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sha-1 mismatch using command line sha1sum

Subject: sha-1 mismatch using command line sha1sum

## tl;dr

4 messages between Jan 16, 2007 and Jan 16, 2007.

replies: 3people: 3as markdown or json

Andy Parkins· Jan 16, 2007, 13:42 UTC · lore
Hello,
I came across this message:
http://www.gelato.unsw.edu.au/archives/git/0504/0212.html

So I thought, "hey that's interesting, I'll try it". I was surprised to find this:

$ sha1sum .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8 ac4c6f1d36d6e0341486789b32f86ae6f506df35 .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8

This is in the latest git repository.

Is this correct, or should we all begin screaming and crying that our repositories are woefully corrupt? :-)

Andy
-- 
Dr Andy Parkins, M Eng (hons), MIEE
andyparkins@gmail.com
Baz· Jan 16, 2007, 13:50 UTC · re: Andy Parkins · lore

Re: sha-1 mismatch using command line sha1sum

On 16/01/07, Andy Parkins <andyparkins@gmail.com> wrote:
Show 16 quoted lines
> Hello,
>
> I came across this message:
>
> http://www.gelato.unsw.edu.au/archives/git/0504/0212.html
>
> So I thought, "hey that's interesting, I'll try it".  I was surprised to find
> this:
>
> $ sha1sum .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8
> ac4c6f1d36d6e0341486789b32f86ae6f506df35  .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8
>
> This is in the latest git repository.
>
> Is this correct, or should we all begin screaming and crying that our
> repositories are woefully corrupt? :-)
That changed some time ago. From the git(7) manpage:

"It's worth noting that the SHA1 hash that is used to name the object is the hash of the original data plus this header, so sha1sum file does not match the object name for file. (Historical note: in the dawn of the age of git the hash was the sha1 of the compressed object.)"

Cheers, Baz

Andy Parkins· Jan 16, 2007, 14:18 UTC · re: Baz · lore

Re: sha-1 mismatch using command line sha1sum

On Tuesday 2007 January 16 13:50, Baz wrote:
> That changed some time ago. From the git(7) manpage:

Oh good. I have to admit, I started sweating a bit at the thought that the hashes might be wrong :-) I should know better; git is infalliable :-)

Andy
-- 
Dr Andy Parkins, M Eng (hons), MIEE
andyparkins@gmail.com
Jakub Narebski· Jan 16, 2007, 14:17 UTC · re: Andy Parkins · lore

Re: sha-1 mismatch using command line sha1sum

Andy Parkins wrote:
Show 16 quoted lines
> Hello,
> 
> I came across this message:
> 
> http://www.gelato.unsw.edu.au/archives/git/0504/0212.html
> 
> So I thought, "hey that's interesting, I'll try it".  I was surprised to find 
> this:
> 
> $ sha1sum .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8 
> ac4c6f1d36d6e0341486789b32f86ae6f506df35  .git/objects/f4/b6c6b90fdce12d69e4ad80ff6082405ec8cfb8
> 
> This is in the latest git repository.
> 
> Is this correct, or should we all begin screaming and crying that our 
> repositories are woefully corrupt? :-)
sha-1 sum of _uncompressed_ object.
-- 
Jakub Narebski
Warsaw, Poland
ShadeHawk on #git

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