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import configparser
import json
import os
import pathlib
import shutil
import subprocess
import tempfile
from docker import DockerClient
from .compat import constant
class Podman(object):
"""
Instances hold the configuration and setup for running podman commands
"""
def __init__(self):
"""Initialize a Podman instance with global options"""
binary = os.getenv("PODMAN", "bin/podman")
self.cmd = [binary, "--storage-driver=vfs"]
cgroupfs = os.getenv("CGROUP_MANAGER", "systemd")
self.cmd.append(f"--cgroup-manager={cgroupfs}")
# No support for tmpfs (/tmp) or extfs (/var/tmp)
# self.cmd.append("--storage-driver=overlay")
if os.getenv("PODMAN_PYTHON_TEST_DEBUG"):
self.cmd.append("--log-level=debug")
self.cmd.append("--syslog=true")
self.anchor_directory = tempfile.mkdtemp(prefix="podman_docker_")
self.image_cache = os.path.join(self.anchor_directory, "cache")
os.makedirs(self.image_cache, exist_ok=True)
self.cmd.append("--root=" + os.path.join(self.anchor_directory, "crio"))
self.cmd.append("--runroot=" + os.path.join(self.anchor_directory, "crio-run"))
os.environ["CONTAINERS_REGISTRIES_CONF"] = os.path.join(
self.anchor_directory, "registry.conf"
)
p = configparser.ConfigParser()
p.read_dict(
{
"registries.search": {"registries": "['quay.io', 'docker.io']"},
"registries.insecure": {"registries": "[]"},
"registries.block": {"registries": "[]"},
}
)
with open(os.environ["CONTAINERS_REGISTRIES_CONF"], "w") as w:
p.write(w)
os.environ["CNI_CONFIG_PATH"] = os.path.join(
self.anchor_directory, "cni", "net.d"
)
os.makedirs(os.environ["CNI_CONFIG_PATH"], exist_ok=True)
self.cmd.append("--network-config-dir=" + os.environ["CNI_CONFIG_PATH"])
cni_cfg = os.path.join(
os.environ["CNI_CONFIG_PATH"], "87-podman-bridge.conflist"
)
# json decoded and encoded to ensure legal json
buf = json.loads(
"""
{
"cniVersion": "0.3.0",
"name": "default",
"plugins": [{
"type": "bridge",
"bridge": "cni0",
"isGateway": true,
"ipMasq": true,
"ipam": {
"type": "host-local",
"subnet": "10.88.0.0/16",
"routes": [{
"dst": "0.0.0.0/0"
}]
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
"""
)
with open(cni_cfg, "w") as w:
json.dump(buf, w)
def open(self, command, *args, **kwargs):
"""Podman initialized instance to run a given command
:param self: Podman instance
:param command: podman sub-command to run
:param args: arguments and options for command
:param kwargs: See subprocess.Popen() for shell keyword
:return: subprocess.Popen() instance configured to run podman instance
"""
cmd = self.cmd.copy()
cmd.append(command)
cmd.extend(args)
shell = kwargs.get("shell", False)
return subprocess.Popen(
cmd,
shell=shell,
stdin=subprocess.DEVNULL,
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
)
def run(self, command, *args, **kwargs):
"""Podman initialized instance to run a given command
:param self: Podman instance
:param command: podman sub-command to run
:param args: arguments and options for command
:param kwargs: See subprocess.Popen() for shell and check keywords
:return: subprocess.Popen() instance configured to run podman instance
"""
cmd = self.cmd.copy()
cmd.append(command)
cmd.extend(args)
check = kwargs.get("check", False)
shell = kwargs.get("shell", False)
return subprocess.run(
cmd,
shell=shell,
check=check,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
def tear_down(self):
shutil.rmtree(self.anchor_directory, ignore_errors=True)
def restore_image_from_cache(self, client: DockerClient):
path = os.path.join(self.image_cache, constant.ALPINE_TARBALL)
if not os.path.exists(path):
img = client.images.pull(constant.ALPINE)
with open(path, mode="wb") as tarball:
for frame in img.save(named=True):
tarball.write(frame)
else:
self.run("load", "-i", path, check=True)
def flush_image_cache(self):
for f in pathlib.Path(self.image_cache).glob("*.tar"):
f.unlink(f)
|
