buildbot-nix/buildbot_nix/__init__.py
2023-11-18 07:02:34 +01:00

858 lines
28 KiB
Python

#!/usr/bin/env python3
import json
import multiprocessing
import os
import signal
import sys
import uuid
from collections import defaultdict
from collections.abc import Generator
from dataclasses import dataclass
from pathlib import Path
from typing import Any
from buildbot.configurators import ConfiguratorBase
from buildbot.plugins import reporters, schedulers, secrets, steps, util, worker
from buildbot.process import buildstep, logobserver, remotecommand
from buildbot.process.log import Log
from buildbot.process.project import Project
from buildbot.process.properties import Interpolate, Properties
from buildbot.process.results import ALL_RESULTS, statusToString
from buildbot.steps.trigger import Trigger
from twisted.internet import defer, threads
from twisted.python.failure import Failure
from .github_projects import ( # noqa: E402
GithubProject,
create_project_hook,
load_projects,
refresh_projects,
slugify_project_name,
)
class BuildTrigger(Trigger):
"""
Dynamic trigger that creates a build for every attribute.
"""
def __init__(
self, scheduler: str, jobs: list[dict[str, Any]], **kwargs: Any
) -> None:
if "name" not in kwargs:
kwargs["name"] = "trigger"
self.jobs = jobs
self.config = None
Trigger.__init__(
self,
waitForFinish=True,
schedulerNames=[scheduler],
haltOnFailure=True,
flunkOnFailure=True,
sourceStamps=[],
alwaysUseLatest=False,
updateSourceStamp=False,
**kwargs,
)
def createTriggerProperties(self, props: Any) -> Any: # noqa: N802
return props
def getSchedulersAndProperties(self) -> list[tuple[str, Properties]]: # noqa: N802
build_props = self.build.getProperties()
repo_name = build_props.getProperty(
"github.base.repo.full_name",
build_props.getProperty("github.repository.full_name"),
)
project_id = slugify_project_name(repo_name)
source = f"nix-eval-{project_id}"
sch = self.schedulerNames[0]
triggered_schedulers = []
for job in self.jobs:
attr = job.get("attr", "eval-error")
name = attr
if repo_name is not None:
name = f"github:{repo_name}#checks.{name}"
else:
name = f"checks.{name}"
drv_path = job.get("drvPath")
error = job.get("error")
system = job.get("system")
out_path = job.get("outputs", {}).get("out")
build_props.setProperty(f"{attr}-out_path", out_path, source)
build_props.setProperty(f"{attr}-drv_path", drv_path, source)
props = Properties()
props.setProperty("virtual_builder_name", name, source)
props.setProperty("status_name", f"nix-build .#checks.{attr}", source)
props.setProperty("virtual_builder_tags", "", source)
props.setProperty("attr", attr, source)
props.setProperty("system", system, source)
props.setProperty("drv_path", drv_path, source)
props.setProperty("out_path", out_path, source)
# we use this to identify builds when running a retry
props.setProperty("build_uuid", str(uuid.uuid4()), source)
props.setProperty("error", error, source)
props.setProperty("is_cached", job.get("isCached"), source)
triggered_schedulers.append((sch, props))
return triggered_schedulers
def getCurrentSummary(self) -> dict[str, str]: # noqa: N802
"""
The original build trigger will the generic builder name `nix-build` in this case, which is not helpful
"""
if not self.triggeredNames:
return {"step": "running"}
summary = []
if self._result_list:
for status in ALL_RESULTS:
count = self._result_list.count(status)
if count:
summary.append(
f"{self._result_list.count(status)} {statusToString(status, count)}"
)
return {"step": f"({', '.join(summary)})"}
class NixEvalCommand(buildstep.ShellMixin, steps.BuildStep):
"""
Parses the output of `nix-eval-jobs` and triggers a `nix-build` build for
every attribute.
