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docker_publisher.py
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#!/usr/bin/python3
#
# Copyright (c) 2022 SUSE LLC
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# This script's job is to listen for new releases of products with docker images
# and publish those.
import argparse
import json
import os
import re
import requests
import subprocess
import sys
import tempfile
from lxml import etree as xml
import docker_registry
REPOMD_NAMESPACES = {'md': "http://linux.duke.edu/metadata/common",
'repo': "http://linux.duke.edu/metadata/repo",
'rpm': "http://linux.duke.edu/metadata/rpm"}
class DockerImagePublisher:
"""Base class for handling the publishing of docker images.
This handles multiple architectures, which have different layers
and therefore versions."""
def releasedDockerImageVersion(self, arch):
"""This function returns an identifier for the released docker
image's version."""
raise Exception("pure virtual")
def prepareReleasing(self):
"""Prepare the environment to allow calls to releaseDockerImage."""
raise Exception("pure virtual")
def addImage(self, version, arch, image_path):
"""This function adds the docker image with the image manifest, config layers
in image_path."""
raise Exception("pure virtual")
def finishReleasing(self):
"""This function publishes the released layers."""
raise Exception("pure virtual")
class DockerPublishException(Exception):
pass
class DockerImageFetcher:
"""Base class for handling the acquiring of docker images."""
def currentVersion(self):
"""This function returns the version of the latest available version
of the image for the product."""
raise Exception("pure virtual")
def getDockerImage(self, callback):
"""This function downloads the root fs layer and calls callback
with its path as argument."""
raise Exception("pure virtual")
class DockerFetchException(Exception):
pass
class DockerImagePublisherRegistry(DockerImagePublisher):
"""The DockerImagePublisherRegistry class works by using a manifest list to
describe a tag. The list contains a manifest for each architecture.
The manifest will be edited instead of replaced, which means if you don't
call addImage for an architecture, the existing released image stays in place."""
MAP_ARCH_RPM_DOCKER = {'i586': ("386", None),
'x86_64': ("amd64", None),
'armv6l': ("arm", "v6"),
'armv7l': ("arm", "v7"),
'aarch64': ("arm64", "v8"),
'ppc64le': ("ppc64le", None),
's390x': ("s390x", None)}
def __init__(self, dhc, tag, aliases=[]):
"""Construct a DIPR by passing a DockerRegistryClient instance as dhc
and a name for a tag as tag.
Optionally, add tag aliases as aliases. Those will only be written to,
never read."""
self.dhc = dhc
self.tag = tag
self.aliases = aliases
# The manifestlist for the tag is only downloaded if this cache is empty,
# so needs to be set to None to force a redownload.
self.cached_manifestlist = None
# Construct a new manifestlist for the tag.
self.new_manifestlist = None
def getDockerArch(self, arch):
if arch not in self.MAP_ARCH_RPM_DOCKER:
raise DockerPublishException("Unknown arch %s" % arch)
return self.MAP_ARCH_RPM_DOCKER[arch]
def _getManifestlist(self):
if self.cached_manifestlist is None:
self.cached_manifestlist = self.dhc.getManifest(self.tag)
return self.cached_manifestlist
def releasedDockerImageVersion(self, arch):
docker_arch, docker_variant = self.getDockerArch(arch)
manifestlist = self._getManifestlist()
if manifestlist is None:
# No manifest -> force outdated version
return "0"
for manifest in manifestlist['manifests']:
if docker_variant is not None:
if 'variant' not in manifest['platform'] or manifest['platform']['variant'] != docker_variant:
continue
if manifest['platform']['architecture'] == docker_arch:
if 'vnd-opensuse-version' in manifest:
return manifest['vnd-opensuse-version']
# Arch not in the manifest -> force outdated version
return "0"
def prepareReleasing(self):
if self.new_manifestlist is not None:
raise DockerPublishException("Did not finish publishing")
self.new_manifestlist = self._getManifestlist()
# Generate an empty manifestlist
if not self.new_manifestlist:
self.new_manifestlist = {'schemaVersion': 2,
'tag': self.tag,
'mediaType': "application/vnd.docker.distribution.manifest.list.v2+json",
'manifests': []}
return True
def getV2ManifestEntry(self, path, filename, mediaType):
"""For V1 -> V2 schema conversion. filename has to contain the digest"""
digest = filename
if re.match(r"^[a-f0-9]{64}", digest):
digest = "sha256:" + os.path.splitext(digest)[0]
if not digest.startswith("sha256"):
raise DockerPublishException("Invalid manifest contents")
return {'mediaType': mediaType,
'size': os.path.getsize(path + "/" + filename),
'digest': digest,
'x-osdp-filename': filename}
def convertV1ToV2Manifest(self, path, manifest_v1):
"""Converts the v1 manifest in manifest_v1 to a V2 manifest and returns it"""
layers = []
# The order of layers changed in V1 -> V2
for layer_filename in manifest_v1['Layers'][::-1]:
layers += [self.getV2ManifestEntry(path, layer_filename,
"application/vnd.docker.image.rootfs.diff.tar.gzip")]
