{ stdenv, lib, fetchurl }: stdenv.mkDerivation rec { pname = "now-cli"; version = "15.8.7"; # TODO: switch to building from source, if possible src = fetchurl { url = "https://github.com/zeit/now-cli/releases/download/${version}/now-linux.gz"; sha256 = "1x6nsn9qmsy4hk7l2dsyabc7fxkwwwl1y1852vs4dgxi8w1hax93"; }; sourceRoot = "."; unpackCmd = '' gunzip -c $curSrc > now-linux ''; dontBuild = true; installPhase = '' mkdir $out mkdir $out/bin cp now-linux $out/bin/now ''; # now is a node program packaged using zeit/pkg. # thus, it contains hardcoded offsets. # patchelf shifts these locations when it expands headers. # this could probably be generalised into allowing any program packaged # with zeit/pkg to be run on nixos. preFixup = let libPath = lib.makeLibraryPath [stdenv.cc.cc]; in '' orig_size=$(stat --printf=%s $out/bin/now) patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/bin/now patchelf --set-rpath ${libPath} $out/bin/now chmod +x $out/bin/now new_size=$(stat --printf=%s $out/bin/now) ###### zeit-pkg fixing starts here. # we're replacing plaintext js code that looks like # PAYLOAD_POSITION = '1234 ' | 0 # [...] # PRELUDE_POSITION = '1234 ' | 0 # ^-----20-chars-----^^------22-chars------^ # ^-- grep points here # # var_* are as described above # shift_by seems to be safe so long as all patchelf adjustments occur # before any locations pointed to by hardcoded offsets var_skip=20 var_select=22 shift_by=$(expr $new_size - $orig_size) function fix_offset { # $1 = name of variable to adjust location=$(grep -obUam1 "$1" $out/bin/now | cut -d: -f1) location=$(expr $location + $var_skip) value=$(dd if=$out/bin/now iflag=count_bytes,skip_bytes skip=$location \ bs=1 count=$var_select status=none) value=$(expr $shift_by + $value) echo -n $value | dd of=$out/bin/now bs=1 seek=$location conv=notrunc } fix_offset PAYLOAD_POSITION fix_offset PRELUDE_POSITION ''; dontStrip = true; meta = with lib; { homepage = "https://zeit.co/now"; description = "The Command Line Interface for Now - Global Serverless Deployments"; license = licenses.asl20; platforms = platforms.linux; maintainers = [ maintainers.bhall ]; }; }