"""
def __init__(self, supported_systems: list[str], **kwargs: Any) -> None:
kwargs = self.setupShellMixin(kwargs)
super().__init__(**kwargs)
self.observer = logobserver.BufferLogObserver()
self.addLogObserver("stdio", self.observer)
self.supported_systems = supported_systems
@defer.inlineCallbacks
def run(self) -> Generator[Any, object, Any]:
# run nix-eval-jobs --flake .#checks to generate the dict of stages
cmd: remotecommand.RemoteCommand = yield self.makeRemoteShellCommand()
yield self.runCommand(cmd)
# if the command passes extract the list of stages
result = cmd.results()
if result == util.SUCCESS:
# create a ShellCommand for each stage and add them to the build
jobs = []
for line in self.observer.getStdout().split("\n"):
if line != "":
try:
job = json.loads(line)
except json.JSONDecodeError as e:
raise Exception(f"Failed to parse line: {line}") from e
jobs.append(job)
build_props = self.build.getProperties()
repo_name = build_props.getProperty(
"github.base.repo.full_name",
build_props.getProperty("github.repository.full_name"),
)
project_id = slugify_project_name(repo_name)
scheduler = f"{project_id}-nix-build"
filtered_jobs = []
for job in jobs:
system = job.get("system")
if not system: # report eval errors
filtered_jobs.append(job)
elif system in self.supported_systems:
filtered_jobs.append(job)
self.build.addStepsAfterCurrentStep(
[
BuildTrigger(
scheduler=scheduler, name="build flake", jobs=filtered_jobs
)
]
)
return result
# FIXME this leaks memory... but probably not enough that we care
class RetryCounter:
def __init__(self, retries: int) -> None:
self.builds: dict[uuid.UUID, int] = defaultdict(lambda: retries)
def retry_build(self, id: uuid.UUID) -> int:
retries = self.builds[id]
if retries > 1:
self.builds[id] = retries - 1
return retries
else:
return 0
# For now we limit this to two. Often this allows us to make the error log
# shorter because we won't see the logs for all previous succeeded builds
RETRY_COUNTER = RetryCounter(retries=2)
class NixBuildCommand(buildstep.ShellMixin, steps.BuildStep):
"""
Builds a nix derivation if evaluation was successful,
otherwise this shows the evaluation error.
"""
def __init__(self, **kwargs: Any) -> None:
kwargs = self.setupShellMixin(kwargs)
super().__init__(**kwargs)
self.observer = logobserver.BufferLogObserver()
self.addLogObserver("stdio", self.observer)
@defer.inlineCallbacks
def run(self) -> Generator[Any, object, Any]:
error = self.getProperty("error")
if error is not None:
attr = self.getProperty("attr")
# show eval error
self.build.results = util.FAILURE
error_log: Log = yield self.addLog("nix_error")
error_log.addStderr(f"{attr} failed to evaluate:\n{error}")
return util.FAILURE
cached = self.getProperty("is_cached")
if cached:
log: Log = yield self.addLog("log")
log.addStderr("Build is already the binary cache.")
return util.SKIPPED
# run `nix build`
cmd: remotecommand.RemoteCommand = yield self.makeRemoteShellCommand()
yield self.runCommand(cmd)
res = cmd.results()
if res == util.FAILURE:
retries = RETRY_COUNTER.retry_build(self.getProperty("build_uuid"))
if retries > 0:
return util.RETRY
return res
class UpdateBuildOutput(steps.BuildStep):
"""
Updates store paths in a public www directory.
This is useful to prefetch updates without having to evaluate
on the target machine.
