[Qemu-devel] [PULL 06/15] vl: Improve error message when we can't load fw_cfg from file

[Paolo Bonzini <pbonzini@redhat.com>]

From: Li Qiang <liq3ea@gmail.com>

parse_fw_cfg() reports "can't load" without further details.  Get
the details from g_file_get_contents(), and include them in the
error message.

Signed-off-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <1541051971-28584-1-git-send-email-liq3ea@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 vl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/vl.c b/vl.c
index fa25d1a..32ab6e6 100644
--- a/vl.c
+++ b/vl.c
@@ -2244,8 +2244,10 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
         size = strlen(str); /* NUL terminator NOT included in fw_cfg blob */
         buf = g_memdup(str, size);
     } else {
-        if (!g_file_get_contents(file, &buf, &size, NULL)) {
-            error_setg(errp, "can't load %s", file);
+        GError *err = NULL;
+        if (!g_file_get_contents(file, &buf, &size, &err)) {
+            error_setg(errp, "can't load %s: %s", file, err->message);
+            g_error_free(err);
             return -1;
         }
     }
-- 
1.8.3.1