return {'schemaVersion': 2,
'mediaType': "application/vnd.docker.distribution.manifest.v2+json",
'config': self.getV2ManifestEntry(path, manifest_v1['Config'],
"application/vnd.docker.container.image.v1+json"),
'layers': layers}
def addImage(self, version, arch, image_path):
docker_arch, docker_variant = self.getDockerArch(arch)
manifest = None
with open(image_path + "/manifest.json") as manifest_file:
manifest = json.load(manifest_file)
manifest_v2 = self.convertV1ToV2Manifest(image_path, manifest[0])
# Upload blobs
if not self.dhc.uploadBlob(image_path + "/" + manifest_v2['config']['x-osdp-filename'],
manifest_v2['config']['digest']):
raise DockerPublishException("Could not upload the image config")
for layer in manifest_v2['layers']:
if not self.dhc.uploadBlob(image_path + "/" + layer['x-osdp-filename'],
layer['digest']):
raise DockerPublishException("Could not upload an image layer")
# Upload the manifest
manifest_content = json.dumps(manifest_v2).encode("utf-8")
manifest_digest = self.dhc.uploadManifest(manifest_content)
if manifest_digest is False:
raise DockerPublishException("Could not upload the manifest")
# Register the manifest in the list
replaced = False
for manifest in self.new_manifestlist['manifests']:
if 'variant' in manifest['platform'] and manifest['platform']['variant'] != docker_variant:
continue
if manifest['platform']['architecture'] == docker_arch:
manifest['mediaType'] = manifest_v2['mediaType']
manifest['size'] = len(manifest_content)
manifest['digest'] = manifest_digest
manifest['vnd-opensuse-version'] = version
if docker_variant is not None:
manifest['platform']['variant'] = docker_variant
replaced = True
if not replaced:
# Add it instead
manifest = {'mediaType': manifest_v2['mediaType'],
'size': len(manifest_content),
'digest': manifest_digest,
'vnd-opensuse-version': version,
'platform': {
'architecture': docker_arch,
'os': "linux"}
}
if docker_variant is not None:
manifest['platform']['variant'] = docker_variant
self.new_manifestlist['manifests'] += [manifest]
return True
def finishReleasing(self):
# Generate the manifest content
manifestlist_content = json.dumps(self.new_manifestlist).encode('utf-8')
# Push the aliases
for alias in self.aliases:
if not self.dhc.uploadManifest(manifestlist_content, alias):
raise DockerPublishException("Could not push an manifest list alias")
# Push the new manifest list
if not self.dhc.uploadManifest(manifestlist_content, self.tag):
raise DockerPublishException("Could not upload the new manifest list")
self.new_manifestlist = None
self.cached_manifestlist = None # force redownload
return True
class DockerImageFetcherURL(DockerImageFetcher):
"""A trivial implementation. It downloads a (compressed) tar archive and passes
the decompressed contents to the callback.
The version number can't be determined automatically (it would need to extract
the image and look at /etc/os-release each time - too expensive.) so it
has to be passed manually."""
def __init__(self, version, url):
self.version = version
self.url = url
def currentVersion(self):
return self.version
def getDockerImage(self, callback):
"""Download the tar and extract it"""
with tempfile.NamedTemporaryFile() as tar_file:
tar_file.write(requests.get(self.url).content)
with tempfile.TemporaryDirectory() as tar_dir:
# Extract the .tar.xz into the dir
subprocess.call("tar -xaf '%s' -C '%s'" % (tar_file.name, tar_dir), shell=True)
return callback(tar_dir)
class DockerImageFetcherOBS(DockerImageFetcher):
"""Uses the OBS API to access the build artifacts.
Url has to be https://build.opensuse.org/public/build/<project>/<repo>/<arch>/<pkgname>
If maintenance_release is True, it picks the buildcontainer released last with that name.
e.g. for "foo" it would pick "foo.2019" instead of "foo" or "foo.2018"."""
def __init__(self, url, maintenance_release=False):
self.url = url
self.newest_release_url = None
if not maintenance_release:
self.newest_release_url = url
def _isMaintenanceReleaseOf(self, release, source):
"""Returns whether release describes a maintenance release of source.
E.g. "foo.2019", "foo" -> True, "foo-asdf", "foo" -> False"""
sourcebuildflavor = source.split(":")[1] if ":" in source else None
releasebuildflavor = release.split(":")[1] if ":" in release else None
return sourcebuildflavor == releasebuildflavor and release.startswith(source.split(":")[0] + ".")
def _getNewestReleaseUrl(self):
if self.newest_release_url is None:
buildcontainername = self.url.split("/")[-1]
prjurl = self.url + "/.."
buildcontainerlist_req = requests.get(prjurl)
buildcontainerlist = xml.fromstring(buildcontainerlist_req.content)
releases = [entry for entry in buildcontainerlist.xpath("entry/@name") if
self._isMaintenanceReleaseOf(entry, buildcontainername)]
releases.sort()
# Pick the first one with binaries
for release in releases[::-1] + [buildcontainername]:
self.newest_release_url = prjurl + "/" + release
try:
self._getFilename()
break
except DockerFetchException:
continue
return self.newest_release_url
def _getFilename(self):
"""Return the name of the binary at the URL with the filename ending in
.docker.tar."""
