From 79a31bb6bcae641f8d5f1d9ad18bd3ad56daf1d4 Mon Sep 17 00:00:00 2001
From: Juan RP <xtraeme@gmail.com>
Date: Wed, 21 Nov 2012 02:52:36 +0100
Subject: [PATCH] xbps-query: implemented -X, --revdeps in repository mode.

---
 NEWS                       |  4 ++++
 TODO                       |  2 --
 bin/xbps-query/defs.h      |  5 +++++
 bin/xbps-query/main.c      |  9 ++++++--
 bin/xbps-query/show-deps.c | 46 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index 0d6c841c..11065ac1 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,9 @@
 xbps-0.18 (???):
 
+ * xbps-query(8): implemented support to know reverse dependencies
+   in repository mode; that means you can now exactly what packages
+   require the target package from all registered repositories.
+
  * The virtual package configuration files are now read dynamically
    by libxbps at initialization time from default configuration directory:
    <rootdir>/etc/xbps/virtualpkg.d. Only files that end in ".conf" will
diff --git a/TODO b/TODO
index 656db01a..280cf050 100644
--- a/TODO
+++ b/TODO
@@ -9,8 +9,6 @@ xbps-create:
 
 All:
  - Add support to sign with PGP or RSA the repository index files.
- - Add requiredby support to pkg's dictionaries in repository's index,
-   to know reverse deps from remote repos.
 
 Issues listed at http://code.google.com/p/xbps/issues/list
 
diff --git a/bin/xbps-query/defs.h b/bin/xbps-query/defs.h
index 9a0b0b64..cd0cffea 100644
--- a/bin/xbps-query/defs.h
+++ b/bin/xbps-query/defs.h
@@ -28,10 +28,15 @@
 
 #include <xbps_api.h>
 
+#ifndef __UNCONST
+#define __UNCONST(a)    ((void *)(unsigned long)(const void *)(a))
+#endif
+
 /* from show-deps.c */
 int	show_pkg_deps(struct xbps_handle *, const char *);
 int	show_pkg_revdeps(struct xbps_handle *, const char *);
 int	repo_show_pkg_deps(struct xbps_handle *, const char *);
+int	repo_show_pkg_revdeps(struct xbps_handle *, const char *);
 
 /* from show-info-files.c */
 void	show_pkg_info(prop_dictionary_t);
diff --git a/bin/xbps-query/main.c b/bin/xbps-query/main.c
index 7053e173..3a6cfa91 100644
--- a/bin/xbps-query/main.c
+++ b/bin/xbps-query/main.c
@@ -251,8 +251,13 @@ main(int argc, char **argv)
 
 	} else if (show_rdeps) {
 		/* show-rdeps mode */
-		rv = show_pkg_revdeps(&xh, argv[optind]);
-
+		if (repo_mode)
+			rv = repo_show_pkg_revdeps(&xh, argv[optind]);
+		else {
+			rv = show_pkg_revdeps(&xh, argv[optind]);
+			if (rv == ENOENT)
+				rv = repo_show_pkg_revdeps(&xh, argv[optind]);
+		}
 	}
 
 	xbps_end(&xh);
diff --git a/bin/xbps-query/show-deps.c b/bin/xbps-query/show-deps.c
index 2786a1b4..f6f755f6 100644
--- a/bin/xbps-query/show-deps.c
+++ b/bin/xbps-query/show-deps.c
@@ -90,3 +90,49 @@ repo_show_pkg_deps(struct xbps_handle *xhp, const char *pattern)
 
 	return 0;
 }
+
+static int
+repo_revdeps_cb(struct xbps_handle *xhp,
+		struct xbps_rpool_index *rpi,
+		void *arg,
+		bool *done)
+{
+	prop_dictionary_t pkgd;
+	prop_array_t pkgdeps;
+	const char *pkgver, *arch, *pattern = arg;
+	size_t i;
+
+	(void)done;
+
+	for (i = 0; i < prop_array_count(rpi->repo); i++) {
+		pkgd = prop_array_get(rpi->repo, i);
+		pkgdeps = prop_dictionary_get(pkgd, "run_depends");
+		if (pkgdeps == NULL || prop_array_count(pkgdeps) == 0)
+			continue;
+
+		if (xbps_match_pkgdep_in_array(pkgdeps, pattern)) {
+			prop_dictionary_get_cstring_nocopy(pkgd,
+			    "architecture", &arch);
+			if (xbps_pkg_arch_match(xhp, arch, NULL)) {
+				prop_dictionary_get_cstring_nocopy(pkgd,
+				    "pkgver", &pkgver);
+				printf("%s\n", pkgver);
+			}
+		}
+	}
+
+	return 0;
+}
+
+int
+repo_show_pkg_revdeps(struct xbps_handle *xhp, const char *pkg)
+{
+	char *pattern;
+
+	if (xbps_pkg_version(pkg))
+		pattern = strdup(pkg);
+	else
+		pattern = xbps_xasprintf("%s-9999999", pkg);
+
+	return xbps_rpool_foreach(xhp, repo_revdeps_cb, pattern);
+}