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nixpkgs/pkgs/development/tools/diesel-cli/update-cargo-lock.sh

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#!/bin/sh
# This updates cargo-lock.patch for the diesel version listed in default.nix.
set -eu -o verbose
here=$PWD
version=$(cat default.nix | grep '^ version = "' | cut -d '"' -f 2)
checkout=$(mktemp -d)
git clone -b "v$version" --depth=1 https://github.com/diesel-rs/diesel "$checkout"
cd "$checkout"
rm -f rust-toolchain
cargo generate-lockfile
git add -f Cargo.lock
git diff HEAD -- Cargo.lock > "$here"/cargo-lock.patch
cd "$here"
rm -rf "$checkout"