yeet the nix flakes

this is, in the widest possible sense, a revert of
e88fed18f499a3e8ac98c772bbb62f00d1f8d1d7, which was now a little over
two years ago.

Of course, lots of things have changed since then:
 - this uses npins instead of niv, which is both simpler and still
   maintained
 - i haven't brought back the old deploy lib; I still use
   deploy-rs (with some modifications) to deploy things
 - if you actually use my stuff downstream, you can now use packages/ &
   tests/ & modules/ as entry points directly, while still having some
   control over inputs
 - (since i also don't believe any downstream users actually exist, i've
   not bothered to have a shim flake.nix so your stuff probably just
   broke. well, it was an experimental feature, anyways)
 - in general there's a lot more of the old-fashioned structure back
   again, with default.nix files in subdirectories that form a
   structure, not like how almost everything was just imported in the
   one big flake.nix file

For people who are interested in also having a non-flake config similar
to this one, it's probably best to take a look at inputs.nix (and also
at npins, of course)

1 files changed, 64 insertions, 0 deletions

diff --git a/npins/default.nix b/npins/default.nix
new file mode 100644
index 0000000..891db57
--- /dev/null
+++ b/npins/default.nix
@@ -0,0 +1,64 @@
+# Generated by npins. Do not modify; will be overwritten regularly
+let
+  requireFile = { sha256, hashMode ? "recursive" }:
+    builtins.derivation {
+      name = "source";
+      outputHashMode = hashMode;
+      outputHashAlgo = "sha256";
+      outputHash = sha256;
+      preferLocalBuild = true;
+      allowSubstitutes = false;
+      builder = "builtins:fetchurl";
+      system = "builtin"; # builtins.currentSystem;
+    };
+
+  data = builtins.fromJSON (builtins.readFile ./sources.json);
+  version = data.version;
+
+  mkSource = spec:
+    assert spec ? type; let
+      path =
+        if spec.type == "Git" then mkGitSource spec
+        else if spec.type == "GitRelease" then mkGitSource spec
+        else if spec.type == "PyPi" then mkPyPiSource spec
+        else if spec.type == "Channel" then mkChannelSource spec
+        else builtins.throw "Unknown source type ${spec.type}";
+    in
+    spec // { outPath = path; };
+
+  mkGitSource = { repository, revision, url ? null, hash, ... }:
+    assert repository ? type;
+    # At the moment, either it is a plain git repository (which has an url), or it is a GitHub/GitLab repository
+    # In the latter case, there we will always be an url to the tarball
+    if url != null then 
+      (builtins.fetchTarball {
+        inherit url;
+        sha256 = hash; # FIXME: check nix version & use SRI hashes
+      })
+    else assert repository.type == "Git"; 
+      let
+        cached = requireFile { sha256 = hash; };
+	fetched = builtins.fetchGit {
+          url = repository.url;
+          rev = revision;
+        };
+      in if builtins.pathExists (builtins.unsafeDiscardStringContext cached.outPath)
+        then cached.outPath 
+	else builtins.trace "npins: re-fetching source ${repository.url}" fetched.outPath;
+
+  mkPyPiSource = { url, hash, ... }:
+    builtins.fetchurl {
+      inherit url;
+      sha256 = hash;
+    };
+
+  mkChannelSource = { url, hash, ... }:
+    builtins.fetchTarball {
+      inherit url;
+      sha256 = hash;
+    };
+in
+if version == 3 then
+  builtins.mapAttrs (_: mkSource) data.pins
+else
+  throw "Unsupported format version ${toString version} in sources.json. Try running `npins upgrade`"