Doesn't work on nixos

[codygman]

Specifically I get:

error in process sentinel: Could not start nREPL server: java.io.IOException: Permission denied. Please check your access rights for /nix/store/ay75a41p8z50654qq9afaakmbj9wwpxi-emacs-packages-deps/share/emacs/site-lisp/elpa/ejc-sql-20200607.2010

That's not suprising since the Nix store is readonly.

Full traceback

``` error in process sentinel: Could not start nREPL server: java.io.IOException: Permission denied. Please check your access rights for /nix/store/ay75a41p8z50654qq9afaakmbj9wwpxi-emacs-packages-deps/share/emacs/site-lisp/elpa/ejc-sql-20200607.2010/.nrepl-port at leiningen.repl$repl.invokeStatic (repl.clj:385) leiningen.repl$repl.doInvoke (repl.clj:316) clojure.lang.RestFn.applyTo (RestFn.java:142) clojure.lang.Var.applyTo (Var.java:705) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$partial_task$fn__6592.doInvoke (main.clj:284) clojure.lang.RestFn.applyTo (RestFn.java:139) clojure.lang.AFunction$1.doInvoke (AFunction.java:31) clojure.lang.RestFn.applyTo (RestFn.java:137) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$apply_task.invokeStatic (main.clj:334) leiningen.core.main$apply_task.invoke (main.clj:320) leiningen.core.main$resolve_and_apply.invokeStatic (main.clj:343) leiningen.core.main$resolve_and_apply.invoke (main.clj:336) leiningen.update_in$update_in.invokeStatic (update_in.clj:37) leiningen.update_in$update_in.doInvoke (update_in.clj:24) clojure.lang.RestFn.applyTo (RestFn.java:146) clojure.lang.Var.applyTo (Var.java:705) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$partial_task$fn__6592.doInvoke (main.clj:284) clojure.lang.RestFn.applyTo (RestFn.java:139) clojure.lang.AFunction$1.doInvoke (AFunction.java:31) clojure.lang.RestFn.applyTo (RestFn.java:137) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$apply_task.invokeStatic (main.clj:334) leiningen.core.main$apply_task.invoke (main.clj:320) leiningen.core.main$resolve_and_apply.invokeStatic (main.clj:343) leiningen.core.main$resolve_and_apply.invoke (main.clj:336) leiningen.update_in$update_in.invokeStatic (update_in.clj:37) leiningen.update_in$update_in.doInvoke (update_in.clj:24) clojure.lang.RestFn.applyTo (RestFn.java:146) clojure.lang.Var.applyTo (Var.java:705) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$partial_task$fn__6592.doInvoke (main.clj:284) clojure.lang.RestFn.applyTo (RestFn.java:139) clojure.lang.AFunction$1.doInvoke (AFunction.java:31) clojure.lang.RestFn.applyTo (RestFn.java:137) clojure.core$apply.invokeStatic (core.clj:667) clojure.core$apply.invoke (core.clj:660) leiningen.core.main$apply_task.invokeStatic (main.clj:334) leiningen.core.main$apply_task.invoke (main.clj:320) leiningen.core.main$resolve_and_apply.invokeStatic (main.clj:343) leiningen.core.main$resolve_and_apply.invoke (main.clj:336) leiningen.core.main$_main$fn__6681.invoke (main.clj:452) leiningen.core.main$_main.invokeStatic (main.clj:442) leiningen.core.main$_main.doInvoke (main.clj:439) clojure.lang.RestFn.applyTo (RestFn.java:137) clojure.lang.Var.applyTo (Var.java:705) clojure.core$apply.invokeStatic (core.clj:665) clojure.main$main_opt.invokeStatic (main.clj:491) clojure.main$main_opt.invoke (main.clj:487) clojure.main$main.invokeStatic (main.clj:598) clojure.main$main.doInvoke (main.clj:561) clojure.lang.RestFn.applyTo (RestFn.java:137) clojure.lang.Var.applyTo (Var.java:705) clojure.main.main (main.java:37) ```

I guess that means the official nixpkgs.emacsPackages.ejc-sql package should depend on leinigen with a preinstalled nrepl and all dependencies in advance, otherwise it won't work. Or maybe there's a setting to say "act normally and install to ~/.leiningen" or wherever that is.

The reason for this is in clomacs-launch-nrepl where the default directory seems to be where the library is.

For nix here that is the read only directory:

/nix/store/ay75a41p8z50654qq9afaakmbj9wwpxi-emacs-packages-deps/share/emacs/site-lisp/elpa/ejc-sql-20200607.2010/

I tried a naieve kind of change to just always set the directory to one place but that didn't seem to fix things:

(defun clomacs-launch-nrepl (lib-name
                             wrapped-eval
                             attributes
                             nrepl-ready-callback
                             backend)
  (let* ((starting-msg (format
                        "Starting nREPL server for %s..."
                        (propertize (or lib-name "current-buffer")
                                    'face 'font-lock-keyword-face)))
