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_loader/loader.py: Report element-path when failing to load elements

Chandan Singh requested to merge chandan/396-element-path-summary into master

Description

It can be confusing, especially to new BuildStream users, that the CLI expects targets to be specified relative to element-path and not the current directory. Previously, the CLI would give a generic message stating that the file could not be found but it was not obvious that it was looking in the element-path directory.

Explicitly print the element-path in the summary. Also, try to check if the specified element exists in the elements directory and print a hint to use the element-path relative paths if that's the case.

Fixes #396 (closed).

This is is also related to #341. This commit aims to tackle that issue by trying to educate users about element-path.

Changes proposed in this merge request:

  • _loader/loader.py: Report element-path in pipeline summary

This merge request, when approved, will close issue/bug: #396 (closed).

CHANGELOG/Release Notes

Edited by Chandan Singh

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