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Speed up "git fat checkout" and "git fat pull" #68

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Speed up "git fat checkout" and "git fat pull" #68

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Commits on Jul 13, 2015

  1. Refactor the "git fat checkout" operation (and therefore also "git fa… 

    …t pull") to significantly improve its speed.

The main change here is that git checkout-index is now called only a single time for all files.
In some tests the performance improvement is six-fold.

With this change it doesn't make sense anymore to print out each file as it is being processed,
so only the number of files that need to be restored is shown.
The actual filenames are only printed if git-fat is verbose.
    @purdeaandrei
    purdeaandrei committed Jul 13, 2015
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  2. git fat checkout / git fat pull: Print digest of restored filenames t… 

    …oo in verbose mode.
    @purdeaandrei
    purdeaandrei committed Jul 13, 2015
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  3. git fat checkout, git fat pull: use null-terminated filename strings … 

    …when talking to git.
    @purdeaandrei
    purdeaandrei committed Jul 13, 2015
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