Files
moby/daemon
John Howard efdad53744 Windows: DetachVhd attempt in cleanup
Signed-off-by: John Howard <jhoward@microsoft.com>

This is a fix for a few related scenarios where it's impossible to remove layers or containers
until the host is rebooted. Generally (or at least easiest to repro) through a forced daemon kill
while a container is running.

Possibly slightly worse than that, as following a host reboot, the scratch layer would possibly be leaked and
left on disk under the dataroot\windowsfilter directory after the container is removed.

One such example of a failure:

1. run a long running container with the --rm flag
docker run --rm -d --name test microsoft/windowsservercore powershell sleep 30
2. Force kill the daemon not allowing it to cleanup. Simulates a crash or a host power-cycle.
3. (re-)Start daemon
4. docker ps -a
PS C:\control> docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                PORTS               NAMES
7aff773d782b        malloc              "powershell start-sl…"   11 seconds ago      Removal In Progress                       malloc
5. Try to remove
PS C:\control> docker rm 7aff
Error response from daemon: container 7aff773d782bbf35d95095369ffcb170b7b8f0e6f8f65d5aff42abf61234855d: driver "windowsfilter" failed to remove root filesystem: rename C:\control\windowsfilter\7aff773d782bbf35d95095369ffcb170b7b8f0e6f8f65d5aff42abf61234855d C:\control\windowsfilter\7aff773d782bbf35d95095369ffcb170b7b8f0e6f8f65d5aff42abf61234855d-removing: Access is denied.
PS C:\control>

Step 5 fails.
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