refactor and support multiple image backends
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333f3614f9
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705BC21EC3C70F34
5
iso/empanadas/empanadas/backends/__init__.py
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5
iso/empanadas/empanadas/backends/__init__.py
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"""Empanadas Backends (fillings)"""
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from .imagefactory import ImageFactoryBackend
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from .kiwi import KiwiBackend
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from .interface import BackendInterface
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313
iso/empanadas/empanadas/backends/imagefactory.py
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313
iso/empanadas/empanadas/backends/imagefactory.py
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"""Backend for ImageFactory"""
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import json
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import os
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import pathlib
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import tempfile
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from .interface import BackendInterface
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from empanadas.builders import utils
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from attrs import define, field
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from typing import List, Optional, Callable, Union
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KICKSTART_PATH = pathlib.Path(os.environ.get("KICKSTART_PATH", "/kickstarts"))
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STORAGE_DIR = pathlib.Path("/var/lib/imagefactory/storage")
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@define(kw_only=True)
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class ImageFactoryBackend(BackendInterface):
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"""Build an image using ImageFactory"""
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kickstart_arg: List[str] = field(factory=list)
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kickstart_path: pathlib.Path = field(init=False)
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base_uuid: Optional[str] = field(default="")
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target_uuid: Optional[str] = field(default="")
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tdl_path: pathlib.Path = field(init=False)
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out_type: str = field(init=False)
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command_args: List[str] = field(factory=list)
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common_args: List[str] = field(factory=list)
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package_args: List[str] = field(factory=list)
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metadata: pathlib.Path = field(init=False)
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ctx = field(init=False)
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stage_commands: Optional[List[List[Union[str, Callable]]]] = field(init=False)
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# The url to use in the path when fetching artifacts for the build
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kickstart_dir: str = field() # 'os' or 'kickstart'
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# The git repository to fetch kickstarts from
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kickstart_repo: str = field()
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def prepare(self):
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self.out_type = self.image_format()
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tdl_template = self.ctx.tmplenv.get_template('icicle/tdl.xml.tmpl')
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self.tdl_path = self.render_icicle_template(tdl_template)
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if not self.tdl_path:
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exit(2)
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self.metadata = pathlib.Path(self.ctx.outdir, ".imagefactory-metadata.json")
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self.kickstart_path = pathlib.Path(f"{KICKSTART_PATH}/Rocky-{self.ctx.architecture.major}-{self.ctx.type_variant}.ks")
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self.checkout_kickstarts()
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self.kickstart_arg = self.kickstart_imagefactory_args()
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try:
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os.mkdir(self.ctx.outdir)
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except FileExistsError:
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self.ctx.log.info("Directory already exists for this release. If possible, previously executed steps may be skipped")
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except Exception as e:
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self.ctx.log.exception("Some other exception occured while creating the output directory", e)
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return 0
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if os.path.exists(self.metadata):
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self.ctx.log.info(f"Found metadata at {self.metadata}")
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with open(self.metadata, "r") as f:
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try:
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o = json.load(f)
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self.base_uuid = o['base_uuid']
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self.target_uuid = o['target_uuid']
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except json.decoder.JSONDecodeError as e:
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self.ctx.log.exception("Couldn't decode metadata file", e)
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finally:
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f.flush()
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self.command_args = self._command_args()
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self.package_args = self._package_args()
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self.common_args = self._common_args()
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self.setup_staging()
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def build(self) -> int:
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if self.base_uuid:
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return 0
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self.fix_ks()
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# TODO(neil): this should be a lambda which is called from the function
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ret, out, err, uuid = self.ctx.prepare_and_run(self.build_command(), search=True)
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if uuid:
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self.base_uuid = uuid.rstrip()
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self.save()
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if ret > 0:
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return ret
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ret = self.package()
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if ret > 0:
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return ret
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ret = self.copy()
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return ret
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def clean(self):
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pass
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def save(self):
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with open(self.metadata, "w") as f:
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try:
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o = {
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name: getattr(self, name) for name in [
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"base_uuid", "target_uuid"
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]
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}
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self.ctx.log.debug(o)
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json.dump(o, f)
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except AttributeError as e:
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self.ctx.log.error("Couldn't find attribute in object. Something is probably wrong", e)
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except Exception as e:
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self.ctx.log.exception(e)
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finally:
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f.flush()
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def package(self) -> int:
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# Some build types don't need to be packaged by imagefactory
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# @TODO remove business logic if possible
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if self.ctx.image_type in ["GenericCloud", "EC2", "Azure", "Vagrant", "OCP", "RPI", "GenericArm"]:
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self.target_uuid = self.base_uuid if hasattr(self, 'base_uuid') else ""
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if self.target_uuid:
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return 0
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ret, out, err, uuid = self.ctx.prepare_and_run(self.package_command(), search=True)
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if uuid:
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self.target_uuid = uuid.rstrip()
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self.save()
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return ret
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def stage(self) -> int:
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""" Stage the artifacst from wherever they are (unpacking and converting if needed)"""
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if not hasattr(self, 'stage_commands'):
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return 0
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returns = []
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for command in self.stage_commands: # type: ignore
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ret, out, err, _ = self.ctx.prepare_and_run(command, search=False)
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returns.append(ret)
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return all(ret > 0 for ret in returns)
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def copy(self, skip=False) -> int:
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# move or unpack if necessary
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self.ctx.log.info("Executing staging commands")
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if (stage := self.stage() > 0):
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raise Exception(stage)
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if not skip:
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self.ctx.log.info("Copying files to output directory")
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ret, out, err, _ = self.ctx.prepare_and_run(self.copy_command(), search=False)
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return ret
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self.ctx.log.info(f"Build complete! Output available in {self.ctx.outdir}/")
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return 0
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def checkout_kickstarts(self) -> int:
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cmd = ["git", "clone", "--branch", f"r{self.ctx.architecture.major}",
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self.kickstart_repo, f"{KICKSTART_PATH}"]
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ret, out, err, _ = self.ctx.prepare_and_run(cmd, search=False)
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self.ctx.log.debug(out)
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self.ctx.log.debug(err)
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if ret > 0:
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ret = self.pull_kickstarts()
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return ret
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def pull_kickstarts(self) -> int:
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cmd: utils.CMD_PARAM_T = ["git", "-C", f"{KICKSTART_PATH}", "reset", "--hard", "HEAD"]
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ret, out, err, _ = self.ctx.prepare_and_run(cmd, search=False)
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self.ctx.log.debug(out)
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self.ctx.log.debug(err)
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if ret == 0:
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cmd = ["git", "-C", f"{KICKSTART_PATH}", "pull"]
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ret, out, err, _ = self.ctx.prepare_and_run(cmd, search=False)
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self.ctx.log.debug(out)
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self.ctx.log.debug(err)
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return ret
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def _command_args(self):
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args_mapping = {
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"debug": "--debug",
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}
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# NOTE(neil): i'm intentionally leaving this as is; deprecated
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return [param for name, param in args_mapping.items() if self.ctx.debug]
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def _package_args(self) -> List[str]:
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if self.ctx.image_type in ["Container"]:
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return ["--parameter", "compress", "xz"]
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return [""]
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def _common_args(self) -> List[str]:
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args = []
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if self.ctx.image_type in ["Container"]:
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args = ["--parameter", "offline_icicle", "true"]
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if self.ctx.image_type in ["GenericCloud", "EC2", "Vagrant", "Azure", "OCP", "RPI", "GenericArm"]:
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args = ["--parameter", "generate_icicle", "false"]
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return args
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def image_format(self) -> str:
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mapping = {
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"Container": "docker"
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}
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return mapping[self.ctx.image_type] if self.ctx.image_type in mapping.keys() else ''
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def kickstart_imagefactory_args(self) -> List[str]:
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if not self.kickstart_path.is_file():
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self.ctx.log.warning(f"Kickstart file is not available: {self.kickstart_path}")
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if not self.ctx.debug:
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self.ctx.log.warning("Exiting because debug mode is not enabled.")
