pkgs/development/tools/swiftpm2nix/swiftpm2nix.sh

   1 #!/usr/bin/env bash
   2
   3 # Generates a Nix expression to fetch swiftpm dependencies, and a
   4 # configurePhase snippet to prepare a working directory for swift-build.
   5
   6 set -eu -o pipefail
   7 shopt -s lastpipe
   8
   9 stateFile=".build/workspace-state.json"
  10 if [[ ! -f "$stateFile" ]]; then
  11   echo >&2 "Missing $stateFile. Run 'swift package resolve' first."
  12   exit 1
  13 fi
  14
  15 stateVersion="$(jq .version $stateFile)"
  16 if [[ $stateVersion -lt 5 || $stateVersion -gt 6 ]]; then
  17   echo >&2 "Unsupported $stateFile version"
  18   exit 1
  19 fi
  20
  21 # Iterate dependencies and prefetch.
  22 hashes=""
  23 jq -r '.object.dependencies[] | "\(.subpath) \(.packageRef.location) \(.state.checkoutState.revision)"' $stateFile \
  24 | while read -r name url rev; do
  25   echo >&2 "-- Fetching $name"
  26   sha256="$(nix-prefetch-git --fetch-submodules $url $rev | jq -r .sha256)"
  27   hashes+="
  28     \"$name\" = \"$sha256\";"
  29   echo >&2
  30 done
  31 hashes+=$'\n'"  "
  32
  33 # Generate output.
  34 mkdir -p nix
  35 # Copy the workspace state, but clear 'artifacts'.
  36 jq '.object.artifacts = []' < $stateFile > nix/workspace-state.json
  37 # Build an expression for fetching sources, and preparing the working directory.
  38 cat > nix/default.nix << EOF
  39 # This file was generated by swiftpm2nix.
  40 {
  41   workspaceStateFile = ./workspace-state.json;
  42   hashes = {$hashes};
  43 }
  44 EOF
  45 echo >&2 "-- Generated ./nix"