Class: Anywhere::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/anywhere/base.rb

Direct Known Subclasses

Local, SSH

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#logger ⇒ Object 



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# File 'lib/anywhere/base.rb', line 8

def logger
  @logger ||= Anywhere::Logger.new
end

Instance Method Details

#add_system_user(login) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 81

def add_system_user()
  raise "user #{} already exists" if user_exists?()
  logger.info "adding system user #{}"
  execute!("#{sudo_cmd} adduser --system #{}")
end

#capture(path, compressed = false) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 16

def capture(path, compressed = false)
  io = StringIO.new
  cmd = "cat #{path}"
  cmd << " | gzip " if compressed
  execute(cmd, nil, io)
  io.rewind
  out = io.read
  if compressed
    # not sure why this is not working with the uncompress method
    out, s = Open3.capture2("cat - | gunzip", stdin_data: out)
    out
  else
    out
  end
end

#do_execute(*args) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 58

def do_execute(*args)
  raise "implement me in subclass"
end

#execute(cmd, stdin = nil, stdout = nil) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 42

def execute(cmd, stdin = nil, stdout = nil)
  do_execute(cmd, stdin, stdout) do |stream, data|
    data.split("\n").each do |line|
      if stream == :stderr
        logger.error line
      elsif !stdout
        logger.debug line
      end
    end
  end
end

#extract_tar(path, dst) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 130

def extract_tar(path, dst)
  ms = Benchmark.measure do
    data = File.open(path, "rb") do |f|
      f.read
    end
    logger.info "writing #{data.length} bytes"
    execute(%(mkdir -p #{dst} && cd #{dst} && tar xfz -), data)
  end
  logger.info "extracted archive in %.3f" % [ms.real]
end

#file_exists?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/anywhere/base.rb', line 62

def file_exists?(path)
  execute("test -e #{path}")
  true
rescue Anywhere::ExecutionError => err
  if err.result.exit_status == 1
    false
  else
    raise
  end
end

#home_dir ⇒ Object 



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# File 'lib/anywhere/base.rb', line 146

def home_dir
  execute("env | grep HOME | cut -d = -f 2").stdout.strip
end

#md5sum(path) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 73

def md5sum(path)
  execute("md5sum #{path} | awk '{ print $1 }'").stdout.strip
end

#mkdir_p(path) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 141

def mkdir_p(path)
  logger.info "creating directory #{path}"
  execute("mkdir -p #{path}")
end

#root? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/anywhere/base.rb', line 12

def root?
  whoami == "root"
end

#run_as(user, cmd) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 87

def run_as(user, cmd)
  execute("sudo -- sudo -u #{user} -- #{cmd}")
end

#sudo_cmd ⇒ Object 



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# File 'lib/anywhere/base.rb', line 77

def sudo_cmd
  @sudo_cmd ||= root? ? "" : "sudo"
end

#uncompress(string) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 32

def uncompress(string)
  require "zlib"
  require "base64"
  zstream = Zlib::Inflate.new
  buf = zstream.inflate(string)
  zstream.finish
  zstream.close
  buf
end

#user_exists?(login) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/anywhere/base.rb', line 91

def user_exists?()
  execute("id #{} 2>/dev/null").success?
end

#whoami ⇒ Object 



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# File 'lib/anywhere/base.rb', line 54

def whoami
  @whoami ||= execute("whoami").stdout.strip
end

#write_file(path, content, attributes = {}) ⇒ Object 



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# File 'lib/anywhere/base.rb', line 95

def write_file(path, content, attributes = {})
  md5 = Digest::MD5.hexdigest(content).to_s
  if file_exists?(path)
    logger.debug "file #{path} already exists"
    file_md5 = md5sum(path)
    if file_md5 == md5
      logger.info "file #{path} did not change => not writing"
      return :not_changed
    end
  end
  logger.info "writing #{content.length} bytes to #{path} (md5: #{md5})"
  tmp_path = "/tmp/anywhere/files.#{md5}"
  execute("#{sudo_cmd} mkdir -p #{File.dirname(tmp_path)}")
  execute("#{sudo_cmd} chown #{whoami} #{File.dirname(tmp_path)}")
  logger.debug "writing to #{tmp_path}"
  execute(%(rm -f #{tmp_path}; cat - > #{tmp_path}), content)
  if mode = attributes[:mode]
    logger.info "changing mode to #{mode}"
    execute("chmod #{mode} #{tmp_path}")
  end
  if owner = attributes[:owner]
    logger.info "changing owner to #{owner}"
    execute("#{sudo_cmd} chown #{owner} #{tmp_path}")
  end
  execute("#{sudo_cmd} mkdir -p #{File.dirname(path)}")
  logger.debug "moving #{tmp_path} to #{path}"
  if file_exists?(path)
    logger.debug "diff #{path} #{tmp_path}"
    execute("diff #{tmp_path} #{path}; /bin/true").stdout.split("\n").each do |line|
      logger.debug line
    end
  end
  execute("#{sudo_cmd} mv #{tmp_path} #{path}")
end