Install from Scratch - Lemmy Documentation
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I’m trying this on Ubuntu 22.04 Rust’s cargo install seems to keep creating permission problems between what I have to install, compile and what gets published in the cargo “registry”, which causes issues at runtime when I run as lemmy:lemmy through systemctl.

If I run: cargo install lemmy_server --target-dir /usr/bin/ --locked --features embed-pictrs as a non-root user, I get permission denied issues with /usr/bin/.future-incompat-report.json and /usr/bin/release

If I run the build as a root user, and then manually copy the binaries to /usr/bin and chmod them to lemmy:lemmy, then try to run as lemmy:lemmy, it appears the binary is trying to access some “registry” files in /root/.cargo/registry (for which of course it does not have permissions.)

How do I fix this?

  • KIM_JONG_JUICEBOX@lemmy.mlOP
    3·
    1 year ago

    Thanks.

    So if I go on a mad chmod spree, making /usr/bin/lemmy_server and all of its dependencies readable/executable (which is super insecure) I finally get to this log message in journalctl:

    Jun 07 13:50:57 ip-172-31-4-153 lemmy_server[3868]: thread 'main' panicked at 'C
ouldn't run DB Migrations', /home/ubuntu/.cargo/registry/src/index.crates.io-6f1
7d22bba15001f/lemmy_db_schema-0.17.3/src/utils.rs:165:25

    Which is this code:

    pub fn run_migrations(db_url: &str) {
  // Needs to be a sync connection
  let mut conn =
    PgConnection::establish(db_url).unwrap_or_else(|_| panic!("Error connecting to {db_url}"));
  info!("Running Database migrations (This may take a long time)...");
  let _ = &mut conn
    .run_pending_migrations(MIGRATIONS)
    .unwrap_or_else(|_| panic!("Couldn't run DB Migrations"));
  info!("Database migrations complete.");
}

    Hope that helps someone figure this out.

    I’m pretty unhappy that I can’t get this to work.

      • KIM_JONG_JUICEBOX@lemmy.mlOP
        1·
        1 year ago

        So I am able to build from the git repo.

        Had to remove rust from apt (v 1.65)

        And install rust from rustup (v 1.70)

        That fixes the build, but now I still get this db migrations error on startup.

        Jun 09 15:47:37 ip-x systemd[1]: Started Lemmy - A link aggregator for the fediverse.
Jun 09 15:47:37 ip-x lemmy_server[15239]: 2023-06-09T15:47:37.238544Z  INFO lemmy_db_schema::utils: Running Database migrations (This may take a long time)...
Jun 09 15:47:37 ip-x lemmy_server[15239]: thread 'main' panicked at 'Couldn't run DB Migrations', crates/db_schema/src/utils.rs:165:25
Jun 09 15:47:37 ip-x lemmy_server[15239]: note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Jun 09 15:47:37 ip-x systemd[1]: lemmy.service: Main process exited, code=exited, status=101/n/a

        I know it can connect to the db because I see it created some tables already.

        I wonder if this is related to this warning regarding schema, which I see during the build.

        warning: /root/git-clones/lemmy/crates/api_common/Cargo.toml: `default-features` is ignored for lemmy_db_schema, since `default-features` was not specified for `workspace.dependencies.lemmy_db_schema`, this could become a hard error in the future
        • RoundSparrow@lemmy.ml
          3·
          1 year ago

          > thread ‘main’ panicked at ‘Couldn’t run DB Migrations’, crates/db_schema/src/utils.rs:165:25

          I fixed this by issuing:

          sudo -iu postgres psql -c “ALTER USER lemmy WITH SUPERUSER;”

          Obviously this has database security implications, but at least it identified that was why DB Migrations is failing.

          EDIT: I found the developers of Lemmy seem to have identified the cause for this, it’s just a couple SQL statements: https://github.com/LemmyNet/lemmy/pull/2983/commits/29c4144e61e97e895fb7eb37d2c257c8520fd6a6

          EDIT 2: The developers are currently treating this as a documentation bug: https://github.com/LemmyNet/lemmy-docs/issues/201

          • KIM_JONG_JUICEBOX@lemmy.mlOP
            2·
            1 year ago

            Thank you!

            So the git based build instructions from @[email protected] works.

            What was missing for me was then the rust version and the full list of sql commands.

            1. Rust version

Remove rust installed from Ubuntu apt repo (v 1.65)
Install rust from rustup (v 1.70)

2. Postgres commands

sudo -iu postgres psql -c "CREATE USER lemmy WITH PASSWORD 'db-passwd';"
sudo -iu postgres psql -c "CREATE DATABASE lemmy WITH OWNER lemmy;"
sudo -iu postgres psql -c "ALTER USER lemmy WITH SUPERUSER;"
            • RoundSparrow@lemmy.ml
              2·
              1 year ago

              The lemmy-ui steps, the next part - are pretty outdated. It has instructions to install NodeJS 12.x, which is really far back. I have no idea which version the Docker install is using…

              The latest version of Node is 20

              • KIM_JONG_JUICEBOX@lemmy.mlOP
                2·
                1 year ago

                Before I even get there, the instructions say I should be able to run

                curl localhost:8536/api/{version}/site

                And it should return some json structure.

                But I see this returning 404

                lemmy_server[41511]: 2023-06-09T17:02:35.296098Z  INFO actix_web::middleware::logger: 127.0.0.1 "GET /api/0.17.3/site HTTP/1.1" 404 0 "-" "curl/7.81.0" 0.000074

                Is that the correct way to specify the version?

                Is there a better log than journalctl which would actually tell me what REST endpoints it is using?

                • RoundSparrow@lemmy.ml
                  2·
                  1 year ago

                  Is that the correct was to specify the version?

                  No, I had to dig around too, the correct command is:

                  curl localhost:8536/api/v3/site

                  • KIM_JONG_JUICEBOX@lemmy.mlOP
                    1·
                    1 year ago

                    Thank you, again!

                    How was I to know {version} in the REST endpoint path was supposed to be “v3”?

                    Any luck with the lemmy-ui install?