libubi: improve libubi_open interface

Remove the not very nice @required parameter, and add a
possibility to distinguish between real errors and
a situation when UBI is not present.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/ubi-utils/src/ubiupdatevol.c b/ubi-utils/src/ubiupdatevol.c
index a1e5a30..b160461 100644
--- a/ubi-utils/src/ubiupdatevol.c
+++ b/ubi-utils/src/ubiupdatevol.c
@@ -316,9 +316,12 @@ int main(int argc, char * const argv[])
 	if (err)
 		return -1;
 
-	libubi = libubi_open(1);
-	if (libubi == NULL) {
-		sys_errmsg("cannot open libubi");
+	libubi = libubi_open();
+	if (!libubi) {
+		if (errno == 0)
+			errmsg("UBI is not present in the system");
+		else
+			sys_errmsg("cannot open libubi");
 		goto out_libubi;
 	}