[libvirt] [PATCH 05/12] nodedev: acquire a pidfile in the driver root directory

[Michal Privoznik]

On 7/10/19 5:47 PM, Daniel P. Berrangé wrote:
> When we allow multiple instances of the driver for the same user
> account, using a separate root directory, we need to ensure mutual
> exclusion. Use a pidfile to guarantee this.
> 
> In privileged libvirtd this ends up locking
> 
>     /var/run/libvirt/nodedev/driver.pid
> 
> In unprivileged libvirtd this ends up locking
> 
>    /run/user/$UID/libvirt/nodedev/run/driver.pid
> 
> NB, the latter can vary depending on $XDG_RUNTIME_DIR
> 
> Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
> ---
>   src/conf/virnodedeviceobj.h        |  5 +++++
>   src/node_device/node_device_hal.c  | 31 +++++++++++++++++++++++++++++
>   src/node_device/node_device_udev.c | 32 ++++++++++++++++++++++++++++++
>   3 files changed, 68 insertions(+)

Side note, isn't it time to finally kill hal backend? Is somebody still 
using it?

Michal