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A comment on Show HN: This page exists only if someone is looking at it. Parent comment

Re:Show HN: This page exists only if someone is looking at it by fragmede on Tuesday May 12, 2015 @01:16PM (#9533280)
> Git commits can only point to commits in the past and not future commits.

Not true! With git time-travel, you can refer to a future commits in the commit message. Eg:

    $ git log --oneline HEAD~2..HEAD
    9428c8c I am the child
    cdd3ab5 I am the parent of 9428c8
https://github.com/hundt/git-time-travel

:p

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Re:Show HN: This page exists only if someone is looking at it by fordh on Tuesday May 12, 2015 @07:41PM (#9535756)
Ha, that's a clever little tool!

For anyone curious, this uses the same idea as the "guess-and-check" approach spullara mentioned: https://news.ycombinator.com/item?id=953569

It changes the content of the commit (by iterating the hash in the commit message itself) until the hash of the child commit matches. A big part of the trick is that it only looks at a prefix of the hash, so the search space is much smaller than the full SHA1 hash.

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