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|
let
# nix-shell -E 'import (builtins.fetchurl "$url")'
# NIX_CONFIG="sandbox = relaxed" nix-shell --option builders '' cake.nix
name = "nix-shell.cake";
pkgs = import (builtins.fetchTarball {
url = "https://releases.nixos.org/nixos/22.11/nixos-22.11.466.596a8e828c5/nixexprs.tar.xz";
sha256 = "1367bad5zz0mfm4czb6p0s0ni38f0x1ffh02z76rx4nranipqbgg";
}) { };
alpine-3-12-amd64 = pkgs.dockerTools.exportImage {
fromImage = pkgs.dockerTools.pullImage rec {
imageName = "alpine";
imageDigest = "sha256:2a8831c57b2e2cb2cda0f3a7c260d3b6c51ad04daea0b3bfc5b55f489ebafd71";
sha256 = "1px8xhk0a3b129cc98d3wm4s0g1z2mahnrxd648gkdbfsdj9dlxp";
finalImageName = imageName;
finalImageTag = "3.12";
};
diskSize = "128";
};
cook = { name, src, contents ? [ ], path ? [ ], script ? "", prepare ? "", cleanup ? "" }: pkgs.stdenvNoCC.mkDerivation {
__noChroot = true;
inherit name src contents;
phases = [ "installPhase" ];
buildInputs = [ pkgs.proot pkgs.rsync pkgs.tree pkgs.kmod ];
bootstrap = pkgs.writeScript "bootstrap-${name}" ''
${script}
rm "$0"
'';
PROOT_NO_SECCOMP = "1";
installPhase = ''
set -euo pipefail
mkdir --parents rootfs $out/rootfs
tar --extract --file=${src} -C rootfs
${prepare}
cp $bootstrap rootfs/bootstrap
proot --cwd=/ --root-id --rootfs=rootfs /usr/bin/env - /bin/sh -euc '. /etc/profile && /bootstrap'
printf 'PATH=${pkgs.lib.strings.makeBinPath path}:$PATH' >> rootfs/etc/profile
[ -n "$contents" ] && {
printf "\n"
for paths in $contents; do
printf "Cooking... Adding %s \n" "$paths"
rsync --copy-dirlinks --relative --archive --chown=0:0 "$paths/" "rootfs" || exit 1
done
printf "\n"
} || printf '\n%s\n' 'No contents to cook.';
${cleanup}
printf '\n%s\n\n' "$(du --all --max-depth 1 --human-readable rootfs | sort --human-numeric-sort)"
cp --recursive --no-target-directory rootfs $out/rootfs
'';
};
bake = { name, image, size ? "1G", debug ? false, kernel ? pkgs.linux, options ? [ ], modules ? [ ], uuid ? "99999999-9999-9999-9999-999999999999" }: let
initrd = cook {
name = "initrd-${name}";
src = alpine-3-12-amd64;
script = ''
rm -rf home opt media root run srv tmp var
printf '#!/bin/sh -eu
mount -t devtmpfs none /dev
mount -t proc none /proc
mount -t sysfs none /sys
sh /lib/modules/initrd/init
${pkgs.lib.optionalString (debug) "sh +m"}
mount -r "$(findfs UUID=${uuid})" /mnt
mount -o move /dev /mnt/dev
umount /proc /sys
exec switch_root /mnt /sbin/init
' > init
chmod +x init
find . ! -name bootstrap ! -name initramfs.cpio | cpio -H newc -ov > initramfs.cpio
gzip -9 initramfs.cpio
'';
prepare = ''
modules='${pkgs.lib.strings.concatMapStringsSep " " (module: module) modules}'
initrd_directory=rootfs/lib/modules/initrd
[ -n "$modules" ] && {
mkdir --parents "$initrd_directory"
printf "\n"
for module in $modules; do
module_file=$(find ${kernel} -name "$module.ko*" -type f)
module_basename=$(basename "$module_file")
printf "Cooking initrd... Adding module %s \n" "$module"
cp "$module_file" "$initrd_directory" || exit 1
printf 'insmod /lib/modules/initrd/%s\n' "$module_basename" >> "$initrd_directory/init"
done
} || printf '\n%s\n' 'No modules to cook.'
