adding mtree_to_xml.py
This commit is contained in:
brent s
parent
399819748f
commit
81f85b7e48
314
storage/mtree_to_xml.py
Executable file
314
storage/mtree_to_xml.py
Executable file
@ -0,0 +1,314 @@
|
|||||||
|
#!/usr/bin/env python3
|
||||||
|
|
||||||
|
import argparse
|
||||||
|
import copy
|
||||||
|
import datetime
|
||||||
|
import os
|
||||||
|
import pathlib
|
||||||
|
import re
|
||||||
|
import sys
|
||||||
|
import lxml.etree
|
||||||
|
|
||||||
|
|
||||||
|
# Serialize BSD mtree spec files into XML.
|
||||||
|
# On arch, BSD mtree is ported in the AUR as nmtree.
|
||||||
|
|
||||||
|
# THIS IS INCOMPLETE!
|
||||||
|
|
||||||
|
class MtreeXML(object):
|
||||||
|
def __init__(self, spec):
|
||||||
|
# spec is a string or bytes
|
||||||
|
if not isinstance(spec, (str, bytes)):
|
||||||
|
raise ValueError('spec must be a raw string of the spec or a bytes object of the string')
|
||||||
|
if isinstance(spec, bytes):
|
||||||
|
try:
|
||||||
|
spec = spec.decode('utf-8')
|
||||||
|
except UnicodeDecodeError:
|
||||||
|
raise ValueError('spec must be a utf-8 encoded set of bytes if using byte mode')
|
||||||
|
self._strptime_fmt = '%a %b %d %H:%M:%S %Y'
|
||||||
|
self.orig_spec = copy.deepcopy(spec) # For referencing in case someone wanted to write it out.
|
||||||
|
# We NOW need to handle the escaped linebreaking it does.
|
||||||
|
self._specdata = re.sub('\\\\\s+', '', spec).splitlines()
|
||||||
|
self._get_header()
|
||||||
|
self._spec = {'header': self._header,
|
||||||
|
'paths': {}}
|
||||||
|
# Template for an item.
|
||||||
|
# Default keywords are:
|
||||||
|
# flags, gid, link, mode, nlink, size, time, type, uid
|
||||||
|
self._tplitem = {
|
||||||
|
'type': None, # ('block', 'char', 'dir', 'fifo', 'file', 'link', 'socket')
|
||||||
|
# checksum of file (if it's a file) (int)
|
||||||
|
# On all *nix platforms, the cksum(1) utility (which is what the mtree spec uses) follows
|
||||||
|
# the POSIX standard CRC (which is NOT CRC-1/CRC-16 nor CRC32!):
|
||||||
|
# http://pubs.opengroup.org/onlinepubs/009695299/utilities/cksum.html
|
||||||
|
# For a python implementation,
|
||||||
|
# https://stackoverflow.com/questions/6835381/python-equivalent-of-unix-cksum-function
|
||||||
|
# See also crcmod (in PyPi).
|
||||||
|
'cksum': None,
|
||||||
|
# "The device number to use for block or char file types." Should be converted to a tuple of one
|
||||||
|
# of the following:
|
||||||
|
# - (format(str), major(int), minor(int))
|
||||||
|
# - (format(str), major(int), unit(str?), subunit(str?)) (only used on bsdos formats)
|
||||||
|
# - (number(int?), ) ("opaque" number)
|
||||||
|
# Valid formats are, per man page of mtree:
|
||||||
|
# native, 386bsd, 4bsd, bsdos, freebsd, hpux, isc, linux, netbsd, osf1, sco, solaris, sunos,
|
||||||
|
# svr3, svr4, ultrix
|
||||||
|
'device': None,
|
||||||
|
# File flags as symbolic name. BSD-specific thing? TODO: testing on BSD system
|
||||||
|
'flags': [],
|
||||||
|
'ignore': False, # An mtree-internal flag to ignore hierarchy under this item
|
||||||
|
'gid': None, # The group ID (int)
|
||||||
|
'gname': None, # The group name (str)
|
||||||
|
'link': None, # The link target/source, if a link.
|
||||||
|
# The MD5 checksum digest (str? hex?). "md5digest" is a synonym for this, so it's consolidated in
|
||||||
|
# as the same keyword.
|
||||||
|
'md5': None,
|
||||||
|
# The mode (in octal) (we convert it to a python-native int for os.chmod/stat, etc.)
|
||||||
|
# May also be a symbolic value; TODO: map symbolic to octal/int.
|
||||||
|
'mode': None,
|
||||||
|
'nlink': None, # Number of hard links for this item.
|
||||||
|
'optional': False, # This item may or may not be present in the compared directory for checking.
|
||||||
|
'rmd160': None, # The RMD-160 checksum of the file. "rmd160digest" is a synonym.
