Systemd circular dependency

[Gauthier Jolly]

[ Impact ]

 * A systemd dependency cycle causes either cloud-init or the azure-proxy-agent service to be disabled automatically to resolve the conflict.

 * On VM images, this behavior causes a catastrophic failure as cloud-init is responsible for setting up networking, users, and sshd.

[ Test Plan ]

 * As described in this SRU exception: https://documentation.ubuntu.com/sru/en/latest/reference/exception-Azure-Proxy-Agent-Updates. The agent will be installed on a live image (before first boot) and CPC will run their test suites on Azure to verify that the VM behaves as expected and that no regression is introduced.

 * The Microsoft team responsible for this agent will also use their own tests to verify the new version.

[ Where problems could occur ]

 * Setting DefaultDependencies=no removes basic dependencies that systemd adds by default to a service. If the agent doesn't explicitly specify all its actual dependencies, it might fail to start in certain conditions.

[ Original Description ]

The agent sets Before=network-pre.target but doesn't set DefaultDependencies=no which is dangerous as it means that the service has to run after basic.target but while the networking is not configured. It's not always a problem but if another service depends on basic.target (default) and expects networking to be available (for example by specifying After=systemd-networkd-wait-online.service), a dependency cycle will appear.
On Ubuntu 22.04 and Ubuntu 24.04. This causing cloud-init to be disabled (thus provisioning to fail) if the azure-proxy-agent is pre-installed on a VM image:

Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found ordering cycle on cloud-init.service/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on systemd-networkd-wait-online.service/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on systemd-networkd.service/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on network-pre.target/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on azure-proxy-agent.service/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on basic.target/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Found dependency on sysinit.target/start
Sep 03 16:27:16 ubuntu systemd[1]: sysinit.target: Job cloud-init.service/start deleted to break ordering cycle starting with sysinit.target/start

[Launchpad Janitor (janitor)]

This bug was fixed in the package azure-proxy-agent - 1.0.30-0ubuntu5

---------------
azure-proxy-agent (1.0.30-0ubuntu5) questing; urgency=medium

  * d/p/fix-systemd-deps-cycle.patch: fix dependency cycle in the unit file.
    Use DefaultDependencies=no to remove the dependency on basic.target
    (LP: #2122345).

 -- Gauthier Jolly <email address hidden> Mon, 08 Sep 2025 10:26:17 +0200

[Andreas Hasenack (ahasenack)]

Please update the bug description with the SRU template.

[Andreas Hasenack (ahasenack)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into plucky-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu4~25.04.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-plucky to verification-done-plucky. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-plucky. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Andreas Hasenack (ahasenack)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu4~24.04.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Andreas Hasenack (ahasenack)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into jammy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu4~22.04.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-jammy to verification-done-jammy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-jammy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Miriam España Acebal (mirespace)]

During the verification steps, we identified a bug [1] in the devel (Questing) that affects these uploads. Therefore, I have marked them as blocked while we implement the fix.

[1] https://bugs.launchpad.net/ubuntu/+source/azure-proxy-agent/+bug/2125930

[Julian Andres Klode (juliank)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into plucky-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu6~25.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-plucky to verification-done-plucky. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-plucky. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Julian Andres Klode (juliank)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu6~24.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Julian Andres Klode (juliank)]

Hello Gauthier, or anyone else affected,

Accepted azure-proxy-agent into jammy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/azure-proxy-agent/1.0.30-0ubuntu6~22.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-jammy to verification-done-jammy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-jammy. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Julian Andres Klode (juliank)]

Removing the block-proposed-* tags as the fixed versions have been accepted