summaryrefslogtreecommitdiff
path: root/lib/leap_cli/util.rb
blob: 0b0fb9eb54d31810c5694862f066ea4d31d5f872 (plain)
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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
require 'digest/md5'
require 'paint'
require 'fileutils'

module LeapCli

  module Util
    extend self

    ##
    ## QUITTING
    ##

    #
    # quit and print help
    #
    def help!(message=nil)
      ENV['GLI_DEBUG'] = "false"
      help_now!(message)
    end

    #
    # quit with a message that we are bailing out.
    #
    def bail!(message=nil)
      if block_given?
        LeapCli.log_level = 3
        yield
      elsif message
        puts message
      end
      log :bail, ""
      raise SystemExit.new
    end

    #
    # quit with no message
    #
    def quit!(message='')
      puts(message)
      raise SystemExit.new
    end

    #
    # bails out with message if assertion is false.
    #
    def assert!(boolean, message=nil, &block)
      if !boolean
        bail!(message, &block)
      end
    end

    #
    # assert that the command is available
    #
    def assert_bin!(cmd_name)
      assert! `which #{cmd_name}`.strip.any? do
        log :missing, "command '%s'" % cmd_name
      end
    end

    #
    # assert that the command is run without an error.
    # if successful, return output.
    #
    def assert_run!(cmd, message=nil)
      cmd = cmd + " 2>&1"
      output = `#{cmd}`
      unless $?.success?
        bail! do
          log :run, cmd
          log :failed, "(exit #{$?.exitstatus}) #{output}", :indent => 1
          log message, :indent => 1 if message
        end
      else
        log 2, :ran, cmd
      end
      return output
    end

    def assert_files_missing!(*files)
      options = files.last.is_a?(Hash) ? files.pop : {}
      file_list = files.collect { |file_path|
        file_path = Path.named_path(file_path)
        File.exists?(file_path) ? Path.relative_path(file_path) : nil
      }.compact
      if file_list.length > 1
        bail! do
          log :error, "Sorry, we can't continue because these files already exist: #{file_list.join(', ')}."
          log options[:msg] if options[:msg]
        end
      elsif file_list.length == 1
        bail! do
          log :error, "Sorry, we can't continue because this file already exists: #{file_list.first}."
          log options[:msg] if options[:msg]
        end
      end
    end

    def assert_config!(conf_path)
      value = nil
      begin
        value = manager.instance_eval(conf_path)
      rescue NoMethodError
      rescue NameError
      end
      assert! !value.nil? && value != "REQUIRED" do
        log :missing, "required configuration value for #{conf_path}"
      end
    end

    def assert_files_exist!(*files)
      options = files.last.is_a?(Hash) ? files.pop : {}
      file_list = files.collect { |file_path|
        file_path = Path.named_path(file_path)
        !File.exists?(file_path) ? Path.relative_path(file_path) : nil
      }.compact
      if file_list.length > 1
        bail! do
          log :missing, "these files: #{file_list.join(', ')}"
          log options[:msg] if options[:msg]
        end
      elsif file_list.length == 1
        bail! do
          log :missing, "file #{file_list.first}"
          log options[:msg] if options[:msg]
        end
      end
    end

    def file_exists?(*files)
      files.each do |file_path|
        file_path = Path.named_path(file_path)
        if !File.exists?(file_path)
          return false
        end
      end
      return true
    end

    ##
    ## FILES AND DIRECTORIES
    ##

    #
    # creates a directory if it doesn't already exist
    #
    def ensure_dir(dir)
      dir = Path.named_path(dir)
      unless File.directory?(dir)
        assert_files_missing!(dir, :msg => "Cannot create directory #{dir}")
        FileUtils.mkdir_p(dir)
        unless dir =~ /\/$/
          dir = dir + '/'
        end
        log :created, dir
      end
    end

    ##
    ## FILE READING, WRITING, DELETING, and MOVING
    ##

    #
    # All file read and write methods support using named paths in the place of an actual file path.
    #
    # To call using a named path, use a symbol in the place of filepath, like so:
    #
    #   read_file(:known_hosts)
    #
    # In some cases, the named path will take an argument. In this case, set the filepath to be an array:
    #
    #   write_file!([:user_ssh, 'bob'], ssh_key_str)
    #
    # To resolve a named path, use the shortcut helper 'path()'
    #
    #   path([:user_ssh, 'bob'])  ==>   files/users/bob/bob_ssh_pub.key
    #

    def read_file!(filepath)
      filepath = Path.named_path(filepath)
      assert_files_exist!(filepath)
      File.read(filepath)
    end

    def read_file(filepath)
      filepath = Path.named_path(filepath)
      if file_exists?(filepath)
        File.read(filepath)
      end
    end

    def remove_file!(filepath)
      filepath = Path.named_path(filepath)
      if File.exists?(filepath)
        File.unlink(filepath)
        log :removed, filepath
      end
    end

    def remove_directory!(filepath)
      filepath = Path.named_path(filepath)
      if filepath !~ /^#{Regexp.escape(Path.provider)}/ || filepath =~ /\.\./
        raise "sanity check on rm -r did not pass for #{filepath}"
      end
      if File.directory?(filepath)
        FileUtils.rm_r(filepath)
        log :removed, filepath
      end
    end

    def write_file!(filepath, contents)
      filepath = Path.named_path(filepath)
      ensure_dir File.dirname(filepath)
      existed = File.exists?(filepath)
      if existed
        if file_content_equals?(filepath, contents)
          log :nochange, filepath, 2
          return
        end
      end

      File.open(filepath, 'w') do |f|
        f.write contents
      end

      if existed
        log :updated, filepath
      else
        log :created, filepath
      end
    end

    def cmd_exists?(cmd)
      `which #{cmd}`.strip.chars.any?
    end

    #
    # compares md5 fingerprints to see if the contents of a file match the string we have in memory
    #
    def file_content_equals?(filepath, contents)
      filepath = Path.named_path(filepath)
      output = `md5sum '#{filepath}'`.strip
      if $?.to_i == 0
        return output.split(" ").first == Digest::MD5.hexdigest(contents).to_s
      else
        return false
      end
    end

    ##
    ## PROCESSES
    ##

    #
    # run a long running block of code in a separate process and display marching ants as time goes by.
    # if the user hits ctrl-c, the program exits.
    #
    def long_running(&block)
      pid = fork
      if pid == nil
        yield
        exit!
      end
      Signal.trap("SIGINT") do
        Process.kill("KILL", pid)
        Process.wait(pid)
        bail!
      end
      while true
        sleep 0.2
        STDOUT.print '.'
        STDOUT.flush
        break if Process.wait(pid, Process::WNOHANG)
      end
      STDOUT.puts
    end

  end
end