push sheeet

pkgs/build-support/fetchfossil/builder.sh

@@ -0,0 +1,19 @@
+echo "Cloning Fossil $url [$rev] into $out"
+
+# Fossil, bless its adorable little heart, wants to write global configuration
+# to $HOME/.fossil. AFAICT, there is no way to disable this functionality.
+# Instead, we'll let it write to the build directory.
+export HOME=$(pwd)
+
+# We must explicitly set the admin user for the clone to something reasonable.
+fossil clone -A nobody "$url" fossil-clone.fossil
+
+mkdir fossil-clone
+WORKDIR=$(pwd)
+mkdir $out
+pushd $out
+fossil open "$WORKDIR/fossil-clone.fossil" "$rev"
+popd
+
+# Just nuke the checkout file.
+rm $out/.fslckout

pkgs/build-support/fetchfossil/default.nix

@@ -0,0 +1,35 @@
+{
+  stdenv,
+  lib,
+  fossil,
+  cacert,
+}:
+
+lib.fetchers.withNormalizedHash { } (
+  {
+    name ? null,
+    url,
+    rev,
+    outputHash ? lib.fakeHash,
+    outputHashAlgo ? null,
+  }:
+
+  stdenv.mkDerivation {
+    name = "fossil-archive" + (lib.optionalString (name != null) "-${name}");
+    builder = ./builder.sh;
+    nativeBuildInputs = [
+      fossil
+      cacert
+    ];
+
+    # Envvar docs are hard to find. A link for the future:
+    # https://www.fossil-scm.org/index.html/doc/trunk/www/env-opts.md
+    impureEnvVars = [ "http_proxy" ];
+
+    inherit outputHash outputHashAlgo;
+    outputHashMode = "recursive";
+
+    inherit url rev;
+    preferLocalBuild = true;
+  }
+)