如何解析Perforce"pickle"二进制输出？

Question

Perforce命令行有一个特殊的开关-G,它可以使用python的"pickle"序列化格式使其输出成为机器可读的.一般来说,这实际上是这样吗？

例如,考虑输出p4 -G diff -duw3 <file1> <file2> <file3>.据我所知,输出是一系列:pickle,raw diff,pickle,raw diff,pickle,raw diff.它似乎不包含任何能够使人们可靠地定位pickle/diff边界的分隔符.

我错过了什么,或者这种"机器可读"格式实际上不是机器可读的吗？如何在输出中找到泡菜和原始差异之间的界限？

Answer 1

p4 -G以marshaled形式输出其数据而不是腌制.

但你是对的 - p4 -G diff -duw3也不会联合国marshal,所以我猜那里有一个问题.

p4 -G opened然而,unmarshals罚款.然而,任何一种diff失败.

以下是相关知识库文章:http://kb.perforce.com/ToolsScripts/PerforceUtilities/UsingP4G

#!/usr/bin/env python
import marshal
import subprocess

# proc = subprocess.Popen(["p4","-G","diff","-duw3","configure.ac","Makefile.am"],stdout=subprocess.PIPE)
proc = subprocess.Popen(["p4","-G","diff"],stdout=subprocess.PIPE)
# proc = subprocess.Popen(["p4","-G","opened"],stdout=subprocess.PIPE)
pipe = proc.stdout
output = []
try:
    while 1:
        record = marshal.load(pipe)
        output.append(record)
except EOFError:
    pass
pipe.close()
proc.wait()

# print list of dictionary records
c = 0
for dict in output:
    c = c + 1
    print "\n--%d--" % c
    for key in dict.keys():
        print "%s: %s" % ( key, dict[key] )