updating python apps for pep8

1 files changed, 87 insertions, 84 deletions

diff --git a/scripts/revdep-pax b/scripts/revdep-pax
index b919dbf..ebdea9c 100755
--- a/scripts/revdep-pax
+++ b/scripts/revdep-pax
@@ -23,14 +23,14 @@
 # information we need generated by scanelf during emerge.
 #
 # See /usr/lib/portage/bin/misc-functions.sh ~line 520
-# echo "${arch:3};${obj};${soname};${rpath};${needed}" >> "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2
+# echo "${arch:3};${obj};${soname};${rpath};${needed}" >> \
+# "${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2
 #
 
 import getopt
 import os
 import sys
 import pax
-
 import re
 import portage
 
@@ -66,11 +66,10 @@ class LinkMap:
 
         for pkg in vardb.cpv_all():
             needed = vardb.aux_get(pkg, ['NEEDED.ELF.2'])[0].strip()
-            if needed: # Some packages have no NEEDED.ELF.2
+            if needed:  # Some packages have no NEEDED.ELF.2
                 self.pkgs.append(pkg)
                 for line in re.split('\n', needed):
-                    self.pkgs_needed.setdefault(pkg,[]).append(re.split(';', line))
-
+                    self.pkgs_needed.setdefault(pkg, []).append(re.split(';', line))
 
     def get_object_needed(self):
         """ Return object_needed dictionary which has structure
@@ -91,11 +90,10 @@ class LinkMap:
                 abi = link[0]
                 elf = link[1]
                 sonames = re.split(',', link[4])
-                object_needed.setdefault(abi,{}).update({elf:sonames})
+                object_needed.setdefault(abi, {}).update({elf: sonames})
 
         return object_needed
 
-
     def get_libraries(self):
         """ Return library2soname dictionary which has structure
 
@@ -113,14 +111,13 @@ class LinkMap:
                 abi = link[0]
                 elf = link[1]
                 soname = link[2]
-                if soname:                               #no soname => executable
-                    library2soname[elf] = (soname,abi)
-                    soname2library[(soname,abi)] = elf
-
-        return ( library2soname, soname2library )
+                if soname:  # no soname => executable
+                    library2soname[elf] = (soname, abi)
+                    soname2library[(soname, abi)] = elf
 
+        return library2soname, soname2library
 
-    def get_soname_needed(self, object_needed, library2soname ):
+    def get_soname_needed(self, object_needed, library2soname):
         """ Return soname_needed dictionary which has structure:
 
             {
@@ -137,14 +134,14 @@ class LinkMap:
             for elf in object_needed[abi]:
                 try:
                     (soname, abi_check) = library2soname[elf]
-                    assert abi == abi_check # We should get the same abi associated with the soname
-                    soname_needed.setdefault(abi,{}).update({soname:object_needed[abi][elf]})
+                    # We should get the same abi associated with the soname
+                    assert abi == abi_check
+                    soname_needed.setdefault(abi, {}).update({soname: object_needed[abi][elf]})
                 except KeyError:
                     continue  # no soname, its probably an executable
 
         return soname_needed
 
-
     def expand_linkings(self, object_needed, soname2library):
         """ Expands the object_needed dictionary which has structure
 
@@ -162,27 +159,32 @@ class LinkMap:
             for elf in object_needed[abi]:
                 while True:
                     found_new_soname = False
-                    for so in object_needed[abi][elf]:                              # For all the first links ...
+                    # For all the first links ...
+                    for so in object_needed[abi][elf]:
                         try:
-                            for sn in object_needed[abi][soname2library[(so,abi)]]: # go to the next links ...
-                                if sn in object_needed[abi][elf]:                   # skip if already included ...
+                            # go to the next links ...
+                            for sn in object_needed[abi][soname2library[(so, abi)]]:
+                                # skip if already included ...
+                                if sn in object_needed[abi][elf]:
                                     continue
-                                if not (sn,abi) in soname2library:                  # skip if vdso ...
+                                # skip if vdso ...
+                                if not (sn, abi) in soname2library:
                                     continue
 
-                                # This appends to the object_needed and soname_needed lists.  No copy was
-                                # done so its the same lists in memory for both, and its modified for both.
+                        # This appends to the object_needed and soname_needed lists.  No copy was
+                        # done so its the same lists in memory for both, and its modified for both.
 
