Subject: Re: [PATCH v2] completion: fix issue with process substitution not working on Git for Windows

From: SZEDER Gábor <[email-masked]>
Date: Thu, 27 Oct 2011 11:05:30 +0200

On Wed, Oct 26, 2011 at 09:13:09PM +0200, Stefan Naewe wrote:
> Git for Windows comes with a bash that doesn't support process substitution.
> It issues the following error when using git-completion.bash with
> GIT_PS1_SHOWUPSTREAM set:
> 
> $ export GIT_PS1_SHOWUPSTREAM=1
> sh.exe": cannot make pipe for process substitution: Function not implemented
> sh.exe": cannot make pipe for process substitution: Function not implemented
> sh.exe": <(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n '): ambiguous redirect
> 
> Replace the process substitution with a 'here string'.
> 
> Signed-off-by: Stefan Naewe <[email-masked]>
> ---
>  contrib/completion/git-completion.bash |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
> index 8648a36..0b3d47e 100755
> --- a/contrib/completion/git-completion.bash
> +++ b/contrib/completion/git-completion.bash
> @@ -110,6 +110,7 @@ __git_ps1_show_upstream ()
>  	local upstream=git legacy="" verbose=""
>  
>  	# get some config options from git-config
> +	output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
>  	while read key value; do
>  		case "$key" in
>  		bash.showupstream)
> @@ -125,7 +126,7 @@ __git_ps1_show_upstream ()
>  			upstream=svn+git # default upstream is SVN if available, else git
>  			;;
>  		esac
> -	done < <(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')
> +	done <<< "$output"

The $output variable is not declared as local and therefore it leaks
into the environment.  But instead of declaring it local, why not
eliminate it altogether, and use the "$(git config ....)" command
substitution as here string?

Gábor