Add checks to Python scripts for version dependencies.

Signed-off-by: Eric S. Raymond <esr@thyrsus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/ciabot/ciabot.py

@@ -47,7 +47,13 @@
 # we default to that.
 #
 
-import os, sys, commands, socket, urllib
+import sys
+if sys.hexversion < 0x02000000:
+        # The limiter is the xml.sax module
+        sys.stderr.write("ciabot.py: requires Python 2.0.0 or later.\n")
+        sys.exit(1)
+
+import os, commands, socket, urllib
 from xml.sax.saxutils import escape
 
 # Changeset URL prefix for your repo: when the commit ID is appended

contrib/fast-import/import-zips.py

@@ -9,10 +9,15 @@
 ##  git log --stat import-zips
 
 from os import popen, path
-from sys import argv, exit
+from sys import argv, exit, hexversion, stderr
 from time import mktime
 from zipfile import ZipFile
 
+if hexversion < 0x01060000:
+        # The limiter is the zipfile module
+        sys.stderr.write("import-zips.py: requires Python 1.6.0 or later.\n")
+        sys.exit(1)
+
 if len(argv) < 2:
 	print 'Usage:', argv[0], '<zipfile>...'
 	exit(1)

contrib/hg-to-git/hg-to-git.py

@@ -23,6 +23,11 @@ import os, os.path, sys
 import tempfile, pickle, getopt
 import re
 
+if sys.hexversion < 0x02030000:
+   # The behavior of the pickle module changed significantly in 2.3
+   sys.stderr.write("hg-to-git.py: requires Python 2.3 or later.\n")
+   sys.exit(1)
+
 # Maps hg version -> git version
 hgvers = {}
 # List of children for each hg revision

contrib/p4import/git-p4import.py

@@ -14,6 +14,11 @@ import sys
 import time
 import getopt
 
+if sys.hexversion < 0x02020000:
+   # The behavior of the marshal module changed significantly in 2.2
+   sys.stderr.write("git-p4import.py: requires Python 2.2 or later.\n")
+   sys.exit(1)
+
 from signal import signal, \
    SIGPIPE, SIGINT, SIG_DFL, \
    default_int_handler

contrib/svn-fe/svnrdump_sim.py

@@ -7,6 +7,10 @@ to the highest revision that should be available.
 """
 import sys, os
 
+if sys.hexversion < 0x02040000:
+        # The limiter is the ValueError() calls. This may be too conservative
+        sys.stderr.write("svnrdump-sim.py: requires Python 2.4 or later.\n")
+        sys.exit(1)
 
 def getrevlimit():
         var = 'SVNRMAX'

git-p4.py

@@ -8,7 +8,13 @@
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 #
 
-import optparse, sys, os, marshal, subprocess, shelve
+import sys
+if sys.hexversion < 0x02040000:
+    # The limiter is the subprocess module
+    sys.stderr.write("git-p4: requires Python 2.4 or later.\n")
+    sys.exit(1)
+
+import optparse, os, marshal, subprocess, shelve
 import tempfile, getopt, os.path, time, platform
 import re, shutil
 

git-remote-testgit.py

@@ -31,6 +31,11 @@ from git_remote_helpers.git.exporter import GitExporter
 from git_remote_helpers.git.importer import GitImporter
 from git_remote_helpers.git.non_local import NonLocalGit
 
+if sys.hexversion < 0x01050200:
+    # os.makedirs() is the limiter
+    sys.stderr.write("git-remote-testgit: requires Python 1.5.2 or later.\n")
+    sys.exit(1)
+
 def get_repo(alias, url):
     """Returns a git repository object initialized for usage.
     """

git_remote_helpers/git/__init__.py

@@ -0,0 +1,5 @@
+import sys
+if sys.hexversion < 0x02040000:
+    # The limiter is the subprocess module
+    sys.stderr.write("git_remote_helpers: requires Python 2.4 or later.\n")
+    sys.exit(1)