|
||||||
|
'sha1': None, # The SHA-1 sum. "sha1digest" is a synonym.
|
||||||
|
'sha256': None, # SHA-2 256-bit checksum; "sha256digest" is a synonym.
|
||||||
|
'sha384': None, # SHA-2 384-bit checksum; "sha384digest" is a synonym.
|
||||||
|
'sha512': None, # SHA-2 512-bit checksum; "sha512digest" is a synonym.
|
||||||
|
'size': None, # Size of the file in bytes (int).
|
||||||
|
'tags': [], # mtree-internal tags (comma-separated in the mtree spec).
|
||||||
|
'time': None, # Time the file was last modified (in Epoch fmt as float).
|
||||||
|
'uid': None, # File owner UID (int)
|
||||||
|
'uname': None # File owner username (str)
|
||||||
|
# And lastly, "children" is where the children files/directories go. We don't include it in the template;
|
||||||
|
# it's added programmatically.
|
||||||
|
# 'children': {}
|
||||||
|
}
|
||||||
|
# Global aspects are handled by "/set" directives.
|
||||||
|
# They are restored by an "/unset". Since they're global and stateful, they're handled as a class attribute.
|
||||||
|
self._settings = copy.deepcopy(self._tplitem)
|
||||||
|
self._parse_items()
|
||||||
|
del(self._settings, self._tplitem, self._strptime_fmt, self._specdata)
|
||||||
|
|
||||||
|
|
||||||
|
def _get_header(self):
|
||||||
|
self._header = {}
|
||||||
|
_headre = re.compile('^#\s+(user|machine|tree|date):\s')
|
||||||
|
_cmtre = re.compile('^\s*#\s*')
|
||||||
|
_blklnre = re.compile('^\s*$')
|
||||||
|
for idx, line in enumerate(self._specdata):
|
||||||
|
if _headre.search(line): # We found a header item.
|
||||||
|
l = [i.lstrip() for i in _cmtre.sub('', line).split(':', 1)]
|
||||||
|
header = l[0]
|
||||||
|
val = (l[1] if l[1] is not '(null)' else None)
|
||||||
|
if header == 'date':
|
||||||
|
val = datetime.datetime.strptime(val, self._strptime_fmt)
|
||||||
|
elif header == 'tree':
|
||||||
|
val = pathlib.PosixPath(val)
|
||||||
|
self._header[header] = val
|
||||||
|
elif _blklnre.search(line):
|
||||||
|
break # We've reached the end of the header. Otherwise...
|
||||||
|
else: # We definitely shouldn't be here, but this means the spec doesn't even have a header.
|
||||||
|
break
|
||||||
|
return()
|
||||||
|
|
||||||
|
def _parse_items(self):
|
||||||
|
# A pattern (compiled for performance) to match commands.
|
||||||
|
_stngsre = re.compile('^/(un)?set\s')
|
||||||
|
# Per the man page:
|
||||||
|
# "Empty lines and lines whose first non-whitespace character is a hash mark (‘#’) are ignored."
|
||||||
|
_ignre = re.compile('^(\s*(#.*)?)?$')
|
||||||
|
# The following regex is used to quickly and efficiently check for a synonymized hash name.
|
||||||
|
_hashre = re.compile('^(md5|rmd160|sha1|sha256|sha384|sha512)(digest)?$')
|
||||||
|
# The following regex is to test if we need to traverse upwards in the path.
|
||||||
|
_parentre = re.compile('^\.{,2}/?$')
|
||||||
|
# _curpath = self.header['tree']
|
||||||
|
_curpath = pathlib.PosixPath('/')
|
||||||
|
_types = ('block', 'char', 'dir', 'fifo', 'file', 'link', 'socket')
|
||||||
|
# This parses keywords. Used by both item specs and /set.
|
||||||
|
def _kwparse(kwline):
|
||||||
|
out = {}
|
||||||
|
for i in kwline:
|
||||||
|
l = i.split('=', 1)
|
||||||
|
if len(l) < 2:
|
||||||
|
l.append(None)
|
||||||
|
k, v = l
|
||||||
|
if v == 'none':
|
||||||
|
v = None
|
||||||
|
# These are represented as octals.
|
||||||
|
if k in ('mode', ):
|
||||||
|
# TODO: handle symbolic references too (e.g. rwxrwxrwx)
|
||||||
|
if v.isdigit():
|
||||||
|
v = int(v, 8) # Convert from the octal. This can then be used directly with os.chmod etc.
