" "${DEST_DIR}/${LATEST_NAME}"
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exit 0
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fi
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echo "[!] ${iso} present but sha256 mismatch — re-downloading from scratch."
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# curl --continue-at would resume from the corrupt bytes; nuke first.
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rm -f "$iso"
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fi
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mv "$tmp_sum" "$sum"
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trap - EXIT
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echo "[+] Downloading ${BASE}/${LATEST_NAME}"
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echo " -> ${iso}"
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curl --fail --location --progress-bar --continue-at - \
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--output "$iso" "${BASE}/${LATEST_NAME}" \
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|| { echo "[-] download failed" >&2; exit 2; }
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echo "[+] Verifying sha256..."
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( cd "$DEST_DIR" && sha256sum -c "${real_name}.sha256" ) \
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|| { echo "[-] sha256 verification failed" >&2; exit 3; }
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ln -sfn "${real_name}" "${DEST_DIR}/${LATEST_NAME}"
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echo "[+] ${iso}"
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echo "[+] symlink: ${DEST_DIR}/${LATEST_NAME} -> ${real_name}"
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