Snapcraft tutorial errors out on OSX with multipass error, "returned exit code 2"
Metadata
Current evaluation
macOS Multipass bootstrap hits apt 404s and then mount failures, blocking the tutorial; the host-side CPU-affinity crash has a fallback, but the primary failure remains unconfirmed.
Suggested action: keep open
Reason: The report provides a concrete macOS/core18/Snapcraft 3.8 reproduction with apt 404s followed by a mount failure, and maintainer ~sergiusens explicitly said networking was not fully up and that Snapcraft would improve failure exposure and cleanup. Commit fc9799b26 added a fallback for the secondary os.sched_getaffinity crash, but there is no evidence that the underlying Multipass networking/bootstrap failure was fixed.
Evaluated by: mr-cal-bot
Impact:
55
Quick Win:
13
Complexity:
62
Confidence:
82
Actionability:
62
Issue body
Attempting to run through the Go tutorial on OSX results in the following when running `snapcraft` the first time:
```
Launching a VM.
Launched: snapcraft-test-httplab-dobs
2019-12-16T15:57:59Z INFO Waiting for restart...
snapd 2.42.5 from Canonical✓ installed
core18 20191126 from Canonical✓ installed
snapcraft 3.8 from Canonical✓ installed
Ign:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
Ign:2 http://archive.ubuntu.com/ubuntu bionic InRelease
Ign:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Err:4 http://security.ubuntu.com/ubuntu bionic-security Release
404 Not Found [IP: 91.189.91.14 80]
Ign:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Err:6 http://archive.ubuntu.com/ubuntu bionic Release
404 Not Found [IP: 91.189.88.24 80]
Err:7 http://archive.ubuntu.com/ubuntu bionic-updates Release
404 Not Found [IP: 91.189.88.24 80]
Err:8 http://archive.ubuntu.com/ubuntu bionic-backports Release
404 Not Found [IP: 91.189.88.24 80]
Reading package lists... Done
E: The repository 'http://security.ubuntu.com/ubuntu bionic-security Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu bionic-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://archive.ubuntu.com/ubuntu bionic-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Failed to update the package cache: Some files could not be downloaded:
failed to run apt update
Check that the sources on your host are configured correctly.
An error occurred when trying to execute 'sudo -i env SNAPCRAFT_HAS_TTY=True snapcraft refresh' with 'multipass': returned exit code 2.
```
On subsequent runs:
```
Launching a VM.
snap "snapd" has no updates available
snap "core18" has no updates available
snap "snapcraft" has no updates available
mount failed: Error enabling mount support in 'snapcraft-test-httplab-dobs'
An error occurred with the instance when trying to mount with 'multipass': returned exit code 2.
Ensure that 'multipass' is setup correctly and try again.
```
I've confirmed that multipass is running, though unclear how to confirm that it's set up "correctly."
Based on others' incidents I attempted to run `snapcraft clean`, the result was the following:
```
Sorry, an error occurred in Snapcraft:
module 'os' has no attribute 'sched_getaffinity'
Traceback (most recent call last):
File "/usr/local/bin/snapcraft", line 8, in <module>
sys.exit(run())
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/cli/_command.py", line 87, in invoke
return super().invoke(ctx)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/cli/lifecycle.py", line 338, in clean
lifecycle.clean(project, parts, steps.PRIME)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/internal/lifecycle/_clean.py", line 198, in clean
config = project_loader.load_config(project)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/internal/project_loader/__init__.py", line 47, in load_config
return Config(project)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/internal/project_loader/_config.py", line 212, in __init__
self.data = self._expand_env(snapcraft_yaml)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/internal/project_loader/_config.py", line 335, in _expand_env
snapcraft_global_environment(self.project)
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/internal/project_loader/_env.py", line 110, in snapcraft_global_environment
"SNAPCRAFT_PARALLEL_BUILD_COUNT": str(project.parallel_build_count),
File "/usr/local/Cellar/snapcraft/3.9/libexec/lib/python3.7/site-packages/snapcraft/project/_project_options.py", line 135, in parallel_build_count
return len(os.sched_getaffinity(0))
AttributeError: module 'os' has no attribute 'sched_getaffinity'
We would appreciate it if you created a bug report at
https://launchpad.net/snapcraft/+filebug with the above text included.
