Opam update fails with [ERROR] Could not update repository "default"

[kit-ty-kate]

Sorry about that. GNU patch has known issues, however there are solutions:

Opam repository archival, phase 3

And just a few minutes ago, we finally merged that PR. In case you’re in trouble (esp. on macOS I guess since there a gpatch is available which has file descriptor leaks), what you can do is get the latest opam 2.4.0 beta1 (from Release 2.4.0~beta1 · ocaml/opam · GitHub) which includes a patch written in OCaml without file descriptor leaks. Later there will be subsequent runs of the same utility, archiving more packages.

If running a beta version doesn’t suit you, you can instead do:

rm -rf ~/.opam/repo/default && opam update