qemu-config: add error propagation to qemu_config_parse

This enables some simplification of vl.c via error_fatal, and improves
error messages.  Before:

  $ ./qemu-system-x86_64 -readconfig .
  qemu-system-x86_64: error reading file
  qemu-system-x86_64: -readconfig .: read config .: Invalid argument
  $ /usr/libexec/qemu-kvm -readconfig foo
  qemu-kvm: -readconfig foo: read config foo: No such file or directory

After:

  $ ./qemu-system-x86_64 -readconfig .
  qemu-system-x86_64: -readconfig .: Cannot read config file: Is a directory
  $ ./qemu-system-x86_64 -readconfig foo
  qemu-system-x86_64: -readconfig foo: Could not open 'foo': No such file or directory

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210226170816.231173-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/block/blkdebug.c b/block/blkdebug.c
index 5fe6172da9..7eaa8a28bf 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -279,9 +279,8 @@ static int read_config(BDRVBlkdebugState *s, const char *filename,
             return -errno;
         }
 
-        ret = qemu_config_parse(f, config_groups, filename);
+        ret = qemu_config_parse(f, config_groups, filename, errp);
         if (ret < 0) {
-            error_setg(errp, "Could not parse blkdebug config file");
             goto fail;
         }
     }