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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import re
import grp
import sys
import time
import subprocess
import psutil
import vyos.defaults
def read_file(path):
""" Read a file to string """
with open(path, 'r') as f:
data = f.read().strip()
return data
def colon_separated_to_dict(data_string, uniquekeys=False):
""" Converts a string containing newline-separated entries
of colon-separated key-value pairs into a dict.
Such files are common in Linux /proc filesystem
Args:
data_string (str): data string
uniquekeys (bool): whether to insist that keys are unique or not
Returns: dict
Raises:
ValueError: if uniquekeys=True and the data string has
duplicate keys.
Note:
If uniquekeys=True, then dict entries are always strings,
otherwise they are always lists of strings.
"""
key_value_re = re.compile('([^:]+)\s*\:\s*(.*)')
data_raw = re.split('\n', data_string)
data = {}
for l in data_raw:
l = l.strip()
if l:
match = re.match(key_value_re, l)
if match:
key = match.groups()[0].strip()
value = match.groups()[1].strip()
if key in data.keys():
if uniquekeys:
raise ValueError("Data string has duplicate keys: {0}".format(key))
else:
data[key].append(value)
else:
if uniquekeys:
data[key] = value
else:
data[key] = [value]
else:
pass
return data
def process_running(pid_file):
""" Checks if a process with PID in pid_file is running """
with open(pid_file, 'r') as f:
pid = f.read().strip()
return psutil.pid_exists(int(pid))
def seconds_to_human(s, separator=""):
""" Converts number of seconds passed to a human-readable
interval such as 1w4d18h35m59s
"""
s = int(s)
week = 60 * 60 * 24 * 7
day = 60 * 60 * 24
hour = 60 * 60
remainder = 0
result = ""
weeks = s // week
if weeks > 0:
result = "{0}w".format(weeks)
s = s % week
days = s // day
if days > 0:
result = "{0}{1}{2}d".format(result, separator, days)
s = s % day
hours = s // hour
if hours > 0:
result = "{0}{1}{2}h".format(result, separator, hours)
s = s % hour
minutes = s // 60
if minutes > 0:
result = "{0}{1}{2}m".format(result, separator, minutes)
s = s % 60
seconds = s
if seconds > 0:
result = "{0}{1}{2}s".format(result, separator, seconds)
return result
def get_cfg_group_id():
group_data = grp.getgrnam(vyos.defaults.cfg_group)
return group_data.gr_gid
def file_is_persistent(path):
if not re.match(r'^(/config|/opt/vyatta/etc/config)', os.path.dirname(path)):
warning = "Warning: file {0} is outside the /config directory\n".format(path)
warning += "It will not be automatically migrated to a new image on system update"
return (False, warning)
else:
return (True, None)
def commit_in_progress():
""" Not to be used in normal op mode scripts! """
# The CStore backend locks the config by opening a file
# The file is not removed after commit, so just checking
# if it exists is insufficient, we need to know if it's open by anyone
# There are two ways to check if any other process keeps a file open.
# The first one is to try opening it and see if the OS objects.
# That's faster but prone to race conditions and can be intrusive.
# The other one is to actually check if any process keeps it open.
# It's non-intrusive but needs root permissions, else you can't check
# processes of other users.
#
# Since this will be used in scripts that modify the config outside of the CLI
# framework, those knowingly have root permissions.
# For everything else, we add a safeguard.
id = subprocess.check_output(['/usr/bin/id', '-u']).decode().strip()
if id != '0':
raise OSError("This functions needs root permissions to return correct results")
for proc in psutil.process_iter():
try:
files = proc.open_files()
if files:
for f in files:
if f.path == vyos.defaults.commit_lock:
return True
except psutil.NoSuchProcess as err:
# Process died before we could examine it
pass
# Default case
return False
def wait_for_commit_lock():
""" Not to be used in normal op mode scripts! """
# Very synchronous approach to multiprocessing
while commit_in_progress():
time.sleep(1)
def ask_yes_no(question, default=False) -> bool:
"""Ask a yes/no question via input() and return their answer."""
default_msg = "[Y/n]" if default else "[y/N]"
while True:
sys.stdout.write("%s %s " % (question, default_msg))
c = input().lower().strip()
if c == '':
return default
elif c in ("y", "ye", "yes"):
return True
elif c in ("n", "no"):
return False
else:
sys.stdout.write("Please respond with yes/y or no/n\n")
def process_named_running(name):
""" Checks if process with given name is running and returns its PID.
If Process is not running, return None
"""
for p in psutil.process_iter():
if name in p.name():
return p.pid
return None
|
