chimera-pyinfra/install-bios.py

import string
import random

from pyinfra.operations import server, files


def generate_password(length=20):
    characters = string.ascii_letters + string.digits
    password = "".join(random.choice(characters) for _ in range(length))
    return password


# User to setup
username = input("Username for regular user: ")

## Determine the disk to install on to
disk = input("Disk device (E.g. /dev/vda): ")
if not disk.startswith("/dev"):
    cont = input(f"{disk} does not start with /dev. Continue [y/n]? ")
    if cont != "y":
        exit(1)

rootpw = generate_password()
print(f"Password for root will be: {rootpw}")

ok = input(f"Install onto {disk} [y/n]? ")
if ok != "y":
    exit(1)

# TODO: Make this data?
user_ssh_key = ""

# partition the disk

files.put(
    name="Upload partition layout",
    src="files/partition-map-bios.sfdisk",
    dest="/tmp/partition-map-bios.sfdisk",
    mode=True,
    create_remote_dir=False,
)

server.shell(name="Wipe the disk", commands=[f"wipefs -a {disk}"])

server.shell(
    name="Partition the disk",
    commands=[f"sfdisk {disk} < /tmp/partition-map-bios.sfdisk"],
)

root = f"{disk}1"

server.shell(name="Format partitions", commands=[f"mkfs.ext4 {root}"])

files.directory(name="Create mount point for root", path="/media/root")

server.mount(name="Mount root", path="/media/root", device=root)

files.directory(
    name="Ensure target permissions are right", path="/media/root", mode="755"
)

server.shell(
    name="Bootstrap system",
    commands=["chimera-bootstrap /media/root base-minimal mkfs"],
)

server.shell(name="Update packages", commands=["chimera-chroot /media/root apk update"])

server.shell(
    name="Upgrade packages",
    commands=["chimera-chroot /media/root apk upgrade --available"],
)

server.shell(
    name="Add kernel package",
    commands=["chimera-chroot /media/root apk add linux-lts"],
)

server.shell(
    name="Add swap",
    commands=[
        "chimera-chroot /media/root mkswap -U clear --size 512M --file /swapfile",
        "chimera-chroot /media/root swapon /swapfile",
    ],
)

server.shell(
    name="Generate fstab", commands=["genfstab -U /media/root >> /media/root/etc/fstab"]
)

extra_packages = [
    "chimerautils-extra",
    "dhcpcd",
    "dmesg",
    "dosfstools",
    "e2fsprogs",
    "file",
    "initramfs-tools",
    "iproute2",
    "iputils",
    "less",
    "opendoas",
    "openssh",
    "syslog-ng",
]
server.shell(
    name="Add extra packages",
    commands=[f"chimera-chroot /media/root apk add {' '.join(extra_packages)}"],
)

server.shell(
    name="Enable ssh, dhcpcd, and syslog",
    commands=[
        "chimera-chroot /media/root dinitctl --offline enable sshd",
        "chimera-chroot /media/root dinitctl --offline enable dhcpcd",
        "chimera-chroot /media/root dinitctl --offline enable syslog-ng",
    ],
)

server.shell(
    name="Set root password",
    commands=[f"echo '{rootpw}' | chimera-chroot /media/root passwd --stdin root"],
)

server.shell(
    name="Refresh initramfs",
    commands=["chimera-chroot /media/root update-initramfs -c -k all"],
)

server.shell(
    name="Add bootloader",
    commands=[
        "chimera-chroot /media/root apk add grub-i386-pc",
        f"chimera-chroot /media/root grub-install {disk}",
        "chimera-chroot /media/root update-grub",
    ],
)

files.directory(
    name="Create .ssh for root",
    path="/media/root/root/.ssh",
    mode="700",
)

files.line(
    name="Add authorized_key to root",
    path="/media/root/root/.ssh/authorized_keys",
    line=user_ssh_key,
    ensure_newline=True,
)

server.shell(
    name="Add regular user",
    commands=[
        f"chimera-chroot /media/root useradd -m {username}",
        f"chimera-chroot /media/root usermod -a -G wheel {username}",
    ],
)

# NOTE: These assume that {username} gets the uid/gid 1000
files.directory(
    name=f"Create .ssh for {username}",
    path=f"/media/root/home/{username}/.ssh",
    mode="700",
    user="1000",
    group="1000",
)

files.file(
    name=f"Create authorized_keys for {username}",
    path=f"/media/root/home/{username}/.ssh/authorized_keys",
    user="1000",
    group="1000",
)

files.line(
    name=f"Add authorized_key to {username}",
    path=f"/media/root/home/{username}/.ssh/authorized_keys",
    line=user_ssh_key,
    ensure_newline=True,
)


files.line(
    name="Disable SSH password authentication",
    path="/media/root/etc/ssh/sshd_config",
    line="^#PasswordAuthentication .*$",
    replace="PasswordAuthentication no",
)

files.line(
    name="Allow :wheel to use doas",
    path="/media/root/etc/doas.conf",
    line="permit persist :wheel",
    ensure_newline=True,
)