xref: /titanic_52/usr/src/tools/scripts/validate_pkg.py (revision ee4e24edd0ef9555c11f6ddc0a08fcb87f401944)
1#!@PYTHON@
2#
3# CDDL HEADER START
4#
5# The contents of this file are subject to the terms of the
6# Common Development and Distribution License (the "License").
7# You may not use this file except in compliance with the License.
8#
9# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10# or http://www.opensolaris.org/os/licensing.
11# See the License for the specific language governing permissions
12# and limitations under the License.
13#
14# When distributing Covered Code, include this CDDL HEADER in each
15# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16# If applicable, add the following below this CDDL HEADER, with the
17# fields enclosed by brackets "[]" replaced with your own identifying
18# information: Portions Copyright [yyyy] [name of copyright owner]
19#
20# CDDL HEADER END
21#
22
23#
24# Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
25# Use is subject to license terms.
26#
27
28#
29# Compare the content generated by a build to a set of manifests
30# describing how that content is to be delivered.
31#
32
33
34import getopt
35import os
36import stat
37import sys
38
39from pkg import actions
40from pkg import manifest
41
42
43#
44# Dictionary used to map action names to output format.  Each entry is
45# indexed by action name, and consists of a list of tuples that map
46# FileInfo class members to output labels.
47#
48OUTPUTMAP = {
49    "dir": [
50        ("group", "group="),
51        ("mode", "mode="),
52        ("owner", "owner="),
53        ("path", "path=")
54    ],
55    "file": [
56        ("hash", ""),
57        ("group", "group="),
58        ("mode", "mode="),
59        ("owner", "owner="),
60        ("path", "path=")
61    ],
62    "link": [
63        ("mediator", "mediator="),
64        ("path", "path="),
65        ("target", "target=")
66    ],
67    "hardlink": [
68        ("path", "path="),
69        ("hardkey", "target=")
70    ],
71}
72
73# Mode checks used to validate safe file and directory permissions
74ALLMODECHECKS = frozenset(("m", "w", "s", "o"))
75DEFAULTMODECHECKS = frozenset(("m", "w", "o"))
76
77class FileInfo(object):
78    """Base class to represent a file.
79
80    Subclassed according to whether the file represents an actual filesystem
81    object (RealFileInfo) or an IPS manifest action (ActionInfo).
82    """
83
84    def __init__(self):
85        self.path = None
86        self.isdir = False
87        self.target = None
88        self.owner = None
89        self.group = None
90        self.mode = None
91        self.hardkey = None
92        self.hardpaths = set()
93        self.editable = False
94
95    def name(self):
96        """Return the IPS action name of a FileInfo object.
97        """
98        if self.isdir:
99            return "dir"
100
101        if self.target:
102            return "link"
103
104        if self.hardkey:
105            return "hardlink"
106
107        return "file"
108
109    def checkmodes(self, modechecks):
110        """Check for and report on unsafe permissions.
111
112        Returns a potentially empty list of warning strings.
113        """
114        w = []
115
116        t = self.name()
117        if t in ("link", "hardlink"):
118            return w
119        m = int(self.mode, 8)
120        o = self.owner
121        p = self.path
122
123        if "s" in modechecks and t == "file":
124            if m & (stat.S_ISUID | stat.S_ISGID):
125                if m & (stat.S_IRGRP | stat.S_IROTH):
126                    w.extend(["%s: 0%o: setuid/setgid file should not be " \
127                        "readable by group or other" % (p, m)])
128
129        if "o" in modechecks and o != "root" and ((m & stat.S_ISUID) == 0):
130            mu = (m & stat.S_IRWXU) >> 6
131            mg = (m & stat.S_IRWXG) >> 3
132            mo = m & stat.S_IRWXO
133            e = self.editable
134
135            if (((mu & 02) == 0 and (mo & mg & 04) == 04) or
136                (t == "file" and mo & 01 == 1) or
137                (mg, mo) == (mu, mu) or
138                ((t == "file" and not e or t == "dir" and o == "bin") and
139                (mg & 05 == mo & 05)) or
140                (t == "file" and o == "bin" and mu & 01 == 01) or
141                (m & 0105 != 0 and p.startswith("etc/security/dev/"))):
142                w.extend(["%s: owner \"%s\" may be safely " \
143                    "changed to \"root\"" % (p, o)])
144
145        if "w" in modechecks and t == "file" and o != "root":
146            uwx = stat.S_IWUSR | stat.S_IXUSR
147            if m & uwx == uwx:
148                w.extend(["%s: non-root-owned executable should not " \
149                    "also be writable by owner." % p])
150
151        if ("m" in modechecks and
152            m & (stat.S_IWGRP | stat.S_IWOTH) != 0 and
153            m & stat.S_ISVTX == 0):
154            w.extend(["%s: 0%o: should not be writable by group or other" %
155                (p, m)])
156
157        return w
158
159    def __ne__(self, other):
160        """Compare two FileInfo objects.