"""
def __init__(self, path: Path, **kwargs: Any) -> None:
super().__init__(**kwargs)
self.path = path
def run(self) -> Generator[Any, object, Any]:
props = self.build.getProperties()
if props.getProperty("branch") != props.getProperty(
"github.repository.default_branch"
):
return util.SKIPPED
cached = props.getProperty("is_cached")
if cached:
return util.SKIPPED
attr = os.path.basename(props.getProperty("attr"))
out_path = props.getProperty("out_path")
# XXX don't hardcode this
self.path.mkdir(parents=True, exist_ok=True)
(self.path / attr).write_text(out_path)
return util.SUCCESS
class ReloadGithubProjects(steps.BuildStep):
name = "reload_github_projects"
def __init__(self, token: str, project_cache_file: Path, **kwargs: Any) -> None:
self.token = token
self.project_cache_file = project_cache_file
super().__init__(**kwargs)
def reload_projects(self) -> None:
refresh_projects(self.token, self.project_cache_file)
@defer.inlineCallbacks
def run(self) -> Generator[Any, object, Any]:
d = threads.deferToThread(self.reload_projects)
self.error_msg = ""
def error_cb(failure: Failure) -> int:
self.error_msg += failure.getTraceback()
return util.FAILURE
d.addCallbacks(lambda _: util.SUCCESS, error_cb)
res = yield d
if res == util.SUCCESS:
# reload the buildbot config
os.kill(os.getpid(), signal.SIGHUP)
return util.SUCCESS
else:
log: Log = yield self.addLog("log")
log.addStderr(f"Failed to reload project list: {self.error_msg}")
return util.FAILURE
def reload_github_projects(
worker_names: list[str],
github_token_secret: str,
project_cache_file: Path,
) -> util.BuilderConfig:
"""
Updates the flake an opens a PR for it.
"""
factory = util.BuildFactory()
factory.addStep(
ReloadGithubProjects(github_token_secret, project_cache_file=project_cache_file)
)
return util.BuilderConfig(
name="reload-github-projects",
workernames=worker_names,
factory=factory,
)
def nix_update_flake_config(
project: GithubProject,
worker_names: list[str],
github_token_secret: str,
github_bot_user: str,
) -> util.BuilderConfig:
"""
Updates the flake an opens a PR for it.
"""
factory = util.BuildFactory()
url_with_secret = util.Interpolate(
f"https://git:%(secret:{github_token_secret})s@github.com/%(prop:project)s"
)
factory.addStep(
steps.Git(
repourl=url_with_secret,
alwaysUseLatest=True,
method="clean",
submodules=True,
haltOnFailure=True,
)
)
factory.addStep(
steps.ShellCommand(
name="Update flakes",
env=dict(
GIT_AUTHOR_NAME=github_bot_user,
GIT_AUTHOR_EMAIL=f"{github_bot_user}@users.noreply.github.com",
GIT_COMMITTER_NAME=github_bot_user,
GIT_COMMITTER_EMAIL=f"{github_bot_user}@users.noreply.github.com",
),
command=[
"nix",
"flake",
"update",
"--commit-lock-file",
"--commit-lockfile-summary",
"flake.lock: Update",
],
haltOnFailure=True,
)
)
factory.addStep(
steps.ShellCommand(
name="Force-Push to update_flake_lock branch",
command=[
"git",
"push",
"--force",
"origin",
"HEAD:refs/heads/update_flake_lock",
],
haltOnFailure=True,
)
)
factory.addStep(
steps.SetPropertyFromCommand(
env=dict(GITHUB_TOKEN=util.Secret(github_token_secret)),
command=[
"gh",
"pr",
"view",
"--json",
"state",
"--template",
"{{.state}}",
"update_flake_lock",
],
decodeRC={0: "SUCCESS", 1: "SUCCESS"},
property="has_pr",
)
)
factory.addStep(
steps.ShellCommand(
name="Create pull-request",
env=dict(GITHUB_TOKEN=util.Secret(github_token_secret)),
command=[
"gh",
"pr",
"create",
"--repo",
project.name,
"--title",
"flake.lock: Update",
"--body",
"Automatic buildbot update",
"--head",
"refs/heads/update_flake_lock",
"--base",
project.default_branch,
],
doStepIf=lambda s: s.getProperty("has_pr") != "OPEN",
)
)
return util.BuilderConfig(
name=f"{project.name}/update-flake",
project=project.name,
workernames=worker_names,
factory=factory,
)
def nix_eval_config(
project: GithubProject,
worker_names: list[str],
github_token_secret: str,
supported_systems: list[str],
eval_lock: util.WorkerLock,
worker_count: int,
max_memory_size: int,
) -> util.BuilderConfig:
"""
Uses nix-eval-jobs to evaluate hydraJobs from flake.nix in parallel.