-                                object_needed[abi][elf].append(sn)                  # otherwise collapse it back into
-                                found_new_soname = True                             # first links of the chain.
+                                # otherwise collapse it back into
+                                object_needed[abi][elf].append(sn)
+                                # first links of the chain.
+                                found_new_soname = True
 
-                        except KeyError:                 # Not all nodes in the chain have a next node
+                        except KeyError:  # Not all nodes in the chain have a next node
                             continue
 
                     if not found_new_soname:             # We're done, that last iteration found
                         break                            # no new nodes
 
-
     def get_object_reverse_linkings(self, object_linkings):
         """ Return object_reverse_linkings dictionary which has structure
 
@@ -197,11 +199,10 @@ class LinkMap:
         for abi in object_linkings:
             for elf in object_linkings[abi]:
                 for soname in object_linkings[abi][elf]:
-                    object_reverse_linkings.setdefault(abi,{}).setdefault(soname,[]).append(elf)
+                    object_reverse_linkings.setdefault(abi, {}).setdefault(soname, []).append(elf)
 
         return object_reverse_linkings
 
-
     def get_maps(self):
         """ Generate the full forward and reverse links using the above functions """
 
@@ -209,18 +210,16 @@ class LinkMap:
         # soname_linkings are only one step into the entire link chain.
 
         object_linkings = self.get_object_needed()
-        ( library2soname, soname2library ) = self.get_libraries()
-        soname_linkings = self.get_soname_needed( object_linkings, library2soname )
+        (library2soname, soname2library) = self.get_libraries()
+        soname_linkings = self.get_soname_needed(object_linkings, library2soname)
 
         # After the appending in expand_linkings(), forward_linkings and soname_linkings
         # have been extended through the entire chain of linking.  expand_linkings() is
         # a "side-effect" function, so we note it here.
-        self.expand_linkings( soname_linkings, soname2library )
-        object_reverse_linkings = self.get_object_reverse_linkings( object_linkings )
-
-        return ( object_linkings, object_reverse_linkings, library2soname, soname2library )
-
+        self.expand_linkings(soname_linkings, soname2library)
+        object_reverse_linkings = self.get_object_reverse_linkings(object_linkings)
 
+        return object_linkings, object_reverse_linkings, library2soname, soname2library
 
 
 def print_problems(sonames_missing_library):
@@ -231,7 +230,8 @@ def print_problems(sonames_missing_library):
 
 
 def run_forward(verbose):
-    (object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
+    (object_linkings, object_reverse_linkings,
+     library2soname, soname2library) = LinkMap().get_maps()
 
     sonames_missing_library = []
 
@@ -257,7 +257,7 @@ def run_forward(verbose):
                     sv = '%s\n\t%s\t%s ( %s )' % (sv, soname, library, library_str_flags)
                     if elf_str_flags != library_str_flags:
                         s = '%s\n\t%s\t%s ( %s )' % (s, soname, library, library_str_flags)
-                        count = count + 1
+                        count += 1
                 except KeyError:
                     sonames_missing_library.append(soname)
 
@@ -276,9 +276,10 @@ def run_forward(verbose):
 
 
 def run_reverse(verbose, executable_only):
-    (object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
+    (object_linkings, object_reverse_linkings,
+     library2soname, soname2library) = LinkMap().get_maps()
 
-    shell_path = path = os.getenv('PATH').split(':')
+    shell_path = os.getenv('PATH').split(':')
 
     sonames_missing_library = []
 
@@ -306,12 +307,12 @@ def run_reverse(verbose, executable_only):
                         sv = '%s\n\t%s ( %s )' % (sv, elf, elf_str_flags)
                         if library_str_flags != elf_str_flags:
                             s = '%s\n\t%s ( %s )' % (s, elf, elf_str_flags)
-                            count = count + 1
+                            count += 1
                 else:
                     sv = '%s\n\t%s ( %s )' % (sv, elf, elf_str_flags)
                     if library_str_flags != elf_str_flags:
                         s = '%s\n\t%s ( %s )' % (s, elf, elf_str_flags)
-                        count = count + 1
+                        count += 1
 
             if verbose:
                 print('%s\n' % sv)
@@ -345,12 +346,12 @@ def migrate_flags(importer, exporter_str_flags, exporter_bin_flags):
 
