Re: RPM C API (and other fun acronyms)

[Jeff Johnson <n3npq jbj gmail com>]

On Sep 19, 2006, at 4:16 PM, Michael Jennings wrote:

> On Tuesday, 19 September 2006, at 15:13:56 (-0500),
> R. Tyler Ballance wrote:
>
> > NEVRA, now I get it :) That is what I was looking for. However, your
> > snippets combined with Jeff's snippets don't work:
>
> I think you forgot:
>
>     ret = rpmReadConfigFiles(NULL, NULL);
>     if (ret != RPMRC_OK) {
>         print_error("Unable to read RPM configuration.\n");
>     }

Yep.

Alternatively, all that needs setting is %_dbpath, addMacro() can/ 
will do that (IIRC).

Hints:

1) You can skip headerFreeData() for RPM_STRING_TYPE (and all the  
integer types).

2) headerDump is annoying and painful, try headerSprintf() instead.  
If you *really*
want a full dump, then using this query format
    const char * qfmt = "[%{*:xml}\n]";
is perhaps more readable than headerDump() spew.

And YAML (for rpm later than 4.4.2) is even more pleasant on the eyes
    const char * qfmt = "[%{*:yaml}\n]";

FWIW, if all you're doing is diffs of metadata content, python or perl
is even easier to code up than C.

hth

73 de Jeff