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
|
#
# Copyright:: Copyright (c) Chef Software Inc.
# Copyright:: 2016-2020, Virender Khatri
#
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "../resource"
class Chef
class Resource
class Alternatives < Chef::Resource
unified_mode true
provides(:alternatives) { true }
description "The alternatives resource allows for configuration of command alternatives in Linux using the alternatives or update-alternatives packages."
introduced "16.0"
property :link_name, String, name_property: true
property :link, String, default: lazy { |n| "/usr/bin/#{n.link_name}" }
property :path, String
property :priority, [String, Integer], coerce: proc { |n| n.to_i }
def define_resource_requirements
requirements.assert(:install) do |a|
a.assertion do
!new_resource.priority.nil?
end
a.failure_message("Could not set alternatives for #{new_resource.link_name}, you must provide the :priority property")
end
requirements.assert(:install, :set, :remove) do |a|
a.assertion do
!new_resource.path.nil?
end
a.failure_message("Could not set alternatives for #{new_resource.link_name}, you must provide the :path property")
end
requirements.assert(:install, :set, :remove) do |a|
a.assertion do
::File.exist?(new_resource.path)
end
a.whyrun("Assuming file #{new_resource.path} already exists or was created already")
a.failure_message("Could not set alternatives for #{new_resource.link_name}, missing #{new_resource.path}")
end
end
action :install do
if path_priority != new_resource.priority
converge_by("adding alternative #{new_resource.link} #{new_resource.link_name} #{new_resource.path} #{new_resource.priority}") do
output = shell_out(alternatives_cmd, "--install", new_resource.link, new_resource.link_name, new_resource.path, new_resource.priority)
unless output.exitstatus == 0
raise "failed to add alternative #{new_resource.link} #{new_resource.link_name} #{new_resource.path} #{new_resource.priority}"
end
end
end
end
action :set do
if current_path != new_resource.path
converge_by("setting alternative #{new_resource.link_name} #{new_resource.path}") do
output = shell_out(alternatives_cmd, "--set", new_resource.link_name, new_resource.path)
unless output.exitstatus == 0
raise "failed to set alternative #{new_resource.link_name} #{new_resource.path} \n #{output.stdout.strip}"
end
end
end
end
action :remove do
if path_exists?
converge_by("removing alternative #{new_resource.link_name} #{new_resource.path}") do
shell_out(alternatives_cmd, "--remove", new_resource.link_name, new_resource.path)
end
end
end
action :auto do
converge_by("setting auto alternative #{new_resource.link_name}") do
shell_out(alternatives_cmd, "--auto", new_resource.link_name)
end
end
action :refresh do
converge_by("refreshing alternative #{new_resource.link_name}") do
shell_out(alternatives_cmd, "--refresh", new_resource.link_name)
end
end
action_class do
#
# @return [String] The appropriate alternatives command based on the platform
#
def alternatives_cmd
if debian?
"update-alternatives"
else
"alternatives"
end
end
#
# @return [Integer] The current path priority for the link_name alternative
#
def path_priority
# https://rubular.com/r/IcUlEU0mSNaMm3
escaped_path = Regexp.new(Regexp.escape("#{new_resource.path} - priority ") + "(.*)")
match = shell_out(alternatives_cmd, "--display", new_resource.link_name).stdout.match(escaped_path)
match.nil? ? nil : match[1].to_i
end
#
# @return [String] The current path for the link_name alternative
#
def current_path
# https://rubular.com/r/ylsuvzUtquRPqc
match = shell_out(alternatives_cmd, "--display", new_resource.link_name).stdout.match(/link currently points to (.*)/)
match[1]
end
#
# @return [Boolean] does the path exist for the link_name alternative
#
def path_exists?
# https://rubular.com/r/ogvDdq8h2IKRff
escaped_path = Regexp.new(Regexp.escape("#{new_resource.path} - priority"))
shell_out(alternatives_cmd, "--display", new_resource.link_name).stdout.match?(escaped_path)
end
end
end
end
end
|