161
162        Note this is the "not equal" comparison, so a return value of False
163        indicates that the objects are functionally equivalent.
164        """
165        #
166        # Map the objects such that the lhs is always the ActionInfo,
167        # and the rhs is always the RealFileInfo.
168        #
169        # It's only really important that the rhs not be an
170        # ActionInfo; if we're comparing FileInfo the RealFileInfo, it
171        # won't actually matter what we choose.
172        #
173        if isinstance(self, ActionInfo):
174            lhs = self
175            rhs = other
176        else:
177            lhs = other
178            rhs = self
179
180        #
181        # Because the manifest may legitimately translate a relative
182        # path from the proto area into a different path on the installed
183        # system, we don't compare paths here.  We only expect this comparison
184        # to be invoked on items with identical relative paths in
185        # first place.
186        #
187
188        #
189        # All comparisons depend on type.  For symlink and directory, they
190        # must be the same.  For file and hardlink, see below.
191        #
192        typelhs = lhs.name()
193        typerhs = rhs.name()
194        if typelhs in ("link", "dir"):
195            if typelhs != typerhs:
196                return True
197
198        #
199        # For symlinks, all that's left is the link target.
200        # For mediated symlinks targets can differ.
201        #
202        if typelhs == "link":
203            return (lhs.mediator is None) and (lhs.target != rhs.target)
204
205        #
206        # For a directory, it's important that both be directories,
207        # the modes be identical, and the paths are identical.  We already
208        # checked all but the modes above.
209        #
210        # If both objects are files, then we're in the same boat.
211        #
212        if typelhs == "dir" or (typelhs == "file" and typerhs == "file"):
213            return lhs.mode != rhs.mode
214
215        #
216        # For files or hardlinks:
217        #
218        # Since the key space is different (inodes for real files and
219        # actual link targets for hard links), and since the proto area will
220        # identify all N occurrences as hardlinks, but the manifests as one
221        # file and N-1 hardlinks, we have to compare files to hardlinks.
222        #
223
224        #
225        # If they're both hardlinks, we just make sure that
226        # the same target path appears in both sets of
227        # possible targets.
228        #
229        if typelhs == "hardlink" and typerhs == "hardlink":
230            return len(lhs.hardpaths.intersection(rhs.hardpaths)) == 0
231
232        #
233        # Otherwise, we have a mix of file and hardlink, so we
234        # need to make sure that the file path appears in the
235        # set of possible target paths for the hardlink.
236        #
237        # We already know that the ActionInfo, if present, is the lhs
238        # operator.  So it's the rhs operator that's guaranteed to
239        # have a set of hardpaths.
240        #
241        return lhs.path not in rhs.hardpaths
242
243    def __str__(self):
244        """Return an action-style representation of a FileInfo object.
245
246        We don't currently quote items with embedded spaces.  If we
247        ever decide to parse this output, we'll want to revisit that.
248        """
249        name = self.name()
250        out = name
251
252        for member, label in OUTPUTMAP[name]:
253            out += " " + label + str(getattr(self, member))
254
255        return out
256
257    def protostr(self):
258        """Return a protolist-style representation of a FileInfo object.
