92 lines
2.8 KiB
Nix
92 lines
2.8 KiB
Nix
{ stdenv
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, fetchurl
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, unzip
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}:
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stdenv.mkDerivation rec {
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pname = "dat";
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version = "13.13.1";
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suffix = {
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x86_64-darwin = "macos-x64";
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x86_64-linux = "linux-x64";
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}.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
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src = fetchurl {
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url = "https://github.com/datproject/dat/releases/download/v${version}/${pname}-${version}-${suffix}.zip";
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sha256 = {
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x86_64-darwin = "1qj38zn33hhr2v39jw14k2af091bafh5yvhs91h5dnjb2r8yxnaq";
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x86_64-linux = "0vgn57kf3j1pbfxlhj4sl1sm2gfd2gcvhk4wz5yf5mzq1vj9ivpv";
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}.${stdenv.hostPlatform.system} or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
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};
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buildInputs = [ unzip ];
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dontConfigure = true;
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dontBuild = true;
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dontStrip = true;
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dontPatchELF = true;
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installPhase = ''
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mkdir -p $out/bin
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mv dat $out/bin
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'';
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# dat is a node program packaged using zeit/pkg.
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# thus, it contains hardcoded offsets.
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# patchelf shifts these locations when it expands headers.
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# this could probably be generalised into allowing any program packaged
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# with zeit/pkg to be run on nixos.
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preFixup = let
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libPath = stdenv.lib.makeLibraryPath [stdenv.cc.cc];
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in stdenv.lib.optionalString (!stdenv.isDarwin) ''
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orig_size=$(stat --printf=%s $out/bin/dat)
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patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/bin/dat
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patchelf --set-rpath ${libPath} $out/bin/dat
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chmod +x $out/bin/dat
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new_size=$(stat --printf=%s $out/bin/dat)
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###### zeit-pkg fixing starts here.
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# we're replacing plaintext js code that looks like
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# PAYLOAD_POSITION = '1234 ' | 0
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# [...]
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# PRELUDE_POSITION = '1234 ' | 0
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# ^-----20-chars-----^^------22-chars------^
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# ^-- grep points here
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#
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# var_* are as described above
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# shift_by seems to be safe so long as all patchelf adjustments occur
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# before any locations pointed to by hardcoded offsets
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var_skip=20
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var_select=22
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shift_by=$(expr $new_size - $orig_size)
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function fix_offset {
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# $1 = name of variable to adjust
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location=$(grep -obUam1 "$1" $out/bin/dat | cut -d: -f1)
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location=$(expr $location + $var_skip)
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value=$(dd if=$out/bin/dat iflag=count_bytes,skip_bytes skip=$location \
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bs=1 count=$var_select status=none)
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value=$(expr $shift_by + $value)
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echo -n $value | dd of=$out/bin/dat bs=1 seek=$location conv=notrunc
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}
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fix_offset PAYLOAD_POSITION
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fix_offset PRELUDE_POSITION
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'';
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meta = with stdenv.lib; {
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description = "Peer-to-peer sharing and live synchronization of files";
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homepage = "https://dat.foundation/";
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license = licenses.bsd3;
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platforms = [ "x86_64-linux" "x86_64-darwin" ];
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maintainers = with maintainers; [ prusnak ];
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};
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}
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