On Thu, Feb 07, 2013 at 03:01:20PM +0100, Michal Nazarewicz wrote:

>  > There are a few disallowed characters, like "\n" in key or value, and
>  > "=" in a key. They should never happen unless the caller is buggy, but
>  > should we check and catch them here?
>  I left it as is for now since it's not entairly clear to me what to
>  do in all cases.  In particular:
>  - when reading, what to do if the line is " foo = bar ",

According to the spec, whitespace (except for the final newline) is not
significant, and that parses key=" foo ", value=" bar ". The spec could
ignore whitespace on the key side, but I intentionally did not in an
attempt to keep the protocol simple. Your original implementation did
the right thing already.

>  - when reading, what to do if the line is "foo=" (ie. empty value),

The empty string is a valid value.

>  - when writing, what to do if value is a single space,

Then it's a single space. It's the caller's problem whether that is an
issue or not.

>  - when writing, what to do if value ends with a new line,

That's bogus. We cannot represent that value. I'd suggest to simply die,
as it is a bug in the caller (we _could_ try to be nice and assume the
caller accidentally forgot to chomp, but I'd rather be careful than

>  - when writing, what to do if value is empty (currently not printed at all),

I think you should still print it. It's unlikely to matter, but
technically a helper response may override keys (or set them to blank),
and the intermediate state gets sent on to the next helper, if there are

>  On Thu, Feb 07 2013, Matthieu Moy <matthieu....@grenoble-inp.fr> wrote:
>  > I think you should credit git-remote-mediawiki for the code in the
>  > commit message. Perhaps have a first "copy/paste" commit, and then an
>  > "adaptation" commit to add sort, ^ anchor in regexp, doc and your
>  > callback mechanism, but I won't insist on that.
>  Good point.  Creating additional commit is a bit too much for my
>  licking, but added note in commit message.

I think that's fine.

> +sub _credential_read {
> +     my %credential;
> +     my ($reader, $op) = (@_);
> +     while (<$reader>) {
> +             if (!/^([^=\s]+)=(.*?)\s*$/) {
> +                     throw Error::Simple("unable to parse git credential $op 
> response:\n$_");
> +             }
> +             $credential{$1} = $2;

I think this is worse than your previous version. The spec really is as
simple as:

  while (<$reader>) {
          last if /^$/; # blank line is OK as end-of-credential
                  or throw Error::Simple(...);
          $credential{$1} = {$2};

(actually, the spec as written does not explicitly forbid an empty key,
but it is nonsensical, and it might be worth updating the docs).

> +sub _credential_write {
> +     my ($credential, $writer) = @_;
> +
> +     for my $key (sort {
> +             # url overwrites other fields, so it must come first
> +             return -1 if $a eq 'url';
> +             return  1 if $b eq 'url';
> +             return $a cmp $b;
> +     } keys %$credential) {
> +             if (defined $credential->{$key} && length $credential->{$key}) {
> +                     print $writer $key, '=', $credential->{$key}, "\n";
> +             }

When I mentioned error-checking the format, I really just meant
something like:

        $key =~ /[=\n\0]/
                and die "BUG: credential key contains invalid characters: $key";
        if (defined $credential->{$key}) {
                $credential->{$key} =~ /[\n\0]/
                        and die "BUG: credential value contains invalid 
characters: $credential->{key}";
                print $writer $key, '=', $credential->{$key}, "\n";

Those dies should never happen, and are indicative of a bug in the
caller. We can't even represent them in the protocol, so we might as
well alert the user and die rather than trying to guess what the caller

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