259        """
260        target = "-"
261        major = "-"
262        minor = "-"
263
264        mode = self.mode
265        owner = self.owner
266        group = self.group
267
268        name = self.name()
269        if name == "dir":
270            ftype = "d"
271        elif name in ("file", "hardlink"):
272            ftype = "f"
273        elif name == "link":
274            ftype = "s"
275            target = self.target
276            mode = "777"
277            owner = "root"
278            group = "other"
279
280        out = "%c %-30s %-20s %4s %-5s %-5s %6d %2ld  -  -" % \
281            (ftype, self.path, target, mode, owner, group, 0, 1)
282
283        return out
284
285
286class ActionInfo(FileInfo):
287    """Object to track information about manifest actions.
288
289    This currently understands file, link, dir, and hardlink actions.
290    """
291
292    def __init__(self, action):
293        FileInfo.__init__(self)
294        #
295        # Currently, all actions that we support have a "path"
296        # attribute.  If that changes, then we'll need to
297        # catch a KeyError from this assignment.
298        #
299        self.path = action.attrs["path"]
300
301        if action.name == "file":
302            self.owner = action.attrs["owner"]
303            self.group = action.attrs["group"]
304            self.mode = action.attrs["mode"]
305            self.hash = action.hash
306            if "preserve" in action.attrs:
307                self.editable = True
308        elif action.name == "link":
309            target = action.attrs["target"]
310            self.target = os.path.normpath(target)
311            self.mediator = action.attrs.get("mediator")
312        elif action.name == "dir":
313            self.owner = action.attrs["owner"]
314            self.group = action.attrs["group"]
315            self.mode = action.attrs["mode"]
316            self.isdir = True
317        elif action.name == "hardlink":
318            target = os.path.normpath(action.get_target_path())
319            self.hardkey = target
320            self.hardpaths.add(target)
321
322    @staticmethod
323    def supported(action):
324        """Indicates whether the specified IPS action time is
325        correctly handled by the ActionInfo constructor.
326        """
327        return action in frozenset(("file", "dir", "link", "hardlink"))
328
329
330class UnsupportedFileFormatError(Exception):
331    """This means that the stat.S_IFMT returned something we don't
332    support, ie a pipe or socket.  If it's appropriate for such an
333    object to be in the proto area, then the RealFileInfo constructor
334    will need to evolve to support it, or it will need to be in the
335    exception list.
336    """
337    def __init__(self, path, mode):
338        Exception.__init__(self)
339        self.path = path
340        self.mode = mode
341
342    def __str__(self):
343        return '%s: unsupported S_IFMT %07o' % (self.path, self.mode)
344
345
346class RealFileInfo(FileInfo):
347    """Object to track important-to-packaging file information.
348
349    This currently handles regular files, directories, and symbolic links.
350
351    For multiple RealFileInfo objects with identical hardkeys, there
352    is no way to determine which of the hard links should be
353    delivered as a file, and which as hardlinks.
354    """
355
356    def __init__(self, root=None, path=None):
357        FileInfo.__init__(self)
358        self.path = path
359        path = os.path.join(root, path)
360        lstat = os.lstat(path)
361        mode = lstat.st_mode
362
363        #
364        # Per stat.py, these cases are mutually exclusive.
365        #
366        if stat.S_ISREG(mode):
367            self.hash = self.path
368        elif stat.S_ISDIR(mode):
369            self.isdir = True
370        elif stat.S_ISLNK(mode):
371            self.target = os.path.normpath(os.readlink(path))
372            self.mediator = None
373        else:
374            raise UnsupportedFileFormatError(path, mode)
375
376        if not stat.S_ISLNK(mode):
377            self.mode = "%04o" % stat.S_IMODE(mode)
378            #
379            # Instead of reading the group and owner from the proto area after
380            # a non-root build, just drop in dummy values.  Since we don't
381            # compare them anywhere, this should allow at least marginally
382            # useful comparisons of protolist-style output.
383            #
384            self.owner = "owner"
385            self.group = "group"
386
387        #
388        # refcount > 1 indicates a hard link
389        #
390        if lstat.st_nlink > 1:
391            #
392            # This could get ugly if multiple proto areas reside
393            # on different filesystems.
