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# This file is part of cloud-init. See LICENSE file for license information.
import contextlib
import errno
import os
import shutil
import tempfile
_TMPDIR = None
_ROOT_TMPDIR = "/run/cloud-init/tmp"
_EXE_ROOT_TMPDIR = "/var/tmp/cloud-init"
def _tempfile_dir_arg(odir=None, needs_exe=False):
"""Return the proper 'dir' argument for tempfile functions.
When root, cloud-init will use /run/cloud-init/tmp to avoid
any cleaning that a distro boot might do on /tmp (such as
systemd-tmpfiles-clean).
If the caller of this function (mkdtemp or mkstemp) was provided
with a 'dir' argument, then that is respected.
@param odir: original 'dir' arg to 'mkdtemp' or other.
@param needs_exe: Boolean specifying whether or not exe permissions are
needed for tempdir. This is needed because /run is mounted noexec.
"""
if odir is not None:
return odir
if needs_exe:
tdir = _EXE_ROOT_TMPDIR
if not os.path.isdir(tdir):
os.makedirs(tdir)
os.chmod(tdir, 0o1777)
return tdir
global _TMPDIR
if _TMPDIR:
return _TMPDIR
if os.getuid() == 0:
tdir = _ROOT_TMPDIR
else:
tdir = os.environ.get('TMPDIR', '/tmp')
if not os.path.isdir(tdir):
os.makedirs(tdir)
os.chmod(tdir, 0o1777)
_TMPDIR = tdir
return tdir
def ExtendedTemporaryFile(**kwargs):
kwargs['dir'] = _tempfile_dir_arg(
kwargs.pop('dir', None), kwargs.pop('needs_exe', False))
fh = tempfile.NamedTemporaryFile(**kwargs)
# Replace its unlink with a quiet version
# that does not raise errors when the
# file to unlink has been unlinked elsewhere..
def _unlink_if_exists(path):
try:
os.unlink(path)
except OSError as e:
if e.errno != errno.ENOENT:
raise e
fh.unlink = _unlink_if_exists
# Add a new method that will unlink
# right 'now' but still lets the exit
# method attempt to remove it (which will
# not throw due to our del file being quiet
# about files that are not there)
def unlink_now():
fh.unlink(fh.name)
setattr(fh, 'unlink_now', unlink_now)
return fh
@contextlib.contextmanager
def tempdir(rmtree_ignore_errors=False, **kwargs):
# This seems like it was only added in python 3.2
# Make it since its useful...
# See: http://bugs.python.org/file12970/tempdir.patch
tdir = mkdtemp(**kwargs)
try:
yield tdir
finally:
shutil.rmtree(tdir, ignore_errors=rmtree_ignore_errors)
def mkdtemp(**kwargs):
kwargs['dir'] = _tempfile_dir_arg(
kwargs.pop('dir', None), kwargs.pop('needs_exe', False))
return tempfile.mkdtemp(**kwargs)
def mkstemp(**kwargs):
kwargs['dir'] = _tempfile_dir_arg(
kwargs.pop('dir', None), kwargs.pop('needs_exe', False))
return tempfile.mkstemp(**kwargs)
# vi: ts=4 expandtab