xapi-project / xen-api / 18735398454
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CP-54471 Configure Dom0 NTP via XAPI (#6689)

New filed: `host.ntp_mode`, `host.ntp_custom_servers`
New API: `host.set_ntp_mode`, `host.set_ntp_custom_servers`,
`host.get_ntp_mode`, `host.get_ntp_custom_servers`,
`host.get_ntp_servers_status`.

**ntp_mode_dhcp**: In this mode, ntp uses the dhcp assigned ntp servers
as sources. In Dom0, dhclient triggers `chrony.sh` to update the ntp
servers when network event happens. It writes ntp servers to
`/run/chrony-dhcp/$interface.sources` and the dir `/run/chrony-dhcp` is
included in `chrony.conf`. The dhclient also stores dhcp lease in
`/var/lib/xcp/dhclient-$interface.leases`, see
https://github.com/xapi-project/xen-api/blob/v25.31.0/ocaml/networkd/lib/network_utils.ml#L925.
When switch ntp mode to dhcp, XAPI checks the lease file and finds ntp
server then fills chrony-dhcp file. The exec permission of `chrony.sh`
is added. When swith ntp mode from dhcp to others, XAPI removes the
chrony-dhcp files and the exec permission of `chrony.sh`. The operation
is same with xsconsole
https://github.com/xapi-project/xsconsole/blob/v11.1.1/XSConsoleData.py#L593.
In this feature, xsconsole will change to use XenAPI to manage ntp later
to avoid conflict.

**ntp_mode_custom**: In this mode, ntp uses `host.ntp_custom_servers` as
sources. This is implemented by changing `chrony.conf` and restart
chronyd. `host.ntp_custom_servers` is set by the user.

**ntp_mode_default**: In this mode, ntp uses default-ntp-servers in XAPI
config file.

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