'';
}; in pkgs.writeScript name ''
set -euo pipefail
PATH=${pkgs.lib.strings.makeBinPath [
pkgs.coreutils
pkgs.e2fsprogs
pkgs.gawk
pkgs.rsync
pkgs.syslinux
pkgs.tree
pkgs.utillinux
]}
IMAGE=${name}.img
LOOP=/dev/loop0
ROOTFS=rootfs
rm "$IMAGE" || true
fallocate --length ${size} $IMAGE && chmod o+rw "$IMAGE"
printf 'o\nn\np\n1\n2048\n\na\nw\n' | fdisk "$IMAGE"
dd bs=440 count=1 conv=notrunc if=${pkgs.syslinux}/share/syslinux/mbr.bin of="$IMAGE"
mkdir --parents "$ROOTFS"
umount --verbose "$ROOTFS" || true
losetup --detach "$LOOP" || true
losetup --offset "$((2048 * 512))" "$LOOP" "$IMAGE"
mkfs.ext4 -U ${uuid} "$LOOP"
mount --verbose "$LOOP" "$ROOTFS"
rsync --archive --chown=0:0 "${image}/rootfs/" "$ROOTFS";
mkdir --parents "$ROOTFS/boot"
cp ${kernel}/bzImage "$ROOTFS/boot/vmlinux"
cp ${initrd}/rootfs/initramfs.cpio.gz "$ROOTFS/boot/initrd"
printf '
DEFAULT linux
LABEL linux
LINUX /boot/vmlinux
INITRD /boot/initrd
APPEND ${pkgs.lib.strings.concatMapStringsSep " " (option: option) options}
' > "$ROOTFS/boot/syslinux.cfg"
extlinux --heads 64 --sectors 32 --install $ROOTFS/boot
printf '\n%s\n\n' "$(du --max-depth 1 --human-readable $ROOTFS | sort --human-numeric-sort)"
umount --verbose "$ROOTFS"
rm -r "$ROOTFS"
losetup --detach "$LOOP"
'';
alpine = cook {
name = "alpine";
src = alpine-3-12-amd64;
contents = [ pkgs.glibc pkgs.gawk ];
path = [ pkgs.gawk ];
script = ''
cat /etc/alpine-release
sed -i 's/#ttyS0/ttyS0/' /etc/inittab
printf 'migh7Lib\nmigh7Lib\n' | adduser alpine
'';
};
alpine-machine = bake {
name = "alpine-machine";
image = alpine;
kernel = pkgs.linuxPackages_5_10.kernel;
options = [ "console=tty1" "console=ttyS0" ];
size = "128M";
modules = [
"virtio"
"virtio_ring"
"virtio_blk"
"virtio_pci"
"jbd2"
"mbcache"
"crc16"
"crc32c_generic"
"ext4"
];
};
container = { rootfs, binds ? [ ], options ? [] }:
pkgs.writeScript name ''
set -euxo pipefail
PATH=${pkgs.lib.strings.makeBinPath [ pkgs.proot ]}
proot \
--cwd=/ \
--rootfs='${rootfs}' \
${pkgs.lib.strings.concatMapStringsSep " " (option: "--bind=${option}") binds} \
${pkgs.lib.strings.concatMapStringsSep " " (value: value) options} \
/usr/bin/env - /bin/sh -c '. /etc/profile && sh'
'';
in pkgs.mkShell {
inherit name;
buildInputs = [ pkgs.proot pkgs.qemu ];
shellHook = ''
export PS1='\h (${name}) \W \$ '
# sudo ${alpine-machine}
# doas ${alpine-machine}
# qemu-system-x86_64 -nographic -drive if=virtio,file=./${alpine-machine.name}.img,format=raw
# qemu-system-x86_64 -curses -drive if=virtio,file=./${alpine-machine.name}.img,format=raw
${container {
rootfs = "${alpine}/rootfs";
binds = [ "/proc" "/dev" ];
options = [ "--verbose=0" ];
}}
exit
'';
}
|
