old_contents: #!/usr/bin/env python
  #
  # Copyright 2011-2014 The Rust Project Developers. See the COPYRIGHT
  # file at the top-level directory of this distribution and at
  # http://rust-lang.org/COPYRIGHT.
  #
  # Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
  # http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
  # <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
  # option. This file may not be copied, modified, or distributed
  # except according to those terms.
  
  import os, tarfile, re, shutil, sys
  from snapshot import *
  
  def unpack_snapshot(triple, dl_path):
      print("opening snapshot " + dl_path)
      tar = tarfile.open(dl_path)
      kernel = get_kernel(triple)
  
      stagep = os.path.join(triple, "stage0")
  
      # Remove files from prior unpackings, since snapshot rustc may not
      # be able to disambiguate between multiple candidate libraries.
      # (Leave dirs in place since extracting step still needs them.)
      for root, _, files in os.walk(stagep):
          for f in files:
              print("removing " + os.path.join(root, f))
              os.unlink(os.path.join(root, f))
  
      for p in tar.getnames():
          name = p.replace("rust-stage0/", "", 1);
  
          fp = os.path.join(stagep, name)
          print("extracting " + p)
          tar.extract(p, download_unpack_base)
          tp = os.path.join(download_unpack_base, p)
          if os.path.isdir(tp) and os.path.exists(fp):
                  continue
          shutil.move(tp, fp)
      tar.close()
      shutil.rmtree(download_unpack_base)
  
  
  # Main
  
  # this gets called with one or two arguments:
  # The first is the O/S triple.
  # The second is an optional path to the snapshot to use.
  
  triple = sys.argv[1]
  if len(sys.argv) == 3:
      dl_path = sys.argv[2]
  else:
      snap = determine_curr_snapshot(triple)
      dl = os.path.join(download_dir_base, snap)
      url = download_url_base + "/" + snap
      print("determined most recent snapshot: " + snap)
  
      if (not os.path.exists(dl)):
          get_url_to_file(url, dl)
  
      if (snap_filename_hash_part(snap) == hash_file(dl)):
          print("got download with ok hash")
      else:
          raise Exception("bad hash on download")
  
      dl_path = os.path.join(download_dir_base, snap)
  
  unpack_snapshot(triple, dl_path)
  
new_contents: #!/usr/bin/env python
  #
  # Copyright 2011-2014 The Rust Project Developers. See the COPYRIGHT
  # file at the top-level directory of this distribution and at
  # http://rust-lang.org/COPYRIGHT.
  #
  # Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
  # http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
  # <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
  # option. This file may not be copied, modified, or distributed
  # except according to those terms.
  
  import os, tarfile, re, shutil, sys
  from snapshot import *
  
  def unpack_snapshot(triple, dl_path):
      print("opening snapshot " + dl_path)
      tar = tarfile.open(dl_path)
      kernel = get_kernel(triple)
  
      stagep = os.path.join(triple, "stage0")
  
      # Remove files from prior unpackings, since snapshot rustc may not
      # be able to disambiguate between multiple candidate libraries.
      # (Leave dirs in place since extracting step still needs them.)
      for root, _, files in os.walk(stagep):
          for f in files:
              print("removing " + os.path.join(root, f))
              os.unlink(os.path.join(root, f))
  
      for p in tar.getnames():
          name = p.replace("rust-stage0/", "", 1);
  
          fp = os.path.join(stagep, name)
          print("extracting " + p)
          tar.extract(p, download_unpack_base)
          tp = os.path.join(download_unpack_base, p)
          if os.path.isdir(tp) and os.path.exists(fp):
                  continue
          shutil.move(tp, fp)
      tar.close()
      shutil.rmtree(download_unpack_base)
  
  
  # Main
  
  # this gets called with one or two arguments:
  # The first is the O/S triple.
  # The second is an optional path to the snapshot to use.
  
  def main(argv):
      triple = argv[1]
      if len(argv) == 3:
          dl_path = argv[2]
      else:
          snap = determine_curr_snapshot(triple)
          dl = os.path.join(download_dir_base, snap)
          url = download_url_base + "/" + snap
          print("determined most recent snapshot: " + snap)
  
          if (not os.path.exists(dl)):
              get_url_to_file(url, dl)
  
          if (snap_filename_hash_part(snap) == hash_file(dl)):
              print("got download with ok hash")
          else:
              raise Exception("bad hash on download")
  
          dl_path = os.path.join(download_dir_base, snap)
  
      unpack_snapshot(triple, dl_path)
  
  if __name__ == '__main__':
      main(sys.argv)
  
subject: make get-snapshot externally usable