On 03/28/2013 02:48 PM, Junio C Hamano wrote:
> I think it has always been about "is this well formed and we can turn it
> into a raw 20-byte object name?" and never about"does it exist?"

That's surprising.  The man page says

        The parameter given must be usable as a single, valid object name.
        Otherwise barf and abort.

"Valid", to me, implies that the parameter should be the name of an
actual object, and this also seems a more useful concept to me and more
consistent with the command's behavior when passed other arguments.

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,

    git cat-file -e $ARG && git rev-parse --verify $ARG

I suppose in most contexts where one wants to know whether an object
name is valid, one should also verify that the object has the type that
you expect:

    test X$(git cat-file -t $ARG) = Xcommit &&
        git rev-parse --verify $ARG

or (allowing tag dereferencing)

    git cat-file -e $ARG^{commit} &&
        git rev-parse --verify $ARG^{commit}


Michael Haggerty
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