How to override an emacs package src.url to fix 404

Thanks @Samae that’s gotten me closer.

I’ve tried to use something similar to what @codygman posted as a workaround Overriding a transitive emacs dependency - #4 as @TLATER suggested.

But what I’ve got isn’t quite working… yet…

# ~/.config/nixpkgs/config.nix
...
    myEmacsConfig = ./overlays/pkgs/emacs;
    myBaseDir = "${toString ./..}";

    emacsOverrides = self: super: rec {
      spinner = super.spinner.override {
        elpaBuild = args: super.elpaBuild (args // {
	  src = (builtins.fetchurl {
	    url = "https://elpa.gnu.org/packages/spinner-1.7.3.el.lz";
	    sha256 = "188i2r7ixva78qd99ksyh3jagnijpvzzjvvx37n57x8nkp8jc4i4";
	  });
	});
      };
    };

    myEmacs = (((pkgs.emacsPackagesGen pkgs.emacs).overrideScope' emacsOverrides).emacsWithPackages (epkgs: with epkgs;

      # CONFIG setup
      [
        (runCommand "default.el" {} ''
          mkdir -p $out/share/emacs/site-lisp
          cp ${myEmacsConfig}/*.el $out/share/emacs/site-lisp/

          if [ -d ${myBaseDir}/custom/emacs ]; then
            mkdir -p $out/share/emacs/site-lisp/custom
            cp ${myBaseDir}/custom/emacs/*.el $out/share/emacs/site-lisp/custom/
          fi
        '')
      ] ++

      [

      # elpa
      spinner
      ...
   ]
  ));
...
``

Error log...

