pub install: could the no-op case be faster?

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="96" height="96"hspace="10"> Issue by kevmoo
Originally opened as dart-lang/sdk#16494

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~> time pub install
Resolving dependencies...
Got dependencies!

real 0m0.620s
user 0m0.557s
sys 0m0.060s

I could imagine this being useful in more places...or run often/always from other tools (hop) to make sure everything is up-to-date.

BUT! half a second is likely a bit too much overhead.

Is there room here to optimize? Just curious...

Flagging as enhancement, because I think for the common case now, it's plenty fast.

[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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The majority of that time is probably removing and recreating the "packages" directory with the symlinks in it. I'm just going to close this out as a dupe of that and hopefully it will get faster when we can get rid of symlinks.

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Added Duplicate label.
Marked as being merged into #727.