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exit(2)
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return ["--file-parameter", "install_script", str(self.kickstart_path)]
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def render_icicle_template(self, tdl_template) -> pathlib.Path:
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output = tempfile.NamedTemporaryFile(delete=False).name
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return utils.render_template(output, tdl_template,
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architecture=self.ctx.architecture.name,
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iso8601date=self.ctx.build_time.strftime("%Y%m%d"),
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installdir=self.kickstart_dir,
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major=self.ctx.architecture.major,
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minor=self.ctx.architecture.minor,
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release=self.ctx.release,
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size="10G",
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type=self.ctx.image_type,
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utcnow=self.ctx.build_time,
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version_variant=self.ctx.architecture.version if not self.ctx.variant else f"{self.ctx.architecture.version}-{self.ctx.variant}",
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)
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def build_command(self) -> List[str]:
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build_command = ["imagefactory", "--timeout", self.ctx.timeout,
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*self.command_args, "base_image", *self.common_args,
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*self.kickstart_arg, self.tdl_path]
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return build_command
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def package_command(self) -> List[str]:
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package_command = ["imagefactory", *self.command_args, "target_image",
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self.out_type, *self.common_args,
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"--id", f"{self.base_uuid}",
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*self.package_args,
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"--parameter", "repository", self.ctx.outname]
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return package_command
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def copy_command(self) -> List[str]:
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copy_command = ["aws", "s3", "cp", "--recursive", f"{self.ctx.outdir}/",
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f"s3://resf-empanadas/buildimage-{self.ctx.architecture.version}-{self.ctx.architecture.name}/{self.ctx.outname}/{self.ctx.build_time.strftime('%s')}/"
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]
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return copy_command
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def fix_ks(self):
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cmd: utils.CMD_PARAM_T = ["sed", "-i", f"s,$basearch,{self.ctx.architecture.name},", str(self.kickstart_path)]
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self.ctx.prepare_and_run(cmd, search=False)
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def setup_staging(self):
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# Yes, this is gross. I'll fix it later.
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if self.ctx.image_type in ["Container"]:
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self.stage_commands = [
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["tar", "-C", f"{self.ctx.outdir}", "--strip-components=1", "-x", "-f", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", "*/layer.tar"],
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["xz", f"{self.ctx.outdir}/layer.tar"]
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]
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if self.ctx.image_type in ["RPI"]:
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self.stage_commands = [
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["cp", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.ctx.outdir}/{self.ctx.outname}.raw"],
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["xz", f"{self.ctx.outdir}/{self.ctx.outname}.raw"]
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]
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if self.ctx.image_type in ["GenericCloud", "OCP", "GenericArm"]:
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self.stage_commands = [
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["qemu-img", "convert", "-c", "-f", "raw", "-O", "qcow2",
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lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.ctx.outdir}/{self.ctx.outname}.qcow2"]
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]
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if self.ctx.image_type in ["EC2"]:
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self.stage_commands = [
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["qemu-img", "convert", "-f", "raw", "-O", "qcow2", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.ctx.outdir}/{self.ctx.outname}.qcow2"]
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]
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if self.ctx.image_type in ["Azure"]:
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self.stage_commands = [
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["/prep-azure.sh", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{STORAGE_DIR}"],
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["cp", lambda: f"{STORAGE_DIR}/{self.target_uuid}.vhd", f"{self.ctx.outdir}/{self.ctx.outname}.vhd"]
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]
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if self.ctx.image_type in ["Vagrant"]:
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_map = {
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"Vbox": {"format": "vmdk", "provider": "virtualbox"},
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"Libvirt": {"format": "qcow2", "provider": "libvirt", "virtual_size": 10},
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"VMware": {"format": "vmdk", "provider": "vmware_desktop"}
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}
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output = f"{_map[self.ctx.variant]['format']}" # type: ignore
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provider = f"{_map[self.ctx.variant]['provider']}" # type: ignore
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# pop from the options map that will be passed to the vagrant metadata.json
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convert_options = _map[self.ctx.variant].pop('convertOptions') if 'convertOptions' in _map[self.ctx.variant].keys() else '' # type: ignore
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self.stage_commands = [
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["qemu-img", "convert", "-c", "-f", "raw", "-O", output, *convert_options,
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lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.ctx.outdir}/{self.ctx.outname}.{output}"],
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["tar", "-C", self.ctx.outdir, "-czf", f"/tmp/{self.ctx.outname}.box", '.'],
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["mv", f"/tmp/{self.ctx.outname}.box", self.ctx.outdir]
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]
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self.prepare_vagrant(_map[self.ctx.variant])
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if self.stage_commands:
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self.stage_commands.append(["cp", "-v", lambda: f"{STORAGE_DIR}/{self.target_uuid}.meta", f"{self.ctx.outdir}/build.meta"])
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37
iso/empanadas/empanadas/backends/interface.py
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37
iso/empanadas/empanadas/backends/interface.py
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"""
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empanadas backend interface
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"""
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from abc import ABC, abstractmethod
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class BackendInterface(ABC):
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"""
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Interface to build images (or whatever)
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"""
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@abstractmethod
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def prepare(self):
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"""
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Prepares the environment necessary for building the image.