% nix-env -iA nixpkgs.myEmacs
installing ‘emacs-with-packages-27.2’
these derivations will be built:
/nix/store/rp0kdv3q6x07zknvvgs4gbwzmxbbwkyj-zoom-window-recipe.drv
/nix/store/2jl6cym0ij1z7bj54cq0b33sdi7837qp-emacs-zoom-window-20201205.1038.drv
/nix/store/48ppp1h6ikpcakxsr2s0py5f53r9d6wg-tablist-recipe.drv
/nix/store/y2vcqiz31gxaw170av180b1g6rdc6diz-vterm-recipe.drv
/nix/store/4azniim7vwv6wcwfji52nqp1w6lxz9sd-emacs-vterm-20210618.1922.drv
/nix/store/72np6zris3n688g325w1p31h6200j9ss-emacs-tablist-20200427.2205.drv
/nix/store/9vxxbm25zv1yyn47cbfp37zl1z3hcqz0-yaml-mode-recipe.drv
/nix/store/pk3vnwkwdlh95fw8ymzxcbx78a9biqy8-emacs-yaml-mode-20210508.1641.drv
/nix/store/df55dxj5qbq6jcssbgnkl0yfy0a1r9kf-emacs-gitlab-ci-mode-20191022.2017.drv
/nix/store/7c34ng8f4861mn9lkq4cj8zgsz24xlw8-emacs-gitlab-ci-mode-flycheck-20190323.1829.drv
/nix/store/8bs7djam419llrqh7bbqdch18w54zd7w-emacs-docker-compose-mode-20200830.1336.drv
/nix/store/8nk25cmjdnfx634y4x8xkm088g3x6aab-emacs-git-timemachine-20210528.908.drv
/nix/store/8nkmqizqbp044rnsr2a0ypqm9llv4x3i-undo-tree-0.7.5.el.drv
/nix/store/9fx7c786jmhh3s29ri7x9k25m9849kas-yasnippet-recipe.drv
/nix/store/nzq9k2rhvlg862vjmxxzq0w4i1inpdhz-treemacs-recipe.drv
/nix/store/fb5zg7hg4fh1ghg93llxpdz78sph0zdl-emacs-treemacs-20210606.1918.drv
/nix/store/y9id333ns73qdd38bx9rgnxa06fi47nw-emacs-spinner-1.7.3.drv
/nix/store/n84904lskaj8rwm6bjrs201jrvq1hfhl-emacs-lsp-mode-20210630.2003.drv
/nix/store/kzn7zlk8cbx0qlnskbg8aiycgky81jhh-emacs-lsp-treemacs-20210618.1722.drv
/nix/store/i69w2nvbzzzabf0npgab3vx1vh6wbkdz-emacs-dap-mode-20210519.1554.drv
/nix/store/amxj8hq7q4pfqflhfcdlq122fbllgxbv-emacs-lsp-java-20210701.725.drv
/nix/store/xvkwpih20zw92k17dmlgn8q2jlsc0bww-use-package-recipe.drv
/nix/store/ariyk8kybh5i858c9lkxhijldcd4vw3c-emacs-use-package-20210207.1926.drv
/nix/store/i1wwg19267x40z70i79izcfvhp9h634g-emacs-helm-lsp-20210419.2014.drv
/nix/store/l31qirm9d3azhaq7grcmk4d8lgggwf2c-emacs-docker-20210624.1359.drv
/nix/store/l8yqkzmamg56wbw1daiwzpy6w9cazlin-treepy-recipe.drv
/nix/store/ns4fbiacfc3k9y6d0x8r0k5q33nk5sw3-emacs-treepy-20191108.2217.drv
/nix/store/cxk2fbkzlhqfp7j1fwmfzq5b08yy52yv-emacs-ghub-20210619.1405.drv
/nix/store/j12p1al0dqgcgx7cj5ff8y0d0d55f01c-yaml-recipe.drv
/nix/store/hgsmz79x6fnyi38imc9pgvamn9v33yag-emacs-yaml-20210625.528.drv
/nix/store/yr1nlzdxws7b0j0kzjj5fb3i1bhiyljp-emacs-magit-20210701.1554.drv
/nix/store/mxzx5ijv58bmisvmp8v31gvs62vhka5y-emacs-forge-20210628.736.drv
/nix/store/nrf9df26ms0qkcb76ps2c9qach4zfq4j-emacs-undo-tree-0.7.5.drv
/nix/store/q5m44r5iwmvkbs5rxwgvapsy0yww1s3w-emacs-yasnippet-20200604.246.drv
/nix/store/s2kk2nycjnmx3ykaf7s7wgnb8pcw3i6c-emacs-lsp-metals-20210615.1413.drv
/nix/store/xa09pq2w29r14mnrjcxpanpmmg1p0v93-emacs-lsp-ui-20210619.905.drv
/nix/store/mjrl96v0l5fcpcn525ww83s6l50bf69q-which-key-recipe.drv
/nix/store/xfidhaf5daplb03k69fbhnb3jam4fbd4-emacs-which-key-20210630.1217.drv
/nix/store/jh8gkgfhjlcyfnyzklk9p48zxwgpjrsm-emacs-packages-deps.drv
/nix/store/aqc1hqjlbzmshp6mc3rzihggaiink0hi-emacs-with-packages-27.2.drv
building ‘/nix/store/8nk25cmjdnfx634y4x8xkm088g3x6aab-emacs-git-timemachine-20210528.908.drv’…
unpacking sources
unpacking source archive /nix/store/dxxi87g4kc02d65pgn1mpa2k4xiqgz0c-source
source root is source
patching sources
configuring
no configure script, doing nothing
building
installing
INFO Scraping files for git-timemachine-autoloads.el…
INFO Scraping files for git-timemachine-autoloads.el…done
Checking /nix/store/jylgivgdjyq5jw8q68wgzpdb4kf3wyrs-emacs-git-timemachine-20210528.908/share/emacs/site-lisp/elpa/git-timemachine-20210528.908…
Compiling /nix/store/jylgivgdjyq5jw8q68wgzpdb4kf3wyrs-emacs-git-timemachine-20210528.908/share/emacs/site-lisp/elpa/git-timemachine-20210528.908/git-timemachine-autoloads.el…
Compiling /nix/store/jylgivgdjyq5jw8q68wgzpdb4kf3wyrs-emacs-git-timemachine-20210528.908/share/emacs/site-lisp/elpa/git-timemachine-20210528.908/git-timemachine-pkg.el…
Compiling /nix/store/jylgivgdjyq5jw8q68wgzpdb4kf3wyrs-emacs-git-timemachine-20210528.908/share/emacs/site-lisp/elpa/git-timemachine-20210528.908/git-timemachine.el…
define-transient-command' is an obsolete alias (as of Transient 0.3.0); use transient-define-prefix’ instead.
Done (Total of 1 file compiled, 2 skipped)
post-installation fixup
strip is /nix/store/bk80xfmnyv85jv4cvz81kgd77h7vljnl-cctools-binutils-darwin-949.0.1/bin/strip
patching script interpreter paths in /nix/store/jylgivgdjyq5jw8q68wgzpdb4kf3wyrs-emacs-git-timemachine-20210528.908
building ‘/nix/store/yr1nlzdxws7b0j0kzjj5fb3i1bhiyljp-emacs-magit-20210701.1554.drv’…
unpacking sources
unpacking source archive /nix/store/l6v2mgvyc36s3y39l5ngi2ajpf577vgf-source
source root is source
patching sources
configuring
no configure script, doing nothing
building
Copying files (->) and directories (=>)
from /private/tmp/nix-build-emacs-magit-20210701.1554.drv-0/working/magit/
to /private/tmp/nix-build-emacs-magit-20210701.1554.drv-0/magitwh3qBY/magit-20210701.1554
! lisp/magit-apply.el → magit-apply.el
! lisp/magit-autorevert.el → magit-autorevert.el
! lisp/magit-bisect.el → magit-bisect.el
! lisp/magit-blame.el → magit-blame.el
! lisp/magit-bookmark.el → magit-bookmark.el
! lisp/magit-branch.el → magit-branch.el
! lisp/magit-clone.el → magit-clone.el
! lisp/magit-commit.el → magit-commit.el
! lisp/magit-core.el → magit-core.el
! lisp/magit-diff.el → magit-diff.el
! lisp/magit-ediff.el → magit-ediff.el
! lisp/magit-extras.el → magit-extras.el
! lisp/magit-fetch.el → magit-fetch.el
! lisp/magit-files.el → magit-files.el
! lisp/magit-git.el → magit-git.el
