iotests/172: Cover -global floppy.drive=...

Use of -global to set a default backend for non-singleton devices is a
bad idea.  But as long as we permit it, we better test it.

Test output demonstrates we screw up when -global floppy clashes with
-fda or with -device floppy: according to "info qtree", only the
latter backend is attached, but according to "info block", both are.
Here's the clash with -device:

    Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global floppy.drive=none0 -device floppy,drive=none1,unit=0

              dev: isa-fdc, id ""
                [...]
                driveA = ""
                driveB = ""
                [...]
                bus: floppy-bus.0
                  type floppy-bus
                  dev: floppy, id ""
                    unit = 0 (0x0)
--->                drive = "none1"
    [...]
    none0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
--->    Attached to:      /machine/peripheral-anon/device[0]
        Cache mode:       writeback

    none1 (NODE_NAME): TEST_DIR/t.qcow2.2 (qcow2)
--->    Attached to:      /machine/peripheral-anon/device[0]
        Removable device: not locked, tray closed
        Cache mode:       writeback

/machine/peripheral-anon/device[0] is the floppy created with -device.

Test output further demonstrates the "Drive 'FOO' is already in use
because it has been automatically connected to another device" error
message can be misleading.  With '-fda "" -global
floppy.drive=floppy0', it's in use because -global reuses -fda's
backend.  There is no other device involved.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200622094227.1271650-4-armbru@redhat.com>

tests/qemu-iotests/172

@@ -151,6 +151,7 @@ check_floppy_qtree -fdb "$TEST_IMG" -drive if=none,file="$TEST_IMG.2" -global is
 # Conflicting (-fdX wins)
 check_floppy_qtree -fda "$TEST_IMG" -drive if=none,file="$TEST_IMG.2" -global isa-fdc.driveA=none0
 check_floppy_qtree -fdb "$TEST_IMG" -drive if=none,file="$TEST_IMG.2" -global isa-fdc.driveB=none0
+check_floppy_qtree -fda "$TEST_IMG" -drive if=none,file="$TEST_IMG.2" -global floppy.drive=none0
 
 echo
 echo
@@ -192,12 +193,16 @@ check_floppy_qtree -drive if=none,file="$TEST_IMG" -drive if=none,file="$TEST_IM
                    -global isa-fdc.driveB=none0 -device floppy,drive=none1
 check_floppy_qtree -drive if=none,file="$TEST_IMG" -drive if=none,file="$TEST_IMG.2" \
                    -global isa-fdc.driveB=none0 -device floppy,drive=none1,unit=0
+check_floppy_qtree -drive if=none,file="$TEST_IMG" \
+                   -global floppy.drive=none0 -device floppy,unit=0
 
 # Conflicting
 check_floppy_qtree -drive if=none,file="$TEST_IMG" -drive if=none,file="$TEST_IMG.2" \
                    -global isa-fdc.driveA=none0 -device floppy,drive=none1,unit=0
 check_floppy_qtree -drive if=none,file="$TEST_IMG" -drive if=none,file="$TEST_IMG.2" \
                    -global isa-fdc.driveB=none0 -device floppy,drive=none1,unit=1
+check_floppy_qtree -drive if=none,file="$TEST_IMG" -drive if=none,file="$TEST_IMG.2" \
+                   -global floppy.drive=none0 -device floppy,drive=none1,unit=0
 
 echo
 echo
@@ -205,8 +210,10 @@ echo === Attempt to use drive twice ===
 
 # if=none
 check_floppy_qtree -drive if=none -device floppy,drive=none0 -device floppy -device floppy,drive=none0
+check_floppy_qtree -drive if=none -global floppy.drive=none0 -device floppy -device floppy
 # if=floppy
 check_floppy_qtree -fda "" -device floppy,drive=floppy0
+check_floppy_qtree -fda "" -global floppy.drive=floppy0
 # default if=floppy (not found, because it's created later)
 check_floppy_qtree -device floppy,drive=floppy0
 

tests/qemu-iotests/172.out

@@ -860,6 +860,50 @@ sd0: [not inserted]
 (qemu) quit
 
 
+Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global floppy.drive=none0
+
+          dev: isa-fdc, id ""
+            iobase = 1008 (0x3f0)
+            irq = 6 (0x6)
+            dma = 2 (0x2)
+            driveA = ""
+            driveB = ""
+            check_media_rate = true
+            fdtypeA = "auto"
+            fdtypeB = "auto"
+            fallback = "288"
+            isa irq 6
+            bus: floppy-bus.0
+              type floppy-bus
+              dev: floppy, id ""
+                unit = 0 (0x0)
+                drive = "floppy0"
+                logical_block_size = 512 (0x200)
+                physical_block_size = 512 (0x200)
+                min_io_size = 0 (0x0)
+                opt_io_size = 0 (0x0)
+                discard_granularity = 4294967295 (0xffffffff)
+                write-cache = "auto"
+                share-rw = false
+                drive-type = "144"
+floppy0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+    Attached to:      /machine/unattached/device[15]
+    Removable device: not locked, tray closed
+    Cache mode:       writeback
+
+none0 (NODE_NAME): TEST_DIR/t.qcow2.2 (qcow2)
+    Attached to:      /machine/unattached/device[15]
+    Cache mode:       writeback
+
+ide1-cd0: [not inserted]
+    Attached to:      /machine/unattached/device[22]
+    Removable device: not locked, tray closed
+
+sd0: [not inserted]
+    Removable device: not locked, tray closed
+(qemu) quit
+
+
 
