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boots to userland and runs busybox init

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This commit is contained in:
Daniel Barlow
2022-09-20 23:04:08 +01:00
parent b2f7a429f7
commit 6be5b90c96
6 changed files with 102 additions and 28 deletions
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54
make-image.nix
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@@ -1,6 +1,14 @@
pkgs: config:
let
inherit (pkgs) callPackage stdenvNoCC closureInfo stdenv writeText s6-rc;
inherit (pkgs)
callPackage
closureInfo
runCommand
s6-rc
stdenv
stdenvNoCC
writeScript
writeText;
# we need to generate s6 db, by generating closure of all
# config.services and calling s6-rc-compile on them
@@ -28,8 +36,46 @@ let
s6-rc-compile $out/compiled $srcs
'';
};
makeSquashfs = callPackage <nixpkgs/nixos/lib/make-squashfs.nix> {
storeContents = [ s6db ] ++ config.packages ;
rcS = writeScript "rcS" ''
#!${pkgs.pkgsStatic.busybox}/bin/sh
echo WHEEEE
PATH=${pkgs.pkgsStatic.busybox}/bin:$PATH
export PATH
mount -t devtmpfs none /dev/
mount -t devpts none /dev/pts
mount -t proc none /proc
mkdir -p /run/services
'';
storefs = callPackage <nixpkgs/nixos/lib/make-squashfs.nix> {
storeContents = [ rcS pkgs.pkgsStatic.busybox s6db pkgs.s6-linux-init ] ++ config.packages ;
# comp = "xz -Xdict-size 100%"
};
in makeSquashfs
pseudofiles = writeText "pseudofiles" ''
/ d 0755 0 0
/bin d 0755 0 0
/etc d 0755 0 0
/run d 0755 0 0
/dev d 0755 0 0
/dev/console c 0600 root root 5 1
/dev/null c 0666 root root 1 3
/dev/tty c 0777 root root 5 0
/dev/tty1 c 0777 root root 4 1
/dev/tty2 c 0777 root root 4 2
/dev/tty3 c 0777 root root 4 3
/dev/tty4 c 0777 root root 4 4
/dev/zero c 0666 root root 1 5
/proc d 0555 root root
/dev/pts d 0755 0 0
/etc/init.d d 0755 0 0
/bin/init s 0755 0 0 ${pkgs.pkgsStatic.busybox}/bin/init
/bin/sh s 0755 0 0 ${pkgs.pkgsStatic.busybox}/bin/sh
/bin/busybox s 0755 0 0 ${pkgs.pkgsStatic.busybox}/bin/busybox
/etc/init.d/rcS s 0755 0 0 ${rcS}
'';
in runCommand "frob-squashfs" {} ''
cp ${storefs} ./store.img
chmod +w store.img
${pkgs.buildPackages.squashfsTools}/bin/mksquashfs - store.img -no-recovery -quiet -no-progress -root-becomes store -p "/ d 0755 0 0"
${pkgs.buildPackages.squashfsTools}/bin/mksquashfs - store.img -no-recovery -quiet -no-progress -root-becomes nix -pf ${pseudofiles}
cp store.img $out
''