     #See /usr/include/elf.h for these values
     pf_flags = {
-        'P':1<<4, 'p':1<<5,
-        'S':1<<6, 's':1<<7,
-        'M':1<<8, 'm':1<<9,
-        'X':1<<10, 'x':1<<11,
-        'E':1<<12, 'e':1<<13,
-        'R':1<<14, 'r':1<<15
+        'P': 1 << 4, 'p': 1 << 5,
+        'S': 1 << 6, 's': 1 << 7,
+        'M': 1 << 8, 'm': 1 << 9,
+        'X': 1 << 10, 'x': 1 << 11,
+        'E': 1 << 12, 'e': 1 << 13,
+        'R': 1 << 14, 'r': 1 << 15
     }
 
     try:
@@ -373,10 +374,10 @@ def migrate_flags(importer, exporter_str_flags, exporter_bin_flags):
             result_bin_flags = result_bin_flags ^ pf_flags[exporter_str_flags[i]]
             result_bin_flags = result_bin_flags | pf_flags[importer_str_flags[i]]
             print('\t\tWarning: %s has %s, refusing to set to %s' % (
-                importer, importer_str_flags[i], exporter_str_flags[i] )),
+                importer, importer_str_flags[i], exporter_str_flags[i])),
 
         # The exporter's flags is off, so use the importer's flag
-        if (exporter_str_flags[i] == '-' and importer_str_flags[i] != '-'):
+        if (exporter_str_flags[i] == '-') and (importer_str_flags[i] != '-'):
             result_bin_flags = result_bin_flags | pf_flags[importer_str_flags[i]]
 
     pax.setbinflags(importer, result_bin_flags)
@@ -394,16 +395,17 @@ def run_elf(elf, verbose, mark, allyes):
         print('%s: No PAX flags found\n' % elf)
         return
 
-    (object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
+    (object_linkings, object_reverse_linkings,
+     library2soname, soname2library) = LinkMap().get_maps()
 
     mismatched_libraries = []
 
     for abi in object_linkings:
-        if not elf in object_linkings[abi]: # There may be no elf for that abi
+        if not elf in object_linkings[abi]:  # There may be no elf for that abi
             continue
         for soname in object_linkings[abi][elf]:
             try:
-                library = soname2library[(soname,abi)]
+                library = soname2library[(soname, abi)]
                 try:
                     (library_str_flags, library_bin_flags) = pax.getflags(library)
                 except pax.PaxError:
@@ -444,7 +446,7 @@ def run_elf(elf, verbose, mark, allyes):
                         try:
                             migrate_flags(library, elf_str_flags, elf_bin_flags)
                         except pax.PaxError:
-                            print('\n\tCould not set PAX flags on %s, text maybe busy' % (library, abi))
+                            print('\n\tCould not set PAX flags on %s, text maybe busy' % library)
 
                         try:
                             (library_str_flags, library_bin_flags) = pax.getflags(library)
@@ -454,9 +456,10 @@ def run_elf(elf, verbose, mark, allyes):
 
 
 def run_soname(name, verbose, use_soname, mark, allyes, executable_only):
-    shell_path = path = os.getenv('PATH').split(':')
+    shell_path = os.getenv('PATH').split(':')
 
-    (object_linkings, object_reverse_linkings, library2soname, soname2library) = LinkMap().get_maps()
+    (object_linkings, object_reverse_linkings,
+     library2soname, soname2library) = LinkMap().get_maps()
 
     if use_soname:
         soname = name
@@ -476,7 +479,6 @@ def run_soname(name, verbose, use_soname, mark, allyes, executable_only):
             print('%s\tNo such LIBRARY' % name)
             return
 