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This might include setting up directories, checking prerequisites, etc.
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"""
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@abstractmethod
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def build(self):
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"""
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Performs the image build operation. This is the core method
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where the actual image building logic is implemented.
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"""
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@abstractmethod
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def stage(self):
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"""
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Transforms and copies artifacts from build directory to the
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location expected by the builder (usually in /tmp/)
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"""
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@abstractmethod
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def clean(self):
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"""
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Cleans up any resources or temporary files created during
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the image building process.
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"""
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16
iso/empanadas/empanadas/backends/kiwi.py
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16
iso/empanadas/empanadas/backends/kiwi.py
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"""Backend for Kiwi"""
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from .interface import BackendInterface
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class KiwiBackend(BackendInterface):
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"""Build an image using Kiwi"""
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def prepare(self):
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pass
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def build(self):
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pass
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def clean(self):
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pass
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1
iso/empanadas/empanadas/builders/__init__.py
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1
iso/empanadas/empanadas/builders/__init__.py
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from .imagebuild import ImageBuild
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106
iso/empanadas/empanadas/builders/imagebuild.py
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106
iso/empanadas/empanadas/builders/imagebuild.py
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"""Build an image with a given backend"""
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import datetime
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import logging
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import pathlib
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from attrs import define, field
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from empanadas.backends import BackendInterface, KiwiBackend
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from empanadas.common import Architecture
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from empanadas.common import _rootdir
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from . import utils
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from jinja2 import Environment, FileSystemLoader, Template
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from typing import List, Optional, Tuple, Callable
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@define(kw_only=True)
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class ImageBuild: # pylint: disable=too-few-public-methods
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"""Image builder using a given backend"""
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tmplenv: Environment = field(init=False)
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# Only things we know we're keeping in this class here
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architecture: Architecture = field()
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backend: BackendInterface = field()
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build_time: datetime.datetime = field()
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debug: bool = field(default=False)
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log: logging.Logger = field()
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release: int = field(default=0)
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timeout: str = field(default='3600')
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image_type: str = field() # the type of the image
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type_variant: str = field(init=False)
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variant: Optional[str] = field()
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# Kubernetes job template
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job_template: Optional[Template] = field(init=False) # the kube Job tpl
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# Commands to stage artifacts
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# Where the artifacts should go to
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outdir: pathlib.Path = field(init=False)
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outname: str = field(init=False)
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def __attrs_post_init__(self):
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self.backend.ctx = self
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file_loader = FileSystemLoader(f"{_rootdir}/templates")
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self.tmplenv = Environment(loader=file_loader)
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self.job_template = self.tmplenv.get_template('kube/Job.tmpl')
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self.type_variant = self.type_variant_name()
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self.outdir, self.outname = self.output_name()
|
||||
|
||||
def output_name(self) -> Tuple[pathlib.Path, str]:
|
||||
directory = f"Rocky-{self.architecture.major}-{self.type_variant}-{self.architecture.version}-{self.build_time.strftime('%Y%m%d')}.{self.release}"
|
||||
name = f"{directory}.{self.architecture.name}"
|
||||
outdir = pathlib.Path("/tmp/", directory)
|
||||
return outdir, name
|
||||
|
||||
def type_variant_name(self):
|
||||
return self.image_type if not self.variant else f"{self.image_type}-{self.variant}"
|
||||
|
||||
def prepare_and_run(self, command: utils.CMD_PARAM_T, search: Callable = None) -> utils.CMD_RESULT_T:
|
||||
return utils.runCmd(self, self.prepare_command(command), search)
|
||||
|
||||
def prepare_command(self, command_list: utils.CMD_PARAM_T) -> List[str]:
|
||||
"""
|
||||
Commands may be a callable, which should be a lambda to be evaluated at
|
||||
preparation time with available locals. This can be used to, among
|
||||
other things, perform lazy evaluations of f-strings which have values
|
||||
not available at assignment time. e.g., filling in a second command
|
||||
with a value extracted from the previous step or command.
|
||||
|
||||
"""
|
||||
|
||||
r = []
|
||||
for c in command_list:
|
||||
if callable(c) and c.__name__ == '<lambda>':
|
||||
r.append(c())
|
||||
else:
|
||||
r.append(str(c))
|
||||
return r
|
||||
|
||||
def render_kubernetes_job(self):
|
||||
# TODO(neil): should this be put in the builder class itself to return the right thing for us?
|
||||
if self.backend == KiwiBackend:
|
||||
self.log.error("Kube not implemented for Kiwi")
|
||||
|
||||
commands = [self.backend.build_command(), self.backend.package_command(), self.backend.copy_command()]
|
||||
if not self.job_template:
|
||||
return None
|
||||
template = self.job_template.render(
|
||||
architecture=self.architecture.name,
|
||||
backoffLimit=4,
|
||||
buildTime=self.build_time.strftime("%s"),
|
||||
command=commands,
|
||||
imageName="ghcr.io/rockylinux/sig-core-toolkit:latest",
|
||||
jobname="buildimage",
|
||||
namespace="empanadas",
|
||||
major=self.architecture.major,
|
||||
minor=self.architecture.minor,
|
||||
restartPolicy="Never",
|
||||
)
|
||||
return template
|
||||
98
iso/empanadas/empanadas/builders/utils.py
Normal file
98
iso/empanadas/empanadas/builders/utils.py
Normal file
@ -0,0 +1,98 @@
|
||||
import pathlib
|
||||
import subprocess
|
||||
|
||||
from functools import partial
|
||||
from typing import Callable, List, Tuple, Union
|
||||
|
||||
CMD_PARAM_T = List[Union[str, Callable[..., str]]]
|
||||
|
||||
STR_NONE_T = Union[bytes, None]
|
||||
BYTES_NONE_T = Union[bytes, None]
|
||||
# Tuple of int, stdout, stderr, uuid
|
||||
CMD_RESULT_T = Tuple[int, BYTES_NONE_T, BYTES_NONE_T, STR_NONE_T]
