text: """Fetch and edit raster dataset metadata from the command line."""
  
  import logging
  
  import click
  
  import rasterio
  
  
  @click.command(short_help="Print information about the rio environment.")
  @click.option('--formats', 'key', flag_value='formats', default=True,
                help="Enumerate the available formats.")
  @click.pass_context
  def env(ctx, key):
      """Print information about the Rasterio environment: available
      formats, etc.
      """
      verbosity = (ctx.obj and ctx.obj.get('verbosity')) or 1
      stdout = click.get_text_stream('stdout')
      with rasterio.Env(CPL_DEBUG=(verbosity > 2)) as env:
          if key == 'formats':
              for k, v in sorted(env.drivers().items()):
                  stdout.write("%s: %s\n" % (k, v))
              stdout.write('\n')
  