-
     mismatched_elfs = []
 
     for abi in abi_list:
@@ -487,15 +489,15 @@ def run_soname(name, verbose, use_soname, mark, allyes, executable_only):
         library = soname2library[(soname, abi)]
 
         try:
-           (library_str_flags, library_bin_flags) = pax.getflags(library)
-           print('%s\t%s :%s (%s)\n' % (soname, library, abi, library_str_flags))
+            (library_str_flags, library_bin_flags) = pax.getflags(library)
+            print('%s\t%s :%s (%s)\n' % (soname, library, abi, library_str_flags))
         except pax.PaxError:
-           print('%s :%s : No PAX flags found\n' % (library, abi))
-           continue
+            print('%s :%s : No PAX flags found\n' % (library, abi))
+            continue
 
         for elf in object_reverse_linkings[abi][soname]:
             try:
-                (elf_str_flags, elf_bin_flags ) = pax.getflags(elf)
+                (elf_str_flags, elf_bin_flags) = pax.getflags(elf)
             except pax.PaxError:
                 elf_str_flags = '****'
             if verbose:
@@ -551,22 +553,23 @@ def run_soname(name, verbose, use_soname, mark, allyes, executable_only):
 
 
 def run_usage():
-    print('Package Name : elfix')
-    print('Bug Reports  : http://bugs.gentoo.org/')
-    print('Program Name : revdep-pax')
-    print('Description  : Get or set pax flags on an ELF object')
-    print('')
-    print('Usage        : revdep-pax -f [-v]             print out all forward mappings for all system ELF objects')
-    print('             : revdep-pax -r [-ve]            print out all reverse mappings for all system sonames')
-    print('             : revdep-pax -b OBJECT  [-myv]   print all forward mappings only for OBJECT')
-    print('             : revdep-pax -s SONAME  [-myve]  print all reverse mappings only for SONAME')
-    print('             : revdep-pax -l LIBRARY [-myve]  print all reverse mappings only for LIBRARY file')
-    print('             : revdep-pax [-h]                print out this help')
-    print('             : -v                             verbose, otherwise just print mismatching objects')
-    print('             : -e                             only print out executables in shell $PATH')
-    print('             : -m                             don\'t just report, but mark the mismatching objects')
-    print('             : -y                             assume "yes" to all prompts for marking (USE CAREFULLY!)')
-    print('')
+    usage = '''Package Name : elfix
+Bug Reports  : http://bugs.gentoo.org/
+Program Name : revdep-pax
+Description  : Get or set pax flags on an ELF object
+
+Usage        : revdep-pax -f [-v]             print all forward mappings for all system ELF objects
+             : revdep-pax -r [-ve]            print all reverse mappings for all system sonames
+             : revdep-pax -b OBJECT  [-myv]   print all forward mappings only for OBJECT
+             : revdep-pax -s SONAME  [-myve]  print all reverse mappings only for SONAME
+             : revdep-pax -l LIBRARY [-myve]  print all reverse mappings only for LIBRARY file
+             : revdep-pax [-h]                print this help
+             : -v                             verbose, otherwise just print mismatching objects
+             : -e                             only print executables in shell $PATH
+             : -m                             don\'t just report, but mark the mismatching objects
+             : -y                             assume "yes" to all prompts for marking (BE CAREFULL)
+'''
+    print(usage)
 
 
 def main():
@@ -579,7 +582,7 @@ def main():
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'hfrb:s:l:vemy')
     except getopt.GetoptError as err:
-        print(str(err)) # will print something like 'option -a not recognized'
+        print(str(err))  # will print something like 'option -a not recognized'
         run_usage()
         sys.exit(1)
 
@@ -587,12 +590,12 @@ def main():
         run_usage()
         sys.exit(1)
 
-    do_usage   = False
+    do_usage = False
     do_forward = False
     do_reverse = False
 
-    elf     = None
-    soname  = None
+    elf = None
+    soname = None
     library = None
 
     verbose = False
@@ -641,11 +644,11 @@ def main():
         run_forward(verbose)
     elif do_reverse:
         run_reverse(verbose, executable_only)
-    elif elf != None:
+    elif elf is not None:
         run_elf(elf, verbose, mark, allyes)
-    elif soname != None:
+    elif soname is not None:
         run_soname(soname, verbose, True, mark, allyes, executable_only)
-    elif library != None:
+    elif library is not None:
         library = os.path.realpath(library)
         run_soname(library, verbose, False, mark, allyes, executable_only)