394            #
395            self.hardkey = lstat.st_ino
396
397
398class DirectoryTree(dict):
399    """Meant to be subclassed according to population method.
400    """
401    def __init__(self, name):
402        dict.__init__(self)
403        self.name = name
404
405    def compare(self, other):
406        """Compare two different sets of FileInfo objects.
407        """
408        keys1 = frozenset(self.keys())
409        keys2 = frozenset(other.keys())
410
411        common = keys1.intersection(keys2)
412        onlykeys1 = keys1.difference(common)
413        onlykeys2 = keys2.difference(common)
414
415        if onlykeys1:
416            print "Entries present in %s but not %s:" % \
417                (self.name, other.name)
418            for path in sorted(onlykeys1):
419                print("\t%s" % str(self[path]))
420            print ""
421
422        if onlykeys2:
423            print "Entries present in %s but not %s:" % \
424                (other.name, self.name)
425            for path in sorted(onlykeys2):
426                print("\t%s" % str(other[path]))
427            print ""
428
429        nodifferences = True
430        for path in sorted(common):
431            if self[path] != other[path]:
432                if nodifferences:
433                    nodifferences = False
434                    print "Entries that differ between %s and %s:" \
435                        % (self.name, other.name)
436                print("%14s %s" % (self.name, self[path]))
437                print("%14s %s" % (other.name, other[path]))
438        if not nodifferences:
439            print ""
440
441
442class BadProtolistFormat(Exception):
443    """This means that the user supplied a file via -l, but at least
444    one line from that file doesn't have the right number of fields to
445    parse as protolist output.
446    """
447    def __str__(self):
448        return 'bad proto list entry: "%s"' % Exception.__str__(self)
449
450
451class ProtoTree(DirectoryTree):
452    """Describes one or more proto directories as a dictionary of
453    RealFileInfo objects, indexed by relative path.
454    """
455
456    def adddir(self, proto, exceptions):
457        """Extends the ProtoTree dictionary with RealFileInfo
458        objects describing the proto dir, indexed by relative
459        path.
460        """
461        newentries = {}
462
463        pdir = os.path.normpath(proto)
464        strippdir = lambda r, n: os.path.join(r, n)[len(pdir)+1:]
465        for root, dirs, files in os.walk(pdir):
466            for name in dirs + files:
467                path = strippdir(root, name)
468                if path not in exceptions:
469                    try:
470                        newentries[path] = RealFileInfo(pdir, path)
471                    except OSError, e:
472                        sys.stderr.write("Warning: unable to stat %s: %s\n" %
473                            (path, e))
474                        continue
475                else:
476                    exceptions.remove(path)
477                    if name in dirs:
478                        dirs.remove(name)
479
480        #
481        # Find the sets of paths in this proto dir that are hardlinks
482        # to the same inode.
483        #
484        # It seems wasteful to store this in each FileInfo, but we
485        # otherwise need a linking mechanism.  With this information
486        # here, FileInfo object comparison can be self contained.
487        #
488        # We limit this aggregation to a single proto dir, as
489        # represented by newentries.  That means we don't need to care
490        # about proto dirs on separate filesystems, or about hardlinks
491        # that cross proto dir boundaries.
492        #
493        hk2path = {}
494        for path, fileinfo in newentries.iteritems():
495            if fileinfo.hardkey:
496                hk2path.setdefault(fileinfo.hardkey, set()).add(path)
497        for fileinfo in newentries.itervalues():
498            if fileinfo.hardkey:
499                fileinfo.hardpaths.update(hk2path[fileinfo.hardkey])
500        self.update(newentries)
501
502    def addprotolist(self, protolist, exceptions):
503        """Read in the specified file, assumed to be the
504        output of protolist.
505
506        This has been tested minimally, and is potentially useful for
507        comparing across the transition period, but should ultimately
508        go away.
509        """
510
511        try:
512            plist = open(protolist)
513        except IOError, exc:
514            raise IOError("cannot open proto list: %s" % str(exc))
515
516        newentries = {}
517
518        for pline in plist:
519            pline = pline.split()
520            #
521            # Use a FileInfo() object instead of a RealFileInfo()
522            # object because we want to avoid the RealFileInfo
523            # constructor, because there's nothing to actually stat().
