Sample Blog build failure

[DivineGod]

I tried running the sample project in the repository with gleam run and got a terrible error.

I'm on Asahi Linux Fedora 42

I installed gleam from source and erlang from fedora dnf packages

Error log

$ cd blogatto/examples/simple_blog/
$ gleam run
  Resolving versions
Downloading packages
 Downloaded 33 packages in 0.81s
  Compiling gleam_stdlib
  Compiling filepath
  Compiling fs
===> Fetching pc v1.15.0
===> Analyzing applications...
===> Compiling pc
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.app' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc.app' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_compilation.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_compilation.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_env.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_port_env.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_specs.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_port_specs.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_clean.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_prv_clean.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_compile.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_prv_compile.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_util.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_util.beam' are the same file
===> sh(cp -Rp /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.app /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_compilation.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_env.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_specs.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_clean.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_compile.beam /home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_util.beam "/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin")
failed with return code 1 and the following output:
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.app' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc.app' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_compilation.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_compilation.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_env.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_port_env.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_port_specs.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_port_specs.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_clean.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_prv_clean.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_prv_compile.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_prv_compile.beam' are the same file
cp: '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/default/plugins/pc/ebin/pc_util.beam' and '/home/ando/dev/blogatto/examples/simple_blog/build/dev/erlang/fs/_build/prod/plugins/pc/ebin/pc_util.beam' are the same file

error: Shell command failure

There was a problem when running the shell command `rebar3`.

I also tried in an new gleam project by running

$ gleam new test_project
$ cd test_project
$ gleam add blogatto@3
$ gleam run

[veeso]

You need to install rebar3

[DivineGod]

yes, rebar3 is installed. it's what's generating the error

[DivineGod]

$ rebar3 version
rebar 3.26.0 on Erlang/OTP 26 Erts 14.2.5.13

$ gleam --version
gleam 1.15.0-rc1

$ erl --version
Erlang/OTP 26 [erts-14.2.5.13] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit]

Eshell V14.2.5.13 (press Ctrl+G to abort, type help(). for help)

[veeso]

I don't know, it must be something on your side though. I haven't tried on Gleam 1.15 rc since it's not stable yet, otherwise ask on the Discord channel.

[DivineGod]

Definitely something strange happening. gleam v1.14.0 (latest release at the time of writing) also fails

[schonfinkel]

@DivineGod @veeso I think I was able to accidentally reproduce this issue while adding a pure nix build to a blogatto-based project of mine. The root cause is that not only you need rebar3, but the following is happening:

• blogatto uses filespy, which has fs as a transitive dependency.
• fs builds a NIF and needs pc to do it.

In nix, the fix looks like this (in flake.nix):

        # ...
          packages = {
            default = inputs'.nix-gleam.packages.buildGleamApplication {
              src = ./.;
              rebar3Package = pkgs.rebar3WithPlugins {
                plugins = with pkgs.beamPackages; [ pc ];
              };
            };
          };
        # ...

the full flake.nix is available in the link I provided above, but the solution seems to be making sure rebar3 has pc as well.