git refs migrate --ref-format=reftable #768

git pull --rebase
remote: Enumerating objects: 196, done.
remote: Counting objects: 100% (183/183), done.
remote: Compressing objects: 100% (112/112), done.
remote: Total 196 (delta 83), reused 155 (delta 71), pack-reused 13 (from 1)
Receiving objects: 100% (196/196), 61.75 KiB | 1.82 MiB/s, done.
Resolving deltas: 100% (93/93), completed with 8 local objects.
error: You're on a case-insensitive filesystem, and the remote you are
trying to fetch from has references that only differ in casing. It
is impossible to store such references with the 'files' backend. You
can either accept this as-is, in which case you won't be able to
store all remote references on disk. Or you can alternatively
migrate your repository to use the 'reftable' backend with the
following command:

    git refs migrate --ref-format=reftable

Please keep in mind that not all implementations of Git support this
new format yet. So if you use tools other than Git to access this
repository it may not be an option to migrate to reftables.