138 lines
3.2 KiB
Plaintext
138 lines
3.2 KiB
Plaintext
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#!/bin/sh
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set -eu
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name="fetchpijul"
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remote=
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channel="main"
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change=
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state=
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exp_hash=
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usage() {
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echo "Usage: nix-prefetch-pijul [options] [REMOTE] [STATE [EXPECTED-HASH]]"
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echo
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echo "Options:"
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echo " --name <NAME> Symbolic store path name to use for the result."
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echo " --remote <REMOTE> URL for the Pijul repository."
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echo " --change <CHANGE> Clone a specific change."
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echo " --state <STATE> Clone a specific state."
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echo " --channel <CHANNEL> Channel name (default: ‘main’)."
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echo " --hash <HASH> Expected hash."
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echo " --help Show this help message."
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}
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# Argument parsing
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while [ $# -gt 0 ]; do
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case "$1" in
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--name)
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name="$2"; shift 2 ;;
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--remote)
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remote="$2"; shift 2 ;;
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--channel)
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channel="$2"; shift 2 ;;
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--change)
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change="$2"; shift 2 ;;
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--state)
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state="$2"; shift 2 ;;
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--hash)
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exp_hash="$2"; shift 2 ;;
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--help)
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usage; exit 0 ;;
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*)
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# Positional arguments
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if [ -z "$remote" ]; then
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remote="$1"
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shift
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elif [ -z "$state" ]; then
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state="$1"
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shift
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elif [ -z "$exp_hash" ]; then
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exp_hash="$1"
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shift
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else
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echo "Error: Too many arguments" >&2
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usage
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exit 1
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fi
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;;
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esac
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done
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if [ -z "$remote" ]; then
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echo "Error: URL for remote is required." >&2
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echo >&2
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usage
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exit 1
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elif [ -n "$change" -a -n "$state" ]; then
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echo "Error: Only one of ‘change’ or ‘state’ can be set" >&2
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echo >&2
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usage
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exit 1
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fi
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hash=
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hash_algo="${NIX_HASH_ALGO:-"sha256"}"
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hash_format="${hashFormat:-"--base32"}"
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final_path=
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# If the hash was given, a file with that hash may already be in the
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# store.
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if [ -n "$exp_hash" ]; then
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final_path=$(nix-store --print-fixed-path --recursive "$hash_algo" "$exp_hash" "$name")
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if ! nix-store --check-validity "$final_path" 2> /dev/null; then
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final_path=""
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fi
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hash="$exp_hash"
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fi
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# If we don’t know the hash or a path with that hash doesn’t exist,
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# download the file and add it to the store.
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if [ -z "$final_path" ]; then
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tmp_clone="$(realpath "$(mktemp -d --tmpdir pijul-clone-tmp-XXXXXXXX)")"
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trap "rm -rf \"$tmp_clone\"" EXIT
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clone_args="--channel $channel"
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if [ -n "$change" ]; then
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clone_args="$clone_args --change $change"
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elif [ -n "$state" ]; then
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clone_args="$clone_args --state $state"
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fi
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cd "$tmp_clone"
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pijul clone $clone_args "$remote" "$name"
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rm -rf "$tmp_clone/$name/.pijul"
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hash="$(nix-hash --type "$hash_algo" "$hash_format" "$tmp_clone/$name")"
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final_path=$(nix-store --add-fixed --recursive "$hash_algo" "$tmp_clone/$name")
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if [ -n "$exp_hash" -a "$exp_hash" != "$hash" ]; then
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echo "Hash mismatch for “$remote” @ “$channel”" >&2
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echo "Expected: $exp_hash" >&2
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echo "Got: $hash" >&2
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exit 1
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fi
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fi
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json_escape() {
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printf '%s' "$1" | jq -Rs .
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}
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cat <<EOF
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{
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"remote": $(json_escape "$remote"),
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"channel": $(json_escape "$channel"),
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EOF
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if [ -n "$change" ]; then cat <<EOF
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"change": "$(json_escape "$change")",
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EOF
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elif [ -n "$state" ]; then cat <<EOF
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"state": "$(json_escape "$state")",
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EOF
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fi; cat <<EOF
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"path": "$final_path",
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$(json_escape "$hash_algo"): $(json_escape "$hash"),
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"hash": "$(nix-hash --to-sri --type "$hash_algo" "$hash")"
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}
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EOF
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# vim: noet ci pi sts=0
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