Snapcraft build fails

snapcraft
1

Trying to build an example snap and it fails the build. Just learning how snapcraft works, but this simple examples fails each time and I cannot identify what is going wrong. Any help would be appreciated.

CAPTURED DATA:

$ sudo snap install --classic snapcraft

Ubuntu Version: Ubuntu 16.04.5 LTS

$ python -V
Python 2.7.12

$ snapcraft --version
snapcraft, version 2.43.1

$ dpkg -l | grep build-esse
ii  build-essential                                             12.1ubuntu2                                  amd64        Informational list of build-essential packages

dumpinfo$ tree
.
├── dumpinfo
│   ├── dumpinfo.py
│   └── __init__.py
├── README
├── requirements.txt
├── setup.py
└── snap
    └── snapcraft.yaml

2 directories, 6 files

setup.py
=============================================
from setuptools import setup

setup(
   name='dumpinfo',
   version='1.0',
   description='Test Dump tool',
   author='John Doe',
   author_email='jdoe@foo.com',
   packages=['dumpinfo'],  #same as name
   install_requires=[], 
)

requirements.txt 
=============================================
simplejson

snapcraft.yaml
snapcraft.yaml 
name: dumpinfo
version: '0.1' 
summary: DumpInfo program
description: |
  This is a test program for creating a snap.

grade: devel 
confinement: devmode

parts:
  dumpinfo:
    plugin: python
    python-version: python2
    source: . 

apps:
  dumpinfo:
    command: bin/dumpinfo.py

dumpinfo.py
=============================================
#!/usr/bin/python
import json

test = { "fname":"John","lname":"Doe","age":42}
print json.dumps(test)

Error:
$ snapcraft
<Cut all the stuff that  went right>
.
.
.
.
Staging dumpinfo 
Priming dumpinfo 
Sorry, an error occurred in Snapcraft:
Traceback (most recent call last):
  File "/usr/bin/snapcraft", line 9, in <module>
    load_entry_point('snapcraft==2.43.1', 'console_scripts', 'snapcraft')()
  File "/usr/lib/python3/dist-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1037, in invoke
    return Command.invoke(self, ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/_runner.py", line 93, in run
    ctx.forward(lifecyclecli.commands["snap"])
  File "/usr/lib/python3/dist-packages/click/core.py", line 552, in forward
    return self.invoke(cmd, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 136, in snap
    project = _execute(steps.PRIME, parts=[], **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 35, in _execute
    lifecycle.execute(step, project_config, parts)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 90, in execute
    executor.run(step, part_names)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 196, in run
    self._create_meta(step, processed_part_names)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 359, in _create_meta
    self.config.validator.schema,
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 109, in create_snap_packaging
    packaging.write_snap_yaml()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 312, in write_snap_yaml
    snap_yaml = self._compose_snap_yaml()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 468, in _compose_snap_yaml
    snap_yaml["apps"] = self._wrap_apps(self._config_data["apps"])
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 567, in _wrap_apps
    self._wrap_app(app, apps[app])
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 575, in _wrap_app
    app[k] = self._wrap_exe(app[k], "{}-{}".format(k, name))
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 546, in _wrap_exe
    with open(exepath, "rb") as exefile:
FileNotFoundError: [Errno 2] No such file or directory: '/home/myuser/Development/Python/dumpinfo/prime/bin/dumpinfo.py'
We would appreciate it if you created a bug report at
https://launchpad.net/snapcraft/+filebug with the above text included.

Executing
dumpinfo$ ls prime/bin/

Returns nothing

2

Can you please paste your snapcraft.yaml with the formatting? You can use markup language to paste it so that we know that the snapcraft.yaml format is correct.

I am assuming it looks like this:

snapcraft.yaml

version: ‘0.1’
summary: DumpInfo program
description: |
This is a test program for creating a snap.

grade: devel
confinement: devmode

parts:
  dumpinfo:
    plugin: python
    python-version: python2
    source: .

apps:
  dumpinfo:
    command: bin/dumpinfo.py

Thanks,
Luke

3

You nailed it except the line under description “This is a test program for creating a snap.” is indented a bit.