524            #
525            fileinfo = FileInfo()
526            try:
527                if pline[1] in exceptions:
528                    exceptions.remove(pline[1])
529                    continue
530                if pline[0] == "d":
531                    fileinfo.isdir = True
532                fileinfo.path = pline[1]
533                if pline[2] != "-":
534                    fileinfo.target = os.path.normpath(pline[2])
535                fileinfo.mode = int("0%s" % pline[3])
536                fileinfo.owner = pline[4]
537                fileinfo.group = pline[5]
538                if pline[6] != "0":
539                    fileinfo.hardkey = pline[6]
540                newentries[pline[1]] = fileinfo
541            except IndexError:
542                raise BadProtolistFormat(pline)
543
544        plist.close()
545        hk2path = {}
546        for path, fileinfo in newentries.iteritems():
547            if fileinfo.hardkey:
548                hk2path.setdefault(fileinfo.hardkey, set()).add(path)
549        for fileinfo in newentries.itervalues():
550            if fileinfo.hardkey:
551                fileinfo.hardpaths.update(hk2path[fileinfo.hardkey])
552        self.update(newentries)
553
554
555class ManifestParsingError(Exception):
556    """This means that the Manifest.set_content() raised an
557    ActionError.  We raise this, instead, to tell us which manifest
558    could not be parsed, rather than what action error we hit.
559    """
560    def __init__(self, mfile, error):
561        Exception.__init__(self)
562        self.mfile = mfile
563        self.error = error
564
565    def __str__(self):
566        return "unable to parse manifest %s: %s" % (self.mfile, self.error)
567
568
569class ManifestTree(DirectoryTree):
570    """Describes one or more directories containing arbitrarily
571    many manifests as a dictionary of ActionInfo objects, indexed
572    by the relative path of the data source within the proto area.
573    That path may or may not be the same as the path attribute of the
574    given action.
575    """
576
577    def addmanifest(self, root, mfile, arch, modechecks, exceptions):
578        """Treats the specified input file as a pkg(5) package
579        manifest, and extends the ManifestTree dictionary with entries
580        for the actions therein.
581        """
582        mfest = manifest.Manifest()
583        try:
584            mfest.set_content(open(os.path.join(root, mfile)).read())
585        except IOError, exc:
586            raise IOError("cannot read manifest: %s" % str(exc))
587        except actions.ActionError, exc:
588            raise ManifestParsingError(mfile, str(exc))
589
590        #
591        # Make sure the manifest is applicable to the user-specified
592        # architecture.  Assumption: if variant.arch is not an
593        # attribute of the manifest, then the package should be
594        # installed on all architectures.
595        #
596        if arch not in mfest.attributes.get("variant.arch", (arch,)):
597            return
598
599        modewarnings = set()
600        for action in mfest.gen_actions():
601            if "path" not in action.attrs or \
602                not ActionInfo.supported(action.name):
603                continue
604
605            #
606            # The dir action is currently fully specified, in that it
607            # lists owner, group, and mode attributes.  If that
608            # changes in pkg(5) code, we'll need to revisit either this
609            # code or the ActionInfo() constructor.  It's possible
610            # that the pkg(5) system could be extended to provide a
611            # mechanism for specifying directory permissions outside
612            # of the individual manifests that deliver files into
613            # those directories.  Doing so at time of manifest
614            # processing would mean that validate_pkg continues to work,
615            # but doing so at time of publication would require updates.
616            #
617
618            #
619            # See pkgsend(1) for the use of NOHASH for objects with
620            # datastreams.  Currently, that means "files," but this
621            # should work for any other such actions.
622            #
623            if getattr(action, "hash", "NOHASH") != "NOHASH":
624                path = action.hash
625            else:
626                path = action.attrs["path"]
627
628            #
629            # This is the wrong tool in which to enforce consistency
630            # on a set of manifests.  So instead of comparing the
631            # different actions with the same "path" attribute, we
632            # use the first one.
633            #
634            if path in self:
635                continue
636
637            #
638            # As with the manifest itself, if an action has specified
639            # variant.arch, we look for the target architecture
640            # therein.
