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#!/usr/bin/env bash
# Generates a Nix expression to fetch swiftpm dependencies, and a
# configurePhase snippet to prepare a working directory for swift-build.
set -eu -o pipefail
shopt -s lastpipe
stateFile=".build/workspace-state.json"
if [[ ! -f "$stateFile" ]]; then
echo >&2 "Missing $stateFile. Run 'swift package resolve' first."
exit 1
fi
stateVersion="$(jq .version $stateFile)"
if [[ $stateVersion -lt 5 || $stateVersion -gt 6 ]]; then
echo >&2 "Unsupported $stateFile version"
exit 1
fi
# Iterate dependencies and prefetch.
hashes=""
jq -r '.object.dependencies[] | "\(.subpath) \(.packageRef.location) \(.state.checkoutState.revision)"' $stateFile \
| while read -r name url rev; do
echo >&2 "-- Fetching $name"
sha256="$(nix-prefetch-git $url $rev | jq -r .sha256)"
hashes+="
\"$name\" = \"$sha256\";"
echo >&2
done
hashes+=$'\n'" "
# Generate output.
mkdir -p nix
# Copy the workspace state, but clear 'artifacts'.
jq '.object.artifacts = []' < $stateFile > nix/workspace-state.json
# Build an expression for fetching sources, and preparing the working directory.
cat > nix/default.nix << EOF
# This file was generated by swiftpm2nix.
{
workspaceStateFile = ./workspace-state.json;
hashes = {$hashes};
}
EOF
echo >&2 "-- Generated ./nix"
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