On Mon, Jun 16, 2008 at 13:51, Alf Clement <alf.clement@gmail.com> wrote:
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> Hi all,
>
> I want to compile the current repository hash id into my program, to
> be able to checkout later this
> id an see the exact files for the compile. It should flag if there are
> currently modified files in the
> directory tree.

You can look at how git does it:

http://git.kernel.org/?p=git/git.git;a=blob;f=GIT-VERSION-GEN;hb=HEAD

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>
> What would be the best command to get a unique identifier?

"git rev-parse HEAD" for a unique identifier,
but "git describe" is more convenient/useful.

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> Do I need the 40 digit hash id?

Normally 7 or 8 are sufficient.

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> How can I make sure that a shorter hash id will be unique?

You can't. Even the 40 digit hash is "only" cryptographically unique.
But within a project 7 or 8 digits are unique enough for practical
use.

Santi
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