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by avar 4459 days ago
Here's a patch I submitted purely for discussion to add a feature to Git to allow for vanity commit hashes back in 2011, it generated some interesting discussion: http://lists-archives.com/git/756392-choosing-the-sha1-prefi...

Unlike the linked it didn't alter the commit date, but altered the Git code itself to add a new custom header to the commit object.

Git handles custom headers just fine since it ignores unknown headers for future compatibility. This commit still lives in the main Git repo at work without any issues:

    commit 313375d995e6f8b7773c6ed1ee165e5a9e15690b
    tree c9bebc99c05dfe61cccf02ebdf442945c8ff8b3c
    parent 0dce2d45a79d26a593f0e12301cdfeb7eb23c17a
    author Ævar Arnfjörð Bjarmason <avar@booking.com> 1319042708 +0200
    committer Ævar Arnfjörð Bjarmason <avar@booking.com> 1319042708 +0200
    lulz 697889
1 comments
syncerr 4459 days ago
Testing it out:

  > git commit -F message
  Try 0/4000000 to get a 1337 commit = 3650e08c9e1ecbbeec83daf7a959e3edcf15bd4f
  Try 100000/4000000 to get a 1337 commit = 3952f7d5035f5e88f66aa5c70e5cc11fdd734852
  Try 200000/4000000 to get a 1337 commit = 51c910f5d535c515a04796eb7c7a70cbd2325599
  Try 300000/4000000 to get a 1337 commit = d70c3e64b1d963461a6ee2f518c613483b979d68
  ...
  commit id = 313378458f8c4fb53c808f4b0bae5bf71ba5e23b
  [master 3133784] 1337 Test Commit
   1 file changed, 60 insertions(+), 35 deletions(-)
https://github.com/spence/git/commit/313378458f8c4fb53c808f4...
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avar 4459 days ago
Right, and now you can use "git show --pretty=raw" to see the commit header:

    $ git show --pretty=raw 313378458f8c4fb53c808f4b0bae5bf71ba5e23b | head -n 10
    commit 313378458f8c4fb53c808f4b0bae5bf71ba5e23b
    tree 7e93df01bfc9c187d58a0b96e756dd8ac0031c82
    parent e4eef26d985177e4bdd32bf58b6ae40e7ae67289
    author Spencer Creasey <screasey@monetate.com> 1396872901 -0400
    committer Spencer Creasey <screasey@monetate.com> 1396872901 -0400
    lulz 843475
    
        1337 Test Commit
        
        http://lists-archives.com/git/756394-choosing-the-sha1-prefix-of-your-commits.html
There's replies in that thread where the naïve technique I was using was improved a lot.
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