nix - `nix-build hello.nix`时失败

Question

我按照 http://lethalman.blogspot.com/2014/08/nix-pill-8-generic-builders.html 上的步骤操作构建 GNU Hello，这是我用来构建 GNU hello 2.9 的文件:

$ wget -c http://ftp.gnu.org/gnu/hello/hello-2.9.tar.gz

你好.nix:

$ cat hello.nix
let
  pkgs = import <nixpkgs> {};
  mkDerivation = import ./autotools.nix pkgs;
in mkDerivation {
  name = "hello";
  src = ./hello-2.9.tar.gz;
}

autotools.nix:

$ cat autotools.nix
pkgs: attrs:
  with pkgs;
  let defaultAttrs = {
    builder = "${bash}/bin/bash";
    args = [ ./builder.sh ];
    baseInputs = [ gnutar gzip gnumake gcc binutils coreutils gawk gnused gnugrep ];
    buildInputs = [];
    system = builtins.currentSystem;
  };
  in
  derivation (defaultAttrs // attrs)

构建器.sh:

$ cat builder.sh
set -e
unset PATH
for p in $buildInputs; do
  export PATH=$p/bin${PATH:+:}$PATH
done

tar -xf $src

for d in *; do
  if [ -d "$d" ]; then
    cd "$d"
    break
  fi
done

./configure --prefix=$out
make
make install

错误信息:

$ nix-build hello.nix
these derivations will be built:
  /nix/store/d84l57agx3rmw00lxs8gjlw8srmx1bh9-hello.drv
building '/nix/store/d84l57agx3rmw00lxs8gjlw8srmx1bh9-hello.drv'...
/nix/store/vv3xqdggviqqbvym25jf2pwv575y9j1r-builder.sh: line 7: tar: No such file or directory
builder for '/nix/store/d84l57agx3rmw00lxs8gjlw8srmx1bh9-hello.drv' failed with exit code 127
error: build of '/nix/store/d84l57agx3rmw00lxs8gjlw8srmx1bh9-hello.drv' failed

autotools.nix 中似乎有gnutar，但构建器仍然提示tar: No such file or directory，这是为什么呢？

Answer 1

问题可能是 gnutar 在 baseInputs 列表中，而您从中构建 PATH 的 buildInputs 列表完全是空的，所以你的路径上不会有任何东西。尝试更改 shell 脚本中的 for 行，以便它使用两个列表的连接来构建路径:

for p in $baseInputs $buildInputs; do

您可以将 echo $PATH 添加到构建器脚本中以调试此类问题。

这就是博文作者要求您在博文中的这句话中做的事情:

Complete the new builder.sh by adding $baseInputs in the for loop together with $buildInputs.