feat(26.04): add ethtool

[Meulengracht]

Proposed changes

Add ethtool for Ubuntu Core 26

Checklist

• I have read the contributing guidelines
• I have tested my changes (see how)
• I have already submitted the CLA form

[lczyk]

• blocked on ci error preparing lxd machine in test #828. working on a fix. for now cancelled the integration tests as they would never succeed and eventually time out, and they were taking up worker allocation. will re-trigger when ci is back to a working state. apologies for the inconvenience!

[lczyk]

• ci error preparing lxd machine in test #828 resolved. removing 'blocked' and updating with the base branch

[github-actions]

Test Coverage

Average Total Coverage: 66.67%

---

Arch: aarch64

Coverage: 66.67%

ethtool: 🌂 66.67% (1 missing)

ethtool_network-if-hooks

---

Arch: x86_64

Coverage: 66.67%

ethtool: 🌂 66.67% (1 missing)

ethtool_network-if-hooks

[alesancor1]

These are scripts and we should test them.

Also I can see these scripts check for /usr/sbin/ethtool so ethtool_bins should be included in the essential of this slice.

[Meulengracht]

Testing the behavior of the scripts via ifup/ifdown inside a chroot is usually brittle (needs ifupdown installed/configured, interface state, env vars, etc.), so I would not think it's the best idea, but I can maybe add tests if we really want them tested.

[lczyk]

i'd at the very least run them with some mocked /usr/sbin/ethtool (or even without it, since the scripts seem to test -x $ETHTOOL || exit 0), just to check they run.

see #881 (comment)

[lczyk]

( obviously if you can test them more then please do :) , but yeah, there is a point at which you've testing /usr/sbin/ethtool and not these scripts )

[lczyk]

Suggested change

	essential:
	- ethtool_bins
	essential:
	- base-files_bin
	- dash_bins
	- ethtool_bins
	- sed_bins

these require dash to run + the shebang references /bin/sh so they need the symlink from base files + if-up.d/ethtool wants sed