depot/third_party/nixpkgs/pkgs/build-support/rust/sysroot/update-lockfile.sh

#!/usr/bin/env nix-shell
#!nix-shell -i bash -p python3 python3.pkgs.toml cargo

set -eu pipefile

HERE=$(readlink -e $(dirname "${BASH_SOURCE[0]}"))
NIXPKGS_ROOT="$HERE/../../../.."

# https://unix.stackexchange.com/a/84980/390173
tempdir=$(mktemp -d 2>/dev/null || mktemp -d -t 'update-lockfile')
cd "$tempdir"
mkdir -p src
touch src/lib.rs

RUSTC_SRC=$(nix-build "${NIXPKGS_ROOT}" -A pkgs.rustPlatform.rustLibSrc --no-out-link)

ln -s $RUSTC_SRC/{core,alloc} ./

export RUSTC_SRC
python3 "$HERE/cargo.py"

export RUSTC_BOOTSTRAP=1
cargo generate-lockfile

cp Cargo.lock "$HERE"

rm -rf "$tempdir"