Re: [PATCH 3/4] hook: add signature using "interpret-trailers"

> The sample hook to prepare the commit message before
> a commit allows users to opt-in to add the signature
> to the commit message. The signature is added at a place
> that isn't consistent with the "-s" option of "git commit".
> Further, it could go out of view in certain cases.
> 
> Add the signature in a way similar to "-s" option of
> "git commit" using git's interpret-trailers command.
> 
> It works well in all cases except when the user invokes
> "git commit" without any arguments. In that case manually
> add a new line after the first line to ensure it's consistent
> with the output of "-s" option.
> 

> Signed-off-by: Kaartic Sivaraam <kaarticsivaraam91196@gmail.com>
> ---
>  templates/hooks--prepare-commit-msg.sample | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/templates/hooks--prepare-commit-msg.sample b/templates/hooks--prepare-commit-msg.sample
> index 708f0e92c..a15d6d634 100755
> --- a/templates/hooks--prepare-commit-msg.sample
> +++ b/templates/hooks--prepare-commit-msg.sample
> @@ -32,4 +32,8 @@ SHA1=$3
>  # esac
>  
>  # SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
> -# grep -qs "^$SOB" "$COMMIT_MSG_FILE" || echo "$SOB" >> "$COMMIT_MSG_FILE"
> +# git interpret-trailers --in-place --trailer "$SOB" "$COMMIT_MSG_FILE"
> +# if test -z "$COMMIT_SOURCE"
> +# then
> +#   @PERL_PATH@ -i.bak -pe 'print "\n" if($first_line++ == 0)' "$COMMIT_MSG_FILE"
> +# fi
>