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fix(instances): a failed VM creation leaves no volumes behind

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Web form: the cache mode and the UEFI firmware value were checked only
after the disk volume had been created; an invalid one answered 500 and
left the volume. All checks now run before any allocation. Volumes the
request creates are removed on any failure up to the definition; ones
that cannot be removed are reported. After the definition the VM uses
them, so a later failure keeps them.

API: the new volume was never removed when the definition failed, and
the error was a 500. It is removed now and a libvirt error returns 400.
This commit is contained in:
catborise 2026-10-04 00:27:55 +03:00
parent 5def4e41fd
commit abdd229a1f
4 changed files with 337 additions and 158 deletions
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101
instances/api/viewsets.py
View file

@ -17,6 +17,7 @@ from instances.views import (
suspend,
)
from drf_spectacular.utils import extend_schema
from libvirt import libvirtError
from rest_framework import permissions, status, viewsets
from rest_framework.decorators import action
from rest_framework.response import Response
@ -266,49 +267,65 @@ class CreateInstanceViewSet(viewsets.ViewSet):
compute.type,
)
path = conn.create_volume(
serializer.validated_data["storage"],
serializer.validated_data["name"],
serializer.validated_data["hdd_size"],
default_disk_format,
serializer.validated_data["meta_prealloc"],
default_disk_owner_uid,
default_disk_owner_gid,
)
volume = {}
volume["device"] = "disk"
volume["path"] = path
volume["type"] = conn.get_volume_format_type(path)
volume["cache_mode"] = serializer.validated_data["cache_mode"]
volume["bus"] = default_bus
if volume["bus"] == "scsi":
volume["scsi_model"] = default_scsi_disk_model
volume["discard_mode"] = default_discard
volume["detect_zeroes_mode"] = default_zeroes
volume["io_mode"] = default_io
volume_list.append(volume)
with utils.libvirt_compute_lock(compute):
conn.create_instance(
name=serializer.validated_data["name"],
memory=serializer.validated_data["memory"],
vcpu=serializer.validated_data["vcpu"],
vcpu_mode=serializer.validated_data["vcpu_mode"],
uuid=util.randomUUID(),
arch=arch,
machine=machine,
firmware={},
volumes=volume_list,
networks=serializer.validated_data["networks"],
nwfilter=serializer.validated_data["nwfilter"],
virtio=serializer.validated_data["virtio"],
listener_addr=serializer.validated_data["listener_addr"],
video=serializer.validated_data["video"],
console_pass=serializer.validated_data["console_pass"],
mac=serializer.validated_data["mac"],
qemu_ga=serializer.validated_data["qemu_ga"],
path = None # the volume this request allocated
try:
path = conn.create_volume(
serializer.validated_data["storage"],
serializer.validated_data["name"],
serializer.validated_data["hdd_size"],
default_disk_format,
serializer.validated_data["meta_prealloc"],
default_disk_owner_uid,
default_disk_owner_gid,
)
volume = {}
volume["device"] = "disk"
volume["path"] = path
volume["type"] = conn.get_volume_format_type(path)
volume["cache_mode"] = serializer.validated_data["cache_mode"]
volume["bus"] = default_bus
if volume["bus"] == "scsi":
volume["scsi_model"] = default_scsi_disk_model
volume["discard_mode"] = default_discard
volume["detect_zeroes_mode"] = default_zeroes
volume["io_mode"] = default_io
volume_list.append(volume)
with utils.libvirt_compute_lock(compute):
conn.create_instance(
name=serializer.validated_data["name"],
memory=serializer.validated_data["memory"],
vcpu=serializer.validated_data["vcpu"],
vcpu_mode=serializer.validated_data["vcpu_mode"],
uuid=util.randomUUID(),
arch=arch,
machine=machine,
firmware={},
volumes=volume_list,
networks=serializer.validated_data["networks"],
nwfilter=serializer.validated_data["nwfilter"],
virtio=serializer.validated_data["virtio"],
listener_addr=serializer.validated_data["listener_addr"],
video=serializer.validated_data["video"],
console_pass=serializer.validated_data["console_pass"],
mac=serializer.validated_data["mac"],
qemu_ga=serializer.validated_data["qemu_ga"],
)
except Exception as err:
# R-08: a failed definition must not leave the new disk behind
if path:
try:
conn.delete_volume(path)
except libvirtError:
return Response(
{"status": f"{err}; remove {path} by hand"}, status=status.HTTP_400_BAD_REQUEST
)
if not isinstance(err, libvirtError):
raise
return Response({"status": str(err)}, status=status.HTTP_400_BAD_REQUEST)
# After the definition: the VM uses the volume, so no rollback here.
with utils.libvirt_compute_lock(compute):
utils.refresh_instance_database(compute)
msg = f"Instance {serializer.validated_data['name']} is created"
return Response({"status": msg})