In update mode, when opening the database fails, probably because it is

missing or corrupt, just rebuild it from scratch.  This also helps when
installing the very first port on a freshly installed machine
and is similar to what espie@'s classical makewhatis(8) did.

Issue reported by naddy@ via kili@.

1 files changed, 17 insertions, 7 deletions

diff --git a/mandocdb.c b/mandocdb.c
index ebcfd181..206c7781 100644
--- a/mandocdb.c
+++ b/mandocdb.c
@@ -442,15 +442,25 @@ main(int argc, char *argv[])
 		 */
 		if (0 == set_basedir(path_arg))
 			goto out;
-		for (i = 0; i < argc; i++)
-			filescan(argv[i]);
-		if (0 == dbopen(1))
-			goto out;
-		if (OP_TEST != op)
-			dbprune();
+		if (dbopen(1)) {
+			for (i = 0; i < argc; i++)
+				filescan(argv[i]);
+			if (OP_TEST != op)
+				dbprune();
+		} else {
+			/*
+			 * Database missing or corrupt.
+			 * Recreate from scratch.
+			 */
+			op = OP_DEFAULT;
+			if (0 == treescan())
+				goto out;
+			if (0 == dbopen(0))
+				goto out;
+		}
 		if (OP_DELETE != op)
 			mpages_merge(mc, mp);
-		dbclose(1);
+		dbclose(OP_DEFAULT == op ? 0 : 1);
 	} else {
 		/*
 		 * If we have arguments, use them as our manpaths.