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