ansible: permit execve() of temporary files on Linux.

pull/193/head
David Wilson 7 years ago
parent d2c009f70f
commit 1fab6d9c25

@ -59,6 +59,19 @@ ansible.module_utils.basic._ANSIBLE_ARGS = '{}'
LOG = logging.getLogger(__name__)
def reopen_readonly(fp):
"""
Replace the file descriptor belonging to the file object `fp` with one
open on the same file (`fp.name`), but opened with :py:data:`os.O_RDONLY`.
This enables temporary files to be executed on Linux, which usually theows
``ETXTBUSY`` if any writeable handle exists pointing to a file passed to
`execve()`.
"""
fd = os.open(fp.name, os.O_RDONLY)
os.dup2(fd, fp.fileno())
os.close(fd)
class Runner(object):
"""
Ansible module runner. After instantiation (with kwargs supplied by the
@ -189,6 +202,7 @@ class ProgramRunner(Runner):
self.program_fp.write(self._get_program())
self.program_fp.flush()
os.chmod(self.program_fp.name, int('0700', 8))
reopen_readonly(self.program_fp)
def _get_program(self):
"""
@ -244,6 +258,7 @@ class ArgsFileRunner(Runner):
)
self.args_fp.write(self._get_args_contents())
self.args_fp.flush()
reopen_readonly(self.program_fp)
def _get_args_contents(self):
"""

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