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{ 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 ];
};
}
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