 === Mixing -fdX and -device ===
 
@@ -1438,21 +1482,111 @@ sd0: [not inserted]
 (qemu) quit
 
 
+Testing: -drive if=none,file=TEST_DIR/t.qcow2 -global floppy.drive=none0 -device floppy,unit=0
+
+          dev: isa-fdc, id ""
+            iobase = 1008 (0x3f0)
+            irq = 6 (0x6)
+            dma = 2 (0x2)
+            driveA = ""
+            driveB = ""
+            check_media_rate = true
+            fdtypeA = "auto"
+            fdtypeB = "auto"
+            fallback = "288"
+            isa irq 6
+            bus: floppy-bus.0
+              type floppy-bus
+              dev: floppy, id ""
+                unit = 0 (0x0)
+                drive = "none0"
+                logical_block_size = 512 (0x200)
+                physical_block_size = 512 (0x200)
+                min_io_size = 0 (0x0)
+                opt_io_size = 0 (0x0)
+                discard_granularity = 4294967295 (0xffffffff)
+                write-cache = "auto"
+                share-rw = false
+                drive-type = "144"
+none0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+    Attached to:      /machine/peripheral-anon/device[0]
+    Removable device: not locked, tray closed
+    Cache mode:       writeback
+
+ide1-cd0: [not inserted]
+    Attached to:      /machine/unattached/device[21]
+    Removable device: not locked, tray closed
+
+sd0: [not inserted]
+    Removable device: not locked, tray closed
+(qemu) quit
+
+
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global isa-fdc.driveA=none0 -device floppy,drive=none1,unit=0
 QEMU_PROG: -device floppy,drive=none1,unit=0: Floppy unit 0 is in use
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global isa-fdc.driveB=none0 -device floppy,drive=none1,unit=1
 QEMU_PROG: -device floppy,drive=none1,unit=1: Floppy unit 1 is in use
 
+Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global floppy.drive=none0 -device floppy,drive=none1,unit=0
+
+          dev: isa-fdc, id ""
+            iobase = 1008 (0x3f0)
+            irq = 6 (0x6)
+            dma = 2 (0x2)
+            driveA = ""
+            driveB = ""
+            check_media_rate = true
+            fdtypeA = "auto"
+            fdtypeB = "auto"
+            fallback = "288"
+            isa irq 6
+            bus: floppy-bus.0
+              type floppy-bus
+              dev: floppy, id ""
+                unit = 0 (0x0)
+                drive = "none1"
+                logical_block_size = 512 (0x200)
+                physical_block_size = 512 (0x200)
+                min_io_size = 0 (0x0)
+                opt_io_size = 0 (0x0)
+                discard_granularity = 4294967295 (0xffffffff)
+                write-cache = "auto"
+                share-rw = false
+                drive-type = "144"
+none0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+    Attached to:      /machine/peripheral-anon/device[0]
+    Cache mode:       writeback
+
+none1 (NODE_NAME): TEST_DIR/t.qcow2.2 (qcow2)
+    Attached to:      /machine/peripheral-anon/device[0]
+    Removable device: not locked, tray closed
+    Cache mode:       writeback
+
+ide1-cd0: [not inserted]
+    Attached to:      /machine/unattached/device[21]
+    Removable device: not locked, tray closed
+
+sd0: [not inserted]
+    Removable device: not locked, tray closed
+(qemu) quit
+
+
 
 === Attempt to use drive twice ===
 
 Testing: -drive if=none -device floppy,drive=none0 -device floppy -device floppy,drive=none0
 QEMU_PROG: -device floppy,drive=none0: Drive 'none0' is already in use by another device
 
+Testing: -drive if=none -global floppy.drive=none0 -device floppy -device floppy
+QEMU_PROG: -device floppy: can't apply global floppy.drive=none0: Drive 'none0' is already in use by another device
+
 Testing: -fda  -device floppy,drive=floppy0
 QEMU_PROG: -device floppy,drive=floppy0: Drive 'floppy0' is already in use because it has been automatically connected to another device (did you need 'if=none' in the drive options?)
 
+Testing: -fda  -global floppy.drive=floppy0
+QEMU_PROG: can't apply global floppy.drive=floppy0: Drive 'floppy0' is already in use because it has been automatically connected to another device (did you need 'if=none' in the drive options?)
+
 Testing: -device floppy,drive=floppy0
 QEMU_PROG: -device floppy,drive=floppy0: Property 'floppy.drive' can't find value 'floppy0'