4

I see no entry points or scripts defined in that setup.py, which means bin/dumpinfo.py probably doesn’t exist. But you’ve defined an app that uses it, which is confusing snapcraft.

5

What would that look like? My setup.py file looks as such right now:
from setuptools import setup

setup(
name=‘dumpinfo’,
version=‘1.0’,
description=‘Test Dump tool’,
author=‘John Doe’,
author_email=‘jdoe@foo.com’,
packages=[‘dumpinfo’], #same as name
install_requires=[‘simple_json’],
scripts=[‘dumpinfo.py’]
)

Also, seemed to have gotten around original build issue, but getting the following:
Processing /home/tepkes/Development/Python/dumpinfo/parts/setup/src
Link is a directory, ignoring download_dir
Complete output from command python setup.py egg_info:
running egg_info
creating pip-egg-info/dumpinfo.egg-info
writing pip-egg-info/dumpinfo.egg-info/PKG-INFO
writing top-level names to pip-egg-info/dumpinfo.egg-info/top_level.txt
writing dependency_links to pip-egg-info/dumpinfo.egg-info/dependency_links.txt
writing manifest file ‘pip-egg-info/dumpinfo.egg-info/SOURCES.txt’
error: package directory ‘dumpinfo’ does not exist

----------------------------------------

Command “python setup.py egg_info” failed with error code 1 in /tmp/pip-req-build-iaIpjs/
Failed to run ‘/home/tepkes/Development/Python/dumpinfo/parts/setup/install/usr/bin/python2 -m pip download --disable-pip-version-check --dest /home/tepkes/Development/Python/dumpinfo/parts/setup/python-packages simple_json .’: Exited with code 1.

Which could be part of my setup.py problem. Any help here would be greatly appreciated. Thanks

6

You’ve just got good old python issues, now. Have you tried just getting this working in a virtual environment before trying to snap it? Get that working, and the snap will work as well. I’d be happy to help with that if you create a github repo with the project as it stands now, then I can clone it and tell you what the issues are.

7

I actually got it to build, I found the issue in the setup file, I had a setup.py outside of the src dir that it was latching on to. So now it builds, but I get the following:
$ snap list
Name Version Rev Tracking Publisher Notes
core 16-2.36.2 6034 stable canonical✓ core
dumpinfo 0.1 x1 - - devmode
snapcraft 3.0.1 2374 stable canonical✓ classic

$ ls /snap/bin
dumpinfo snapcraft
$ dumpinfo
/snap/dumpinfo/x1/command-dumpinfo.wrapper: 5: exec: /snap/dumpinfo/x1/bin/dumpinfo.py: not found

$ ls /snap/dumpinfo/x1/bin/dumpinfo.py
/snap/dumpinfo/x1/bin/dumpinfo.py <— so it exists

$ /snap/dumpinfo/x1/bin/dumpinfo.py
{“lname”: “Doe”, “age”: 42, “fname”: “John”} <— executing this gives me the right output

8

So in the tree, dumpinfo.py is in the dumpinfo/ directory. From what I gather havok4u is trying to use the python plugin to install the dumpinfo.py to bin/.

9

Yes. The python plugin isn’t magic though-- a proper setup.py is needed to make that happen.

10

Make sure dumpinfo.py is executable.

11

It is as I can execute it by doing the following command: /snap/dumpinfo/x1/bin/dumpinfo.py d

Also here is my tree:

Development/Python/dumpinfo$ tree
.
├── snap
│ └── snapcraft.yaml
└── src
├── dumpinfo.py
├── init.py
├── README
├── requirements.txt
└── setup.py

2 directories, 6 files

12

what is the shebang line stating on your dumpinfo.py file?

If it has an absolute path to python then it won’t work without modifying (e.g. #!/usr/bin/python3). The normal way to fix that is to change it to something like:

#!env python3
13

Changed to #!env python2
and it didn’t work, but changed to
#!/usr/bin/env python2
and it works now. Thanks

1 Like