[Qemu-block] [PATCH v2 6/8] blockdev: Improve message for orphaned -drive

[Markus Armbruster]

We warn when a -drive isn't supported by the machine type (commit
a66c9dc):

    $ qemu-system-x86_64 -S -display none -drive if=mtd
    Warning: Orphaned drive without device: id=mtd0,file=,if=mtd,bus=0,unit=0

Improve this to point to the offending bit of configuration:

    qemu-system-x86_64: -drive if=mtd: warning: machine type does not support 
this drive

Especially nice when it's hidden behind -readconfig foo.cfg:

    qemu-system-x86_64:foo.cfg:140: warning: machine type does not support this 
drive

Signed-off-by: Markus Armbruster <address@hidden>
---
 blockdev.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 245e1e1..a597a66 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -231,6 +231,7 @@ bool drive_check_orphaned(void)
 {
     BlockBackend *blk;
     DriveInfo *dinfo;
+    Location loc;
     bool rs = false;
 
     for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
@@ -239,10 +240,10 @@ bool drive_check_orphaned(void)
         /* Unless this is a default drive, this may be an oversight. */
         if (!blk_get_attached_dev(blk) && !dinfo->is_default &&
             dinfo->type != IF_NONE) {
-            fprintf(stderr, "Warning: Orphaned drive without device: "
-                    "id=%s,file=%s,if=%s,bus=%d,unit=%d\n",
-                    blk_name(blk), blk_bs(blk) ? blk_bs(blk)->filename : "",
-                    if_name[dinfo->type], dinfo->bus, dinfo->unit);
+            loc_push_none(&loc);
+            qemu_opts_loc_restore(dinfo->opts);
+            error_report("warning: machine type does not support this drive");
+            loc_pop(&loc);
             rs = true;
         }
     }
-- 
2.7.4