tools: Switch some scripts exclusively to Python 3.

Convert asn2wrs.py to Python 3 via `2to3 --print-function --write` along
with additional tweaks.

Convert asn2deb and idl2deb using `2to3 --write`.

Work around what appears to be a Debian packaging bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=818609

Change-Id: I5cc246f7162c2d713673955c10c092e1b91adf82
Reviewed-on: https://code.wireshark.org/review/33504
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

debian/control

@@ -84,7 +84,7 @@ Package: wireshark-dev
 Architecture: any
 Section: devel
 Depends: ${misc:Depends}, omniidl (>= 4.0.1-2), libpcap0.8-dev, libtool,
- libglib2.0-dev, ${python3:Depends}, python3-ply, snacc, debhelper,
+ libglib2.0-dev, python3:any, python3-ply, snacc, debhelper,
  cdbs, libwireshark-dev, libwiretap-dev
 Replaces: ethereal-dev (<< 1.0.0-3)
 Conflicts: ethereal-dev (<< 1.0.0-3)

tools/asn2deb

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # asn2deb - quick hack by W. Borgert <debacle@debian.org> to create
 # Debian GNU/Linux packages from ASN.1 files for Wireshark.
@@ -54,7 +54,7 @@ PREFIX=`pwd`/debian/wireshark-asn1-%s
 
 binary-post-install/wireshark-asn1-%s::
 	rm -f $(PREFIX)/usr/lib/wireshark/plugins/%s/*.a
-""" % (base, base, version), 0755)
+""" % (base, base, version), 0o755)
 
     create_file("debian/control", """Source: wireshark-asn1-%s
 Section: net
@@ -152,18 +152,18 @@ def process_opts(argv):
         usage(argv[0])
         sys.exit(0)
     if options['version']:
-        print scriptinfo
+        print(scriptinfo)
         sys.exit(0)
     if not options['asn']:
-        print "mandatory ASN.1 file parameter missing"
+        print("mandatory ASN.1 file parameter missing")
         sys.exit(1)
     if not os.access(options['asn'], os.R_OK):
-        print "ASN.1 file not accessible"
+        print("ASN.1 file not accessible")
         sys.exit(1)
 
 def usage(name):
     """Print usage help."""
-    print "Usage: " + name + " <parameters>\n" + \
+    print("Usage: " + name + " <parameters>\n" + \
           "Parameters are\n" + \
           "  --asn      -a asn1file, ASN.1 file to use (mandatory)\n" + \
           "  --dbopts   -d opts,     options for dpkg-buildpackage\n" + \
@@ -174,6 +174,6 @@ def usage(name):
           "  --version  -v,          print version and exit\n" + \
           "Example:\n" + \
           name + " -e me@foo.net -a bar.asn1 -n \"My Name\" " + \
-          "-d \"-rfakeroot -uc -us\""
+          "-d \"-rfakeroot -uc -us\"")
 if __name__ == '__main__':
     main()

tools/asn2wrs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 #
 # asn2wrs.py
@@ -2034,10 +2034,10 @@ class EthCtx:
             for a in self.assign_ord:
                 v = ' '
                 if (self.assign[a]['virt']): v = '*'
-                print(v, a)
+                print('{} {}'.format(v, a))
             print("\n# Value assignments")
             for a in self.vassign_ord:
-                print(' ', a)
+                print(' {}'.format(a))
             print("\n# Information object assignments")
             for a in self.oassign_ord:
                 print(" %-12s (%s)" % (a, self.oassign[a].cls))
@@ -8068,10 +8068,14 @@ def eth_main():
 
 # Python compiler
 def main():
+    if sys.version_info[0] < 3:
+        print("This requires Python 3")
+        sys.exit(2)
+
     testfn = testyacc
     if len (sys.argv) == 1:
         while True:
-            s = input ('Query: ')
+            s = eval(input ('Query: '))
             if len (s) == 0:
                 break
             testfn (s, 'console', {})

tools/idl2deb

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # idl2deb - quick hack by W. Martin Borgert <debacle@debian.org> to create
 # Debian GNU/Linux packages from idl2wrs modules for Wireshark.
@@ -46,7 +46,7 @@ PREFIX=`pwd`/debian/wireshark-giop-%s
 
 binary-post-install/wireshark-giop-%s::
 	rm -f $(PREFIX)/usr/lib/wireshark/plugins/%s/*.a
-""" % (base, base, version), 0755)
+""" % (base, base, version), 0o755)
 
     create_file(preserve, "debian/control", """Source: wireshark-giop-%s
 Section: net
@@ -130,10 +130,10 @@ def process_opts(argv):
                       help="do not overwrite files")
     opts, args = parser.parse_args()
     if not opts.idl:
-        print "mandatory IDL file parameter missing"
+        print("mandatory IDL file parameter missing")
         sys.exit(1)
     if not os.access(opts.idl, os.R_OK):
-        print "IDL file not accessible"
+        print("IDL file not accessible")
         sys.exit(1)
     return opts