Re: [PATCH v2 10/22] src: add new APIs for marking a domain to autostart once

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On Wed, Mar 12, 2025 at 17:17:50 +0000, Daniel P. Berrangé wrote:
> When a domain is marked for autostart, it will be started on every
> subsequent host OS boot. There may be times when it is desirable to
> mark a domain to be autostarted, on the next boot only.
> 
> Thus we add virDomainSetAutostartOnce / virDomainGetAutostartOnce.
> 
> An alternative would have been to overload the existing
> virDomainSetAutostart method, to accept values '1' or '2' for
> the autostart flag. This was not done because it is expected
> that language bindings will have mapped the current autostart
> flag to a boolean, and thus turning it into an enum would create
> a compatibility problem.
> 
> A further alternative would have been to create a new method
> virDomainSetAutostartFlags, with a VIR_DOMAIN_AUTOSTART_ONCE
> flag defined. This was not done because it is felt desirable
> to clearly separate the two flags. Setting the "once" flag
> should not interfere with existing autostart setting, whether
> it is enabled or disabled currently.
> 
> The 'virsh autostart' command, however, is still overloaded
> by just adding a --once flag, while current state is added
> to 'virsh dominfo'.
> 
> No ability to filter by 'autostart once' status is added to
> the domain list APIs. The most common use of autostart once
> will be to automatically set it on host shutdown, and it be
> cleared on host startup. Thus there would rarely be scenarios
> in which a running app will need to filter on this new flag.
> 
> Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
> ---
>  include/libvirt/libvirt-domain.h |  4 ++
>  src/driver-hypervisor.h          | 10 ++++
>  src/libvirt-domain.c             | 87 ++++++++++++++++++++++++++++++++
>  src/libvirt_public.syms          |  6 +++
>  src/remote/remote_driver.c       |  2 +
>  src/remote/remote_protocol.x     | 30 ++++++++++-
>  src/remote_protocol-structs      | 12 +++++
>  src/rpc/gendispatch.pl           |  4 +-
>  tools/virsh-domain-monitor.c     |  7 +++
>  tools/virsh-domain.c             | 39 ++++++++++----
>  10 files changed, 189 insertions(+), 12 deletions(-)

Reviewed-by: Peter Krempa <pkrempa@xxxxxxxxxx>




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