dargo

#!/bin/sh

if [ $# -eq 0 ]; then
        echo "usage: $0 [cargo options]" >&2
        exit 64
fi

if [ ! -r Cargo.lock ]; then
        echo "Not a cargo project: missing Cargo.lock" >&2
        exit 1
fi

# buildx is still experimental by default.
export DOCKER_CLI_EXPERIMENTAL=enabled

# We don't actually need to (necessarily) push artifacts, but we need a valid
#  repo we own. We sha the lockfile to bust the cache when dependencies change.
CACHE_REF="olix0r/cache:$(sha256sum Cargo.lock |cut -f1 -d' ')"

docker buildx build --load --cache-from="type=registry,ref=$CACHE_REF" --cache-to="type=registry,ref=$CACHE_REF"  -f- . <<EOF
# syntax=docker/dockerfile:experimental
FROM rust:1.38.0-buster
COPY . .
RUN --mount=type=cache,target=\$CARGO_HOME --mount=type=cache,target=./target cargo $@
EOF