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# Copyright (c) 2014, Chris Church <chris@ninemoreminutes.com>
# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
name: sh
short_description: "POSIX shell (/bin/sh)"
version_added: historical
description:
- This shell plugin is the one you want to use on most Unix systems, it is the most compatible and widely installed shell.
extends_documentation_fragment:
- shell_common
'''
import shlex
from ansible.plugins.shell import ShellBase
class ShellModule(ShellBase):
# Common shell filenames that this plugin handles.
# Note: sh is the default shell plugin so this plugin may also be selected
# This code needs to be SH-compliant. BASH-isms will not work if /bin/sh points to a non-BASH shell.
# if the filename is not listed in any Shell plugin.
COMPATIBLE_SHELLS = frozenset(('sh', 'zsh', 'bash', 'dash', 'ksh'))
# Family of shells this has. Must match the filename without extension
SHELL_FAMILY = 'sh'
# commonly used
ECHO = 'echo'
COMMAND_SEP = ';'
# How to end lines in a python script one-liner
_SHELL_EMBEDDED_PY_EOL = '\n'
_SHELL_REDIRECT_ALLNULL = '> /dev/null 2>&1'
_SHELL_AND = '&&'
_SHELL_OR = '||'
_SHELL_SUB_LEFT = '"`'
_SHELL_SUB_RIGHT = '`"'
_SHELL_GROUP_LEFT = '('
_SHELL_GROUP_RIGHT = ')'
def checksum(self, path, python_interp):
# In the following test, each condition is a check and logical
# comparison (|| or &&) that sets the rc value. Every check is run so
# the last check in the series to fail will be the rc that is returned.
#
# If a check fails we error before invoking the hash functions because
# hash functions may successfully take the hash of a directory on BSDs
# (UFS filesystem?) which is not what the rest of the ansible code expects
#
# If all of the available hashing methods fail we fail with an rc of 0.
# This logic is added to the end of the cmd at the bottom of this function.
# Return codes:
# checksum: success!
# 0: Unknown error
# 1: Remote file does not exist
# 2: No read permissions on the file
# 3: File is a directory
# 4: No python interpreter
# Quoting gets complex here. We're writing a python string that's
# used by a variety of shells on the remote host to invoke a python
# "one-liner".
shell_escaped_path = shlex.quote(path)
test = "rc=flag; [ -r %(p)s ] %(shell_or)s rc=2; [ -f %(p)s ] %(shell_or)s rc=1; [ -d %(p)s ] %(shell_and)s rc=3; %(i)s -V 2>/dev/null %(shell_or)s rc=4; [ x\"$rc\" != \"xflag\" ] %(shell_and)s echo \"${rc} \"%(p)s %(shell_and)s exit 0" % dict(p=shell_escaped_path, i=python_interp, shell_and=self._SHELL_AND, shell_or=self._SHELL_OR) # NOQA
csums = [
u"({0} -c 'import hashlib; BLOCKSIZE = 65536; hasher = hashlib.sha1();{2}afile = open(\"'{1}'\", \"rb\"){2}buf = afile.read(BLOCKSIZE){2}while len(buf) > 0:{2}\thasher.update(buf){2}\tbuf = afile.read(BLOCKSIZE){2}afile.close(){2}print(hasher.hexdigest())' 2>/dev/null)".format(python_interp, shell_escaped_path, self._SHELL_EMBEDDED_PY_EOL), # NOQA Python > 2.4 (including python3)
u"({0} -c 'import sha; BLOCKSIZE = 65536; hasher = sha.sha();{2}afile = open(\"'{1}'\", \"rb\"){2}buf = afile.read(BLOCKSIZE){2}while len(buf) > 0:{2}\thasher.update(buf){2}\tbuf = afile.read(BLOCKSIZE){2}afile.close(){2}print(hasher.hexdigest())' 2>/dev/null)".format(python_interp, shell_escaped_path, self._SHELL_EMBEDDED_PY_EOL), # NOQA Python == 2.4
]
cmd = (" %s " % self._SHELL_OR).join(csums)
cmd = "%s; %s %s (echo \'0 \'%s)" % (test, cmd, self._SHELL_OR, shell_escaped_path)
return cmd
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