Leo Famulari (2016-02-21 07:35 +0300) wrote: > On Thu, Jan 21, 2016 at 10:05:36PM +0100, Ludovic Courtès wrote: [...] >> I prefer 7! This is how Git usually truncates SHA1s, so it can’t be wrong. > > I stumbled across this email earlier, which reminded me of this > discussion about hash lengths: > https://lkml.org/lkml/2010/10/28/287 > > There are currently 13 7-character hash collisions in Guix's git repo: > > $ git rev-list --objects --all | cut -c1-7 | sort | uniq -dc > 2 0d2b24c > 2 11e0632 > 2 1f3ab8d > 2 229bd6c > 2 7c4a7b7 > 2 9ff8b63 > 2 aa27b56 > 2 c10c562 > 2 d96cdce > 2 dab4329 > 2 dc27d1c > 2 ea119a2 > 2 f56cc27
Hm, when I tried "git rev-list --objects --all" I got some ridiculous number of lines (I pressed C-c C-c after about 78000 lines). Does this command really do what you wanted? (I'm sorry I didn't RTFM well enough to understand what it does). I'm not sure if the following command is correct to find such collisions, but it gives nothing (i.e., no collisions): git log --oneline | cut -c1-7 | sort | uniq -dc -- Alex
