tjh.dev
nixpkgs mirror (for testing)
github.com/NixOS/nixpkgs
nix
1{ stdenv, lib, fetchurl }:
2stdenv.mkDerivation rec {
3 pname = "now-cli";
4 version = "15.8.7";
5
6 # TODO: switch to building from source, if possible
7 src = fetchurl {
8 url = "https://github.com/zeit/now-cli/releases/download/${version}/now-linux.gz";
9 sha256 = "1x6nsn9qmsy4hk7l2dsyabc7fxkwwwl1y1852vs4dgxi8w1hax93";
10 };
11
12 sourceRoot = ".";
13 unpackCmd = ''
14 gunzip -c $curSrc > now-linux
15 '';
16
17 buildPhase = ":";
18
19 installPhase = ''
20 mkdir $out
21 mkdir $out/bin
22 cp now-linux $out/bin/now
23 '';
24
25 # now is a node program packaged using zeit/pkg.
26 # thus, it contains hardcoded offsets.
27 # patchelf shifts these locations when it expands headers.
28
29 # this could probably be generalised into allowing any program packaged
30 # with zeit/pkg to be run on nixos.
31
32 preFixup = let
33 libPath = lib.makeLibraryPath [stdenv.cc.cc];
34 in ''
35
36 orig_size=$(stat --printf=%s $out/bin/now)
37
38 patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/bin/now
39 patchelf --set-rpath ${libPath} $out/bin/now
40 chmod +x $out/bin/now
41
42 new_size=$(stat --printf=%s $out/bin/now)
43
44 ###### zeit-pkg fixing starts here.
45 # we're replacing plaintext js code that looks like
46 # PAYLOAD_POSITION = '1234 ' | 0
47 # [...]
48 # PRELUDE_POSITION = '1234 ' | 0
49 # ^-----20-chars-----^^------22-chars------^
50 # ^-- grep points here
51 #
52 # var_* are as described above
53 # shift_by seems to be safe so long as all patchelf adjustments occur
54 # before any locations pointed to by hardcoded offsets
55
56 var_skip=20
57 var_select=22
58 shift_by=$(expr $new_size - $orig_size)
59
60 function fix_offset {
61 # $1 = name of variable to adjust
62 location=$(grep -obUam1 "$1" $out/bin/now | cut -d: -f1)
63 location=$(expr $location + $var_skip)
64
65 value=$(dd if=$out/bin/now iflag=count_bytes,skip_bytes skip=$location \
66 bs=1 count=$var_select status=none)
67 value=$(expr $shift_by + $value)
68
69 echo -n $value | dd of=$out/bin/now bs=1 seek=$location conv=notrunc
70 }
71
72 fix_offset PAYLOAD_POSITION
73 fix_offset PRELUDE_POSITION
74
75 '';
76 dontStrip = true;
77
78
79
80 meta = with stdenv.lib; {
81 homepage = https://zeit.co/now;
82 description = "The Command Line Interface for Now - Global Serverless Deployments";
83 license = licenses.asl20;
84 platforms = platforms.linux;
85 maintainers = [ maintainers.bhall ];
86 };
87}