Added:
post_volume_create & post_volume_import as requested by Marek
Removed:
post_ctor as this wasn't really useful anyway, but required a lot of
sync code. Without it, some refactoring & potential async improvements
became possible.
This reverts commit 287a4a0429.
As Marek correctly pointed out, sync functions cannot be run async against one another even if run inside an async function
(the python interpreter will remain active until the next yield and that's at the end of the sync func / inside the async function).
--> So there's no need for a lock.
I still cannot protect against assumptions made by sync code authors about blocking the Qubes OS main loop. Those will be broken.
Moreover the code of this commit was botched anyway.
- Removed all own class attributes to avoid name clashes with delegated
class attributes.
- Implemented the previously missing Pool.usage_details property.
- Shadowed all class attributes as instance properties. This is required
as the parent classes enforce the class attributes upon the
CallbackPool & CallbackVolume classes, but they need to be delegated to
the class of the _cb_impl object. We also cannot implement them as class
attributes in CallbackVolume & CallbackPool as they need to work for
arbitrary backend drivers and two backend drivers must not interfere with
each other. Possible alternative: One could dynamically create classes.
Unfortunately this appears to be necessary due to
various Qubes OS `assert` checks and to get `__str__()` et al
from the super class. It also means that we have to implement
all methods of the super class (in the future as well).
Now Volume.export() may be a coroutine and also may be accompanied by
Volume.export_end() cleaning up after it.
See previous commits for building blocks for this.
This commit adjusts usage of Volume.export() and adds matching
Volume.export_end() throughout the code base.
FixesQubesOS/qubes-issues#5935
This is a counterpart to Volume.export(). Up until now, no driver needed
any cleanup after exporting data, but it doesn't mean there won't be
any. This is especially relevant because Volume.export() is supposed to
return a path of a snapshot from before VM start - which may be a
different one than currently active one.
QubesOS/qubes-issues#5935
Avoid local modification in a pool's init_volume influence
vm.volume_config. Currently every pool driver replaces
volume_config['pool'] with a pool object (instead of name) and it leads
to confusing cases where depending on start stage, it is sometimes an
object and sometimes a string.
Additionally, some pool drivers may modify volume_config in unexpected
way - for example test pool driver removes 'pool' entry entirely. Avoid
this fragile interface by giving pool driver a copy of volume_config,
instead of vm.volume_config directly.
Note one side effect is that 'vid' (and other pool-specific parameters)
is not set into vm.volume_config directly after creating a VM, but
possibly only after loading from XML. This should not be an issue in
theory (no core code should expect it), but if some place use
volume_config instead of Volume instance for getting pool-specific
options, it should be fixed.
Don't update _size in the getter, so it can be unlocked (which is
helpful for QubesOS/qubes-issues#5935).
!!! If cherry-picking for release4.0, also adjust import_data() to !!!
!!! use self.size (no underscore) instead of self._get_size() !!!
Volume with save_on_stop=False and snap_on_start=False exists only when
VM is running and this is already handled under is_dirty() condition.
For non-running VMs, skip LVM resize step and only update internal size
attribute.
FixesQubesOS/qubes-issues#5645
When volume is resized, underlying LVM is adjusted if exists. For
persistent volumes it is enough, as generally the driver prefers
underlying LVM size than internal attribute. But volatile volume is
removed at vm shutdown, so that value is lost.
Fix it by updating Volume.size attribute too, to be updated in qubes.xml
later too.
FixesQubesOS/qubes-issues#5645
Ensure that there are no leftover image files for the volume, e.g. from
an unsuccessful removal of a previous incarnation of this vid, or from
an messily restored pool filesystem backup. We don't want to preserve
any stale data (revisions) or metadata (size) in the new incarnation.
