From 734a2c3c2b46c52482dc487265033f83e314fd93 Mon Sep 17 00:00:00 2001
From: Juan RP <xtraeme@gmail.com>
Date: Tue, 11 Jun 2013 16:18:40 +0200
Subject: [PATCH] xbps-query(8): added support to find revdeps for virtual pkgs
 in repository mode.

---
 NEWS                       |  7 +++++++
 bin/xbps-query/show-deps.c | 42 +++++++++++++++++++++++++++++++++-----
 2 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index 48afd96a..e0a32182 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,12 @@
 xbps-0.25 (???):
 
+ * xbps-query(8): added support to find reverse dependencies in repository mode
+   for virtual packages, i.e:
+
+	$ xbps-query -RX xserver-abi-input
+	xf86-input-evdev-2.8.0_1
+	...
+
  * Use a single zlib compressed file to store repository data `<arch>-repodata`.
    This will allow us to extend repositories with more metadata if needed, and
    simplifies the API. This is just the starting point to add PGP signatures.
diff --git a/bin/xbps-query/show-deps.c b/bin/xbps-query/show-deps.c
index f0fdb887..0cd41d5f 100644
--- a/bin/xbps-query/show-deps.c
+++ b/bin/xbps-query/show-deps.c
@@ -164,8 +164,11 @@ repo_revdeps_cb(struct xbps_repo *repo, void *arg, bool *done)
 int
 repo_show_pkg_revdeps(struct xbps_handle *xhp, const char *pkg)
 {
-	prop_dictionary_t pkgd;
-	const char *pkgver;
+	prop_array_t vdeps;
+	prop_dictionary_t pkgd = NULL;
+	const char *pkgver, *vpkg;
+	unsigned int i;
+	int rv = 0;
 
 	if (xbps_pkg_version(pkg))
 		pkgver = pkg;
@@ -173,9 +176,38 @@ repo_show_pkg_revdeps(struct xbps_handle *xhp, const char *pkg)
 		if (((pkgd = xbps_rpool_get_pkg(xhp, pkg)) == NULL) &&
 		    ((pkgd = xbps_rpool_get_virtualpkg(xhp, pkg)) == NULL))
 			return ENOENT;
-
-		prop_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
 	}
+	/*
+	 * If pkg is a virtual pkg let's match it instead of the real pkgver.
+	 */
+	if (pkgd) {
+		if ((vdeps = prop_dictionary_get(pkgd, "provides"))) {
+			for (i = 0; i < prop_array_count(vdeps); i++) {
+				char *buf, *vpkgn;
 
-	return xbps_rpool_foreach(xhp, repo_revdeps_cb, __UNCONST(pkgver));
+				prop_array_get_cstring_nocopy(vdeps, i, &vpkg);
+				if (strchr(vpkg, '_') == NULL)
+					buf = xbps_xasprintf("%s_1", vpkg);
+				else
+					buf = strdup(vpkg);
+
+				vpkgn = xbps_pkg_name(buf);
+				assert(vpkgn);
+				free(buf);
+				if (strcmp(vpkgn, pkg)) {
+					free(vpkgn);
+					continue;
+				}
+				free(vpkgn);
+				rv = xbps_rpool_foreach(xhp, repo_revdeps_cb,
+				    __UNCONST(vpkg));
+			}
+		} else {
+			prop_dictionary_get_cstring_nocopy(pkgd,
+			    "pkgver", &pkgver);
+			rv = xbps_rpool_foreach(xhp, repo_revdeps_cb,
+			    __UNCONST(pkgver));
+		}
+	}
+	return rv;
 }