137 lines
4.5 KiB
Ruby
Executable file
137 lines
4.5 KiB
Ruby
Executable file
# Script to concat files to a config file.
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#
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# Given a directory like this:
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# /path/to/conf.d
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# |-- fragments
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# | |-- 00_named.conf
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# | |-- 10_domain.net
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# | `-- zz_footer
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#
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# The script supports a test option that will build the concat file to a temp location and
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# use /usr/bin/cmp to verify if it should be run or not. This would result in the concat happening
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# twice on each run but gives you the option to have an unless option in your execs to inhibit rebuilds.
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#
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# Without the test option and the unless combo your services that depend on the final file would end up
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# restarting on each run, or in other manifest models some changes might get missed.
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#
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# OPTIONS:
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# -o The file to create from the sources
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# -d The directory where the fragments are kept
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# -t Test to find out if a build is needed, basically concats the files to a temp
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# location and compare with what's in the final location, return codes are designed
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# for use with unless on an exec resource
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# -w Add a shell style comment at the top of the created file to warn users that it
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# is generated by puppet
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# -f Enables the creation of empty output files when no fragments are found
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# -n Sort the output numerically rather than the default alpha sort
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#
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# the command:
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#
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# concatfragments.rb -o /path/to/conffile.cfg -d /path/to/conf.d
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#
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# creates /path/to/conf.d/fragments.concat and copies the resulting
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# file to /path/to/conffile.cfg. The files will be sorted alphabetically
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# pass the -n switch to sort numerically.
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#
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# The script does error checking on the various dirs and files to make
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# sure things don't fail.
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require 'optparse'
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require 'fileutils'
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settings = {
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:outfile => "",
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:workdir => "",
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:test => false,
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:force => false,
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:warn => "",
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:sortarg => ""
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}
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OptionParser.new do |opts|
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opts.banner = "Usage: #{$0} [options]"
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opts.separator "Specific options:"
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opts.on("-o", "--outfile OUTFILE", String, "The file to create from the sources") do |o|
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settings[:outfile] = o
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end
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opts.on("-d", "--workdir WORKDIR", String, "The directory where the fragments are kept") do |d|
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settings[:workdir] = d
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end
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opts.on("-t", "--test", "Test to find out if a build is needed") do
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settings[:test] = true
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end
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opts.separator "Other options:"
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opts.on("-w", "--warn WARNMSG", String,
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"Add a shell style comment at the top of the created file to warn users that it is generated by puppet") do |w|
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settings[:warn] = w
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end
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opts.on("-f", "--force", "Enables the creation of empty output files when no fragments are found") do
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settings[:force] = true
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end
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opts.on("-n", "--sort", "Sort the output numerically rather than the default alpha sort") do
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settings[:sortarg] = "-n"
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end
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end.parse!
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# do we have -o?
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raise 'Please specify an output file with -o' unless !settings[:outfile].empty?
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# do we have -d?
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raise 'Please specify fragments directory with -d' unless !settings[:workdir].empty?
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# can we write to -o?
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if File.file?(settings[:outfile])
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if !File.writable?(settings[:outfile])
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raise "Cannot write to #{settings[:outfile]}"
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end
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else
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if !File.writable?(File.dirname(settings[:outfile]))
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raise "Cannot write to dirname #{File.dirname(settings[:outfile])} to create #{settings[:outfile]}"
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end
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end
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# do we have a fragments subdir inside the work dir?
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if !File.directory?(File.join(settings[:workdir], "fragments")) && !File.executable?(File.join(settings[:workdir], "fragments"))
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raise "Cannot access the fragments directory"
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end
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# are there actually any fragments?
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if (Dir.entries(File.join(settings[:workdir], "fragments")) - %w{ . .. }).empty?
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if !settings[:force]
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raise "The fragments directory is empty, cowardly refusing to make empty config files"
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end
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end
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Dir.chdir(settings[:workdir])
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if settings[:warn].empty?
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File.open("fragments.concat", 'w') {|f| f.write("") }
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else
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File.open("fragments.concat", 'w') {|f| f.write("#{settings[:warn]}\n") }
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end
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# find all the files in the fragments directory, sort them numerically and concat to fragments.concat in the working dir
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open('fragments.concat', 'a') do |f|
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Dir.entries("fragments").sort.each{ |entry|
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if File.file?(File.join("fragments", entry))
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f << File.read(File.join("fragments", entry))
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end
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}
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end
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if !settings[:test]
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# This is a real run, copy the file to outfile
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FileUtils.cp 'fragments.concat', settings[:outfile]
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else
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# Just compare the result to outfile to help the exec decide
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if FileUtils.cmp 'fragments.concat', settings[:outfile]
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exit 0
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else
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exit 1
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end
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end
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