For each evaluated attribute a new build pipeline is started.
"""
factory = util.BuildFactory()
# check out the source
url_with_secret = util.Interpolate(
f"https://git:%(secret:{github_token_secret})s@github.com/%(prop:project)s"
)
factory.addStep(
steps.Git(
repourl=url_with_secret,
method="clean",
submodules=True,
haltOnFailure=True,
)
)
factory.addStep(
NixEvalCommand(
env={},
name="evaluate flake",
supported_systems=supported_systems,
command=[
"nix-eval-jobs",
"--workers",
str(worker_count),
"--max-memory-size",
str(max_memory_size),
"--option",
"accept-flake-config",
"true",
"--gc-roots-dir",
# FIXME: don't hardcode this
"/var/lib/buildbot-worker/gcroot",
"--force-recurse",
"--check-cache-status",
"--flake",
".#checks",
],
haltOnFailure=True,
locks=[eval_lock.access("exclusive")],
)
)
return util.BuilderConfig(
name=f"{project.name}/nix-eval",
workernames=worker_names,
project=project.name,
factory=factory,
properties=dict(status_name="nix-eval"),
)
def nix_build_config(
project: GithubProject,
worker_names: list[str],
has_cachix_auth_token: bool = False,
has_cachix_signing_key: bool = False,
outputs_path: Path | None = None,
) -> util.BuilderConfig:
"""
Builds one nix flake attribute.
"""
factory = util.BuildFactory()
factory.addStep(
NixBuildCommand(
env={},
name="Build flake attr",
command=[
"nix",
"build",
"-L",
"--option",
"keep-going",
"true",
"--accept-flake-config",
"--out-link",
util.Interpolate("result-%(prop:attr)s"),
util.Interpolate("%(prop:drv_path)s^*"),
],
haltOnFailure=True,
)
)
if has_cachix_auth_token or has_cachix_signing_key:
if has_cachix_signing_key:
env = dict(CACHIX_SIGNING_KEY=util.Secret("cachix-signing-key"))
else:
env = dict(CACHIX_AUTH_TOKEN=util.Secret("cachix-auth-token"))
factory.addStep(
steps.ShellCommand(
name="Upload cachix",
env=env,
command=[
"cachix",
"push",
util.Secret("cachix-name"),
util.Interpolate("result-%(prop:attr)s"),
],
doStepIf=lambda s: not s.getProperty("is_cached"),
)
)
factory.addStep(
steps.ShellCommand(
name="Register gcroot",
command=[
"nix-store",
"--add-root",
# FIXME: cleanup old build attributes
util.Interpolate(
"/nix/var/nix/gcroots/per-user/buildbot-worker/%(prop:project)s/%(prop:attr)s"
),
"-r",
util.Property("out_path"),
],
doStepIf=lambda s: not s.getProperty("is_cached")
and s.getProperty("branch")
== s.getProperty("github.repository.default_branch"),
)
)
factory.addStep(
steps.ShellCommand(
name="Delete temporary gcroots",
command=["rm", "-f", util.Interpolate("result-%(prop:attr)s")],
doStepIf=lambda s: not s.getProperty("is_cached"),
)
)
if outputs_path is not None:
factory.addStep(
UpdateBuildOutput(
name="Update build output",
path=outputs_path,
)
)
return util.BuilderConfig(
name=f"{project.name}/nix-build",
project=project.name,
workernames=worker_names,
collapseRequests=False,
env={},
factory=factory,
)
def read_secret_file(secret_name: str) -> str:
directory = os.environ.get("CREDENTIALS_DIRECTORY")