|
||||
|
||||
|
||||
# def prepare_vagrant(options):
|
||||
# """Setup the output directory for the Vagrant type variant, dropping templates as required"""
|
||||
# file_loader = FileSystemLoader(f"{_rootdir}/templates")
|
||||
# tmplenv = Environment(loader=file_loader)
|
||||
#
|
||||
# templates = {}
|
||||
# templates['Vagrantfile'] = tmplenv.get_template(f"vagrant/Vagrantfile.{self.variant}")
|
||||
# templates['metadata.json'] = tmplenv.get_template('vagrant/metadata.tmpl.json')
|
||||
# templates['info.json'] = tmplenv.get_template('vagrant/info.tmpl.json')
|
||||
#
|
||||
# if self.variant == "VMware":
|
||||
# templates[f"{self.outname}.vmx"] = tmplenv.get_template('vagrant/vmx.tmpl')
|
||||
#
|
||||
# if self.variant == "Vbox":
|
||||
# templates['box.ovf'] = tmplenv.get_template('vagrant/box.tmpl.ovf')
|
||||
#
|
||||
# if self.variant == "Libvirt":
|
||||
# # Libvirt vagrant driver expects the qcow2 file to be called box.img.
|
||||
# qemu_command_index = [i for i, d in enumerate(self.stage_commands) if d[0] == "qemu-img"][0]
|
||||
# self.stage_commands.insert(qemu_command_index+1, ["mv", f"{self.outdir}/{self.outname}.qcow2", f"{self.outdir}/box.img"])
|
||||
#
|
||||
# for name, template in templates.items():
|
||||
# self.render_template(f"{self.outdir}/{name}", template,
|
||||
# name=self.outname,
|
||||
# arch=self.architecture.name,
|
||||
# options=options
|
||||
# )
|
||||
|
||||
|
||||
def render_template(path, template, **kwargs) -> pathlib.Path:
|
||||
with open(path, "wb") as f:
|
||||
_template = template.render(**kwargs)
|
||||
f.write(_template.encode())
|
||||
f.flush()
|
||||
output = pathlib.Path(path)
|
||||
if not output.exists():
|
||||
raise Exception("Failed to template")
|
||||
return output
|
||||
|
||||
|
||||
def runCmd(ctx, prepared_command: List[str], search: Callable = None) -> CMD_RESULT_T:
|
||||
ctx.log.info(f"Running command: {' '.join(prepared_command)}")
|
||||
|
||||
kwargs = {
|
||||
"stderr": subprocess.PIPE,
|
||||
"stdout": subprocess.PIPE
|
||||
}
|
||||
|
||||
if ctx.debug:
|
||||
del kwargs["stderr"]
|
||||
|
||||
with subprocess.Popen(prepared_command, **kwargs) as p:
|
||||
uuid = None
|
||||
# @TODO implement this as a callback?
|
||||
if search:
|
||||
for _, line in enumerate(p.stdout): # type: ignore
|
||||
ln = line.decode()
|
||||
if ln.startswith("UUID: "):
|
||||
uuid = ln.split(" ")[-1]
|
||||
ctx.log.debug(f"found uuid: {uuid}")
|
||||
|
||||
out, err = p.communicate()
|
||||
res = p.wait(), out, err, uuid
|
||||
|
||||
if res[0] > 0:
|
||||
ctx.log.error(f"Problem while executing command: '{prepared_command}'")
|
||||
if search and not res[3]:
|
||||
ctx.log.error("UUID not found in stdout. Dumping stdout and stderr")
|
||||
log_subprocess(ctx, res)
|
||||
|
||||
return res
|
||||
|
||||
|
||||
def log_subprocess(ctx, result: CMD_RESULT_T):
|
||||
def log_lines(title, lines):
|
||||
ctx.log.info(f"====={title}=====")
|
||||
ctx.log.info(lines.decode())
|
||||
ctx.log.info(f"Command return code: {result[0]}")
|
||||
stdout = result[1]
|
||||
stderr = result[2]
|
||||
if stdout:
|
||||
log_lines("Command STDOUT", stdout)
|
||||
if stderr:
|
||||
log_lines("Command STDERR", stderr)
|
||||
@ -1,12 +1,10 @@
|
||||
# All imports are here
|
||||
import glob
|
||||
import hashlib
|
||||
import logging
|
||||
import os
|
||||
import platform
|
||||
import time
|
||||
from collections import defaultdict
|
||||
from typing import Tuple
|
||||
from attrs import define, field
|
||||
|
||||
|
||||
import rpm
|
||||
import yaml
|
||||
@ -120,7 +118,7 @@ ALLOWED_TYPE_VARIANTS = {
|
||||
def valid_type_variant(_type: str, variant: str = "") -> bool:
|
||||
if _type not in ALLOWED_TYPE_VARIANTS:
|
||||
raise Exception(f"Type is invalid: ({_type}, {variant})")
|
||||
if ALLOWED_TYPE_VARIANTS[_type] == None:
|
||||
if ALLOWED_TYPE_VARIANTS[_type] is None:
|
||||
if variant is not None:
|
||||
raise Exception(f"{_type} Type expects no variant type.")
|
||||
return True
|
||||
@ -135,8 +133,6 @@ def valid_type_variant(_type: str, variant: str = "") -> bool:
|
||||
return True
|
||||
|
||||
|
||||
from attrs import define, field
|
||||
|
||||
|
||||
@define(kw_only=True)
|
||||
class Architecture:
|
||||
|
||||
@ -1,44 +1,43 @@
|
||||
# Builds an image given a version, type, variant, and architecture
|
||||
# Builds an image given a version, type, variant, anctx.d architecture
|
||||
# Defaults to the running host's architecture
|
||||
|
||||
import argparse
|
||||
import datetime
|
||||
import json
|
||||
import logging
|
||||
import os
|
||||
import pathlib
|
||||
import platform
|
||||
import subprocess
|
||||
import sys
|
||||
import tempfile
|
||||
import time
|
||||
|
||||
from attrs import define, Factory, field, asdict
|
||||
from botocore import args
|
||||
from jinja2 import Environment, FileSystemLoader, Template
|
||||
from typing import Callable, List, NoReturn, Optional, Tuple, IO, Union
|
||||
|
||||
from empanadas.common import Architecture, rldict, valid_type_variant
|
||||
from empanadas.common import _rootdir
|
||||
from empanadas.builders import ImageBuild
|
||||
from empanadas.backends import ImageFactoryBackend # , KiwiBackend
|
||||
|
||||
parser = argparse.ArgumentParser(description="ISO Compose")
|
||||
|
||||
parser.add_argument('--version', type=str, help="Release Version (8.6, 9.1)", required=True)
|
||||
parser.add_argument('--version',
|
||||
type=str, help="Release Version (8.6, 9.1)", required=True)
|
||||
parser.add_argument('--rc', action='store_true', help="Release Candidate")
|
||||
parser.add_argument('--kickstartdir', action='store_true', help="Use the kickstart dir instead of the os dir for repositories")
|
||||
parser.add_argument('--kickstartdir', action='store_true',
|
||||
help="Use the kickstart dir instead of the os dir")
|
||||
parser.add_argument('--debug', action='store_true', help="debug?")