641            #
642            var = None
643
644            #
645            # The name of this method changed in pkg(5) build 150, we need to
646            # work with both sets.
647            #
648            if hasattr(action, 'get_variants'):
649                var = action.get_variants()
650            else:
651                var = action.get_variant_template()
652            if "variant.arch" in var and arch not in var["variant.arch"]:
653                return
654
655            self[path] = ActionInfo(action)
656            if modechecks is not None and path not in exceptions:
657                modewarnings.update(self[path].checkmodes(modechecks))
658
659        if len(modewarnings) > 0:
660            print "warning: unsafe permissions in %s" % mfile
661            for w in sorted(modewarnings):
662                print w
663            print ""
664
665    def adddir(self, mdir, arch, modechecks, exceptions):
666        """Walks the specified directory looking for pkg(5) manifests.
667        """
668        for mfile in os.listdir(mdir):
669            if (mfile.endswith(".mog") and
670                stat.S_ISREG(os.lstat(os.path.join(mdir, mfile)).st_mode)):
671                try:
672                    self.addmanifest(mdir, mfile, arch, modechecks, exceptions)
673                except IOError, exc:
674                    sys.stderr.write("warning: %s\n" % str(exc))
675
676    def resolvehardlinks(self):
677        """Populates mode, group, and owner for resolved (ie link target
678        is present in the manifest tree) hard links.
679        """
680        for info in self.values():
681            if info.name() == "hardlink":
682                tgt = info.hardkey
683                if tgt in self:
684                    tgtinfo = self[tgt]
685                    info.owner = tgtinfo.owner
686                    info.group = tgtinfo.group
687                    info.mode = tgtinfo.mode
688
689class ExceptionList(set):
690    """Keep track of an exception list as a set of paths to be excluded
691    from any other lists we build.
692    """
693
694    def __init__(self, files, arch):
695        set.__init__(self)
696        for fname in files:
697            try:
698                self.readexceptionfile(fname, arch)
699            except IOError, exc:
700                sys.stderr.write("warning: cannot read exception file: %s\n" %
701                    str(exc))
702
703    def readexceptionfile(self, efile, arch):
704        """Build a list of all pathnames from the specified file that
705        either apply to all architectures (ie which have no trailing
706        architecture tokens), or to the specified architecture (ie
707        which have the value of the arch arg as a trailing
708        architecture token.)
709        """
710
711        excfile = open(efile)
712
713        for exc in excfile:
714            exc = exc.split()
715            if len(exc) and exc[0][0] != "#":
716                if arch in (exc[1:] or arch):
717                    self.add(os.path.normpath(exc[0]))
718
719        excfile.close()
720
721
722USAGE = """%s [-v] -a arch [-e exceptionfile]... [-L|-M [-X check]...] input_1 [input_2]
723
724where input_1 and input_2 may specify proto lists, proto areas,
725or manifest directories.  For proto lists, use one or more
726
727    -l file
728
729arguments.  For proto areas, use one or more
730
731    -p dir
732
733arguments.  For manifest directories, use one or more
734
735    -m dir
736
737arguments.
738
739If -L or -M is specified, then only one input source is allowed, and
740it should be one or more manifest directories.  These two options are
741mutually exclusive.
742
743The -L option is used to generate a proto list to stdout.
744
745The -M option is used to check for safe file and directory modes.
746By default, this causes all mode checks to be performed.  Individual
747mode checks may be turned off using "-X check," where "check" comes
748from the following set of checks:
749
750    m   check for group or other write permissions
751    w   check for user write permissions on files and directories
752        not owned by root
753    s   check for group/other read permission on executable files
754        that have setuid/setgid bit(s)
755    o   check for files that could be safely owned by root
756""" % sys.argv[0]
757
758
759def usage(msg=None):
760    """Try to give the user useful information when they don't get the
761    command syntax right.
762    """
763    if msg:
764        sys.stderr.write("%s: %s\n" % (sys.argv[0], msg))
765    sys.stderr.write(USAGE)
766    sys.exit(2)
767
768
769def main(argv):
770    """Compares two out of three possible data sources: a proto list, a
771    set of proto areas, and a set of manifests.
