Allow invalid sync DBs to be returned by the library

They are placeholders, but important for things like trying to re-sync a
database missing a signature. By using the alpm_db_validity() method at
the right time, a client can take the appropriate action with these
invalid databases as necessary.

In pacman's case, we disallow just about anything that involves looking
at a sync database outside of an '-Sy' operation (although we do check
the validity immediately after). A few operations are still permitted-
'-Q' ops that don't touch sync databases as well as '-R'.

Signed-off-by: Dan McGee <dan@archlinux.org>

3 files changed, 9 insertions, 13 deletions

diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c
index d5d797cf..e3871001 100644
--- a/lib/libalpm/be_sync.c
+++ b/lib/libalpm/be_sync.c
@@ -596,14 +596,10 @@ alpm_db_t *_alpm_db_register_sync(alpm_handle_t *handle, const char *treename,
 	db->handle = handle;
 	db->siglevel = level;
 
-	if(sync_db_validate(db)) {
-		_alpm_db_free(db);
-		return NULL;
-	}
+	sync_db_validate(db);
 
 	handle->dbs_sync = alpm_list_add(handle->dbs_sync, db);
 	return db;
 }
 
-
 /* vim: set ts=2 sw=2 noet: */
diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index 783c7280..1d712797 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -315,6 +315,14 @@ int _alpm_sync_prepare(alpm_handle_t *handle, alpm_list_t **data)
 		*data = NULL;
 	}
 
+	/* ensure all sync database are valid since we will be using them */
+	for(i = handle->dbs_sync; i; i = i->next) {
+		const alpm_db_t *db = i->data;
+		if(!(db->status & DB_STATUS_VALID)) {
+			RET_ERR(handle, ALPM_ERR_DB_INVALID, -1);
+		}
+	}
+
 	if(!(trans->flags & ALPM_TRANS_FLAG_NODEPS)) {
 		alpm_list_t *resolved = NULL; /* target list after resolvedeps */
 
diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c
index 26989499..6cea9b7c 100644
--- a/lib/libalpm/trans.c
+++ b/lib/libalpm/trans.c
@@ -53,19 +53,11 @@ int SYMEXPORT alpm_trans_init(alpm_handle_t *handle, alpm_transflag_t flags,
 		alpm_trans_cb_progress progress)
 {
 	alpm_trans_t *trans;
-	alpm_list_t *i;
 
 	/* Sanity checks */
 	CHECK_HANDLE(handle, return -1);
 	ASSERT(handle->trans == NULL, RET_ERR(handle, ALPM_ERR_TRANS_NOT_NULL, -1));
 
-	for(i = handle->dbs_sync; i; i = i->next) {
-		const alpm_db_t *db = i->data;
-		if(!(db->status & DB_STATUS_VALID)) {
-			RET_ERR(handle, ALPM_ERR_DB_INVALID, -1);
-		}
-	}
-
 	/* lock db */
 	if(!(flags & ALPM_TRANS_FLAG_NOLOCK)) {
 		if(_alpm_handle_lock(handle)) {