Could not build Tezos node which depends on ocaml-migrate-parsetree

[dimaa6]

[ERROR] The sources of the following couldn't be obtained, aborting:
- ocaml-migrate-parsetree.1.4.0: Bad checksum

[rmn30]

I also have this error. Looking at the metadata for release 1.4.0 in the opam-repository it looks like the release is from July 2019 but the v1.4.0 tag was made very recently by @diml . Maybe the tag was moved by mistake?

As a workaround I was able to install 1.3.1 using:

opam pin ocaml-migrate-parsetree 1.3.1

which was sufficient for me to install the package I wanted.

[lindig]

it is somewhat curious that a large number of packages in Opam seem to have broken checksums.

ocaml/opam-repository#15298

A typical reason is that a file hosted by GitHub is re-compressed, which changes the checksum. Many of the affected packages are not hosted on GitHub, though. The current issue here is different: the source code actually changed.

[P3tronius]

You can also force install 1.4.0 using opam install ocaml-migrate-parsetree --no-checksums and the resume tezos's make build-deps

[mseri]

Omp 1.4.0 has been fixed later yesterday (ocaml/opam-repository#15281). I recommend not to use —no-checkums, in this case the tarball was changed by mistake and you would have installed a different library version than expected. In general it is safer to revert to the previous version with correct checksum as suggested by @rmn30

So in the end what happened is that I messed up and accidentally replaced the 1.4.0 tarball in place on github (cf ocaml/opam-repository#15280 (comment)). The original tarball has now been restored on ocaml-ppx/ocaml-migrate-parsetree as well as the original checksum in the opam-repository. So all is good now.