fu_dfu_tool_get_default_device returns a newly create FuDfuDevice
'device'; but since it is marked as g_autoptr, it is destroyed when
leaving the scope and the caller receives garbage.
So steal the pointer before leaving the scope.
,----
| ==697985== Invalid read of size 8
| ==697985== at 0x4B50F49: g_type_check_instance_is_fundamentally_a (gtype.c:4080)
| ==697985== by 0x4B3A988: g_object_unref (gobject.c:3421)
| ==697985== by 0x406CF3: glib_autoptr_clear_GObject (gobject-autocleanups.h:27)
| ==697985== by 0x406DD5: glib_autoptr_clear_FwupdDevice (gusb-autocleanups.h:17)
| ==697985== by 0x406E9C: glib_autoptr_clear_FuDevice (fu-device.h:18)
| ==697985== by 0x406EE3: glib_autoptr_clear_FuUsbDevice (fu-usb-device.h:22)
| ==697985== by 0x406F6A: glib_autoptr_clear_FuDfuDevice (fu-dfu-device.h:19)
| ==697985== by 0x406F88: glib_autoptr_cleanup_FuDfuDevice (fu-dfu-device.h:19)
| ==697985== by 0x40898D: fu_dfu_tool_read (fu-dfu-tool.c:577)
| ==697985== by 0x407518: fu_dfu_tool_run (fu-dfu-tool.c:162)
| ==697985== by 0x4097E0: main (fu-dfu-tool.c:959)
| ==697985== Address 0x67fbfe0 is 640 bytes inside a block of size 672 free'd
| ==697985== at 0x48430E4: free (vg_replace_malloc.c:755)
| ==697985== by 0x4BD124C: g_free (gmem.c:199)
| ==697985== by 0x4BEB76F: g_slice_free1 (gslice.c:1180)
| ==697985== by 0x4B4FDBB: g_type_free_instance (gtype.c:1993)
| ==697985== by 0x406CF3: glib_autoptr_clear_GObject (gobject-autocleanups.h:27)
| ==697985== by 0x406DD5: glib_autoptr_clear_FwupdDevice (gusb-autocleanups.h:17)
| ==697985== by 0x406E9C: glib_autoptr_clear_FuDevice (fu-device.h:18)
| ==697985== by 0x406EE3: glib_autoptr_clear_FuUsbDevice (fu-usb-device.h:22)
| ==697985== by 0x406F6A: glib_autoptr_clear_FuDfuDevice (fu-dfu-device.h:19)
| ==697985== by 0x406F88: glib_autoptr_cleanup_FuDfuDevice (fu-dfu-device.h:19)
| ==697985== by 0x407762: fu_dfu_tool_get_default_device (fu-dfu-tool.c:191)
| ==697985== by 0x408736: fu_dfu_tool_read (fu-dfu-tool.c:592)
| ==697985== Block was alloc'd at
| ==697985== at 0x484086F: malloc (vg_replace_malloc.c:380)
| ==697985== by 0x4BD4938: g_malloc (gmem.c:106)
| ==697985== by 0x4BEC1F4: g_slice_alloc (gslice.c:1069)
| ==697985== by 0x4BEC85D: g_slice_alloc0 (gslice.c:1095)
| ==697985== by 0x4B5511A: g_type_create_instance (gtype.c:1893)
| ==697985== by 0x4B3CB8C: g_object_new_internal (gobject.c:1939)
| ==697985== by 0x4B3E107: g_object_new_valist (gobject.c:2282)
| ==697985== by 0x4B3E63C: g_object_new (gobject.c:1782)
| ==697985== by 0x40B0CF: fu_dfu_device_new (fu-dfu-device.c:571)
| ==697985== by 0x407723: fu_dfu_tool_get_default_device (fu-dfu-tool.c:230)
| ==697985== by 0x408736: fu_dfu_tool_read (fu-dfu-tool.c:592)
| ==697985== by 0x407518: fu_dfu_tool_run (fu-dfu-tool.c:162)
`----
We were seeing:
,----
| (dfu-tool:1139827): GLib-WARNING **: 17:34:42.671: GError set over the top of a previous GError or uninitialized memory.
| This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
| The overwriting error message was: no device matches for 1234:abcd
`----
This is because we were attempting to overwrite libgusb's error with one
for fwupd, and glib rightfully complains. So let's prefix it instead.
There is a lot of code in fwupd that just assigns a shared object type to
a FuPlugin, and then for each device on that plugin assigns that same shared
object to each FuDevice.
Rather than proxy several kinds of information stores over two different levels
of abstraction create a 'context' which contains the shared *system* state
between the daemon, the plugins and the daemon.
This will allow us to hold other per-machine state in the future, for instance
the system battery level or AC state.
This allows us to 'nest' firmware formats, and removes a ton of duplication.
The aim here is to deprecate FuFirmwareImage -- it's almost always acting
as a 'child' FuFirmware instance, and even copies most of the vfuncs to allow
custom types. If I'm struggling to work out what should be a FuFirmware and
what should be a FuFirmwareImage then a plugin author has no hope.
For simple payloads we were adding bytes into an image and then the image into
a firmware. This gets really messy when most plugins are treating the FuFirmware
*as* the binary firmware file.
The GBytes saved in the FuFirmware would be considered the payload with the
aim of not using FuFirmwareImage in the single-image case.
