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rewrite systemconfig in C and link statically

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systemconfig (a.k.a "activate") is run from the initramfs. Converting
it from a shell script to an executable means it doesn't depend on
there being a shell in the initramfs
This commit is contained in:
Daniel Barlow
2023-04-15 17:15:44 +01:00
parent c744ef8c17
commit 1cc0b13b57
3 changed files with 77 additions and 26 deletions
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61
pkgs/systemconfig/default.nix
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@@ -1,13 +1,13 @@
# The ideal is that a Liminix system can boot with only the files in
# /nix/store. This package generates a script that is run at early
# /nix/store. This package generates a small program that is run at early
# boot (from the initramfs) to populate directories such as /etc,
# /bin, /home according to whatever the configuration says
# they should contain
{
writeText
, runCommand
, lib
, stdenv
}:
let
inherit (lib.attrsets) mapAttrsToList;
@@ -32,33 +32,46 @@ let
assert gid == 0;
let
pathname = "${prefix}/${filename}";
chmod =
let m = if mode != null then mode else
(if type == "d" then "0755" else "0644");
in (if type == "s"
then ""
else "\nchmod ${m} ${pathname}");
qpathname = builtins.toJSON pathname;
mode' = if mode != null
then mode
else
(if type == "d" then "0755" else "0644");
cmds = {
"f" = "printf \"${escaped file}\" > ${pathname}";
"d" = "mkdir ${pathname}\n" +
"f" = "PRINTFILE(${qpathname}, ${mode'}, ${builtins.toJSON (escaped file)});";
"d" = "MKDIR(${qpathname}, ${mode'});\n" +
(builtins.concatStringsSep "\n"
(visit pathname contents));
"c" = "mknod ${pathname} c ${major} ${minor}";
"b" = "mknod ${pathname} b ${major} ${minor}";
"s" = "ln -s ${target} ${pathname}";
"l" = "ln ${target} ${pathname}";
"i" = "mknod ${pathname} p";
"c" = "MKNOD_C(${qpathname}, ${mode'}, ${major}, ${minor});";
"b" = "MKNOD_B(${qpathname}, ${mode'}, ${major}, ${minor});";
"s" = "LN_S(${builtins.toJSON target}, ${qpathname});";
"l" = "LN(${builtins.toJSON target}, ${qpathname})";
"i" = "MKNOD_P(${qpathname}, ${mode'});";
};
cmd = cmds.${type};
in "${cmd}${chmod}";
in "${cmd}";
in mapAttrsToList (makeFile prefix) attrset;
activateScript = attrset: writeText "systemConfig" ''
#!/bin/sh
t=$1
${(builtins.concatStringsSep "\n" (visit "$t" attrset))}
activateScript = attrset: writeText "makedevs.c" ''
#include "defs.h"
int main(int argc, char* argv[]) {
chdir(argv[1]);
${(builtins.concatStringsSep "\n" (visit "." attrset))}
}
'';
in attrset:
runCommand "make-stuff" {} ''
mkdir -p $out
ln -s ${activateScript attrset} $out/activate
''
stdenv.mkDerivation {
name="make-stuff";
src = ./.;
CFLAGS = "-Os";
LDFLAGS = "-static";
postConfigure = ''
cp ${activateScript attrset} makedevs.c
'';
makeFlags = ["makedevs"];
installPhase = ''
mkdir -p $out/bin
$STRIP --remove-section=.note --remove-section=.comment --strip-all makedevs -o $out/bin/activate
'';
}