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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
import hashlib
import json
import os
import re
import sys
from collections.abc import Mapping
from urllib.parse import quote, urlencode, urlunparse
import requests
import requests_unixsocket
from mozbuild.util import memoize
from mozpack.archive import create_tar_gz_from_files
from mozpack.files import GeneratedFile
from taskgraph.util.yaml import load_yaml
from .. import GECKO
IMAGE_DIR = os.path.join(GECKO, "taskcluster", "docker")
def docker_url(path, **kwargs):
docker_socket = os.environ.get("DOCKER_SOCKET", "/var/run/docker.sock")
return urlunparse(
("http+unix", quote(docker_socket, safe=""), path, "", urlencode(kwargs), "")
)
def post_to_docker(tar, api_path, **kwargs):
"""POSTs a tar file to a given docker API path.
The tar argument can be anything that can be passed to requests.post()
as data (e.g. iterator or file object).
The extra keyword arguments are passed as arguments to the docker API.
"""
# requests-unixsocket doesn't honor requests timeouts
# We have some large docker images that trigger the default timeout,
# so we increase the requests-unixsocket timeout here.
session = requests.Session()
session.mount(
requests_unixsocket.DEFAULT_SCHEME,
requests_unixsocket.UnixAdapter(timeout=120),
)
req = session.post(
docker_url(api_path, **kwargs),
data=tar,
stream=True,
headers={"Content-Type": "application/x-tar"},
)
if req.status_code != 200:
message = req.json().get("message")
if not message:
message = f"docker API returned HTTP code {req.status_code}"
raise Exception(message)
status_line = {}
buf = b""
for content in req.iter_content(chunk_size=None):
if not content:
continue
# Sometimes, a chunk of content is not a complete json, so we cumulate
# with leftovers from previous iterations.
buf += content
try:
data = json.loads(buf)
except Exception:
continue
buf = b""
# data is sometimes an empty dict.
if not data:
continue
# Mimick how docker itself presents the output. This code was tested
# with API version 1.18 and 1.26.
if "status" in data:
if "id" in data:
if sys.stderr.isatty():
total_lines = len(status_line)
line = status_line.setdefault(data["id"], total_lines)
n = total_lines - line
if n > 0:
# Move the cursor up n lines.
sys.stderr.write(f"\033[{n}A")
# Clear line and move the cursor to the beginning of it.
sys.stderr.write("\033[2K\r")
sys.stderr.write(
"{}: {} {}\n".format(
data["id"], data["status"], data.get("progress", "")
)
)
if n > 1:
# Move the cursor down n - 1 lines, which, considering
# the carriage return on the last write, gets us back
# where we started.
sys.stderr.write(f"\033[{n - 1}B")
else:
status = status_line.get(data["id"])
# Only print status changes.
if status != data["status"]:
sys.stderr.write("{}: {}\n".format(data["id"], data["status"]))
status_line[data["id"]] = data["status"]
else:
status_line = {}
sys.stderr.write("{}\n".format(data["status"]))
elif "stream" in data:
sys.stderr.write(data["stream"])
elif "aux" in data:
sys.stderr.write(repr(data["aux"]))
elif "error" in data:
sys.stderr.write("{}\n".format(data["error"]))
# Sadly, docker doesn't give more than a plain string for errors,
# so the best we can do to propagate the error code from the command
# that failed is to parse the error message...
errcode = 1
m = re.search(r"returned a non-zero code: (\d+)", data["error"])
if m:
errcode = int(m.group(1))
sys.exit(errcode)
else:
raise NotImplementedError(repr(data))
sys.stderr.flush()
def docker_image(name, by_tag=False):
"""
Resolve in-tree prebuilt docker image to ``<registry>/<repository>@sha256:<digest>``,
or ``<registry>/<repository>:<tag>`` if `by_tag` is `True`.
"""
try:
with open(os.path.join(IMAGE_DIR, name, "REGISTRY")) as f:
registry = f.read().strip()
except OSError:
with open(os.path.join(IMAGE_DIR, "REGISTRY")) as f:
registry = f.read().strip()
if not by_tag:
hashfile = os.path.join(IMAGE_DIR, name, "HASH")
try:
with open(hashfile) as f:
return f"{registry}/{name}@{f.read().strip()}"
except OSError:
raise Exception(f"Failed to read HASH file {hashfile}")
try:
with open(os.path.join(IMAGE_DIR, name, "VERSION")) as f:
tag = f.read().strip()
except OSError:
tag = "latest"
return f"{registry}/{name}:{tag}"
class VoidWriter:
"""A file object with write capabilities that does nothing with the written
data."""
def write(self, buf):
pass
def generate_context_hash(topsrcdir, image_path, image_name, args):
"""Generates a sha256 hash for context directory used to build an image."""
return stream_context_tar(
topsrcdir, image_path, VoidWriter(), image_name, args=args
)
class HashingWriter:
"""A file object with write capabilities that hashes the written data at
the same time it passes down to a real file object."""
def __init__(self, writer):
self._hash = hashlib.sha256()
self._writer = writer
def write(self, buf):
self._hash.update(buf)
self._writer.write(buf)
def hexdigest(self):
return self._hash.hexdigest()
def create_context_tar(topsrcdir, context_dir, out_path, image_name, args):
"""Create a context tarball.
