code: def do_setup():
      """Main VCS-independent setup function for installing Versioneer."""
      root = get_root()
      try:
          cfg = get_config_from_root(root)
      except (
          OSError,
          configparser.NoSectionError,
          configparser.NoOptionError,
      ) as e:
          if isinstance(
              e, (EnvironmentError, configparser.NoSectionError)
          ):
              print(
                  "Adding sample versioneer config to setup.cfg",
                  file=sys.stderr,
              )
              with open(os.path.join(root, "setup.cfg"), "a") as f:
                  f.write(SAMPLE_CONFIG)
          print(CONFIG_ERROR, file=sys.stderr)
          return 1
  
      print(" creating %s" % cfg.versionfile_source)
      with open(cfg.versionfile_source, "w") as f:
          LONG = LONG_VERSION_PY[cfg.VCS]
          f.write(
              LONG
              % {
                  "DOLLAR": "$",
                  "STYLE": cfg.style,
                  "TAG_PREFIX": cfg.tag_prefix,
                  "PARENTDIR_PREFIX": cfg.parentdir_prefix,
                  "VERSIONFILE_SOURCE": cfg.versionfile_source,
              }
          )
  
      ipy = os.path.join(
          os.path.dirname(cfg.versionfile_source), "__init__.py"
      )
      if os.path.exists(ipy):
          try:
              with open(ipy) as f:
                  old = f.read()
          except OSError:
              old = ""
          if INIT_PY_SNIPPET not in old:
              print(" appending to %s" % ipy)
              with open(ipy, "a") as f:
                  f.write(INIT_PY_SNIPPET)
          else:
              print(" %s unmodified" % ipy)
      else:
          print(" %s doesn't exist, ok" % ipy)
          ipy = None
  
      # Make sure both the top-level "versioneer.py" and versionfile_source
      # (PKG/_version.py, used by runtime code) are in MANIFEST.in, so
      # they'll be copied into source distributions. Pip won't be able to
      # install the package without this.
      manifest_in = os.path.join(root, "MANIFEST.in")
      simple_includes = set()
      try:
          with open(manifest_in) as f:
              for line in f:
                  if line.startswith("include "):
                      for include in line.split()[1:]:
                          simple_includes.add(include)
      except OSError:
          pass
      # That doesn't cover everything MANIFEST.in can do
      # (http://docs.python.org/2/distutils/sourcedist.html#commands), so
      # it might give some false negatives. Appending redundant 'include'
      # lines is safe, though.
      if "versioneer.py" not in simple_includes:
          print(" appending 'versioneer.py' to MANIFEST.in")
          with open(manifest_in, "a") as f:
              f.write("include versioneer.py\n")
      else:
          print(" 'versioneer.py' already in MANIFEST.in")
      if cfg.versionfile_source not in simple_includes:
          print(
              " appending versionfile_source ('%s') to MANIFEST.in"
              % cfg.versionfile_source
          )
          with open(manifest_in, "a") as f:
              f.write("include %s\n" % cfg.versionfile_source)
      else:
          print(" versionfile_source already in MANIFEST.in")
  
      # Make VCS-specific changes. For git, this means creating/changing
      # .gitattributes to mark _version.py for export-subst keyword
      # substitution.
      do_vcs_install(manifest_in, cfg.versionfile_source, ipy)
      return 0
  
imports: import errno
  import json
  import os
  import re
  import subprocess
  import sys
label_desc: Use image node_id 23 for calling a global function with example usage: do_setup() and returns: int, int