Subject: Re: [PATCH v2] mergetool: use more conservative temporary filenames

From: Junio C Hamano <[email-masked]>
Date: Mon, 13 Oct 2014 12:30:57 -0700

David Aguilar <[email-masked]> writes:

> Avoid filenames with multiple dots so that overly-picky tools do
> not misinterpret their extension.
>
> Previously, foo/bar.ext in the worktree would result in e.g.
>
> 	./foo/bar.ext.BASE.1234.ext
>
> This can be improved by having only a single .ext and using
> underscore instead of dot so that the extension cannot be
> misinterpreted.  The resulting path becomes:
>
> 	./foo/bar_BASE_1234.ext
>
> Suggested-by: Sergio Ferrero <[email-masked]>
> Helped-by: Junio C Hamano <[email-masked]>
> Signed-off-by: David Aguilar <[email-masked]>
> ---
> Changes since v1
>
> The commit message changed to say "./foo" instead of "foo".
>
> The patch now uses Junio's suggestion to minimize variables,
> and preserves the original leading ./ just in case there are
> tools that rely on having ./ in front of relative paths.

;-)

Perhaps together with the "allow temporary directory" patch, we
would want to have a few tests for these changes?

>
>  git-mergetool.sh | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/git-mergetool.sh b/git-mergetool.sh
> index 9a046b7..96a61ba 100755
> --- a/git-mergetool.sh
> +++ b/git-mergetool.sh
> @@ -228,11 +228,17 @@ merge_file () {
>  		return 1
>  	fi
>  
> -	ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
> -	BACKUP="./$MERGED.BACKUP.$ext"
> -	LOCAL="./$MERGED.LOCAL.$ext"
> -	REMOTE="./$MERGED.REMOTE.$ext"
> -	BASE="./$MERGED.BASE.$ext"
> +	if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
> +	then
> +		ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
> +	else
> +		BASE=$MERGED
> +		ext=
> +	fi
> +	BACKUP="./${BASE}_BACKUP_$$$ext"
> +	LOCAL="./${BASE}_LOCAL_$$$ext"
> +	REMOTE="./${BASE}_REMOTE_$$$ext"
> +	BASE="./${BASE}_BASE_$$$ext"
>  
>  	base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
>  	local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')