liminix-fork/modules/busybox.nix
2023-03-10 23:14:13 +00:00

84 lines
3 KiB
Nix

{ lib, pkgs, config, ...}:
let
inherit (lib) mkOption mkEnableOption types mapAttrsToList;
inherit (pkgs.pseudofile) dir symlink;
inherit (lib.strings) toUpper;
attrs = { options, applets } :
let
extraOptions = builtins.concatStringsSep "\n"
(mapAttrsToList (n: v: "CONFIG_${toUpper n} ${toString v}") options);
appletOptions = builtins.concatStringsSep "\n"
(map (n: "CONFIG_${toUpper n} y") applets);
in {
enableMinimal = true;
extraConfig = ''
${extraOptions}
${appletOptions}
'';
};
cfg = config.programs.busybox;
busybox = pkgs.busybox.override (attrs { inherit (cfg) applets options; });
makeLinks = lib.attrsets.genAttrs
cfg.applets
(a: symlink "${busybox}/bin/busybox");
minimalApplets = [
# this is probably less minimal than it could be
"arch" "ash" "base64" "basename" "bc" "brctl" "bunzip2" "bzcat"
"bzip2" "cal" "cat" "chattr" "chgrp" "chmod" "chown" "chpst"
"chroot" "clear" "cmp" "comm" "cp" "cpio" "cut" "date" "dd" "df"
"dirname" "dmesg" "du" "echo" "egrep" "env" "expand" "expr"
"false" "fdisk" "fgrep" "find" "free" "fuser" "grep" "gunzip"
"gzip" "head" "hexdump" "hostname" "hwclock" "ifconfig" "ip"
"ipaddr" "iplink" "ipneigh" "iproute" "iprule" "kill" "killall"
"killall5" "less" "ln" "ls" "lsattr" "lsof" "md5sum" "mkdir"
"mknod" "mktemp" "mount" "mv" "nc" "netstat" "nohup" "od" "pgrep"
"pidof" "ping" "ping6" "pkill" "pmap" "printenv" "printf" "ps"
"pwd" "readlink" "realpath" "reset" "rm" "rmdir" "route" "sed"
"seq" "setsid" "sha1sum" "sha256sum" "sha512sum" "sleep" "sort"
"stat" "strings" "stty" "su" "sum" "swapoff" "swapon" "sync"
"tail" "tee" "test" "time" "touch" "tr" "traceroute" "traceroute6"
"true" "truncate" "tty" "udhcpc" "udhcpc6" "umount" "uname"
"unexpand" "uniq" "unlink" "unlzma" "unxz" "unzip" "uptime"
"watch" "wc" "whoami" "xargs" "xxd" "xz" "xzcat" "yes" "zcat"
];
in {
options = {
programs.busybox = {
applets = mkOption {
type = types.listOf types.str;
default = [];
example = ["sh" "getty" "login"];
};
options = mkOption {
# mostly the values are y n or m, but sometimes
# other strings are also used
type = types.attrsOf types.nonEmptyStr;
default = { };
};
};
};
config = {
programs.busybox = {
applets = minimalApplets;
options = {
ASH_ECHO = "y";
# ASH_OPTIMIZE_FOR_SIZE = "y";
BASH_IS_NONE = "y";
SH_IS_ASH = "y";
ASH_BASH_COMPAT = "y";
FEATURE_EDITING = "y"; # readline-ish command editing
FEATURE_EDITING_HISTORY = "128";
FEATURE_EDITING_MAX_LEN = "1024";
FEATURE_TAB_COMPLETION = "y";
FEATURE_EDITING_WINCH = "y";
};
};
filesystem = dir {
bin = dir ({
busybox = symlink "${busybox}/bin/busybox";
sh = symlink "${busybox}/bin/busybox";
} // makeLinks);
};
};
}