if directory is None:
print("directory not set", file=sys.stderr)
sys.exit(1)
return Path(directory).joinpath(secret_name).read_text().rstrip()
@dataclass
class GithubConfig:
oauth_id: str
admins: list[str]
buildbot_user: str
oauth_secret_name: str = "github-oauth-secret"
webhook_secret_name: str = "github-webhook-secret"
token_secret_name: str = "github-token"
project_cache_file: Path = Path("github-project-cache.json")
topic: str | None = "build-with-buildbot"
def token(self) -> str:
return read_secret_file(self.token_secret_name)
def config_for_project(
config: dict[str, Any],
project: GithubProject,
credentials: str,
worker_names: list[str],
github: GithubConfig,
nix_supported_systems: list[str],
nix_eval_worker_count: int,
nix_eval_max_memory_size: int,
eval_lock: util.WorkerLock,
outputs_path: Path | None = None,
) -> Project:
## get a deterministic jitter for the project
# random.seed(project.name)
## don't run all projects at the same time
# jitter = random.randint(1, 60) * 60
config["projects"].append(Project(project.name))
config["schedulers"].extend(
[
schedulers.SingleBranchScheduler(
name=f"{project.id}-default-branch",
change_filter=util.ChangeFilter(
repository=project.url,
filter_fn=lambda c: c.branch
== c.properties.getProperty("github.repository.default_branch"),
),
builderNames=[f"{project.name}/nix-eval"],
treeStableTimer=5,
),
# this is compatible with bors or github's merge queue
schedulers.SingleBranchScheduler(
name=f"{project.id}-merge-queue",
change_filter=util.ChangeFilter(
repository=project.url,
branch_re="(gh-readonly-queue/.*|staging|trying)",
),
builderNames=[f"{project.name}/nix-eval"],
),
# build all pull requests
schedulers.SingleBranchScheduler(
name=f"{project.id}-prs",
change_filter=util.ChangeFilter(
repository=project.url, category="pull"
),
builderNames=[f"{project.name}/nix-eval"],
),
# this is triggered from `nix-eval`
schedulers.Triggerable(
name=f"{project.id}-nix-build",
builderNames=[f"{project.name}/nix-build"],
),
# allow to manually trigger a nix-build
schedulers.ForceScheduler(
name=f"{project.id}-force",
builderNames=[f"{project.name}/nix-eval"],
properties=[
util.StringParameter(
name="project",
label="Name of the GitHub repository.",
default=project.name,
)
],
),
# allow to manually update flakes
schedulers.ForceScheduler(
name=f"{project.id}-update-flake",
builderNames=[f"{project.name}/update-flake"],
buttonName="Update flakes",
properties=[
util.StringParameter(
name="project",
label="Name of the GitHub repository.",
default=project.name,
)
],
),
# updates flakes once a week
# schedulers.Periodic(
# name=f"{project.id}-update-flake-weekly",
# builderNames=[f"{project.name}/update-flake"],
# periodicBuildTimer=24 * 60 * 60 * 7 + jitter,
# ),
]
)
has_cachix_auth_token = os.path.isfile(
os.path.join(credentials, "cachix-auth-token")
)
has_cachix_signing_key = os.path.isfile(
os.path.join(credentials, "cachix-signing-key")
)
