Bad checksum error on osh.0.1

[jmid]

osh.0.1 is failing to download cleanly, causing a bad checksum error:
https://opam.ci.ocaml.org/github/ocaml/opam-repository/commit/1543bda091d998b92bcf85fe4dd4ec84534a224d/variant/compilers,4.14,dune-build-info.3.20.0~alpha1,revdeps,osh.0.1

#=== ERROR while fetching sources for osh.0.1 =================================#
OpamSolution.Fetch_fail("https://gitlab.ocamlpro.com/OCamlPro/osh/-/archive/0.1/osh-0.1.tar.bz2 (Bad checksum, expected sha256=c5c6509d36e50715bb0bb90d54375a2fc618a7010c8c79c4663d8ffd5b5fde22)")

(spotted on #28276 and the earlier #28267)

It turns out that wget https://gitlab.ocamlpro.com/OCamlPro/osh/-/archive/0.1/osh-0.1.tar.bz2 fetches an HTML page, asking to login to https://gitlab.ocamlpro.com: "You need to sign in or sign up before continuing."

To fix this

• one option is to look for the package in one of the caches and add it to the opam-sources archive
• another option is to hear if it is possible to roll back the login requirement, as this will continue to be an issue, e.g., for future osh releases

@zapashcanon as the author, what do you think and prefer?

[jmid]

It seems opam-custom-install.0.1 and 0.2 are failing with a bad checksum for the same reason.
The repo and source url however moved to GitHub for the 0.3 release: https://github.com/OCamlPro/opam-custom-install
The new one does not have release tags for 0.1 or 0.2 though...

[jmid]

I've now dug out the missing sources and created a PR with them at ocaml/opam-source-archives#49

[jmid]

Closing this as #28332 has been merged.