Re: "git log -- SHA-1" - how to get/simulate this functionality?

From: Alex Riesen <raa.lkml@gmail.com>
Date: Apr 26, 2010, 18:57 UTC
Message-ID: <p2v81b0412b1004261157pf26db339t7d27b1b317a99b5e@mail.gmail.com>
In-Reply-To: <p2y76c5b8581004261122g8e2950fci507cc9090a865843@mail.gmail.com>

On Mon, Apr 26, 2010 at 20:22, Eugene Sajine <euguess@gmail.com> wrote:

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> On Mon, Apr 26, 2010 at 2:08 PM, Alex Riesen <raa.lkml@gmail.com> wrote:
>> On Mon, Apr 26, 2010 at 19:56, Eugene Sajine <euguess@gmail.com> wrote:
>>> On Mon, Apr 26, 2010 at 1:54 PM, Eugene Sajine <euguess@gmail.com> wrote:
>>>> Hi,
>>>>
>>>> I'm wondering if there is a way to get some repo information if the
>>>> only thing i know is SHA-1 (no full path to the file)
>>>
>>> I mean of course the SHA-1 of the blob, i.e. the result of git
>>> hash-object some_file
>>
>> Try 'git cat-file -t <sha>'. It prints what object type is under the hash.
>> Than you can use either 'git cat-file <type> <sha>' (the most precise version,
>> which shall fail if anything is wrong), 'git cat-file -p <sha>' or plain
>> 'git show <sha>' (which always works, unless repo's broken).
>>
>
> Well thank you for that, but that gives me what i already know - the content.
> I need to "reverse engineer" the history by having only the content
> and its SHA-1 in order to indentify the last commitID and get all
> relevant info (author, date etc. )

Hmm. In that case, your using of git log look like a good way to get the information. If you wanted an output format which is better suited for automated parsing, you can look at "git rev-list --pretty=format:...", let it output only commit and tree hashes, and grep the output of "git ls-tree" for your hash...

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> This is all about avoiding using keyword expansion (thanks CVS for bad habbits)
>
> Thanks,
> Eugene
>