hooks: remove dhcpcd-base

[Meulengracht]

Cloud-init now pulls in dhcpcd-base, which we are not interested in (currently). After speaking with the Server team this is due to the fact that isc-dhcp-client is becoming deprecated, and replaced by dhcpcd. However cloud-init supports multiple dhcp clients and does not in fact need dhcpcd-base currently.

[alfonsosanchezbeato]

LGTM but please look at comment

[alfonsosanchezbeato]

nitpick: maybe a bug should be opened against cloud-init so they improve the packaging to make this optional, and then add the reference to the bug here.

[Meulengracht]

Tested that should anyone need dhcdpcd, they can include it in their snap and run dhcpcd as root. The user created by the package is not required for operating.

[holmanb]

However cloud-init supports multiple dhcp clients and does not in fact need dhcpcd-base currently.

@Meulengracht true, but cloud-init still requires a working dhcp client to be installed

nitpick: maybe a bug should be opened against cloud-init so they improve the packaging to make this optional, and then add the reference to the bug here.

@alfonsosanchezbeato Good point, but this was already considered. The Ubuntu deb packaging requires only dhcpcd-base because dhcpcd-base is expected to be the only client in main[1] on Noble that meets the needs of cloud-init. Since isc-dhcp-client isn't expected to remain in main in 24.04, there is no point as including it as an optional dependency.

Using the isc-dhcp-client is only expected on Ubuntu in the following cases 1) Ubuntu on series older than Noble and 2) Noble+ if the user manually installs isc-dhcp-client and then forces cloud-init to use it via a configuration setting. Since dhcpcd-base is included in the initramfs, ubuntu-minimal, etc[2], it is expected that on Noble and later, dhcpcd-base will always be available.

[1] 2 if you include busybox, but that is currently not fully supported yet

[2] various projects that made this transition off of isc-dhcp-client

$ apt rdepends dhcpcd-base
dhcpcd-base
Reverse Depends:
  Depends: cloud-init
 |Recommends: madwimax
 |Depends: libguestfs0
  Depends: dhcpcd
  Depends: ubuntu-minimal
  Depends: initramfs-tools-core