home interface plug attribute "read: all" triggers ValidationError
Metadata
Current evaluation
Untriaged report that Snapcraft rejects app-level home plug attributes such as read: all despite documented snapd support; the reproducer contains conflicting list and scalar syntax.
Suggested action: needs triage
Reason: The report provides a complete project and traceback, and the current generated schema still defines app plugs as an array, while explicitly linking snapd PR #5016 as the source of read-all support. However, it has no labels, maintainer response, or assignee, and its YAML uses read: [all] while the snapd warning explicitly requires the scalar read: all, so the intended supported syntax needs assessment.
Evaluated by: mr-cal-bot
Impact:
40
Quick Win:
14
Complexity:
45
Confidence:
78
Actionability:
65
Issue body
### Bug Description
Snapcraft fails to compile a snap when trying to use the home interface plug attribute "read: all".
This ValidationError is thrown: `Input should be a valid list [type=list_type, input_value={'home': {'read': ['all']}}, input_type=dict]`.
The "read: all" feature seems to be introduced by [this MR](https://github.com/canonical/snapd/pull/5016), and is documented in the [home interfaces](https://snapcraft.io/docs/home-interface) doc. Its description is "read (plug): optional, when set to ‘all’, also allows reading non-hidden files in the home directories of all users as traditional file permissions allow."
If the plug is defined separately, a warning is issued: INFO snap "os-release" has bad plugs or slots: home-all (home plug requires "read" be 'all'), but no access to home is given. Ie,
```
plugs:
home-all:
interface: home
read: [all]
```
### To Reproduce
Try to build a snap (ie, simple example provided below, taken from [snapcraft docs](https://snapcraft.io/docs/defining-a-command)) using the home interface's read attribute:
```
plugs:
home:
read: all
```
### Environment
Ubuntu 24.04, LXD
### snapcraft.yaml
```yaml
name: os-release
base: core22
version: '0.2'
summary: Outputs the contents of /etc/os-release
description: Prints the contents of os-release
grade: stable
confinement: strict
apps:
part-os-release:
command: bin/os-release.sh
plugs:
home:
read: [all]
parts:
part-os-release:
plugin: dump
source: .
organize:
os-release.sh: bin/
```
### Relevant log output
```shell
$ snapcraft
Traceback (most recent call last):
File "/snap/snapcraft/13008/bin/snapcraft", line 8, in <module>
sys.exit(main())
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/application.py", line 485, in main
return cli.run()
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/cli.py", line 252, in run
_run_dispatcher(dispatcher, global_args)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/cli.py", line 225, in _run_dispatcher
dispatcher.run()
File "/snap/snapcraft/13008/lib/python3.10/site-packages/craft_cli/dispatcher.py", line 494, in run
return self._loaded_command.run(self._parsed_command_args)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/commands/core22/lifecycle.py", line 266, in run
super().run(parsed_args)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/commands/core22/lifecycle.py", line 139, in run
parts_lifecycle.run(self.name, parsed_args)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/parts/lifecycle.py", line 102, in run
project = models.Project.unmarshal(yaml_data_for_arch)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/craft_application/models/base.py", line 61, in unmarshal
return cls.model_validate(data)
File "/snap/snapcraft/13008/lib/python3.10/site-packages/pydantic/main.py", line 596, in model_validate
return cls.__pydantic_validator__.validate_python(
pydantic_core._pydantic_core.ValidationError: 1 validation error for Project
apps.part-os-release.plugs
Input should be a valid list [type=list_type, input_value={'home': {'read': ['all']}}, input_type=dict]
For further information visit https://errors.pydantic.dev/2.9/v/list_type
```
### Additional context
_No response_
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| stealth/space-bunny-alpha |
Impact:
40
Quick Win:
14
Complexity:
45
Confidence:
78
Actionability:
65
|
needs triage | Untriaged report that Snapcraft rejects app-level home plug attributes such as read: all despite documented snapd support; the reproducer contains conflicting list and scalar syntax. | |
| qwen/qwen3.6-35b-a3b |
Impact:
80
Quick Win:
58
Complexity:
20
Confidence:
90
Actionability:
90
|
keep open | Snapcraft fails to validate `plugs` dictionary when using `home` interface with `read: [all]`, throwing a Pydantic ValidationError expecting a list instead of a dict. | |
| qwen/qwen3.8-27b |
Impact:
50
Quick Win:
32
Staleness:
85
Complexity:
35
Confidence:
70
Support Request:
10
|
needs triage | Snapcraft rejects home interface plug attribute read: all with a pydantic ValidationError (expects list, got dict). Reported on core22; no maintainer response, no labels, no activity in ~2 years. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
90
Complexity:
30
Confidence:
85
Support Request:
10
|
needs triage | Unassessed bug report where using the read: all attribute in the home interface plug causes a Pydantic ValidationError in snapcraft. No maintainer response or labels after 591 days. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
95
Complexity:
30
Confidence:
85
Support Request:
10
|
close stale | Snapcraft throws a ValidationError when using the 'read: all' attribute on the home interface plug. Open for 577 days with no maintainer response or labels. |
Update history
No update history recorded yet.
Related work
-
Related To:
snapd#5016
(confidence 98%)
The report explicitly identifies this snapd change as introducing the home interface read-all feature.
Related issues
No related issues found above the similarity threshold.