error while copying shared lib to another folder

[shweta]

Hi I am new to snapcraft. I want to copy shared lib files to stage folder in one part.I can use these files in second part to cmake c++ code.

In first part while copying shared libs it shows error...no such file or directory...but the files are already present. I have tried both of things file with symlink and without symlink.....Please help if I am doing something wrong or I should chnage follow_symlink to True.

Preparing to pull files-copy
Pulling files-copy
'image-reading2' has prerequisites that need to be staged: files-copy
Preparing to build files-copy
Building files-copy
Traceback (most recent call last):
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/file_utils.py", line 119, in link_or_copy
    os.link(source_path, destination, follow_symlinks=False)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/lib/libopencv_core.so.3.2' -> '/root/build_image-reading2/parts/files-copy/install/libopencv_core.so.3.2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/snap/snapcraft/1345/bin/snapcraft", line 11, in <module>
    load_entry_point('snapcraft==2.40.1', 'console_scripts', 'snapcraft')()
  File "/snap/snapcraft/1345/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 565, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/snap/snapcraft/1345/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2631, in load_entry_point
    return ep.load()
  File "/snap/snapcraft/1345/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2291, in load
    return self.resolve()
  File "/snap/snapcraft/1345/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2297, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/cli/__main__.py", line 43, in <module>
    run(prog_name='snapcraft')
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/cli/lifecycle.py", line 139, in snap
    project_options, directory=directory, output=output)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_packer.py", line 46, in snap
    execute('prime', project_options)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 80, in execute
    _Executor(config, project_options).run(step, part_names)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 191, in run
    self._run_step(step, part, part_names)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 225, in _run_step
    self.run(required_step, step_prereqs)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 191, in run
    self._run_step(step, part, part_names)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/lifecycle/_runner.py", line 236, in _run_step
    getattr(part, step)()
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/internal/pluginhandler/__init__.py", line 368, in build
    self.plugin.build()
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/plugins/copy.py", line 103, in build
    _recursively_link(src, dst, self.installdir)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/plugins/copy.py", line 139, in _recursively_link
    _link_or_copy(source, destination, boundary)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/plugins/copy.py", line 124, in _link_or_copy
    follow_symlinks=follow_symlinks)
  File "/snap/snapcraft/1345/lib/python3.6/site-packages/snapcraft/file_utils.py", line 126, in link_or_copy
    shutil.copy2(source, destination, follow_symlinks=follow_symlinks)
  File "/snap/snapcraft/1345/usr/lib/python3.6/shutil.py", line 251, in copy2
    copyfile(src, dst, follow_symlinks=follow_symlinks)
  File "/snap/snapcraft/1345/usr/lib/python3.6/shutil.py", line 114, in copyfile
    with open(src, 'rb') as fsrc:
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/lib/libopencv_core.so.3.2'
Stopping local:snapcraft-superexpressively-untestifying-noel

[Kyle Fazzari (kyrofa)]

This snapcraft.yaml is very dependent on your host system, which isn't really how snapcraft was designed to be used. It's impossible for us to know exactly what's happening as a result. You should get rid of that first part, and stage those packages directly instead, something like this:

# ...
parts:
  image-reading2:
    plugin: cmake
    source: src
    build-packages:
        - g++
    stage-packages:
        - libopencv-core3.2
        - libopencv-highgui3.2
        - libopencv-imgproc3.2
        - libopencv-imgcodecs3.2

That said, that still may not be what you want, since you probably want to ensure the -dev packages are installed as well (e.g. libopencv-highgui-dev in build-packages), but I won't assume too much.

[Kyle Fazzari (kyrofa)]

(What we can and will do, of course, is fix the fact that this is a traceback)

[Kyle Fazzari (kyrofa)]

Fix for the traceback is here: https://github.com/snapcore/snapcraft/pull/2123