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2013-12-29-XBPS-API-example.md

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layout post
title XBPS API example: list pkgs by maintainer in repos
comments true

In this post I'll show a real and simple example of the XBPS API. The example allows you to find out which packages are being maintained by a contributor (aka maintainer).

{% highlight C %} #define _GNU_SOURCE /* for strcasestr() */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <xbps.h>

static int repo_foreach(struct xbps_repo *repo, void *arg, bool *done) { xbps_dictionary_t pkgd; xbps_object_t obj; xbps_object_iterator_t iter; const char *maint, *pkgver, *str = arg; bool printed_uri = false;

/* ignore empty repos */
if (repo->idx == NULL)
	return 0;

iter = xbps_dictionary_iterator(repo->idx);
while ((obj = xbps_object_iterator_next(iter)) != NULL) {
	pkgd = xbps_dictionary_get_keysym(repo->idx, obj);
	xbps_dictionary_get_cstring_nocopy(pkgd, "maintainer", &maint);
	if (strcasestr(maint, str)) {
		xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
		if (!printed_uri) {
			printf("%s:\n", repo->uri);
			printed_uri = true;
		}
		printf("  %s (%s)\n", pkgver, maint);
	}
}
xbps_object_iterator_release(iter);
if (printed_uri)
	printf("\n");

return 0;

}

int main(int argc, char **argv) { struct xbps_handle xh; int rv;

if (argc != 2) {
	fprintf(stdout, "usage: %s maintainer\n", argv[0]);
	exit(EXIT_FAILURE);
}

memset(&xh, 0, sizeof(xh));

if ((rv = xbps_init(&xh)) != 0) {
	fprintf(stderr, "failed to initialize libxbps: %s\n", strerror(rv));
	exit(EXIT_FAILURE);
}
rv = xbps_rpool_foreach(&xh, repo_foreach, argv[1]);
exit(rv);

} {% endhighlight %}

To compile the example you'll have to install some additional packages:

# xbps-install -Sy gcc libxbps-devel pkg-config

And then to compile the C source code:

$ cc `pkg-config --cflags --libs libxbps` find_pkgs_by_maintainer.c

You can then specify a string to be matched in all packages registered in all available repositories, i.e:

$ ./a.out morris
http://xbps.nopcode.org/repos/current:
  abcde-2.5.4_2 (Philip Morris <cancer@marlboro.us>)
  abook-0.5.6_1 (Philip Morris <cancer@marlboro.us>)
  cd-discid-1.4_2 (Philip Morris <cancer@marlboro.us>)
  emacs-24.3_2 (Philip Morris <cancer@marlboro.us>)
  task-2.2.0_1 (Philip Morris <cancer@marlboro.us>)
  vorbis-tools-1.4.0_1 (Philip Morris <cancer@marlboro.us>)

Please check out /usr/include/xbps.h to know more about the XBPS API.