! lisp/magit-gitignore.el → magit-gitignore.el
! lisp/magit-imenu.el → magit-imenu.el
! lisp/magit-log.el → magit-log.el
! lisp/magit-margin.el → magit-margin.el
! lisp/magit-merge.el → magit-merge.el
! lisp/magit-mode.el → magit-mode.el
! lisp/magit-notes.el → magit-notes.el
! lisp/magit-obsolete.el → magit-obsolete.el
! lisp/magit-patch.el → magit-patch.el
! lisp/magit-pkg.el → magit-pkg.el
! lisp/magit-process.el → magit-process.el
! lisp/magit-pull.el → magit-pull.el
! lisp/magit-push.el → magit-push.el
! lisp/magit-reflog.el → magit-reflog.el
! lisp/magit-refs.el → magit-refs.el
! lisp/magit-remote.el → magit-remote.el
! lisp/magit-repos.el → magit-repos.el
! lisp/magit-reset.el → magit-reset.el
! lisp/magit-sequence.el → magit-sequence.el
! lisp/magit-stash.el → magit-stash.el
! lisp/magit-status.el → magit-status.el
! lisp/magit-submodule.el → magit-submodule.el
! lisp/magit-subtree.el → magit-subtree.el
! lisp/magit-tag.el → magit-tag.el
! lisp/magit-transient.el → magit-transient.el
! lisp/magit-utils.el → magit-utils.el
! lisp/magit-wip.el → magit-wip.el
! lisp/magit-worktree.el → magit-worktree.el
! lisp/magit.el → magit.el
! lisp/git-rebase.el → git-rebase.el
! Documentation/magit.texi → magit.texi
! Documentation/AUTHORS.md → AUTHORS.md
LICENSE → LICENSE
Created /private/tmp/nix-build-emacs-magit-20210701.1554.drv-0/magitwh3qBY/magit-20210701.1554/magit.info
Removing /private/tmp/nix-build-emacs-magit-20210701.1554.drv-0/magitwh3qBY/magit-20210701.1554/magit.texi
installing
Parsing tar file…
Parsing tar file…done
Parsing tar file…
Parsing tar file…done
Extracting… \
Extracting…done
INFO Scraping files for magit-autoloads.el…
INFO Scraping files for magit-autoloads.el…done
Checking /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/git-rebase.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-apply.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-autoloads.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-autorevert.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-bisect.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-blame.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-bookmark.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-branch.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-clone.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-commit.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-core.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-diff.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-ediff.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-extras.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-fetch.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-files.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-git.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-gitignore.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-imenu.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-log.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-margin.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-merge.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-mode.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-notes.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-obsolete.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-patch.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-pkg.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-process.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-pull.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-push.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-reflog.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-refs.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-remote.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-repos.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-reset.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-sequence.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-stash.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-status.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-submodule.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-subtree.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-tag.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-transient.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-utils.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-wip.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit-worktree.el…
Compiling /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554/share/emacs/site-lisp/elpa/magit-20210701.1554/magit.el…
Done (Total of 44 files compiled, 2 skipped)
Parsing tar file…
Parsing tar file…done
post-installation fixup
strip is /nix/store/bk80xfmnyv85jv4cvz81kgd77h7vljnl-cctools-binutils-darwin-949.0.1/bin/strip
patching script interpreter paths in /nix/store/5hrkv8cyi6ly04rznvmm7wgvg2g87mgm-emacs-magit-20210701.1554
building ‘/nix/store/y9id333ns73qdd38bx9rgnxa06fi47nw-emacs-spinner-1.7.3.drv’…
installing
Lzip uncompressing 03z11ncdnjdsd0bw2ib6dwxl0fap10pw-spinner-1.7.3.el.lz…
Opening input file: error Lzip uncompressing 03z11ncdnjdsd0bw2ib6dwxl0fap10pw-spinner-1.7.3.el.lz, /nix/store/03z11ncdnjdsd0bw2ib6dwxl0fap10pw-spinner-1.7.3.el.lz
builder for ‘/nix/store/y9id333ns73qdd38bx9rgnxa06fi47nw-emacs-spinner-1.7.3.drv’ failed with exit code 255
cannot build derivation ‘/nix/store/aqc1hqjlbzmshp6mc3rzihggaiink0hi-emacs-with-packages-27.2.drv’: 1 dependencies couldn’t be built
error: build of ‘/nix/store/aqc1hqjlbzmshp6mc3rzihggaiink0hi-emacs-with-packages-27.2.drv’ failed