You can find the traceback in file '/var/folders/8t/bcy9yfg90c56_4m_36wmtyrm0000gp/T/tmp4o1p110g/trace.txt'.
```
Which led me here.
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| stealth/space-bunny-alpha |
Impact:
55
Quick Win:
13
Complexity:
62
Confidence:
82
Actionability:
62
|
keep open | macOS Multipass bootstrap hits apt 404s and then mount failures, blocking the tutorial; the host-side CPU-affinity crash has a fallback, but the primary failure remains unconfirmed. | |
| stealth/space-bunny-alpha |
Impact:
58
Quick Win:
18
Complexity:
52
Confidence:
79
Actionability:
64
|
keep open | macOS Multipass bootstrap hits apt 404s, followed by mount failures; Snapcraft clean also crashes on missing os.sched_getaffinity. Maintainer-acknowledged, but the primary failure is not confirmed resolved. | |
| qwen/qwen3.6-35b-a3b |
Impact:
30
Quick Win:
22
Complexity:
20
Confidence:
95
Actionability:
90
|
close resolved | Snapcraft crashes on macOS due to os.sched_getaffinity not being available. Fixed by PR #2963 which adds fallback logic. | |
| qwen/qwen3.8-27b |
Impact:
25
Quick Win:
16
Staleness:
95
Complexity:
35
Confidence:
70
Support Request:
45
|
close stale | Dec 2019 report: snapcraft 3.9 on macOS fails via multipass (apt 404s, mount exit code 2) and crashes with AttributeError on os.sched_getaffinity. No maintainer activity; that code path no longer exists in current snapcraft, and macOS support was dropped. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
98
Complexity:
25
Confidence:
92
Support Request:
65
|
close stale | Snapcraft tutorial fails on macOS due to multipass errors, EOL Ubuntu Bionic repos, and a Python 3.7 macOS compatibility issue. Issue is over 6 years old with no maintainer interaction. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
98
Complexity:
25
Confidence:
95
Support Request:
30
|
close stale | Snapcraft tutorial fails on macOS due to Multipass VM errors, outdated Ubuntu Bionic repositories, and Python 3.7 compatibility issues. No activity for over 6 years. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
98
Complexity:
15
Confidence:
95
Support Request:
30
|
close stale | Reported snapcraft and multipass failures on macOS with Ubuntu 18.04 (bionic) repositories and Python compatibility errors. Issue is over 6 years old with no maintainer response. |
Update history
| Date | Change |
|---|---|
| created |
Related work
-
Likely Fixed By:
snapcraft#2963
(confidence 95%)
Commit fc9799b26 adds a multiprocessing.cpu_count fallback when os.sched_getaffinity is unavailable, addressing the secondary snapcraft clean crash on macOS.
-
Related To:
snapcraft (launchpad)#1904774
(confidence 82%)
That Multipass setup failure was addressed by canonical/snapcraft#3381, commit 51e75b4de, which checks whether an instance exists before deleting it; it does not establish that this issue's apt networking failure is resolved.
Related issues
| Issue | Project | State | Summary | Similarity |
|---|---|---|---|---|
| #1806083 snapcraft fails to locate multipass (inside a multipass session) | snapcraft (launchpad) | open | Snapcraft 3.0.1 falsely reported Multipass missing inside a Multipass guest; Darwin-only detection in e9ae8d29f addressed the old path, but the Launchpad record remains open. | |
| #5145 snapcraft fails to launch multipass instance when multipass isn't pre-installed | snapcraft | open | Snapcraft emits cryptic 'Remote "snapcraft" is unknown or unreachable / exit code 2' when Multipass can't launch the build instance; maintainer traced it to image-server unavailability or non-amd64 hosts, fix tracked in craft-providers#211 |