fix: don't change the systemd default from shared

[ae-govau]

If the default is private, then if namespaced services (like auditd/chronyd) are restarted after the persistent disk is mounted, then it is not possible to fully unmount that disk until those services are stopped. The system will appear to let you do so, however the device remains busy and subsequent attempts to remount (as read-only) will fail as the device is busy.

Fixes #310

There's probably a test that could be written to confirm it this is not added, however I don't know the DSL that Ruby is using for that and probably won't pick up for this one change.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: ae-govau (1ed0b0d0346a289c076e0bc412617be330abf0a9)

[ae-govau]

CLA

This is a trivial change, and getting an authorized person to sign a CLA on my side will likely be onerous. Can this please be accepted as trivial and not requiring a CLA, or can a maintainer kindly reimplement the relevant deletion?

[jpalermo]

CLA is unfortunately required and I don't think there is much flexibility on that. Could you do this in your "free time" and sign the CLA just as yourself?

Bionic is also not built from the jammy branch, so the bionic guard shouldn't be needed.

[ae-govau]

Have updated the PR to drop the bionic guard, and it's now a delete only PR.

[ae-govau]

CLA is now signed.

[ramonskie]

@jpalermo would it be a good idea to let the garden team look at it as well. as they probably have more test scenarios

[beyhan]

@ae-govau Thanks for the contribution!

[bgandon]

Just a quick testimony: with the Stemcell v1.351 that ships this PR, the blocking issues I had with Concourse on Bosh-Lite seems to be fixed.

Thank you all 👏