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[Sofi <2006784@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When using DataSourceHetzner, there is a required dhcp lookup. This digs
down to a function named `maybe_perform_dhcp_discovery` which breaks
when a `which dhclient` does not return a binary. This raises a
`NoDHCPLeaseMissingDhclientError`.

I have only tested this under NixOS, as its one of the first
distributions to have have removed `dhclient` from its the package tree
following the deprecation by ISC's to the package.

DHCP lookups should be changed to support a non-deprecated dhcp library.


Cloud-provider: Hetzner

Cloud-init config:

```
system_info:
  distro: nixos
  network:
    renderers: [networkd]
users:
 - root

disable_root: false
preserve_hostname: false

cloud_init_modules:
 - set_hostname
 - update_hostname
 - update_etc_hosts
cloud_config_modules: []
cloud_final_modules: []

datasource_list:
 - DataSourceHetzner
```

Source where error is raised from:
https://github.com/canonical/cloud-init/blob/b3978cbd6c68c883f5ab02630d8d7fcb220b270c/cloudinit/net/dhcp.py#L69

End-of-life notice from ISC at 02 Jul 2021:
https://www.isc.org/blogs/dhcp-client-relay-eom/

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2006784

Title:
  dhcp lookups depend on end-of-life dhclient

Status in cloud-init:
  New

Bug description:
  When using DataSourceHetzner, there is a required dhcp lookup. This
  digs down to a function named `maybe_perform_dhcp_discovery` which
  breaks when a `which dhclient` does not return a binary. This raises a
  `NoDHCPLeaseMissingDhclientError`.

  I have only tested this under NixOS, as its one of the first
  distributions to have have removed `dhclient` from its the package
  tree following the deprecation by ISC's to the package.

  DHCP lookups should be changed to support a non-deprecated dhcp
  library.

  
  Cloud-provider: Hetzner

  Cloud-init config:

  ```
  system_info:
    distro: nixos
    network:
      renderers: [networkd]
  users:
   - root

  disable_root: false
  preserve_hostname: false

  cloud_init_modules:
   - set_hostname
   - update_hostname
   - update_etc_hosts
  cloud_config_modules: []
  cloud_final_modules: []

  datasource_list:
   - DataSourceHetzner
  ```

  Source where error is raised from:
  https://github.com/canonical/cloud-init/blob/b3978cbd6c68c883f5ab02630d8d7fcb220b270c/cloudinit/net/dhcp.py#L69

  End-of-life notice from ISC at 02 Jul 2021:
  https://www.isc.org/blogs/dhcp-client-relay-eom/

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