         (project-dir "/home/cody/nrepl-temp/") -- NOTE me trying to set the project-dir to a constant place I know I can write to on nixos
         (params (if project-dir (list :project-dir project-dir))))
    ;; simple run lein
    (pcase backend
      (:clj (clomacs-jack-in-clj params
                                 wrapped-eval
                                 attributes
                                 nrepl-ready-callback))
      (:cljs (clomacs-jack-in-cljs params
                                   wrapped-eval
                                   attributes
                                   nrepl-ready-callback))
      (_ (error "Unknown backend %s" backend)))
    (message starting-msg))
  nil)

Actually no, it did:

[nREPL] Starting server via /home/cody/.nix-profile/bin/lein update-in :dependencies conj \[nrepl\ \"0.8.0-alpha3\"\] -- update-in :plugins conj \[cider/cider-nrepl\ \"0.25.3-SNAPSHOT\"\] -- repl :headless :host localhost
Starting nREPL server for ejc-sql...
nil
[nREPL] server started on 37749
[nREPL] Establishing direct connection to localhost:37749 ...
[nREPL] Direct connection to localhost:37749 established

My test code was just wrong:

(clomacs-with-nrepl "ejc-sql" (message "hi"))

I did something wrong since ejc-connect-interactive now throws this error:

nrepl-send-sync-request: Wrong type argument: stringp, nil

[kostafey]

Hi, @codygman. At this moment, using the write-protected project directory is impossible. nREPL needs to create .nrepl-port file and it is not an option: https://github.com/nrepl/nrepl/blob/35e8eb5ba2c05c7063b8e794e6f2d62f587646cd/src/clojure/nrepl/cmdline.clj#L412

I guess that means the official nixpkgs.emacsPackages.ejc-sql package should depend on leinigen

I don't maintain nixpkg ejc-sql package. At this moment the only preferred way to install ejc-sql is by MEPLA: https://github.com/kostafey/ejc-sql#installation. And obviously, if you want, you can clone this repository to your preferred folder manually and configure Emacs to load the package from this directory.

I tried a naieve kind of change to just always set the directory to one place but that didn't seem to fix things:

As far as I know, it's rather useless, since project-dir should be configured properly to locate project.clj (build.boot) file.

(clomacs-with-nrepl "ejc-sql" (message "hi"))

Function is expected as clomacs-with-nrepl body:

(clomacs-with-nrepl "ejc-sql"
  (lambda ()
    (message "hi")))

So, the main idea of clomacs is not to create mixed Elisp-Clojure Emacs extensions only, but to create them totally introspective and interact with Clojure code as Emacs to its own Elisp. This is achieved by CIDER. I think it's possible to add embedded nREPL to ejc-sql than connect to it via CIDER as always: https://nrepl.org/nrepl/usage/server.html#_embedding_nrepl But anyway, I don't sure I'll implement it very soon. So, the best way to use ejc-sql at this monument is to install it as expected: via MELPA: https://github.com/kostafey/ejc-sql#installation.

[codygman]

Okay, I'll close this for now then.

Sadly though, for nix users installing via this repo or melpa will give the same error since both will want to write inside of /nix.

For any curious searchers who might want to use ejc-sql on nix I left off at setting project-dir to /tmp and got a new error that seems it could be elisp related. Here is the code, error is below.This was with commit

...
[nREPL] Direct connection to localhost:33047 established
nrepl-send-sync-request: Wrong type argument: stringp, nil
[nREPL] server started on 45381
[nREPL] Establishing direct connection to localhost:45381 ...
[nREPL] Direct connection to localhost:45381 established
nrepl-send-sync-request: Wrong type argument: stringp, nil
...

[WeissP]

I thought I could get rid of ejc-sql, but it turned out not to be possible :). So here is my workaround to (imperfectly) fix this issue:

Simply execute the following code before starting the REPL:

(setq ejc-sql-lib-path
      (clojure-project-dir
       (file-name-directory (find-library-name "ejc-sql"))))
(setq ejc-repl-dir "/tmp/ejc-sql")
(unless (file-directory-p ejc-repl-dir)
  (copy-directory ejc-sql-lib-path ejc-repl-dir nil t t)
  (set-file-modes ejc-repl-dir 493))
(defun find-library-name-overriding-ejc (lib-name)
  "Replace the library dir of ejc-sql"
  (when (string= lib-name "ejc-sql") (format "%s/ejc-sql.el" ejc-repl-dir)))
(advice-add 'find-library-name :before-until #'find-library-name-overriding-ejc)

The idea is simple: copy the source directory to /tmp and let find-library-name find ejc-sql in /tmp.