1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
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("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["REGISTRIES_CONFIG_PATH"] = 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["REGISTRIES_CONFIG_PATH"], "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("--cni-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)
|
