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Monorepo for Tangled
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# run by busybox at sysinit setupScript = writeText "spindle-setup" '' #!/bin/sh
mountpoint -q /proc || mount -t proc proc /proc mountpoint -q /sys || mount -t sysfs sys /sys mountpoint -q /dev || mount -t devtmpfs dev /dev mountpoint -q /dev/pts || { install -d /dev/pts mount -t devpts devpts /dev/pts } mountpoint -q /dev/shm || { install -d /dev/shm mount -t tmpfs -o mode=1777 shm /dev/shm } mountpoint -q /run || mount -t tmpfs -o mode=0755 run /run mountpoint -q /tmp || mount -t tmpfs -o mode=1777 tmp /tmp
# setup xdg runtime dir, podman eg. needs it install -d -m 0700 -o spindle-workflow -g spindle-workflow /run/user/970
# cgroup2 setup, normally we would do this with rc-service # but minirootfs does not ship with those so we set it up ourselves. mountpoint -q /sys/fs/cgroup || { install -d /sys/fs/cgroup mount -t cgroup2 -o nsdelegate cgroup2 /sys/fs/cgroup chown -R spindle-workflow:spindle-workflow /sys/fs/cgroup 2>/dev/null || true }
# the initramfs mdev leaves these 0660, which breaks non-root workflows chmod 666 /dev/null /dev/zero /dev/full /dev/random /dev/urandom /dev/tty /dev/ptmx 2>/dev/null
modprobe vmw_vsock_virtio_transport # shuttle's cache enqueue listener binds a guest-local (CID 1) vsock modprobe vsock_loopback modprobe ext4
if [ -b /dev/vdb ]; then # setup disk backed nix store mount -t ext4 /dev/vdb /workspace install -d -o spindle-workflow -g spindle-workflow /workspace /workspace/repo install -d /workspace/.nix/rw-store /workspace/.nix/rw-store-work /workspace/.nix/build mount -t overlay overlay \ -o lowerdir=/nix/store,upperdir=/workspace/.nix/rw-store,workdir=/workspace/.nix/rw-store-work \ /nix/store fi
ip link set lo up ip link set eth0 up ip addr add 10.0.3.15/24 dev eth0 ip route add default via 10.0.3.2 hostname -F /etc/hostname '';
inittab = writeText "inittab" '' ::sysinit:/sbin/spindle-setup ::respawn:env TMPDIR=/workspace/.nix/build /usr/local/bin/nix-daemon ::respawn:env NIX_REMOTE=daemon /usr/bin/shuttle ::ctrlaltdel:/sbin/reboot '';
profileScript = writeText "spindle-profile" '' export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt export GIT_SSL_CAINFO=/etc/ssl/certs/ca-certificates.crt export NIX_REMOTE=daemon '';
# mirror nix/microvm/base.nix and nix/modules/shuttle.nix nixConf = writeText "nix.conf" '' experimental-features = nix-command flakes trusted-users = root spindle-workflow allowed-users = spindle-workflow post-build-hook = /usr/libexec/spindle-post-build-hook # keep build sandboxes on the /workspace disk, not the RAM-backed root tmpfs build-dir = /workspace/.nix/build !include /run/spindle/nix.conf '';
apkRepositories = writeText "apk-repositories" (builtins.concatStringsSep "\n" repositories + "\n");
postBuildHook = writeText "spindle-post-build-hook" '' #!/bin/sh set -f
if [ -z "''${OUT_PATHS:-}" ]; then exit 0 fi
# OUT_PATHS is intentionally split into individual store paths exec /usr/bin/shuttle enqueue-built-paths $OUT_PATHS '';
imageSpecJSON = writeText "spec.json" ( builtins.toJSON { inherit arch; bootArgs = "earlyprintk=ttyS0 console=hvc0 reboot=t panic=-1 root=/dev/vda rootfstype=squashfs modules=virtio_blk,virtio_net,virtio_console overlaytmpfs=yes init=/sbin/init"; kernel = "kernel"; initrd = "initrd"; runnerType = "qemu"; runnerConfig = { cpu = "host,+x2apic,-sgx"; machine = "microvm,accel=kvm:tcg,acpi=on,mem-merge=on,pcie=off,pic=off,pit=off,rtc=on,usb=off"; console = "hvc0"; extraArgs = []; }; memoryMiB = 4096; storeDisk = "store-disk"; storeDiskType = "squashfs"; vcpus = 2; shell = "/usr/local/bin/bash"; networkInterfaces = [ { type = "slirp4netns"; id = "net0"; mac = "02:00:00:00:10:01"; } ]; volumes = [ { fsType = "ext4"; image = "workspace.img"; imageType = "raw"; mountPoint = "/workspace"; readOnly = false; sizeMiB = 1024 * 16; # 16 GB } ]; } );in runCommand "spindle-alpine-image-${arch}" { nativeBuildInputs = [squashfsTools binutils]; } '' mkdir -p rootfs tar -xzpf ${rootfs} -C rootfs
