libalpm: introduce a usage level for repos

This defines a level of interest a user has in a repository. These are
described by the bitmask flags in the alpm_db_usage_t enum:

  ALPM_DB_USAGE_SEARCH: repo is valid for searching
  ALPM_DB_USAGE_INSTALL: repo is valid for installs (e.g. -S pkg)
  ALPM_DB_USAGE_UPGRADE: repo is valid for sysupgrades
  ALPM_DB_USAGE_ALL: all of the above are valid

Explicitly listing the contents of a repo will always be valid, and the
repo will always be refreshed appropriately on sync operations.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index 3a04a87b..3245d64f 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -292,6 +292,23 @@ alpm_list_t SYMEXPORT *alpm_db_search(alpm_db_t *db, const alpm_list_t *needles)
 	return _alpm_db_search(db, needles);
 }
 
+/** Sets the usage bitmask for a repo */
+int SYMEXPORT alpm_db_set_usage(alpm_db_t *db, alpm_db_usage_t usage)
+{
+	ASSERT(db != NULL, return -1);
+	db->usage = usage;
+	return 0;
+}
+
+/** Gets the usage bitmask for a repo */
+int SYMEXPORT alpm_db_get_usage(alpm_db_t *db, alpm_db_usage_t *usage)
+{
+	ASSERT(db != NULL, return -1);
+	ASSERT(usage != NULL, return -1);
+	*usage = db->usage;
+	return 0;
+}
+
 
 /** @} */
 
@@ -365,6 +382,11 @@ alpm_list_t *_alpm_db_search(alpm_db_t *db, const alpm_list_t *needles)
 {
 	const alpm_list_t *i, *j, *k;
 	alpm_list_t *ret = NULL;
+
+	if(!(db->usage & ALPM_DB_USAGE_SEARCH)) {
+		return NULL;
+	}
+
 	/* copy the pkgcache- we will free the list var after each needle */
 	alpm_list_t *list = alpm_list_copy(_alpm_db_get_pkgcache(db));