stage-snaps don't work on docker

Metadata

Project: snapcraft (launchpad)
Number: #1885028
Type: issue
State: closed
Author: ~kyrofa
Labels: —
Created: 2020-06-24 10:34 PM UTC
Updated: 2026-07-24 04:50 PM UTC
Closed: 2026-07-24 04:50 PM UTC

Current evaluation

Closed as won't fix after legacy Docker support was retired: canonical/snapcraft#5063 removed the Dockerfile and directed container builds to snapcraft-rocks OCI images.

Resolution: closed stale

Reason: The closing maintainer marked the report won't fix because containerized builds had moved from Snapcraft's Dockerfile to snapcraft-rocks OCI images. Commit 24e70d6db in canonical/snapcraft#5063 removed the obsolete Dockerfile and documented that replacement.

Evaluated by: mr-cal-bot

No scores available.

Issue body

Take this part: parts: foo: plugin: nil stage-snaps: [go] It doesn't work in docker, failing with: # snapcraft The following snaps are required but not installed as snapcraft is running inside docker or podman container: core18. Please ensure the environment is properly setup before continuing. Ignore this message if the appropriate measures have already been taken Sorry, an error occurred in Snapcraft: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) If I look at the traceback, it looks like this: # cat /tmp/tmpkhsge2v6/trace.txt Traceback (most recent call last): File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen chunked=chunked) File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/connectionpool.py", line 354, in _make_request conn.request(method, url, **httplib_request_kw) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1254, in request self._send_request(method, url, body, headers, encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1300, in _send_request self.endheaders(body, encode_chunked=encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1249, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1036, in _send_output self.send(msg) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 974, in send self.connect() File "/snap/snapcraft/current/lib/python3.6/site-packages/requests_unixsocket/adapters.py", line 32, in connect sock.connect(socket_path) FileNotFoundError: [Errno 2] No such file or directory During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/snap/snapcraft/current/lib/python3.6/site-packages/requests/adapters.py", line 449, in send timeout=timeout File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/connectionpool.py", line 638, in urlopen _stacktrace=sys.exc_info()[2]) File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/util/retry.py", line 368, in increment raise six.reraise(type(error), error, _stacktrace) File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/packages/six.py", line 685, in reraise raise value.with_traceback(tb) File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen chunked=chunked) File "/snap/snapcraft/current/lib/python3.6/site-packages/urllib3/connectionpool.py", line 354, in _make_request conn.request(method, url, **httplib_request_kw) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1254, in request self._send_request(method, url, body, headers, encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1300, in _send_request self.endheaders(body, encode_chunked=encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1249, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 1036, in _send_output self.send(msg) File "/snap/snapcraft/current/usr/lib/python3.6/http/client.py", line 974, in send self.connect() File "/snap/snapcraft/current/lib/python3.6/site-packages/requests_unixsocket/adapters.py", line 32, in connect sock.connect(socket_path) urllib3.exceptions.ProtocolError: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/snap/snapcraft/current/bin/snapcraft", line 11, in <module> load_entry_point('snapcraft==3.9.1', 'console_scripts', 'snapcraft')() File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 829, in __call__ return self.main(*args, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 782, in main rv = self.invoke(ctx) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 1236, in invoke return Command.invoke(self, ctx) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 610, in invoke return callback(*args, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/decorators.py", line 21, in new_func return f(get_current_context(), *args, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/cli/_runner.py", line 104, in run snap_command.invoke(ctx) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/cli/_command.py", line 88, in invoke return super().invoke(ctx) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File "/snap/snapcraft/current/lib/python3.6/site-packages/click/core.py", line 610, in invoke return callback(*args, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/cli/lifecycle.py", line 280, in snap _execute(steps.PRIME, parts=[], pack_project=True, output=output, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/cli/lifecycle.py", line 78, in _execute lifecycle.execute(step, project_config, parts) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 131, in execute executor.run(step, part_names) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 185, in run self._handle_step(part_names, part, step, current_step, cli_config) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 199, in _handle_step getattr(self, "_run_{}".format(current_step.name))(part) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 241, in _run_pull self._run_step(step=steps.PULL, part=part, progress="Pulling") File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 315, in _run_step self._prepare_step(step=step, part=part) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 307, in _prepare_step preparation_function() File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/pluginhandler/__init__.py", line 450, in prepare_pull self._fetch_stage_snaps() File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/pluginhandler/__init__.py", line 412, in _fetch_stage_snaps snaps_list=stage_snaps, directory=self.plugin.snapsdir File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/repo/snaps.py", line 278, in download_snaps if not snap_pkg.is_valid(): File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/repo/snaps.py", line 168, in is_valid if not self.in_store: File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/repo/snaps.py", line 91, in in_store self._is_in_store = self.get_store_snap_info() is not None File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/repo/snaps.py", line 114, in get_store_snap_info self._store_snap_info = _get_store_snap_info(self.name) File "/snap/snapcraft/current/lib/python3.6/site-packages/snapcraft/internal/repo/snaps.py", line 390, in _get_store_snap_info snap_info = requests_unixsocket.get(url) File "/snap/snapcraft/current/lib/python3.6/site-packages/requests_unixsocket/__init__.py", line 51, in get return request('get', url, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/requests_unixsocket/__init__.py", line 46, in request return session.request(method=method, url=url, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/requests/sessions.py", line 524, in request resp = self.send(prep, **send_kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/requests/sessions.py", line 637, in send r = adapter.send(request, **kwargs) File "/snap/snapcraft/current/lib/python3.6/site-packages/requests/adapters.py", line 498, in send raise ConnectionError(err, request=request) requests.exceptions.ConnectionError: ('Connection aborted.', FileNotFoundError(2, 'No such file or directory')) It makes sense why build-snaps aren't supported in docker, but I feel like stage-snaps should work.

