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busybox.nix (4063B)

      1 ## Busybox
      2 ## =======
      3 ##
      4 ## Busybox provides stripped-down versions of many usual
      5 ## Linux/Unix tools, and may be configured to include only
      6 ## the commands (termed "applets") required by the user or
      7 ## by other included modules.
      8 
      9 {
     10   lib,
     11   pkgs,
     12   config,
     13   ...
     14 }:
     15 let
     16   inherit (lib) mkOption types mapAttrsToList;
     17   inherit (pkgs.pseudofile) dir symlink;
     18   inherit (lib.strings) toUpper;
     19 
     20   attrs =
     21     { options, applets }:
     22     let
     23       extraOptions = builtins.concatStringsSep "\n" (
     24         mapAttrsToList (n: v: "CONFIG_${toUpper n} ${toString v}") options
     25       );
     26       appletOptions = builtins.concatStringsSep "\n" (map (n: "CONFIG_${toUpper n} y") applets);
     27     in
     28     {
     29       enableMinimal = true;
     30       extraConfig = ''
     31         ${extraOptions}
     32         ${appletOptions}
     33       '';
     34     };
     35   cfg = config.programs.busybox;
     36   busybox = pkgs.busybox.override (attrs {
     37     inherit (cfg) applets options;
     38   });
     39   makeLinks = lib.attrsets.genAttrs cfg.applets (a: symlink "${busybox}/bin/busybox");
     40   minimalApplets = [
     41     # this is probably less minimal than it could be
     42     "arch"
     43     "ash"
     44     "base64"
     45     "basename"
     46     "bc"
     47     "brctl"
     48     "bunzip2"
     49     "bzcat"
     50     "bzip2"
     51     "cal"
     52     "cat"
     53     "chattr"
     54     "chgrp"
     55     "chmod"
     56     "chown"
     57     "chpst"
     58     "chroot"
     59     "clear"
     60     "cmp"
     61     "comm"
     62     "cp"
     63     "cpio"
     64     "cut"
     65     "date"
     66     "dhcprelay"
     67     "dd"
     68     "df"
     69     "dirname"
     70     "dmesg"
     71     "du"
     72     "echo"
     73     "egrep"
     74     "env"
     75     "expand"
     76     "expr"
     77     "false"
     78     "fdisk"
     79     "fgrep"
     80     "find"
     81     "free"
     82     "fuser"
     83     "grep"
     84     "gunzip"
     85     "gzip"
     86     "head"
     87     "hexdump"
     88     "hostname"
     89     "hwclock"
     90     "ifconfig"
     91     "ip"
     92     "ipaddr"
     93     "iplink"
     94     "ipneigh"
     95     "iproute"
     96     "iprule"
     97     "kill"
     98     "killall"
     99     "killall5"
    100     "less"
    101     "ln"
    102     "ls"
    103     "lsattr"
    104     "lsof"
    105     "md5sum"
    106     "mkdir"
    107     "mknod"
    108     "mktemp"
    109     "mount"
    110     "mv"
    111     "nc"
    112     "netstat"
    113     "nohup"
    114     "od"
    115     "pgrep"
    116     "pidof"
    117     "ping"
    118     "ping6"
    119     "pkill"
    120     "pmap"
    121     "printenv"
    122     "printf"
    123     "ps"
    124     "pwd"
    125     "readlink"
    126     "realpath"
    127     "reset"
    128     "rm"
    129     "rmdir"
    130     "route"
    131     "sed"
    132     "seq"
    133     "setsid"
    134     "sha1sum"
    135     "sha256sum"
    136     "sha512sum"
    137     "sleep"
    138     "sort"
    139     "stat"
    140     "strings"
    141     "stty"
    142     "su"
    143     "sum"
    144     "swapoff"
    145     "swapon"
    146     "sync"
    147     "tail"
    148     "tee"
    149     "test"
    150     "time"
    151     "touch"
    152     "tr"
    153     "traceroute"
    154     "traceroute6"
    155     "true"
    156     "truncate"
    157     "tty"
    158     "udhcpc"
    159     "umount"
    160     "uname"
    161     "unexpand"
    162     "uniq"
    163     "unlink"
    164     "unlzma"
    165     "unxz"
    166     "unzip"
    167     "uptime"
    168     "watch"
    169     "wc"
    170     "whoami"
    171     "xargs"
    172     "xxd"
    173     "xz"
    174     "xzcat"
    175     "yes"
    176     "zcat"
    177   ];
    178 in
    179 {
    180   options = {
    181     programs.busybox = {
    182       applets = mkOption {
    183         type = types.listOf types.str;
    184         description = "Applets required";
    185         default = [ ];
    186         example = [
    187           "sh"
    188           "getty"
    189           "login"
    190         ];
    191       };
    192       options = mkOption {
    193         # mostly the values are y n or m, but sometimes
    194         # other strings are also used
    195         description = "Other busybox config flags that do not map directly to applet names (often prefixed FEATURE_)";
    196         type = types.attrsOf types.nonEmptyStr;
    197         default = { };
    198         example = {
    199           FEATURE_DD_IBS_OBS = "y";
    200         };
    201       };
    202     };
    203   };
    204   config = {
    205     programs.busybox = {
    206       applets = minimalApplets;
    207       options = {
    208         ASH_ECHO = "y";
    209         # ASH_OPTIMIZE_FOR_SIZE = "y";
    210         BASH_IS_NONE = "y";
    211         SH_IS_ASH = "y";
    212         ASH_BASH_COMPAT = "y";
    213         FEATURE_EDITING = "y"; # readline-ish command editing
    214         FEATURE_EDITING_HISTORY = "128";
    215         FEATURE_EDITING_MAX_LEN = "1024";
    216         FEATURE_TAB_COMPLETION = "y";
    217         FEATURE_EDITING_WINCH = "y";
    218         FEATURE_IPV6 = "y";
    219       };
    220     };
    221     filesystem = dir {
    222       bin = dir (
    223         {
    224           busybox = symlink "${busybox}/bin/busybox";
    225           sh = symlink "${busybox}/bin/busybox";
    226         }
    227         // makeLinks
    228       );
    229     };
    230   };
    231 }