[PATCH opkg] pkg_hash: don't suggest incompatible packages

[Paul Spooren]

Up until now opkg would suggest packages with unsatisfied dependencies
as installable candidates. This is a frequent issue for the kmod feed in
snapshot images. In these cases opkg suggest a newer kmod version than
compatible with the installed kernel, because the same package is
available both in the kmods archive and the target specific packages
feed.

This commit fixes the issue by dropping all package problematic
candidates by checking if all their dependencies could be installed.

Signed-off-by: Paul Spooren <mail at aparcar.org>
---
 libopkg/pkg_hash.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/libopkg/pkg_hash.c b/libopkg/pkg_hash.c
index 52c64ff..0d9b55b 100644
--- a/libopkg/pkg_hash.c
+++ b/libopkg/pkg_hash.c
@@ -20,6 +20,7 @@
 #include "hash_table.h"
 #include "pkg.h"
 #include "opkg_message.h"
+#include "pkg_depends.h"
 #include "pkg_vec.h"
 #include "pkg_hash.h"
 #include "parse_util.h"
@@ -373,14 +374,27 @@ pkg_t *pkg_hash_fetch_best_installation_candidate(abstract_pkg_t * apkg,
 					 arch_priority, pkg_get_string(maybe, PKG_VERSION));
 				/* We make sure not to add the same package twice. Need to search for the reason why
 				   they show up twice sometimes. */
-				if ((arch_priority > 0)
-				    &&
-				    (!pkg_vec_contains(matching_pkgs, maybe))) {
+				char **unresolved = NULL;
+				pkg_vec_t *depends = pkg_vec_alloc();
+				pkg_hash_fetch_unsatisfied_dependencies(maybe, depends,
+					&unresolved);
+
+				if (!unresolved &&
+						(arch_priority > 0) &&
+						(!pkg_vec_contains(matching_pkgs, maybe))) {
 					max_count++;
 					abstract_pkg_vec_insert(matching_apkgs,
 								maybe->parent);
 					pkg_vec_insert(matching_pkgs, maybe);
 				}
+
+				if (unresolved) {
+					char **tmp = unresolved;
+					while (tmp)
+						free(*(tmp++));
+					free(unresolved);
+				}
+				pkg_vec_free(depends);
 			}
 
 			if (vec->len > 0 && matching_pkgs->len < 1)
-- 
2.27.0