irmin: add lock files

[maiste]

To ensure users can create a switch without error, couldn't we add x.opam.locked files into the repository? Thanks to this, users could simply build a switch with:

 $ opam switch create . --deps-only --locked

The drawback is that when we release a new version, we must update these files.

[samoht]

Adding a lock file is a good idea but I would rather recommend users to do opam monorepo pull instead of an opam switch create in that case. The CI should be able to do this automatically.

[maiste]

As I'm not a user of opam monorepo: what is the difference between opam switch create and opam monorepo pull?

Also, in this case, should the lock files be created with opam monorepo lock?

[craigfe]

opam monorepo is a plugin to Opam that automates vendoring of Dune projects in a subdirectory in the project tree, so opam monorepo lock also runs a solver and writes a lock file containing the computed fixed versions, but that lock file also contains the development Git repositories so that the projects can be git clone-ed. Then opam monorepo pull fetches the dependencies locally so that dune build Just Works™ and there's no need to invoke opam to compile things.

AFAIK, the lock file produced by opam monorepo lock is fully-compatible with opam switch create (but the converse is not true).

[maiste]

Lock files won't be added to this repository. They will be available on tarides/tezos-storage-bench.

Edit: one lock file will be added here, but the lock files for benchmarking will be stored into the other repository.

[samoht]

It's still a good idea to have a lock file here for anyone who wants to compile the irmin binary easily.

[maiste]

The lock file doesn't seem to be necessary as it has been moved to https://github.com/tarides/irmin-scratch. Closing it. Feel free to reopen if needed.