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|
#!/usr/bin/python3
import argparse
import logging
import os
import shutil
import subprocess
import sys
import tempfile
import yaml
PROG = "ambient-build-vm"
DESC = "build virtual machine image with Debian for Ambient"
VERSION = "0.1.0"
CACHE = os.path.expanduser("~/.cache/ambient")
BASE_VMDB = "base.vmdb"
BASE_PLAYBOOK = "playbook.yml"
def parse_args():
p = argparse.ArgumentParser(prog=PROG, description=DESC)
p.add_argument(
"--version", action="version", version=VERSION, help="show version of program"
)
p.add_argument(
"--data",
default=f"/usr/share/{PROG}",
help="look for data files in DATA directory",
)
p.add_argument(
"--cache",
action="store",
help="set cache directory (default is %(default)s)",
default=CACHE,
)
p.add_argument(
"--playbook",
action="append",
help="extra Ansible playbook to use with vmdb to build image (default is none)",
)
p.add_argument(
"--image",
action="store",
help="filename for resulting image (required)",
required=True,
)
p.add_argument(
"--debian",
action="store",
help="install Debian version (codename) instead of the default (%default)",
default="bookworm",
)
return p.parse_args()
def join(args, relative):
return os.path.join(args.data, relative)
def load_yaml(filename):
with open(filename) as f:
return yaml.safe_load(f)
def write_yaml(filename, obj):
with open(filename, "w") as f:
yaml.safe_dump(obj, stream=f, indent=4)
def prepare_build_files(tmp, args):
vmdb_filename = os.path.join(tmp, "image.vmdb")
playbook_filename = os.path.join(tmp, "playbook.yml")
vmdb = load_yaml(join(args, BASE_VMDB))
for step in vmdb["steps"]:
if "debootstrap" in step:
step["debootstrap"] = args.debian
for playbook in args.playbook or []:
vmdb["steps"].append(
{
# note: the value MUST be the root file system tag in the VMDB file
"ansible": "/",
"playbook": playbook,
}
)
shutil.copyfile(playbook, os.path.join(tmp, playbook))
write_yaml(vmdb_filename, vmdb)
shutil.copyfile(join(args, BASE_PLAYBOOK), playbook_filename)
return vmdb_filename
def build_image(tmp, vmdb, tarball, image):
raw = os.path.join(tmp, "image.img")
log = os.path.join(tmp, "log")
# Build image.
logging.info(f"Building RAW image {raw} with vmdb2, using {tarball}")
p = subprocess.run(
["vmdb2", vmdb, "--output", raw, "--rootfs-tarball", tarball, "--log", log],
capture_output=True,
)
if p.returncode != 0:
with open(log, "r") as f:
log = f.read()
sys.stderr.write(f"{log}\nERROR: failed to build image\n")
sys.exit(1)
# Convert built image from raw to QCOW2 format.
logging.info(f"Converting RAW image to {image}")
p = subprocess.run(
["qemu-img", "convert", "-f", "raw", "-O", "qcow2", raw, image],
capture_output=True,
)
if p.returncode != 0:
sys.stderr.write(
f"{p.stderr.decode()}\nERROR: failed to convert image to QCOW2\n"
)
sys.exit(1)
def main():
logging.basicConfig(
level=logging.DEBUG, stream=sys.stdout, format="%(levelname)s %(message)s"
)
logging.info(f"{PROG} {VERSION} starts")
args = parse_args()
tarball = os.path.join(args.cache, "ambient.tar.gz")
tmp = tempfile.mkdtemp()
logging.info("Creating build files")
try:
vmdb = prepare_build_files(tmp, args)
except Exception as e:
sys.stderr.write(f"ERROR: failed to create build files: {e}\n")
shutil.rmtree(tmp)
sys.exit(1)
logging.info(f"Build image {args.image}")
try:
build_image(tmp, vmdb, tarball, args.image)
except Exception as e:
sys.stderr.write(f"ERROR: failed to build image: {e}\n")
shutil.rmtree(tmp)
sys.exit(1)
logging.info("All good")
main()
|
