git-p4.py: support Python 2.4

Python 2.4 lacks the following features:

   subprocess.check_call
   struct.pack_into

Take a cue from 460d1026 and provide an implementation of the
CalledProcessError exception.  Then replace the calls to
subproccess.check_call with calls to subprocess.call that check the return
status and raise a CalledProcessError exception if necessary.

The struct.pack_into in t/9802 can be converted into a single struct.pack
call which is available in Python 2.4.

Signed-off-by: Brandon Casey <bcasey@nvidia.com>
Acked-by: Pete Wyckoff <pw@padd.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/INSTALL b/INSTALL
index fc723b3e7f8be1efcedd254def349a3c6b78d225..b96e16d6c19b6d7b7efdcbb21574230218d157e7 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -131,7 +131,7 @@ Issues of note:
          use English. Under autoconf the configure script will do this
          automatically if it can't find libintl on the system.
 
-       - Python version 2.5 or later is needed to use the git-p4
+       - Python version 2.4 or later is needed to use the git-p4
          interface to Perforce.
 
  - Some platform specific issues are dealt with Makefile rules,

diff --git a/git-p4.py b/git-p4.py
index a041b49818bff474a866514b7de8bcca7a5e7f0f..0682e61e90dca3f88f399c20aa19c5336274bc95 100755 (executable)
--- a/git-p4.py
+++ b/git-p4.py
@@ -12,6 +12,21 @@ import optparse, sys, os, marshal, subprocess, shelve
 import tempfile, getopt, os.path, time, platform
 import re, shutil
 
+try:
+    from subprocess import CalledProcessError
+except ImportError:
+    # from python2.7:subprocess.py
+    # Exception classes used by this module.
+    class CalledProcessError(Exception):
+        """This exception is raised when a process run by check_call() returns
+        a non-zero exit status.  The exit status will be stored in the
+        returncode attribute."""
+        def __init__(self, returncode, cmd):
+            self.returncode = returncode
+            self.cmd = cmd
+        def __str__(self):
+            return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)
+
 verbose = False
 
 # Only labels/tags matching this will be imported/exported
@@ -152,13 +167,17 @@ def system(cmd):
     expand = isinstance(cmd,basestring)
     if verbose:
         sys.stderr.write("executing %s\n" % str(cmd))
-    subprocess.check_call(cmd, shell=expand)
+    retcode = subprocess.call(cmd, shell=expand)
+    if retcode:
+        raise CalledProcessError(retcode, cmd)
 
 def p4_system(cmd):
     """Specifically invoke p4 as the system command. """
     real_cmd = p4_build_cmd(cmd)
     expand = isinstance(real_cmd, basestring)
-    subprocess.check_call(real_cmd, shell=expand)
+    retcode = subprocess.call(real_cmd, shell=expand)
+    if retcode:
+        raise CalledProcessError(retcode, real_cmd)
 
 def p4_integrate(src, dest):
     p4_system(["integrate", "-Dt", wildcard_encode(src), wildcard_encode(dest)])
@@ -3104,7 +3123,9 @@ class P4Clone(P4Sync):
         init_cmd = [ "git", "init" ]
         if self.cloneBare:
             init_cmd.append("--bare")
-        subprocess.check_call(init_cmd)
+        retcode = subprocess.call(init_cmd)
+        if retcode:
+            raise CalledProcessError(retcode, init_cmd)
 
         if not P4Sync.run(self, depotPaths):
             return False

diff --git a/t/t9802-git-p4-filetype.sh b/t/t9802-git-p4-filetype.sh
index 21924dfd7db4fd5b8c0eb2c2823580ae33e73cc1..aae1a3f816eb0f57f84053d74246a8db7d7529d8 100755 (executable)
--- a/t/t9802-git-p4-filetype.sh
+++ b/t/t9802-git-p4-filetype.sh
@@ -105,12 +105,13 @@ build_gendouble() {
        cat >gendouble.py <<-\EOF
        import sys
        import struct
-       import array
 
-       s = array.array("c", '\0' * 26)
-       struct.pack_into(">L", s,  0, 0x00051607)  # AppleDouble
-       struct.pack_into(">L", s,  4, 0x00020000)  # version 2
-       s.tofile(sys.stdout)
+       s = struct.pack(">LL18s",
+                       0x00051607,  # AppleDouble
+                       0x00020000,  # version 2
+                       ""           # pad to 26 bytes
+       )
+       sys.stdout.write(s)
        EOF
 }