config["builders"].extend(
[
# Since all workers run on the same machine, we only assign one of them to do the evaluation.
# This should prevent exessive memory usage.
nix_eval_config(
project,
[worker_names[0]],
github_token_secret=github.token_secret_name,
supported_systems=nix_supported_systems,
worker_count=nix_eval_worker_count,
max_memory_size=nix_eval_max_memory_size,
eval_lock=eval_lock,
),
nix_build_config(
project,
worker_names,
has_cachix_auth_token,
has_cachix_signing_key,
outputs_path=outputs_path,
),
nix_update_flake_config(
project,
worker_names,
github_token_secret=github.token_secret_name,
github_bot_user=github.buildbot_user,
),
]
)
class NixConfigurator(ConfiguratorBase):
"""Janitor is a configurator which create a Janitor Builder with all needed Janitor steps"""
def __init__(
self,
# Shape of this file:
# [ { "name": "<worker-name>", "pass": "<worker-password>", "cores": "<cpu-cores>" } ]
github: GithubConfig,
url: str,
nix_supported_systems: list[str],
nix_eval_worker_count: int | None,
nix_eval_max_memory_size: int,
nix_workers_secret_name: str = "buildbot-nix-workers",
outputs_path: str | None = None,
) -> None:
super().__init__()
self.nix_workers_secret_name = nix_workers_secret_name
self.nix_eval_max_memory_size = nix_eval_max_memory_size
self.nix_eval_worker_count = nix_eval_worker_count
self.nix_supported_systems = nix_supported_systems
self.github = github
self.url = url
self.systemd_credentials_dir = os.environ["CREDENTIALS_DIRECTORY"]
if outputs_path is None:
self.outputs_path = None
else:
self.outputs_path = Path(outputs_path)
def configure(self, config: dict[str, Any]) -> None:
projects = load_projects(self.github.token(), self.github.project_cache_file)
if self.github.topic is not None:
projects = [p for p in projects if self.github.topic in p.topics]
worker_config = json.loads(read_secret_file(self.nix_workers_secret_name))
worker_names = []
config.setdefault("projects", [])
config.setdefault("secretsProviders", [])
config.setdefault("www", {})
for item in worker_config:
cores = item.get("cores", 0)
for i in range(cores):
worker_name = f"{item['name']}-{i:03}"
config["workers"].append(worker.Worker(worker_name, item["pass"]))
worker_names.append(worker_name)
webhook_secret = read_secret_file(self.github.webhook_secret_name)
eval_lock = util.WorkerLock("nix-eval")
for project in projects:
create_project_hook(
project.owner,
project.repo,
self.github.token(),
self.url + "change_hook/github",
webhook_secret,
)
for project in projects:
config_for_project(
config,
project,
self.systemd_credentials_dir,
worker_names,
self.github,
self.nix_supported_systems,
self.nix_eval_worker_count or multiprocessing.cpu_count(),
self.nix_eval_max_memory_size,
eval_lock,
self.outputs_path,
)
# Reload github projects
config["builders"].append(
reload_github_projects(
[worker_names[0]],
self.github.token(),
self.github.project_cache_file,
)
)
config["schedulers"].extend(
[
schedulers.ForceScheduler(
name="reload-github-projects",
builderNames=["reload-github-projects"],
buttonName="Update projects",
),
# project list twice a day
schedulers.Periodic(
name="reload-github-projects-bidaily",
builderNames=["reload-github-projects"],
periodicBuildTimer=12 * 60 * 60,
),
]
)
config["services"].append(
reporters.GitHubStatusPush(
token=self.github.token(),
# Since we dynamically create build steps,
# we use `virtual_builder_name` in the webinterface
# so that we distinguish what has beeing build
context=Interpolate("buildbot/%(prop:status_name)s"),
)
)
systemd_secrets = secrets.SecretInAFile(
dirname=os.environ["CREDENTIALS_DIRECTORY"]
)
config["secretsProviders"].append(systemd_secrets)
config["www"]["change_hook_dialects"] = config["www"].get(
"change_hook_dialects", {}
)
config["www"]["change_hook_dialects"]["github"] = {
"secret": webhook_secret,
"strict": True,
"token": self.github.token(),
"github_property_whitelist": "*",
}
if not config["www"].get("auth"):
config["www"]["avatar_methods"] = config["www"].get("avatar_methods", [])
config["www"]["avatar_methods"].append(
util.AvatarGitHub(token=self.github.token())
)
config["www"]["auth"] = util.GitHubAuth(
self.github.oauth_id, read_secret_file(self.github.oauth_secret_name)
)
config["www"]["authz"] = util.Authz(
roleMatchers=[
util.RolesFromUsername(
roles=["admin"], usernames=self.github.admins
)
],
allowRules=[
util.AnyEndpointMatcher(role="admin", defaultDeny=False),
util.AnyControlEndpointMatcher(role="admins"),
],
)