From cbe7d2586a6f65179f2966459aa0181f41655419 Mon Sep 17 00:00:00 2001
From: Marien Zwart <marien.zwart@gmail.com>
Date: Sat, 18 May 2024 15:35:08 +1000
Subject: [PATCH] Attempt to fix emms
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CI fails to fetch it:

```
error: Server does not allow request for unadvertised object 87d0d1fb0566a80229029d0d8d7c863138d70aae
warning: could not update mtime for file '/home/runner/.cache/nix/gitv3/0gjpwip102kwcvz961gsiva3lqmmr6266s5wzs8kq0ybm68gwpx9/refs/heads/master': No such file or directory
error:
       … while checking flake output 'checks'
         at /nix/store/fwrwzxjvvpx1l27h8j5f9gffzwn2vdik-source/flake.nix:54:7:
           53|     in {
           54|       checks = perSystemPackages (pkgs:
             |       ^
           55|         let
       … while checking the derivation 'checks.x86_64-linux.full'
         at /nix/store/fwrwzxjvvpx1l27h8j5f9gffzwn2vdik-source/flake.nix:83:11:
           82|           })).emacsWithDoom;
           83|           full = mkDoom {
             |           ^
           84|             full = true;
       (stack trace truncated; use '--show-trace' to show the full trace)
       error: Cannot find Git revision '87d0d1fb0566a80229029d0d8d7c863138d70aae' in ref 'refs/heads/master' of repository 'https://git.savannah.gnu.org/git/emms.git'! Please make sure that the rev exists on the ref you've specified or add allRefs = true; to fetchGit.
```

Try to follow the suggestions from the error message, as I do see the
commit in https://git.savannah.gnu.org/cgit/emms.git/.

I'm not sure why this is only failing now...
---
 default.nix         | 3 ++-
 fetch-overrides.nix | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index a96232f..188f0fd 100644
--- a/default.nix
+++ b/default.nix
@@ -52,7 +52,7 @@
 }:
 let
   inherit (lib) optionalAttrs optionalString;
-  inherit (import ./fetch-overrides.nix) extraPins extraUrls;
+  inherit (import ./fetch-overrides.nix) extraPins extraUrls allRefsRepos;
 
   # Step 1: determine which Emacs packages to pull in.
   #
@@ -237,6 +237,7 @@ let
               {
                 inherit url;
                 rev = pin;
+                allRefs = allRefsRepos.${url} or false;
                 submodules = !(p.recipe.nonrecursive or false);
                 # TODO: pull ref from derivation.src when not pulling it from p.recipe?
                 # Note Doom does have packages with pin + branch (or nonrecursive) set,
diff --git a/fetch-overrides.nix b/fetch-overrides.nix
index 9151a4a..fda9422 100644
--- a/fetch-overrides.nix
+++ b/fetch-overrides.nix
@@ -34,4 +34,9 @@
     # Looks stable enough we can get away with pinning it.
     "sly-stepper" = "da84e3bba8466c2290c2dc7c27d7f4c48c27b39e";
   };
+
+  # TODO figure out whether we're better off always setting allRefs.
+  allRefsRepos = {
+    "https://git.savannah.gnu.org/git/emms.git" = true;
+  };
 }