Evaluation history

Date	Model	Scores	Action	Summary
2026-10-03 12:28 PM UTC	stealth/space-bunny-alpha	—	closed stale	Closed as won't fix after legacy Docker support was retired: canonical/snapcraft#5063 removed the Dockerfile and directed container builds to snapcraft-rocks OCI images.
2026-09-30 10:54 PM UTC	stealth/space-bunny-alpha	—	closed stale	Closed as won’t fix after legacy Docker builds were replaced by snapcraft-rocks OCI images; Dockerfile support was removed in canonical/snapcraft#5063 (24e70d6db).
2026-09-25 08:11 AM UTC	stealth/space-bunny-alpha	—	closed stale	No verified fixing PR or commit is available; the outcome of the Snapcraft stage-snaps Docker issue cannot be confirmed.
2026-07-26 03:19 AM UTC	qwen3.6-35b-a3b-mtp-q6	—	—	Closed without resolution. The reported Unix socket connection failure preventing stage-snaps from working in Docker remains unfixed.
2026-07-23 11:43 AM UTC	qwen/qwen3.6-35b-a3b	Staleness: 98 Complexity: 45 Confidence: 75 Support Request: 10	close stale	stage-snaps fail in Docker due to snapd Unix socket errors. Issue is 6 years old, has no maintainer response, and lacks labels.
2026-07-22 01:25 PM UTC	qwen/qwen3.6-35b-a3b	Staleness: 95 Complexity: 60 Confidence: 85 Support Request: 10	close stale	Report of stage-snaps failing in Docker due to a missing Unix socket connection when fetching snap metadata. Unaddressed for over 6 years with no maintainer interaction.
2026-07-09 03:38 PM UTC	qwen3.6-35b-a3b-mtp-q6	Staleness: 95 Complexity: 45 Confidence: 90 Support Request: 25	close stale	Snapcraft crashes when using stage-snaps in Docker due to an unmounted snapd socket. The issue has been inactive for over 4.5 years with no maintainer labels or responses.

Update history

Date	Change
2026-07-24 04:50 PM UTC	created

Related work

Superseded By: canonical/snapcraft#5063 (confidence 98%)
Removed the legacy Dockerfile and documented snapcraft-rocks OCI images, matching the closing rationale.
Related To: snapcraft-rocks#110 (confidence 85%)
Confirms snapd is unavailable in the OCI build environment and that build snaps require manual staging.

Related issues

Issue	Project	State	Summary	Similarity
#1901733 stage-snaps not usable with branches	snapcraft (launchpad)	closed	Stage/build-snap branch channels were identified as blocked by Snapcraft validation, but no fix landed; the item was eventually abandoned and closed as stale.	72%
#1826611 Running snapcraft 3 w/ core18 base in docker incorrectly reports missing lib deps	snapcraft (launchpad)	closed	Closed as stale after 2,716 days; Snapcraft's legacy Dockerfiles had been updated, then OCI builds moved to Rocks. No resolving fix was identified.	70%