From: Philip Oakley <philipoakley@iee.org>
Date: Fri, 14 Jun 2013 16:05:03 GMT
Subject: Re: [PATCH 2/3] sh-setup: add new peel_committish() helper
Message-ID: <59954A85BB7C4B279B61C46CC1D81CCA@PhilipOakley>
In-Reply-To: <1371215872-9796-3-git-send-email-artagnon@gmail.com>

From: "Ramkumar Ramachandra" <artagnon@gmail.com>
Sent: Friday, June 14, 2013 2:17 PM
> The normal way to check whether a certain revision resolves to a valid
> commit is:
>
>  $ git rev-parse --verify $REV^0
>
> Unfortunately, this does not work when $REV is of the type :/quuxery.

Is there a proper name for this style of revision specification? I've 
been letting this 'style' wash over me in the hope that I'd understand 
eventually, but it hasn't.

Loking at git-rev-parse I now see that it might be the 'Commit Message 
Regex' rev specifier.

If re-rolled, can this elucidation be included in the commit message?

> Write a helper to work around this limitation.
>
> Suggested-by: Junio C Hamano <gitster@pobox.com>
> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
> ---
> git-sh-setup.sh | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/git-sh-setup.sh b/git-sh-setup.sh
> index 2f78359..7a964ad 100644
> --- a/git-sh-setup.sh
> +++ b/git-sh-setup.sh
> @@ -313,3 +313,15 @@ then
>  }
>  : ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
> fi
> +
> +peel_committish () {
> + case "$1" in
> + :/*)
> + peeltmp=$(git rev-parse --verify "$1") &&
> + git rev-parse --verify "${peeltmp}^0"
> + ;;
> + *)
> + git rev-parse --verify "${1}^0"
> + ;;
> + esac
> +}
> -- 
> 1.8.3.1.381.g12ca056.dirty
>
> --
Philip