|
||||||
|
# These are represented as ints
|
||||||
|
elif k in ('uid', 'gid', 'cksum', 'nlink'):
|
||||||
|
if v.isdigit():
|
||||||
|
v = int(v)
|
||||||
|
# These are booleans (represented as True by their presence).
|
||||||
|
elif k in ('ignore', 'optional'):
|
||||||
|
v = True
|
||||||
|
# These are lists (comma-separated).
|
||||||
|
elif k in ('flags', 'tags'):
|
||||||
|
if v:
|
||||||
|
v = [i.strip() for i in v.split(',')]
|
||||||
|
# The following are synonyms.
|
||||||
|
elif _hashre.search(k):
|
||||||
|
k = _hashre.sub('\g<1>', k)
|
||||||
|
elif k == 'time':
|
||||||
|
v = datetime.datetime.fromtimestamp(float(v))
|
||||||
|
elif k == 'type':
|
||||||
|
if v not in _types:
|
||||||
|
raise ValueError('{0} not one of: {1}'.format(v, ', '.join(_types)))
|
||||||
|
out[k] = v
|
||||||
|
return(out)
|
||||||
|
def _unset_parse(unsetline):
|
||||||
|
out = {}
|
||||||
|
for i in unsetline:
|
||||||
|
out[i] = self._tplitem[i]
|
||||||
|
return(out)
|
||||||
|
# The Business-End (TM)
|
||||||
|
for idx, line in enumerate(self._specdata):
|
||||||
|
_fname = copy.deepcopy(_curpath)
|
||||||
|
# Skip these lines
|
||||||
|
if _ignre.search(line):
|
||||||
|
continue
|
||||||
|
l = line.split()
|
||||||
|
if _parentre.search(line):
|
||||||
|
_curpath = _curpath.parent
|
||||||
|
elif not _stngsre.search(line):
|
||||||
|
# So it's an item, not a command.
|
||||||
|
_itemsettings = copy.deepcopy(self._settings)
|
||||||
|
_itemsettings.update(_kwparse(l[1:]))
|
||||||
|
if _itemsettings['type'] == 'dir':
|
||||||
|
# SOMEONE PLEASE let me know if there's a cleaner way to do this.
|
||||||
|
_curpath = pathlib.PosixPath(os.path.normpath(_curpath.joinpath(l[0])))
|
||||||
|
_fname = _curpath
|
||||||
|
else:
|
||||||
|
_fname = pathlib.PosixPath(os.path.normpath(_curpath.joinpath(l[0])))
|
||||||
|
self._spec['paths'][_fname] = _itemsettings
|
||||||
|
else:
|
||||||
|
# It's a command. We can safely split on whitespace since the man page specifies the
|
||||||
|
# values are not to contain whitespace.
|
||||||
|
# /set
|
||||||
|
if l[0] == '/set':
|
||||||
|
del(l[0])
|
||||||
|
self._settings.update(_kwparse(l))
|
||||||
|
# /unset
|
||||||
|
else:
|
||||||
|
self._settings.update(_unset_parse(l))
|
||||||
|
continue
|
||||||
|
return()
|
||||||
|
|
||||||
|
def convert(self, architecture = 'shallow'):
|
||||||
|
# If architecture is 'shallow', create the following structure:
|
||||||
|
# <mtree ...>
|
||||||
|
# <item path='/path/to/item' keyword1='kw1_value' ... />
|
||||||
|
# <item path='/path/to/another/item' keyword1='kw2_value' ... />
|
||||||
|
# </mtree>
|
||||||
|
# If 'deep',
|
||||||
|
# <mtree ...>
|
||||||
|
# <item>
|
||||||
|
# <path>/path/to/item</path>
|
||||||
|
# <keyword1>kw1_value</keyword1>
|
||||||
|
# ...
|
||||||
|
# </item>
|
||||||
|
# <item>
|
||||||
|
# <path>/path/to/another/item</path>
|
||||||
|
# <keyword1>kw2_value</keyword1>
|
||||||
|
# </item>
|
||||||
|
# </mtree>
|
||||||
|
if architecture not in ('shallow', 'deep'):
|
||||||
|
raise ValueError('The architecture specified is not valid.')
|
||||||
|
# TODO: create XSD
|
||||||
|
# _ns = {
|
||||||
|
# None: 'http://mtreexml.square-r00t.net/',
|
||||||
|
# 'xsi': 'http://www.w3.org/2001/XMLSchema-instance'}
|
||||||
|
# _xsi = {
|
||||||
|
# '{http://www.w3.org/2001/XMLSchema-instance}schemaLocation': 'http://mtreexml.square-r00t.net mtree.xsd'}
|
||||||
|
#self.cfg = lxml.etree.Element('mtree', nsmap = _ns, attrib = _xsi)
|
||||||
|
self.xml = lxml.etree.Element('mtree')
|
||||||
|
# Add the header(s)
|
||||||
|
for k in self._header:
|
||||||
|
if not isinstance(self._header[k], str):
|
||||||
|
self._header[k] = str(self._header[k])
|
||||||
|
self.xml.attrib[k] = copy.deepcopy(self._header[k])
