Jeff King <> writes:

> On Thu, Mar 28, 2013 at 04:34:19PM +0100, Michael Haggerty wrote:
>> Is there a simple way to verify an object name more strictly and convert
>> it to an SHA1?  I can only think of solutions that require two commands,
>> like
>>     git cat-file -e $ARG && git rev-parse --verify $ARG
> Is the rev-parse line doing anything there? If $ARG does not resolve to
> a sha1, then wouldn't cat-file have failed?
> -Peff

You could force rev-parse to resolve the input to an existing
object, with something like this:

        git rev-parse --verify "$ARG^{}"

It will unwrap a tag, so the output may end up pointing at a object
that is different from $ARG in such a case.

But what is the purpose of turning a random string to a random
40-hex in the first place?
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