A fork of bradfitz's git-brute with some refactoring and performance improvements for multiple CPUs.
gitbrute brute-forces a pair of author+committer timestamps such that the resulting git commit has your desired prefix.
It will find the most recent time that satisfies your prefix.
Shorter prefixes match more quickly, of course. The author & committer timestamp are not kept in sync.
Example: https://github.com/bradfitz/deadbeef
Usage:
gitbrute -prefix=000000
This amends the last commit of the current repository.
-dryrunand-vverbose flags.- set a default prefix via
$GITBRUTE_PREFIX. - refactored code for profiling and benchmarking.
- modernized for ease of maintenance to use some standard library additions.
- improved mechanism for parallel trial exploration, increases performance significantly on multiple CPU cores.*
🪦 The original gitbrute "is kinda a joke and I don't want to maintain it", so I am maintaining this as my own fork for personal use rather than working on pull requests and giving someone else more maintenance chores.
On my personal laptop (MacBook M2 Pro), I get a roughly ~15x throughput increase as a result of the various optimizations:
| bradfitz/gitbrute | mroth/gitbrute |
|---|---|
| 3.1M op/sec | 47.8M op/sec |
At this speed, 1-5 character prefixes are pretty much instant, and a 6 character prefix takes ~100-500ms.
If you really want to make your coworkers hate you, this can typically generate 7 character prefixes (the total length of a git short sha as displayed in most GitHub tooling) in ~15-30 seconds.