"Philip Oakley" <philipoakley@xxxxxxx> writes:
> If I have a renamed file which is a git object, such a "Git_Object", was
> 8c-something-or-other, what is the easiest way of examining / decoding /
> recreating the original file (either as its sha1, or a cat-file).
>
> I don't appear to be able to unzip the file in its raw format... I'm using
> Msysgit on windows XP.
The SHA1 is over the decompressed object contents. The file simply
holds a zlib-compressed stream of those contents. (It's pretty much
like gzip without the file header.)
You can use any bindings to zlib and something that does sha1, e.g. in
python:
$ cd g/.git/objects/aa/ # my git.git
$ ls
592bda986a8380b64acd8cbb3d5bdfcbc0834d 6322a757bee31919f54edcc127608a3d724c99
$ python
Python 2.7.2 (default, Aug 19 2011, 20:41:43) [GCC] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib
>>> hashlib.sha1(open('592bda986a8380b64acd8cbb3d5bdfcbc0834d').read().decode('zlib')).digest().encode('hex')
'aa592bda986a8380b64acd8cbb3d5bdfcbc0834d'
Notice that the first byte of the hash goes into the directory name.
--
Thomas Rast
trast@{inf,student}.ethz.ch
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