|
||||
parser.add_argument('--type', type=str, help="Image type (container, genclo, azure, aws, vagrant)", required=True)
|
||||
parser.add_argument('--type', type=str,
|
||||
help="Image type (container, genclo, azure, aws, vagrant)",
|
||||
required=True)
|
||||
parser.add_argument('--variant', type=str, help="", required=False)
|
||||
parser.add_argument('--release', type=str, help="Image release for subsequent builds with the same date stamp (rarely needed)", required=False)
|
||||
parser.add_argument('--kube', action='store_true', help="output as a K8s job(s)", required=False)
|
||||
parser.add_argument('--timeout', type=str, help="change timeout for imagefactory build process (default 3600)", required=False, default='3600')
|
||||
parser.add_argument('--release', type=str,
|
||||
help="Image release for builds with the same date stamp",
|
||||
required=False)
|
||||
parser.add_argument('--kube', action='store_true',
|
||||
help="output as a K8s job(s)",
|
||||
required=False)
|
||||
parser.add_argument('--timeout', type=str,
|
||||
help="change timeout for imagefactory build process",
|
||||
required=False, default='3600')
|
||||
|
||||
|
||||
results = parser.parse_args()
|
||||
rlvars = rldict[results.version]
|
||||
major = rlvars["major"]
|
||||
|
||||
|
||||
debug = results.debug
|
||||
|
||||
log = logging.getLogger(__name__)
|
||||
@ -52,405 +51,6 @@ formatter = logging.Formatter(
|
||||
handler.setFormatter(formatter)
|
||||
log.addHandler(handler)
|
||||
|
||||
STORAGE_DIR = pathlib.Path("/var/lib/imagefactory/storage")
|
||||
KICKSTART_PATH = pathlib.Path(os.environ.get("KICKSTART_PATH", "/kickstarts"))
|
||||
BUILDTIME = datetime.datetime.utcnow()
|
||||
|
||||
|
||||
CMD_PARAM_T = List[Union[str, Callable[..., str]]]
|
||||
|
||||
@define(kw_only=True)
|
||||
class ImageBuild:
|
||||
architecture: Architecture = field()
|
||||
base_uuid: Optional[str] = field(default="")
|
||||
cli_args: argparse.Namespace = field()
|
||||
command_args: List[str] = field(factory=list)
|
||||
common_args: List[str] = field(factory=list)
|
||||
debug: bool = field(default=False)
|
||||
image_type: str = field()
|
||||
job_template: Optional[Template] = field(init=False)
|
||||
kickstart_arg: List[str] = field(factory=list)
|
||||
kickstart_path: pathlib.Path = field(init=False)
|
||||
metadata: pathlib.Path = field(init=False)
|
||||
out_type: str = field(init=False)
|
||||
outdir: pathlib.Path = field(init=False)
|
||||
outname: str = field(init=False)
|
||||
package_args: List[str] = field(factory=list)
|
||||
release: int = field(default=0)
|
||||
stage_commands: Optional[List[List[Union[str,Callable]]]] = field(init=False)
|
||||
target_uuid: Optional[str] = field(default="")
|
||||
tdl_path: pathlib.Path = field(init=False)
|
||||
template: Template = field()
|
||||
timeout: str = field(default='3600')
|
||||
type_variant: str = field(init=False)
|
||||
variant: Optional[str] = field()
|
||||
|
||||
def __attrs_post_init__(self):
|
||||
self.tdl_path = self.render_icicle_template()
|
||||
if not self.tdl_path:
|
||||
exit(2)
|
||||
self.type_variant = self.type_variant_name()
|
||||
self.outdir, self.outname = self.output_name()
|
||||
self.out_type = self.image_format()
|
||||
self.command_args = self._command_args()
|
||||
self.package_args = self._package_args()
|
||||
self.common_args = self._common_args()
|
||||
|
||||
self.metadata = pathlib.Path(self.outdir, ".imagefactory-metadata.json")
|
||||
|
||||
self.kickstart_path = pathlib.Path(f"{KICKSTART_PATH}/Rocky-{self.architecture.major}-{self.type_variant}.ks")
|
||||
|
||||
self.checkout_kickstarts()
|
||||
self.kickstart_arg = self.kickstart_imagefactory_args()
|
||||
|
||||
try:
|
||||
os.mkdir(self.outdir)
|
||||
except FileExistsError as e:
|
||||
log.info("Directory already exists for this release. If possible, previously executed steps may be skipped")
|
||||
except Exception as e:
|
||||
log.exception("Some other exception occured while creating the output directory", e)
|
||||
return 0
|
||||
|
||||
if os.path.exists(self.metadata):
|
||||
with open(self.metadata, "r") as f:
|
||||
try:
|
||||
o = json.load(f)
|
||||
self.base_uuid = o['base_uuid']
|
||||
self.target_uuid = o['target_uuid']
|
||||
except json.decoder.JSONDecodeError as e:
|
||||
log.exception("Couldn't decode metadata file", e)
|
||||
finally:
|
||||
f.flush()
