liminix-fork/make-image.nix

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pkgs: config:
let
inherit (pkgs)
callPackage
lib
runCommand
s6-rc
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s6-init-files
stdenv
stdenvNoCC
writeScript
writeText;
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s6-rc-db = pkgs.s6-rc-database.override {
services = builtins.attrValues config.services;
};
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profile = writeScript ".profile" ''
PATH=${lib.makeBinPath (with pkgs; [ s6-init-bin busybox execline s6-linux-init s6-rc])}
export PATH
'';
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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/null c 0666 root root 1 3
/dev/zero c 0666 root root 1 5
/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/tty c 0777 root root 5 0
/dev/console c 0600 root root 5 1
/proc d 0555 root root
/sys d 0555 root root
/dev/pts d 0755 0 0
/etc/init.d d 0755 0 0
/bin/init s 0755 0 0 ${pkgs.s6-init-bin}/bin/init
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/bin/sh s 0755 0 0 ${pkgs.busybox}/bin/sh
/bin/busybox s 0755 0 0 ${pkgs.busybox}/bin/busybox
/etc/s6-rc d 0755 0 0
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/etc/s6-rc/compiled s 0755 0 0 ${s6-rc-db}/compiled
/etc/passwd f 0644 0 0 echo "root::0:0:root:/:/bin/sh"
/.profile s 0644 0 0 ${profile}
'';
storefs = callPackage <nixpkgs/nixos/lib/make-squashfs.nix> {
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# add pseudofiles to store so that the packages they
# depend on are also added
storeContents = [ pseudofiles s6-init-files ] ++ config.packages ;
# comp = "xz -Xdict-size 100%"
};
in runCommand "frob-squashfs" {
nativeBuildInputs = with pkgs.buildPackages; [ squashfsTools qprint ];
} ''
cp ${storefs} ./store.img
chmod +w store.img
mksquashfs - store.img -no-recovery -quiet -no-progress -root-becomes store -p "/ d 0755 0 0"
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mksquashfs - store.img -no-recovery -quiet -no-progress -root-becomes nix -pf ${pseudofiles} -pf ${s6-init-files}
cp store.img $out
''