nix-helpers: 657ddb952ca6cde8b20bb7719c72525406e0dfeb

     1: { bash, hasBinary, mkBin, withDeps, withNix }:
     2: 
     3: with builtins;
     4: with rec {
     5:   nixy = withNix { };
     6: 
     7:   pkg = mkBin {
     8:     name = "pipeToNix";
     9:     paths = nixy.buildInputs;
    10:     vars = removeAttrs nixy [ "buildInputs" ];
    11:     script = ''
    12:       #!${bash}/bin/bash
    13:       set -e
    14: 
    15:       # Dumps stdin to a temporary file, adds that file to the Nix store then
    16:       # deletes the temp file. If an argument is given, it's used as the file
    17:       # name (which Nix will prefix with a content hash).
    18: 
    19:       NAME="piped"
    20:       [[ -z "$1" ]] || NAME="$1"
    21: 
    22:       SCRATCH=$(mktemp -d)
    23:       trap "rm -rf $SCRATCH" EXIT
    24: 
    25:       F="$SCRATCH/$NAME"
    26:       cat > "$F"
    27: 
    28:       nix-store --add "$F"
    29:     '';
    30:   };
    31: };
    32: withDeps [ (hasBinary pkg "pipeToNix") ] pkg