A directory ``context_dir`` containing a Dockerfile will be assembled into
a gzipped tar file at ``out_path``.
We also scan the source Dockerfile for special syntax that influences
context generation.
If a line in the Dockerfile has the form ``# %include <path>``,
the relative path specified on that line will be matched against
files in the source repository and added to the context under the
path ``topsrcdir/``. If an entry is a directory, we add all files
under that directory.
Returns the SHA-256 hex digest of the created archive.
"""
with open(out_path, "wb") as fh:
return stream_context_tar(
topsrcdir,
context_dir,
fh,
image_name=image_name,
args=args,
)
def stream_context_tar(topsrcdir, context_dir, out_file, image_name, args):
"""Like create_context_tar, but streams the tar file to the `out_file` file
object."""
archive_files = {}
content = []
context_dir = os.path.join(topsrcdir, context_dir)
for root, dirs, files in os.walk(context_dir):
for f in files:
source_path = os.path.join(root, f)
archive_path = source_path[len(context_dir) + 1 :]
archive_files[archive_path] = source_path
# Parse Dockerfile for special syntax of extra files to include.
with open(os.path.join(context_dir, "Dockerfile"), "r") as fh:
for line in fh:
content.append(line)
if not line.startswith("# %include"):
continue
p = line[len("# %include ") :].strip()
if os.path.isabs(p):
raise Exception("extra include path cannot be absolute: %s" % p)
fs_path = os.path.normpath(os.path.join(topsrcdir, p))
# Check for filesystem traversal exploits.
if not fs_path.startswith(topsrcdir):
raise Exception("extra include path outside topsrcdir: %s" % p)
if not os.path.exists(fs_path):
raise Exception("extra include path does not exist: %s" % p)
if os.path.isdir(fs_path):
for root, dirs, files in os.walk(fs_path):
for f in files:
source_path = os.path.join(root, f)
rel = source_path[len(fs_path) + 1 :]
archive_path = os.path.join("topsrcdir", p, rel)
archive_files[archive_path] = source_path
else:
archive_path = os.path.join("topsrcdir", p)
archive_files[archive_path] = fs_path
archive_files["Dockerfile"] = GeneratedFile("".join(content).encode("utf-8"))
writer = HashingWriter(out_file)
create_tar_gz_from_files(writer, archive_files, f"{image_name}.tar")
return writer.hexdigest()
class ImagePathsMap(Mapping):
"""ImagePathsMap contains the mapping of Docker image names to their
context location in the filesystem. The register function allows Thunderbird
to define additional images under comm/taskcluster.
"""
def __init__(self, config_path, image_dir=IMAGE_DIR):
config = load_yaml(GECKO, config_path)
self.__update_image_paths(config["jobs"], image_dir)
def __getitem__(self, key):
return self.__dict__[key]
def __iter__(self):
return iter(self.__dict__)
def __len__(self):
return len(self.__dict__)
def __update_image_paths(self, jobs, image_dir):
self.__dict__.update(
{
k: os.path.join(image_dir, v.get("definition", k))
for k, v in jobs.items()
}
)
def register(self, jobs_config_path, image_dir):
"""Register additional image_paths. In this case, there is no 'jobs'
key in the loaded YAML as this file is loaded via jobs-from in kind.yml."""
jobs = load_yaml(GECKO, jobs_config_path)
self.__update_image_paths(jobs, image_dir)
image_paths = ImagePathsMap("taskcluster/kinds/docker-image/kind.yml")
def image_path(name):
if name in image_paths:
return image_paths[name]
return os.path.join(IMAGE_DIR, name)
@memoize
def parse_volumes(image):
"""Parse VOLUME entries from a Dockerfile for an image."""
volumes = set()
path = image_path(image)
with open(os.path.join(path, "Dockerfile"), "rb") as fh:
for line in fh:
line = line.strip()
# We assume VOLUME definitions don't use ARGS.
if not line.startswith(b"VOLUME "):
continue
v = line.split(None, 1)[1]
if v.startswith(b"["):
raise ValueError(
"cannot parse array syntax for VOLUME; "
"convert to multiple entries"
)
volumes |= {v.decode("utf-8") for v in v.split()}
return volumes