Failed to upload snap created with `assumes: - command-chain`
Metadata
Current evaluation
Snapcraft duplicates 'command-chain' in assumes when user already lists it, causing snap store upload to fail schema validation. Triaged and confirmed as bug; fix not yet merged. Last activity 461 days ago.
Suggested action: keep open
Reason: The bug is still present in current code: line 478 of snap_yaml.py does `sorted(project.assumes + list(assumes))` which concatenates the user-provided list with the computed set, producing duplicates when the user already lists 'command-chain'. A maintainer confirmed the bug and provided a workaround, but no fix has been merged. The fix is trivial (use set union instead of list concatenation) and the issue remains reproducible.
Impact:
45
Quick Win:
40.5
Staleness:
65
Complexity:
10
Confidence:
80
Support Request:
5
Issue body
### Bug Description
When the snap is built with the following section:
```yaml
assumes:
- command-chain
```
The snap cannot be uploaded to snap store with the following error:
```
$ review-tools.snap-review -v tempest_39.0.0_amd64.snap
Errors
------
- lint-snap-v2:snap_schema
Error found while validating snap.json::$.assumes: ['command-chain', 'command-chain'] has non-unique elements
```
### To Reproduce
The bug can be reproduce using the tempest snap as an example: https://github.com/canonical/snap-tempest/blob/main/snap/snapcraft.yaml
I believe other snap with
```yaml
assumes:
- command-chain
```
will also fail to upload
### Environment
using `snapcraft 8.3.1 12136 latest/stable/… canonical✓ classic`
### snapcraft.yaml
```shell
See "To Reproduce" section
```
### Relevant log output
```shell
Errors
------
- lint-snap-v2:snap_schema
Error found while validating snap.json::$.assumes: ['command-chain', 'command-chain'] has non-unique elements
```
### Additional context
An inspection of `/snap/tempest/current/meta/snap.yaml` showed that somehow `assumes` contains a duplicated `command-chain`
```
cat /snap/tempest/current/meta/snap.yaml
```
```yaml
name: tempest
version: 39.0.0
summary: OpenStack Integration Test Suite
description: |
Tempest is a set of integration tests to be run against a live
OpenStack cluster. Tempest has batteries of tests for OpenStack
API validation, Scenarios, and other specific tests useful in
validating an OpenStack deployment.
license: Apache-2.0
architectures:
- amd64
base: core22
assumes:
- command-chain
- command-chain
apps:
tempest:
command: bin/tempest
completer: usr/share/bash-completion/completions/tempest
plugs:
- network-observe
- network
- home
environment:
TESTS: $SNAP_DATA/tempest_test_lists
command-chain:
- bin/tempest-wrapper
discover:
command: bin/discover-tempest-config
plugs:
- home
- network
environment:
SSL_CERT_FILE: $OS_CACERT
confinement: strict
grade: stable
environment:
LD_LIBRARY_PATH: ${SNAP_LIBRARY_PATH}${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}:$SNAP/lib
PATH: $SNAP/usr/sbin:$SNAP/usr/bin:$SNAP/sbin:$SNAP/bin:$PATH
```
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| qwen/qwen3.8-27b |
Impact:
45
Quick Win:
40.5
Staleness:
65
Complexity:
10
Confidence:
80
Support Request:
5
|
keep open | Snapcraft duplicates 'command-chain' in assumes when user already lists it, causing snap store upload to fail schema validation. Triaged and confirmed as bug; fix not yet merged. Last activity 461 days ago. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
45
Complexity:
30
Confidence:
85
Support Request:
10
|
keep open | Bug: Snapcraft duplicates 'command-chain' in assumes field during build, causing upload validation failure. Triaged, valid, awaiting fix or timeline. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
75
Complexity:
15
Confidence:
90
Support Request:
5
|
keep open | Snapcraft duplicates command-chain in the assumes field during build, causing snap store upload validation to fail. Issue is triaged, acknowledged by maintainers, and has an internal ticket, but remains unfixed. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
65
Complexity:
15
Confidence:
90
Support Request:
0
|
keep open | Snapcraft duplicates command-chain in assumes, causing snap store upload failures. Triaged with an internal ticket created. Awaiting development fix. Workaround: remove assumes: command-chain from snapcraft.yaml. |
Update history
No update history recorded yet.
Related work
-
Caused By:
canonical/snapcraft#4152
(confidence 75%)
Commit 36dca729e 'meta: include project provided assumes in snapd.yaml' introduced the `project.assumes + list(assumes)` concatenation that causes duplicates when the user already specifies command-chain.
Related issues
| Issue | Project | State | Summary | Similarity |
|---|---|---|---|---|
| #2796 meta: ensure Snap's `assumes` is initialized as a set | snapcraft | merged | Merged fix for SNAPCRAFT-16C that converts the assumes configuration from a list to a set during initialization. This resolves a runtime exception when using command-chain by ensuring the add method functions correctly. Includes updated unit tests. |