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