[pve-devel] [PATCH pve-firewall 1/2] Manually construct guest config path

[Stefan Lendl]

The issue arises because firewall depends on qemu-server but qemu-server
depends on SDN. So if I try to include firewall from SDN, it will not work.

I have looked at Firewall for quite some time now. Some functions in
Firewall.pm depend on QemuServer mainly for the parse_net function. I
tried to extract the functions that depend on QemuServer to another
package but I couldn't get the tests to pass.

Firewall.pm is using several global variables and I couldn't identify
what I missed.

Another option would be to split the SDN module to allow QemuServer to
depend only on a certain part of SDN to notify SDN about nic added to a
VM and VM start. I have not analyzed if it's possible to can split the
dependency cycle.

I don't see a clear path to implement this at this point and I will
focus on supporting Stefan Hanreich next week to finalize other aspects
of SDN for a successful release.

Thomas Lamprecht <t.lamprecht at proxmox.com> writes:

> Am 08/11/2023 um 12:35 schrieb Stefan Lendl:
>> Remove require QemuConfig from Firewall.pm
>> We only use it to construct the guest config paths.
>> Fixes circular include when accessing Firewall::Aliases from
>> pve-network.
>>
>
> This won't work as now cfs_read_file only works by luck, if at all, as the
> cfs_read_file needs the cfs_register_file that happens in PVE::QemuServer
> so that the parser is actually available...
>
> I'd much rather see Firewall be split-up than doing broken hacks and
> switching from one of our saner interfaces to manual assembly.