SZEDER Gábor <szeder.dev@xxxxxxxxx> writes: > On Mon, Sep 24, 2018 at 02:15:30PM -0700, Derrick Stolee via GitGitGadget wrote: >> From: Derrick Stolee <dstolee@xxxxxxxxxxxxx> >> >> The index v4 format has been available since 2012 with 9d22778 >> "reach-cache.c: write prefix-compressed names in the index". Since >> the format has been stable for so long, almost all versions of Git >> in use today understand version 4, removing one barrier to upgrade >> -- that someone may want to downgrade and needs a working repo. > > What about alternative implementations, like JGit, libgit2, etc.? Good question. Because the index-version of an index file is designed to be sticky, repos that need to be accessed by other implementations can keep whatever current version. A new repo that need to be accessed by them can be (forcibly) written in v2 and keep its v2ness, I would think. And that would serve as an incentive for the implementations to catch up ;-)