|
||||||
|
# We use this compiled regex to format octals into string representations.
|
||||||
|
_octre = re.compile('^0o')
|
||||||
|
# Now add the paths.
|
||||||
|
for path in self._spec['paths']:
|
||||||
|
p = lxml.etree.Element('item')
|
||||||
|
if architecture == 'deep':
|
||||||
|
e = lxml.etree.Element('path')
|
||||||
|
e.text = str(path)
|
||||||
|
p.append(e)
|
||||||
|
for k in self._spec['paths'][path]:
|
||||||
|
# None attributes
|
||||||
|
if not self._spec['paths'][path][k]:
|
||||||
|
continue
|
||||||
|
# Bools
|
||||||
|
if isinstance(self._spec['paths'][path][k], bool):
|
||||||
|
if architecture == 'shallow':
|
||||||
|
self._spec['paths'][path][k] = str(self._spec['paths'][path][k]).lower()
|
||||||
|
elif architecture == 'deep':
|
||||||
|
e = lxml.etree.Element(k)
|
||||||
|
e.attrib['enabled'] = str(self._spec['paths'][path][k]).lower()
|
||||||
|
p.append(e)
|
||||||
|
continue
|
||||||
|
# Modes are stored in int, so we need a string repr of octal.
|
||||||
|
if k == 'mode':
|
||||||
|
self._spec['paths'][path][k] = '{0:0>4}'.format(_octre.sub('',
|
||||||
|
str(oct(self._spec['paths'][path][k]))))
|
||||||
|
if not isinstance(self._spec['paths'][path][k], str):
|
||||||
|
self._spec['paths'][path][k] = str(self._spec['paths'][path][k])
|
||||||
|
if architecture == 'shallow':
|
||||||
|
if 'path' not in p.attrib:
|
||||||
|
p.attrib['path'] = str(path)
|
||||||
|
p.attrib[k] = self._spec['paths'][path][k]
|
||||||
|
elif architecture == 'deep':
|
||||||
|
e = lxml.etree.Element(k)
|
||||||
|
e.text = self._spec['paths'][path][k]
|
||||||
|
p.append(e)
|
||||||
|
self.xml.append(p)
|
||||||
|
self.xml_str = lxml.etree.tostring(self.xml,
|
||||||
|
encoding = 'utf-8',
|
||||||
|
xml_declaration = True,
|
||||||
|
pretty_print = True).decode('utf-8')
|
||||||
|
return()
|
||||||
|
|
||||||
|
def parseArgs():
|
||||||
|
args = argparse.ArgumentParser(description = 'Parse BSD-style mtree specs into XML.')
|
||||||
|
xmlarch = args.add_mutually_exclusive_group()
|
||||||
|
xmlarch.add_argument('-s', '--shallow',
|
||||||
|
dest = 'architecture',
|
||||||
|
action = 'store_const',
|
||||||
|
const = 'shallow',
|
||||||
|
default = 'shallow',
|
||||||
|
help = 'If specified, create a "shallow" XML structure (default) (conflicts with -d/--deep)')
|
||||||
|
xmlarch.add_argument('-d', '--deep',
|
||||||
|
dest = 'architecture',
|
||||||
|
action = 'store_const',
|
||||||
|
const = 'deep',
|
||||||
|
default = 'shallow',
|
||||||
|
help = 'If specified, create a "deep" XML structure (conflicts with -s/--shallow)')
|
||||||
|
args.add_argument('specfile',
|
||||||
|
nargs = '?',
|
||||||
|
help = ('The path to the mtree spec file. Ignored if data is piped to stdin'))
|
||||||
|
return(args)
|
||||||
|
|
||||||
|
def main():
|
||||||
|
args = vars(parseArgs().parse_args())
|
||||||
|
stdin = None
|
||||||
|
if not sys.stdin.isatty():
|
||||||
|
stdin = sys.sdtin.buffer.read()
|
||||||
|
if stdin:
|
||||||
|
args['spec'] = stdin
|
||||||
|
else:
|
||||||
|
if not args['specfile']:
|
||||||
|
raise argparse.ArgumentError(None, 'You must specify a specfile if you are not piping in one!')
|
||||||
|
args['specfile'] = os.path.abspath(os.path.expanduser(args['specfile']))
|
||||||
|
with open(args['specfile'], 'r') as f:
|
||||||
|
args['spec'] = f.read()
|
||||||
|
mtree = MtreeXML(args['spec'])
|
||||||
|
mtree.convert(args['architecture'])
|
||||||
|
print(mtree.xml_str)
|
||||||
|
|
||||||
|
if __name__ == '__main__':
|
||||||
|
main()
|
||||||
Loading…
Reference in New Issue
Block a user