|
||||
|
||||
# Yes, this is gross. I'll fix it later.
|
||||
if self.image_type in ["Container"]:
|
||||
self.stage_commands = [
|
||||
["tar", "-C", f"{self.outdir}", "--strip-components=1", "-x", "-f", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", "*/layer.tar"],
|
||||
["xz", f"{self.outdir}/layer.tar"]
|
||||
]
|
||||
if self.image_type in ["RPI"]:
|
||||
self.stage_commands = [
|
||||
["cp", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.outdir}/{self.outname}.raw"],
|
||||
["xz", f"{self.outdir}/{self.outname}.raw"]
|
||||
]
|
||||
if self.image_type in ["GenericCloud", "OCP", "GenericArm"]:
|
||||
self.stage_commands = [
|
||||
["qemu-img", "convert", "-c", "-f", "raw", "-O", "qcow2", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.outdir}/{self.outname}.qcow2"]
|
||||
]
|
||||
if self.image_type in ["EC2"]:
|
||||
self.stage_commands = [
|
||||
["qemu-img", "convert", "-f", "raw", "-O", "qcow2", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.outdir}/{self.outname}.qcow2"]
|
||||
]
|
||||
if self.image_type in ["Azure"]:
|
||||
self.stage_commands = [
|
||||
["/prep-azure.sh", lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{STORAGE_DIR}"],
|
||||
["cp", lambda: f"{STORAGE_DIR}/{self.target_uuid}.vhd", f"{self.outdir}/{self.outname}.vhd"]
|
||||
]
|
||||
if self.image_type in ["Vagrant"]:
|
||||
_map = {
|
||||
"Vbox": {"format": "vmdk", "provider": "virtualbox"},
|
||||
"Libvirt": {"format": "qcow2", "provider": "libvirt", "virtual_size": 10},
|
||||
"VMware": {"format": "vmdk", "provider": "vmware_desktop"}
|
||||
}
|
||||
output = f"{_map[self.variant]['format']}" #type: ignore
|
||||
provider = f"{_map[self.variant]['provider']}" # type: ignore
|
||||
|
||||
# pop from the options map that will be passed to the vagrant metadata.json
|
||||
convert_options = _map[self.variant].pop('convertOptions') if 'convertOptions' in _map[self.variant].keys() else '' #type: ignore
|
||||
|
||||
|
||||
self.stage_commands = [
|
||||
["qemu-img", "convert", "-c", "-f", "raw", "-O", output, *convert_options, lambda: f"{STORAGE_DIR}/{self.target_uuid}.body", f"{self.outdir}/{self.outname}.{output}"],
|
||||
["tar", "-C", self.outdir, "-czf", f"/tmp/{self.outname}.box", '.'],
|
||||
["mv", f"/tmp/{self.outname}.box", self.outdir]
|
||||
]
|
||||
self.prepare_vagrant(_map[self.variant])
|
||||
|
||||
if self.stage_commands:
|
||||
self.stage_commands.append(["cp", "-v", lambda: f"{STORAGE_DIR}/{self.target_uuid}.meta", f"{self.outdir}/build.meta"])
|
||||
|
||||
|
||||
def prepare_vagrant(self, options):
|
||||
"""Setup the output directory for the Vagrant type variant, dropping templates as required"""
|
||||
file_loader = FileSystemLoader(f"{_rootdir}/templates")
|
||||
tmplenv = Environment(loader=file_loader)
|
||||
|
||||
templates = {}
|
||||
templates['Vagrantfile'] = tmplenv.get_template(f"vagrant/Vagrantfile.{self.variant}")
|
||||
templates['metadata.json'] = tmplenv.get_template('vagrant/metadata.tmpl.json')
|
||||
templates['info.json'] = tmplenv.get_template('vagrant/info.tmpl.json')
|
||||
|
||||
if self.variant == "VMware":
|
||||
templates[f"{self.outname}.vmx"] = tmplenv.get_template('vagrant/vmx.tmpl')
|
||||
|
||||
if self.variant == "Vbox":
|
||||
templates['box.ovf'] = tmplenv.get_template('vagrant/box.tmpl.ovf')
|
||||
|
||||
if self.variant == "Libvirt":
|
||||
# Libvirt vagrant driver expects the qcow2 file to be called box.img.
|
||||
qemu_command_index = [i for i, d in enumerate(self.stage_commands) if d[0] == "qemu-img"][0]
|
||||
self.stage_commands.insert(qemu_command_index+1, ["mv", f"{self.outdir}/{self.outname}.qcow2", f"{self.outdir}/box.img"])
|
||||
|
||||
for name, template in templates.items():
|
||||
self.render_template(f"{self.outdir}/{name}", template,
|
||||
name=self.outname,
|
||||
arch=self.architecture.name,
|
||||
options=options
|
||||
)
|
||||
|
||||
def checkout_kickstarts(self) -> int:
|
||||
cmd = ["git", "clone", "--branch", f"r{self.architecture.major}", rlvars['livemap']['git_repo'], f"{KICKSTART_PATH}"]
|
||||
ret, out, err, _ = self.runCmd(cmd, search=False)
|
||||
log.debug(out)
|
||||
log.debug(err)
|
||||
if ret > 0:
|
||||
ret = self.pull_kickstarts()
|
||||
return ret
|
||||
|
||||
def pull_kickstarts(self) -> int:
|
||||
cmd: CMD_PARAM_T = ["git", "-C", f"{KICKSTART_PATH}", "reset", "--hard", "HEAD"]
|
||||
ret, out, err, _ = self.runCmd(cmd, search=False)
|
||||
log.debug(out)
|
||||
log.debug(err)
|
||||
if ret == 0:
|
||||
cmd = ["git", "-C", f"{KICKSTART_PATH}", "pull"]
|
||||
ret, out, err, _ = self.runCmd(cmd, search=False)
|
||||
log.debug(out)
|
||||
log.debug(err)
|
||||
return ret
|
||||
|
||||
|
||||
def output_name(self) -> Tuple[pathlib.Path, str]:
|
||||
directory = f"Rocky-{self.architecture.major}-{self.type_variant}-{self.architecture.version}-{BUILDTIME.strftime('%Y%m%d')}.{self.release}"
|
||||
name = f"{directory}.{self.architecture.name}"
|
||||
outdir = pathlib.Path(f"/tmp/", directory)
|
||||
return outdir, name
|
||||
|
||||
def type_variant_name(self):
|
||||
return self.image_type if not self.variant else f"{self.image_type}-{self.variant}"
|
||||
|
||||
def _command_args(self):
|
||||
args_mapping = {
|
||||
"debug": "--debug",
|
||||
}
|
||||
return [param for name, param in args_mapping.items() if getattr(self.cli_args, name)]
|
||||
|
||||
def _package_args(self) -> List[str]:
|
||||
if self.image_type in ["Container"]:
|
||||
return ["--parameter", "compress", "xz"]
|
||||
return [""]
|
||||
|
||||
def _common_args(self) -> List[str]:
|
||||
args = []
|
||||
if self.image_type in ["Container"]:
|
||||
args = ["--parameter", "offline_icicle", "true"]
|
||||
if self.image_type in ["GenericCloud", "EC2", "Vagrant", "Azure", "OCP", "RPI", "GenericArm"]:
|
||||
args = ["--parameter", "generate_icicle", "false"]
|
||||
return args
|
||||
|
||||
def image_format(self) -> str:
|
||||
mapping = {
|
||||
"Container": "docker"
|
||||
}
|
||||
return mapping[self.image_type] if self.image_type in mapping.keys() else ''
|
||||
|
||||
def kickstart_imagefactory_args(self) -> List[str]:
|
||||
|
||||
if not self.kickstart_path.is_file():
|
||||
log.warning(f"Kickstart file is not available: {self.kickstart_path}")
|
||||
if not debug:
|
||||
log.warning("Exiting because debug mode is not enabled.")