772    """
773    try:
774        opts, args = getopt.getopt(argv, 'a:e:Ll:Mm:p:vX:')
775    except getopt.GetoptError, exc:
776        usage(str(exc))
777
778    if args:
779        usage()
780
781    arch = None
782    exceptionlists = []
783    listonly = False
784    manifestdirs = []
785    manifesttree = ManifestTree("manifests")
786    protodirs = []
787    prototree = ProtoTree("proto area")
788    protolists = []
789    protolist = ProtoTree("proto list")
790    modechecks = set()
791    togglemodechecks = set()
792    trees = []
793    comparing = set()
794    verbose = False
795
796    for opt, arg in opts:
797        if opt == "-a":
798            if arch:
799                usage("may only specify one architecture")
800            else:
801                arch = arg
802        elif opt == "-e":
803            exceptionlists.append(arg)
804        elif opt == "-L":
805            listonly = True
806        elif opt == "-l":
807            comparing.add("protolist")
808            protolists.append(os.path.normpath(arg))
809        elif opt == "-M":
810            modechecks.update(DEFAULTMODECHECKS)
811        elif opt == "-m":
812            comparing.add("manifests")
813            manifestdirs.append(os.path.normpath(arg))
814        elif opt == "-p":
815            comparing.add("proto area")
816            protodirs.append(os.path.normpath(arg))
817        elif opt == "-v":
818            verbose = True
819        elif opt == "-X":
820            togglemodechecks.add(arg)
821
822    if listonly or len(modechecks) > 0:
823        if len(comparing) != 1 or "manifests" not in comparing:
824            usage("-L and -M require one or more -m args, and no -l or -p")
825        if listonly and len(modechecks) > 0:
826            usage("-L and -M are mutually exclusive")
827    elif len(comparing) != 2:
828        usage("must specify exactly two of -l, -m, and -p")
829
830    if len(togglemodechecks) > 0 and len(modechecks) == 0:
831        usage("-X requires -M")
832
833    for s in togglemodechecks:
834        if s not in ALLMODECHECKS:
835            usage("unknown mode check %s" % s)
836        modechecks.symmetric_difference_update((s))
837
838    if len(modechecks) == 0:
839        modechecks = None
840
841    if not arch:
842        usage("must specify architecture")
843
844    exceptions = ExceptionList(exceptionlists, arch)
845    originalexceptions = exceptions.copy()
846
847    if len(manifestdirs) > 0:
848        for mdir in manifestdirs:
849            manifesttree.adddir(mdir, arch, modechecks, exceptions)
850        if listonly:
851            manifesttree.resolvehardlinks()
852            for info in manifesttree.values():
853                print "%s" % info.protostr()
854            sys.exit(0)
855        if modechecks is not None:
856            sys.exit(0)
857        trees.append(manifesttree)
858
859    if len(protodirs) > 0:
860        for pdir in protodirs:
861            prototree.adddir(pdir, exceptions)
862        trees.append(prototree)
863
864    if len(protolists) > 0:
865        for plist in protolists:
866            try:
867                protolist.addprotolist(plist, exceptions)
868            except IOError, exc:
869                sys.stderr.write("warning: %s\n" % str(exc))
870        trees.append(protolist)
871
872    if verbose and exceptions:
873        print "Entries present in exception list but missing from proto area:"
874        for exc in sorted(exceptions):
875            print "\t%s" % exc
876        print ""
877
878    usedexceptions = originalexceptions.difference(exceptions)
879    harmfulexceptions = usedexceptions.intersection(manifesttree)
880    if harmfulexceptions:
881        print "Entries present in exception list but also in manifests:"
882        for exc in sorted(harmfulexceptions):
883            print "\t%s" % exc
884            del manifesttree[exc]
885        print ""
886
887    trees[0].compare(trees[1])
888
889if __name__ == '__main__':
890    try:
891        main(sys.argv[1:])
892    except KeyboardInterrupt:
893        sys.exit(1)
894    except IOError:
895        sys.exit(1)
896