binarylist_req = requests.get(self._getNewestReleaseUrl())
binarylist = xml.fromstring(binarylist_req.content)
for binary in binarylist.xpath("binary/@filename"):
if binary.endswith(".docker.tar"):
return binary
raise DockerFetchException("No docker image built in the repository")
def currentVersion(self):
"""Return {version}-?({flavor}-)Build{build} of the docker file."""
filename = self._getFilename()
# Capture everything between arch and filename suffix
return re.match(r'[^.]*\.[^.]+-(.*)\.docker\.tar$', filename).group(1)
def getDockerImage(self, callback):
"""Download the tar and extract it"""
filename = self._getFilename()
with tempfile.NamedTemporaryFile() as tar_file:
tar_file.write(requests.get(self.newest_release_url + "/" + filename).content)
with tempfile.TemporaryDirectory() as tar_dir:
# Extract the .tar into the dir
subprocess.call("tar -xaf '%s' -C '%s'" % (tar_file.name, tar_dir), shell=True)
return callback(tar_dir)
def run():
drc_tw = docker_registry.DockerRegistryClient(os.environ['REGISTRY'], os.environ['REGISTRY_USER'], os.environ['REGISTRY_PASSWORD'],
os.environ['REGISTRY_REPO_TW'])
drc_leap = docker_registry.DockerRegistryClient(os.environ['REGISTRY'], os.environ['REGISTRY_USER'], os.environ['REGISTRY_PASSWORD'],
os.environ['REGISTRY_REPO_LEAP'])
config = {
'tumbleweed': {
'fetchers': {
'i586': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/i586/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
'x86_64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/x86_64/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
'aarch64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/aarch64/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
'armv7l': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/armv7l/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
'armv6l': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/armv6l/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
'ppc64le': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/ppc64le/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
's390x': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Tumbleweed/containers/s390x/opensuse-tumbleweed-image:docker", maintenance_release=True), # noqa: E501
},
'publisher': DockerImagePublisherRegistry(drc_tw, "latest"),
},
'leap-15.4': {
'fetchers': {
'x86_64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.4/containers/x86_64/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
'aarch64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.4/containers/aarch64/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
'ppc64le': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.4/containers/ppc64le/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
's390x': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.4/containers/s390x/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
},
'publisher': DockerImagePublisherRegistry(drc_leap, "latest", ["15.4", "15"]),
},
'leap-15.5': {
'fetchers': {
'x86_64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.5/containers/x86_64/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
'aarch64': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.5/containers/aarch64/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
'armv7l': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.5/containers_armv7/armv7l/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
'ppc64le': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.5/containers/ppc64le/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
's390x': DockerImageFetcherOBS(url="https://build.opensuse.org/public/build/openSUSE:Containers:Leap:15.5/containers/s390x/opensuse-leap-image:docker", maintenance_release=True), # noqa: E501
},
'publisher': DockerImagePublisherRegistry(drc_leap, "15.5"),
},
}
# Parse args after defining the config - the available distros are included
# in the help output
parser = argparse.ArgumentParser(description="Docker image publish script",
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("distros", metavar="distro", type=str, nargs="*",
default=[key for key in config],
help="Which distros to check for images to publish.")
args = parser.parse_args()
success = True
for distro in args.distros:
print("Handling %s" % distro)
archs_to_update = {}
fetchers = config[distro]['fetchers']
publisher = config[distro]['publisher']
for arch in fetchers:
print("\tArchitecture %s" % arch)
try:
current = fetchers[arch].currentVersion()
print("\t\tAvailable version: %s" % current)
released = publisher.releasedDockerImageVersion(arch)
print("\t\tReleased version: %s" % released)
if current != released:
archs_to_update[arch] = current
except Exception as e:
print("\t\tException during version fetching: %s" % e)
if not archs_to_update:
print("\tNothing to do.")
continue
if not publisher.prepareReleasing():
print("\tCould not prepare the publishing")
success = False
continue
need_to_upload = False
for arch, version in archs_to_update.items():
print("\tUpdating %s image to version %s" % (arch, version))
try:
fetchers[arch].getDockerImage(lambda image_path: publisher.addImage(version=version,
arch=arch,
image_path=image_path))
need_to_upload = True
except DockerFetchException as dfe:
print("\t\tCould not fetch the image: %s" % dfe)
success = False
continue
except DockerPublishException as dpe:
print("\t\tCould not publish the image: %s" % dpe)
success = False
continue
# If nothing got added to the publisher, don't try to upload it.
# For docker hub it'll just update the "last pushed" time without any change
if not need_to_upload:
continue
if not publisher.finishReleasing():
print("\tCould not publish the image")
continue
return 0 if success else 1
if __name__ == "__main__":
sys.exit(run())