** Changed in: cloud-init (Ubuntu)
Status: New => Triaged
** Changed in: cloud-init (Ubuntu)
Importance: Undecided => Medium
** Description changed:
MAAS uses curtin to create a cloud-init configuration using curtin's
debconf_selections. Cloud-init's postinst script generates the preseed
configuration based on debconf settings.
This design is undesirable for several reasons:
1. this design unnecessarily requires a distro-specific dependency: debconf
2. this design unnecessarily requires that a duplicate implementation exist
in MAAS for Ubuntu core[1][2] and other distros
3. this design obscures project boundaries by hiding MAAS / curtin
functionality in cloud-init's packaging shell scripts[3][4]
It would be preferable to use the same (distro-agnostic) method
everywhere. This code path already exists for non-Ubuntu distros and (if
it works) would be much preferable to use everywhere.
This would reduce maintenance burden:
- 1. it will eliminate duplicate code paths: which may diverge over time
+ 1. it will eliminate duplicate code paths[5]: which may diverge over time
2. it will eliminate hacky shell postinst logic : this would be better
implemented in a more maintainable repo/language
- 3. it will clarify project boundaries and ownership of functionality: this
functionality cannot currently be verified by the cloud-init team[5] - a
cloud-init devel release is required, followed by MAAS CI runs
+ 3. it will clarify project boundaries and ownership of functionality: this
functionality cannot currently be verified by the cloud-init team[6] - a
cloud-init devel release is required, followed by MAAS CI runs
[1]
https://github.com/canonical/maas/blob/5f6f9d61ae3638c8fa89d0c73e0368a55145667c/src/maasserver/preseed.py#L154
[2]
https://github.com/canonical/curtin/blob/a5e8e4ad5c600af9f95e2cecf644d824ca0489e2/curtin/commands/curthooks.py#L1858
[3]
https://github.com/canonical/cloud-init/blob/ubuntu/devel/debian/cloud-init.postinst#L54
[4] https://github.com/canonical/cloud-init/issues/5685
- [5] https://github.com/canonical/cloud-init/issues/5688
- [6]
https://github.com/canonical/cloud-init/issues/5685#issuecomment-2342036576
+ [5]
https://github.com/canonical/cloud-init/issues/5685#issuecomment-2342036576
+ [6] https://github.com/canonical/cloud-init/issues/5688
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https://bugs.launchpad.net/bugs/2080892
Title:
MAAS requires debconf for cloud-init preseed on Ubuntu
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