当我从使用Python zipfile
模块创建的ZIP文件中提取文件时,所有文件都不可写,只读等.
该文件是在Linux和Python 2.5.2下创建和提取的.
我可以说,我需要ZipInfo.external_attr
为每个文件设置属性,但这似乎没有记录在任何我能找到的地方,有人可以启发我吗?
这似乎有效(感谢Evan,把它放在这里所以线条在上下文中):
buffer = "path/filename.zip" # zip filename to write (or file-like object) name = "folder/data.txt" # name of file inside zip bytes = "blah blah blah" # contents of file inside zip zip = zipfile.ZipFile(buffer, "w", zipfile.ZIP_DEFLATED) info = zipfile.ZipInfo(name) info.external_attr = 0777 << 16L # give full access to included file zip.writestr(info, bytes) zip.close()
我仍然希望看到记录此内容的东西...我发现的另一个资源是Zip文件格式的注释:http://www.pkware.com/documents/casestudies/APPNOTE.TXT
此链接提供的信息比我在网上找到的任何其他内容都多.即使是拉链源也没有任何东西.复制相关部分以供后代使用.这个补丁实际上不是关于记录这种格式的,这只是为了说明当前文档是多么可悲(读取不存在).
# external_attr is 4 bytes in size. The high order two # bytes represent UNIX permission and file type bits, # while the low order two contain MS-DOS FAT file # attributes, most notably bit 4 marking directories. if node.isfile: zipinfo.compress_type = ZIP_DEFLATED zipinfo.external_attr = 0644 << 16L # permissions -r-wr--r-- data = node.get_content().read() properties = node.get_properties() if 'svn:special' in properties and \ data.startswith('link '): data = data[5:] zipinfo.external_attr |= 0120000 << 16L # symlink file type zipinfo.compress_type = ZIP_STORED if 'svn:executable' in properties: zipinfo.external_attr |= 0755 << 16L # -rwxr-xr-x zipfile.writestr(zipinfo, data) elif node.isdir and path: if not zipinfo.filename.endswith('/'): zipinfo.filename += '/' zipinfo.compress_type = ZIP_STORED zipinfo.external_attr = 040755 << 16L # permissions drwxr-xr-x zipinfo.external_attr |= 0x10 # MS-DOS directory flag zipfile.writestr(zipinfo, '')
此外,此链接具有以下内容.这里低位字节可能意味着四个字节中最右边(最低)的字节.所以这个是用于MS-DOS的,否则可以保留为零.
外部文件属性:(4个字节)
The mapping of the external attributes is host-system dependent (see 'version made by'). For MS-DOS, the low order byte is the MS-DOS directory attribute byte. If input came from standard input, this field is set to zero.
此外,从Debian的档案中下载的InfoZIP zip程序源代码中的源文件unix/unix.c 在评论中有以下内容.
/* lower-middle external-attribute byte (unused until now): * high bit => (have GMT mod/acc times) >>> NO LONGER USED! <<< * second-high bit => have Unix UID/GID info * NOTE: The high bit was NEVER used in any official Info-ZIP release, * but its future use should be avoided (if possible), since it * was used as "GMT mod/acc times local extra field" flags in Zip beta * versions 2.0j up to 2.0v, for about 1.5 years. */
所以把所有这些放在一起,看起来实际上只使用了第二高的字节,至少对于Unix来说.
编辑:我在Unix.SX上询问了Unix的这方面,问题是" zip格式的外部文件属性 ".看起来我有些不对劲.具体来说,前两个字节都用于Unix.
看看这个:在python中设置压缩文件的权限
我不完全确定这是不是你想要的,但它似乎是.
关键线似乎是:
zi.external_attr = 0777 << 16L
看起来它设置了0777
那里的权限.
早期的答案对我不起作用(在OS X 10.12上).我发现除了可执行标志(八进制755),我还需要设置"常规文件"标志(八进制100000).我在这里找到了这个:https://unix.stackexchange.com/questions/14705/the-zip-formats-external-file-attribute
一个完整的例子:
zipname = "test.zip" filename = "test-executable" zip = zipfile.ZipFile(zipname, 'w', zipfile.ZIP_DEFLATED) f = open(filename, 'r') bytes = f.read() f.close() info = zipfile.ZipInfo(filename) info.date_time = time.localtime() info.external_attr = 0100755 << 16L zip.writestr(info, bytes, zipfile.ZIP_DEFLATED) zip.close()
我的特定用例的完整示例,创建.app的zip,以便文件夹中的所有内容Contents/MacOS/
都是可执行的:https://gist.github.com/Draknek/3ce889860cea4f59838386a79cc11a85