|
||||
exit(2)
|
||||
|
||||
return ["--file-parameter", "install_script", str(self.kickstart_path)]
|
||||
|
||||
def render_template(self, path, template, **kwargs) -> pathlib.Path:
|
||||
with open(path, "wb") as f:
|
||||
_template = template.render(**kwargs)
|
||||
f.write(_template.encode())
|
||||
f.flush()
|
||||
output = pathlib.Path(path)
|
||||
if not output.exists():
|
||||
log.error("Failed to write template")
|
||||
raise Exception("Failed to template")
|
||||
return output
|
||||
|
||||
def render_icicle_template(self) -> pathlib.Path:
|
||||
output = tempfile.NamedTemporaryFile(delete=False).name
|
||||
return self.render_template(output, self.template,
|
||||
architecture=self.architecture.name,
|
||||
iso8601date=BUILDTIME.strftime("%Y%m%d"),
|
||||
installdir="kickstart" if self.cli_args.kickstartdir else "os",
|
||||
major=self.architecture.major,
|
||||
minor=self.architecture.minor,
|
||||
release=self.release,
|
||||
size="10G",
|
||||
type=self.image_type,
|
||||
utcnow=BUILDTIME,
|
||||
version_variant=self.architecture.version if not self.variant else f"{self.architecture.version}-{self.variant}",
|
||||
)
|
||||
|
||||
def build_command(self) -> List[str]:
|
||||
build_command = ["imagefactory", "--timeout", self.timeout, *self.command_args, "base_image", *self.common_args, *self.kickstart_arg, self.tdl_path]
|
||||
return build_command
|
||||
def package_command(self) -> List[str]:
|
||||
package_command = ["imagefactory", *self.command_args, "target_image", self.out_type, *self.common_args,
|
||||
"--id", f"{self.base_uuid}",
|
||||
*self.package_args,
|
||||
"--parameter", "repository", self.outname,
|
||||
]
|
||||
return package_command
|
||||
|
||||
def copy_command(self) -> List[str]:
|
||||
|
||||
copy_command = ["aws", "s3", "cp", "--recursive", f"{self.outdir}/",
|
||||
f"s3://resf-empanadas/buildimage-{self.architecture.version}-{self.architecture.name}/{ self.outname }/{ BUILDTIME.strftime('%s') }/"
|
||||
]
|
||||
|
||||
return copy_command
|
||||
|
||||
def build(self) -> int:
|
||||
if self.base_uuid:
|
||||
return 0
|
||||
|
||||
self.fix_ks()
|
||||
|
||||
ret, out, err, uuid = self.runCmd(self.build_command())
|
||||
if uuid:
|
||||
self.base_uuid = uuid.rstrip()
|
||||
self.save()
|
||||
return ret
|
||||
|
||||
def package(self) -> int:
|
||||
# Some build types don't need to be packaged by imagefactory
|
||||
# @TODO remove business logic if possible
|
||||
if self.image_type in ["GenericCloud", "EC2", "Azure", "Vagrant", "OCP", "RPI", "GenericArm"]:
|
||||
self.target_uuid = self.base_uuid if hasattr(self, 'base_uuid') else ""
|
||||
|
||||
if self.target_uuid:
|
||||
return 0
|
||||
|
||||
ret, out, err, uuid = self.runCmd(self.package_command())
|
||||
if uuid:
|
||||
self.target_uuid = uuid.rstrip()
|
||||
self.save()
|
||||
return ret
|
||||
|
||||
def stage(self) -> int:
|
||||
""" Stage the artifacst from wherever they are (unpacking and converting if needed)"""
|
||||
if not hasattr(self,'stage_commands'):
|
||||
return 0
|
||||
|
||||
returns = []
|
||||
for command in self.stage_commands: #type: ignore
|
||||
ret, out, err, _ = self.runCmd(command, search=False)
|
||||
returns.append(ret)
|
||||
|
||||
return all(ret > 0 for ret in returns)
|
||||
|
||||
def copy(self, skip=False) -> int:
|
||||
# move or unpack if necessary
|
||||
log.info("Executing staging commands")
|
||||
if (stage := self.stage() > 0):
|
||||
raise Exception(stage)
|
||||
|
||||
if not skip:
|
||||
log.info("Copying files to output directory")
|
||||
ret, out, err, _ = self.runCmd(self.copy_command(), search=False)
|
||||
return ret
|
||||
|
||||
log.info(f"Build complete! Output available in {self.outdir}/")
|
||||
return 0
|
||||
|
||||
def runCmd(self, command: CMD_PARAM_T, search: bool = True) -> Tuple[int, Union[bytes,None], Union[bytes,None], Union[str,None]]:
|
||||
prepared, _ = self.prepare_command(command)
|
||||
log.info(f"Running command: {' '.join(prepared)}")
|
||||
|
||||
kwargs = {
|
||||
"stderr": subprocess.PIPE,
|
||||
"stdout": subprocess.PIPE
|
||||
}
|
||||
if debug: del kwargs["stderr"]
|
||||
|
||||
with subprocess.Popen(prepared, **kwargs) as p:
|
||||
uuid = None
|
||||
# @TODO implement this as a callback?
|
||||
if search:
|
||||
for _, line in enumerate(p.stdout): # type: ignore
|
||||
ln = line.decode()
|
||||
if ln.startswith("UUID: "):
|
||||
uuid = ln.split(" ")[-1]
|
||||
log.debug(f"found uuid: {uuid}")
|
||||
|
||||
out, err = p.communicate()
|
||||
res = p.wait(), out, err, uuid
|
||||
|
||||
if res[0] > 0:
|
||||
log.error(f"Problem while executing command: '{prepared}'")
|
||||
if search and not res[3]:
|
||||
log.error("UUID not found in stdout. Dumping stdout and stderr")
|
||||
self.log_subprocess(res)
|
||||
|
||||
return res
|
||||
|
||||
def prepare_command(self, command_list: CMD_PARAM_T) -> Tuple[List[str],List[None]]:
|
||||
"""
|
||||
Commands may be a callable, which should be a lambda to be evaluated at
|
||||
preparation time with available locals. This can be used to, among
|
||||
other things, perform lazy evaluations of f-strings which have values
|
||||
not available at assignment time. e.g., filling in a second command
|
||||
with a value extracted from the previous step or command.