# kernel modules from modloop (ships its own modules.dep, no depmod needed) unsquashfs -q -d modloop ${modloop} mkdir -p rootfs/lib/modules cp -a modloop/modules/* rootfs/lib/modules/
install -D -m 0755 ${shuttle}/bin/shuttle rootfs/usr/bin/shuttle install -D -m 0755 ${setupScript} rootfs/sbin/spindle-setup install -D -m 0644 ${inittab} rootfs/etc/inittab install -D -m 0644 ${profileScript} rootfs/etc/profile.d/01-spindle.sh install -D -m 0644 ${nixConf} rootfs/etc/nix/nix.conf install -D -m 0755 ${postBuildHook} rootfs/usr/libexec/spindle-post-build-hook
# install dependencies # we only copy binaries + libexec for minimal deps so the image size doesn't # increase so much (if we copy the whole guestTools closure for example, it # doubles the disk size) mkdir -p rootfs/nix/store rootfs/usr/local/bin for pkg in ${toString guestTools}; do for bin in "$pkg/bin/"*; do [[ -e "$bin" ]] || continue name=$(basename "$bin") # we resolve symlinks as to copy the actual binaries if [[ -L "$bin" ]]; then real=$(readlink "$bin") else real="$bin" fi # handle symlinks properly if [[ "$real" != /nix/store* ]]; then ln -vsf "$real" "rootfs/usr/local/bin/$name" else cp -v "$real" "rootfs/usr/local/bin/$name" fi done # libexec has binaries used by packages even if statically compiled if [[ -d "$pkg/libexec" ]]; then mkdir -p "rootfs$pkg" cp -av "$pkg/libexec" "rootfs$pkg/" fi done # this is necessary for nix to work, it is not a library but nix hardcodes # it in it's binary cp -rv ${publicsuffix-list} rootfs/nix/store/
# scripts commonly hardcode #!/bin/bash ln -sf ${bash}/bin/bash rootfs/bin/bash
echo "spindle-microvm" > rootfs/etc/hostname printf 'nameserver 127.0.0.1\n' > rootfs/etc/resolv.conf install -D -m 0644 ${apkRepositories} rootfs/etc/apk/repositories
echo "spindle-workflow:x:970:970:spindle workflow:/workspace:/bin/sh" >> rootfs/etc/passwd echo "spindle-workflow:x:970:" >> rootfs/etc/group echo "spindle-workflow:!::0:::::" >> rootfs/etc/shadow mkdir -p rootfs/workspace
# subordinate id ranges so the workflow user can run rootless containers # (podman/buildah): without these, user-namespace id mapping falls back to a # single 970->0 map and any layer that chowns to another uid fails. the range # is well clear of 970 and the 30000-block nixbld users. echo "spindle-workflow:100000:65536" >> rootfs/etc/subuid echo "spindle-workflow:100000:65536" >> rootfs/etc/subgid
# setup nix build users for the daemon members="" for i in $(seq 1 8); do echo "nixbld$i:x:$((30000 + i)):30000:nix build user $i:/var/empty:/sbin/nologin" >> rootfs/etc/passwd echo "nixbld$i:!::0:::::" >> rootfs/etc/shadow members="$members''${members:+,}nixbld$i" done echo "nixbld:x:30000:$members" >> rootfs/etc/group
mkdir -p "$out" mksquashfs rootfs "$out/store-disk" -comp zstd -Xcompression-level 19 -noappend -no-xattrs -all-root -quiet \ -p '/sbin/apk m 4755 0 0' # suid apk so spindle-workflow can use it without having to doas or smth cp ${kernel} "$out/kernel" cp ${initramfs} "$out/initrd" cp ${imageSpecJSON} "$out/spec.json" ''