#!/bin/sh

# Start from the build image's prebuilt dependencies, then run the command.

# OxygenFlow's rust image holds this workspace's dependencies built at /src with

# this pipeline's environment (oxygenflow/images/rust, backlog F6b2); the

# job's target disk starts empty, so copying them in leaves cargo only this

# workspace's own crates to compile. Without them (an older image, or a

# failed copy) the job simply builds everything, as before.

set -eu

warm=/opt/warm/oxygen

# A fresh ext4 target disk holds only lost+found.

if [ -d "$warm" ] && [ -z "$(ls -A target 2>/dev/null | grep -vx 'lost+found')" ]; then

    start=$(date +%s)

    if cp -R --preserve=timestamps "$warm/." target/; then

        echo "flow: prebuilt dependencies copied in $(( $(date +%s) - start )) s"

    else

        echo "flow: could not copy the prebuilt dependencies; building them" >&2

        rm -rf target/* 2>/dev/null || true

    fi

fi

exec "$@"