|
||||
|
||||
"""
|
||||
|
||||
r = []
|
||||
return r, [r.append(c()) if (callable(c) and c.__name__ == '<lambda>') else r.append(str(c)) for c in command_list]
|
||||
|
||||
def log_subprocess(self, result: Tuple[int, Union[bytes, None], Union[bytes, None], Union[str, None]]):
|
||||
def log_lines(title, lines):
|
||||
log.info(f"====={title}=====")
|
||||
log.info(lines.decode())
|
||||
log.info(f"Command return code: {result[0]}")
|
||||
stdout = result[1]
|
||||
stderr = result[2]
|
||||
if stdout:
|
||||
log_lines("Command STDOUT", stdout)
|
||||
if stderr:
|
||||
log_lines("Command STDERR", stderr)
|
||||
|
||||
def fix_ks(self):
|
||||
cmd: CMD_PARAM_T = ["sed", "-i", f"s,$basearch,{self.architecture.name},", str(self.kickstart_path)]
|
||||
self.runCmd(cmd, search=False)
|
||||
|
||||
def render_kubernetes_job(self):
|
||||
commands = [self.build_command(), self.package_command(), self.copy_command()]
|
||||
if not self.job_template:
|
||||
return None
|
||||
template = self.job_template.render(
|
||||
architecture=self.architecture.name,
|
||||
backoffLimit=4,
|
||||
buildTime=BUILDTIME.strftime("%s"),
|
||||
command=commands,
|
||||
imageName="ghcr.io/rockylinux/sig-core-toolkit:latest",
|
||||
jobname="buildimage",
|
||||
namespace="empanadas",
|
||||
major=major,
|
||||
restartPolicy="Never",
|
||||
)
|
||||
return template
|
||||
|
||||
def save(self):
|
||||
with open(self.metadata, "w") as f:
|
||||
try:
|
||||
o = { name: getattr(self, name) for name in ["base_uuid", "target_uuid"] }
|
||||
log.debug(o)
|
||||
json.dump(o, f)
|
||||
except AttributeError as e:
|
||||
log.error("Couldn't find attribute in object. Something is probably wrong", e)
|
||||
except Exception as e:
|
||||
log.exception(e)
|
||||
finally:
|
||||
f.flush()
|
||||
|
||||
def run():
|
||||
try:
|
||||
@ -459,28 +59,29 @@ def run():
|
||||
log.exception(e)
|
||||
exit(2)
|
||||
|
||||
file_loader = FileSystemLoader(f"{_rootdir}/templates")
|
||||
tmplenv = Environment(loader=file_loader)
|
||||
tdl_template = tmplenv.get_template('icicle/tdl.xml.tmpl')
|
||||
|
||||
arches = rlvars['allowed_arches'] if results.kube else [platform.uname().machine]
|
||||
|
||||
for architecture in arches:
|
||||
backend = ImageFactoryBackend(
|
||||
kickstart_dir="kickstart" if results.kickstartdir else "os",
|
||||
kickstart_repo=rlvars['livemap']['git_repo']
|
||||
)
|
||||
IB = ImageBuild(
|
||||
architecture=Architecture.from_version(architecture, rlvars['revision']),
|
||||
cli_args=results,
|
||||
debug=results.debug,
|
||||
image_type=results.type,
|
||||
image_type=results.type,
|
||||
release=results.release if results.release else 0,
|
||||
template=tdl_template,
|
||||
variant=results.variant,
|
||||
build_time=datetime.datetime.utcnow(),
|
||||
backend=backend,
|
||||
log=log,
|
||||
)
|
||||
if results.kube:
|
||||
IB.job_template = tmplenv.get_template('kube/Job.tmpl')
|
||||
#commands = IB.kube_commands()
|
||||
print(IB.render_kubernetes_job())
|
||||
else:
|
||||
ret = IB.build()
|
||||
ret = IB.package()
|
||||
ret = IB.copy()
|
||||
|
||||
if results.kube:
|
||||
# commands = IB.kube_commands()
|
||||
print(IB.render_kubernetes_job())
|
||||
sys.exit(0)
|
||||
|
||||
IB.backend.prepare()
|
||||
IB.backend.build()
|
||||
IB.backend.clean()
|
||||
|
||||
@ -21,6 +21,7 @@ GitPython = ">=3.1.30"
|
||||
|
||||
[tool.poetry.dev-dependencies]
|
||||
pytest = "~5"
|
||||
attrs = "^23.1.0"
|
||||
|
||||
[tool.poetry.scripts]
|
||||
test-module = "empanadas.scripts.test_module:run"
|
||||
@ -39,6 +40,16 @@ generate-compose = "empanadas.scripts.generate_compose:run"
|
||||
peridot-repoclosure = "empanadas.scripts.peridot_repoclosure:run"
|
||||
refresh-all-treeinfo = "empanadas.scripts.refresh_all_treeinfo:run"
|
||||
|
||||
[tool.pylint.main]
|
||||
init-hook ="""
|
||||
try:
|
||||
import pylint_venv
|
||||
except ImportError:
|
||||
pass
|
||||
else:
|
||||
pylint_venv.inithook()
|
||||
"""
|
||||
|
||||
[build-system]
|
||||
requires = ["poetry-core>=1.0.0"]
|
||||
build-backend = "poetry.core.masonry.api"
|
||||
|
||||
2
iso/empanadas/tox.ini
Normal file
2
iso/empanadas/tox.ini
Normal file
@ -0,0 +1,2 @@
|
||||
[pycodestyle]
|
||||
max-line-length = 160
|
||||
Loading…
Reference in New Issue
Block a user