pub: symlinks within the project confused it

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1081711?v=3" align="left" width="96" height="96"hspace="10"> Issue by jmesserly
Originally opened as dart-lang/sdk#9418

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I hit an interesting case where Pub's "packages" symlinks get confused. Consider this folder structure:

web_ui/
  example/
 
  test/data/input
    example -> ../../../example

In this case, you end up with a packages symlink like this:

web_ui
  example/
    packages -> ../../../../../../packages

Basically, the number of ".." gets doubled because it's taking into account the relative symlink in "test/data/input"

Probably, you need to normalize the directory path relative to the directory containing the pubspec, before computing the relative symlink path for "packages"

BTW: this is not high priority--I was already in the process of fixing web_ui to not require symlinks to itself for tests. So I can unblock us on the web_ui side.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Added this to the Later milestone.
Removed Priority-Medium label.
Added Priority-Low label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/264967?v=3" align="left" width="48" height="48"hspace="10"> Comment by amouravski

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Added Community-StarterBug label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Marked this as being blocked by #727.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Set owner to @munificent.
Added Started label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Added Fixed label.