[augeas-devel] escaping special characters in the path sent to aug_get()

[Raphaël Pinson]

Hi Laine,

I believe [0] might be of interest to you.


Cheers,


Raphael

[0]
https://github.com/hercules-team/augeas/commit/3fb6543af886bf3de8e21b0b8b8fc30877826e89


On Fri, Dec 5, 2014 at 7:02 PM, Laine Stump <laine at redhat.com> wrote:

> I want to sanitize the path sent to aug_get(aug, path, &result) (and
> probably other functions, and it's not clear to me what characters are
> considered "special", nor how to escape them in the string. An example
> of this, let's say I want to know the mac address of a user-supplied
> network interface, so I do this:
>
>   sprintf(&path, "/files/sys/class/net/%s/address/content", intf)
>
>   r = aug_match(aug, path, &mac);
>
> If the interface name contains special characters interpreted by
> aug_match's "xpath-like" parser, then I won't necessarily get back the
> results I expected.
>
> So what I would like to do is precede this with a call to
> "aug_escape(intf, &sanitized_intf)" which would escape any characters
> having a special meaning to augeas. An API in augeas would be very nice,
> but since that doesn't exist, can someone point me at some documentation
> that is easier to understand than the comments in augeas.c? :-o
>
>
> ========== Side Topic
>
> One person suggested creating an augeas variable whose value was the
> contents of intf, then referencing that variable in the path sent to
> aug_match(); unfortunately, having a path string like this:
>
>     /files/sys/class/net/$interface/address/content
>
> seems to never work. For that matter, defining a variable that contains
> the entire path, then calling aug_get(aug, "$interface", &mac) doesn't
> even do what I want - variable substitution does work when the *entire
> path string* is "$variableName", but the xpath-like evaluation still
> takes place, so the special characters are still interpreted and acted on.
>
>
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