nixpkgs/pkgs/shells/bash/default.nix

{ stdenv, fetchurl, readline ? null, interactive ? false, texinfo ? null, binutils ? null, bison }:

assert interactive -> readline != null;
assert stdenv.isDarwin -> binutils != null;

let
  version = "4.3";
  realName = "bash-${version}";
  shortName = "bash43";
  baseConfigureFlags = if interactive then "--with-installed-readline" else "--disable-readline";
  sha256 = "1m14s1f61mf6bijfibcjm9y6pkyvz6gibyl8p4hxq90fisi8gimg";

  inherit (stdenv.lib) optional optionalString;
in

stdenv.mkDerivation rec {
  name = "${realName}-p${toString (builtins.length patches)}";

  src = fetchurl {
    url = "mirror://gnu/bash/${realName}.tar.gz";
    inherit sha256;
  };

  hardeningDisable = [ "format" ];

  outputs = [ "out" "doc" "info" ];

  # the man pages are small and useful enough
  outputMan = if interactive then "out" else null;

  NIX_CFLAGS_COMPILE = ''
    -DSYS_BASHRC="/etc/bashrc"
    -DSYS_BASH_LOGOUT="/etc/bash_logout"
    -DDEFAULT_PATH_VALUE="/no-such-path"
    -DSTANDARD_UTILS_PATH="/no-such-path"
    -DNON_INTERACTIVE_LOGIN_SHELLS
    -DSSH_SOURCE_BASHRC
  '';

  patchFlags = "-p0";

  patches =
    (let
      patch = nr: sha256:
        fetchurl {
          url = "mirror://gnu/bash/${realName}-patches/${shortName}-${nr}";
          inherit sha256;
        };
    in
      import ./bash-4.3-patches.nix patch) 
      ++ optional stdenv.isCygwin ./cygwin-bash-4.3.33-1.src.patch;

  crossAttrs = {
    configureFlags = baseConfigureFlags +
      " bash_cv_job_control_missing=nomissing bash_cv_sys_named_pipes=nomissing" +
      optionalString stdenv.isCygwin ''
        --without-libintl-prefix --without-libiconv-prefix
        --with-installed-readline
        bash_cv_dev_stdin=present
        bash_cv_dev_fd=standard
        bash_cv_termcap_lib=libncurses
      '';
  };

  configureFlags = baseConfigureFlags;

  # Note: Bison is needed because the patches above modify parse.y.
  nativeBuildInputs = [bison]
    ++ optional (texinfo != null) texinfo
    ++ optional interactive readline
    ++ optional stdenv.isDarwin binutils;

  # Bash randomly fails to build because of a recursive invocation to
  # build `version.h'.
  enableParallelBuilding = false;

  postInstall = ''
    ln -s bash "$out/bin/sh"
  '';

  postFixup = if interactive
    then ''
      substituteInPlace "$out/bin/bashbug" \
        --replace '${stdenv.shell}' "$out/bin/bash"
    ''
    # most space is taken by locale data
    else ''
      rm -r "$out/share" "$out/bin/bashbug"
    '';

  meta = with stdenv.lib; {
    homepage = http://www.gnu.org/software/bash/;
    description =
      "GNU Bourne-Again Shell, the de facto standard shell on Linux" +
        (if interactive then " (for interactive use)" else "");

    longDescription = ''
      Bash is the shell, or command language interpreter, that will
      appear in the GNU operating system.  Bash is an sh-compatible
      shell that incorporates useful features from the Korn shell
      (ksh) and C shell (csh).  It is intended to conform to the IEEE
      POSIX P1003.2/ISO 9945.2 Shell and Tools standard.  It offers
      functional improvements over sh for both programming and
      interactive use.  In addition, most sh scripts can be run by
      Bash without modification.
    '';

    license = licenses.gpl3Plus;

    platforms = platforms.all;

    maintainers = [ maintainers.peti ];
  };

  passthru = {
    shellPath = "/bin/bash";
  };
}