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#!/usr/bin/env nix-shell
#!nix-shell -i bash -p jq
set -o pipefail -o errexit -o nounset
trace() { echo >&2 "$@"; }
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
channel=nixos-unstable
pin_file=$SCRIPT_DIR/pinned-tool.json
trace -n "Fetching latest version of channel $channel.. "
# This is probably the easiest way to get Nix to output the path to a downloaded channel!
nixpkgs=$(nix-instantiate --find-file nixpkgs -I nixpkgs=channel:"$channel")
trace "$nixpkgs"
# This file only exists in channels
rev=$(<"$nixpkgs/.git-revision")
trace -e "Git revision of channel $channel is \e[34m$rev\e[0m"
trace -n "Fetching the prebuilt version of nixpkgs-check-by-name.. "
path=$(nix-build --no-out-link "$nixpkgs" -A tests.nixpkgs-check-by-name -j 0 | tee /dev/stderr)
trace "Updating $pin_file"
jq -n \
--arg rev "$rev" \
--arg path "$path" \
'$ARGS.named' \
> "$pin_file"
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