squashed upstream a683adc19ff5228af548c6539dbc3440509bfed3

Author: mightyiam

.devcontainer/devcontainer.json

@@ -0,0 +1,34 @@
+{
+  "name": "nixpkgs",
+  "image": "mcr.microsoft.com/devcontainers/universal:2-linux",
+  "features": {
+    "ghcr.io/devcontainers/features/nix:1": {
+      // fails in the devcontainer sandbox, enable sandbox via config instead
+      "multiUser": false,
+      "packages": "nixpkgs.nixd,nixpkgs.nixfmt",
+      "useAttributePath": true,
+      "extraNixConfig": "experimental-features = nix-command flakes,sandbox = true"
+    }
+  },
+  // Fixup permissions inside container.
+  // https://github.com/NixOS/nix/issues/6680#issuecomment-1230902525
+  "postCreateCommand": "sudo apt-get install -y acl",
+  "postStartCommand": "sudo setfacl -k /tmp; if [ -e /dev/kvm ]; then sudo chgrp $(id -g) /dev/kvm; fi",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "jnoortheen.nix-ide"
+      ],
+      "settings": {
+        "[nix]": {
+            "editor.formatOnSave": true
+        },
+        "nix.enableLanguageServer": true,
+        "nix.serverPath": "nixd"
+      }
+    }
+  },
+  "remoteEnv": {
+    "NIXPKGS": "/workspaces/nixpkgs"
+  }
+}

.editorconfig

@@ -0,0 +1,95 @@
+# EditorConfig configuration for nixpkgs
+# https://EditorConfig.org
+
+# Top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file, utf-8 charset
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+# Ignore diffs/patches
+[*.{diff,patch}]
+end_of_line = unset
+insert_final_newline = unset
+trim_trailing_whitespace = unset
+
+# We want readFile .version to return the version without a newline.
+[.version]
+insert_final_newline = false
+
+# see https://nixos.org/nixpkgs/manual/#chap-conventions
+
+# Match json/lockfiles/markdown/nix/perl/python/ruby/shell/docbook files, set indent to spaces
+[*.{bash,js,json,lock,md,nix,pl,pm,py,rb,sh,xml}]
+indent_style = space
+
+# Match docbook files, set indent width of one
+[*.xml]
+indent_size = 1
+
+# Match json/lockfiles/markdown/nix/ruby files, set indent width of two
+[*.{js,json,lock,md,nix,rb}]
+indent_size = 2
+
+# Match all the Bash code in Nix files, set indent width of two
+[*.{bash,sh}]
+indent_size = 2
+
+# Match Perl and Python scripts, set indent width of four
+[*.{pl,pm,py}]
+indent_size = 4
+
+# Match gemfiles, set indent to spaces with width of two
+[Gemfile]
+indent_size = 2
+indent_style = space
+
+# Match package.json and package-lock.json, which are generally pulled from upstream and accept them as they are
+[package{,-lock}.json]
+indent_style = unset
+insert_final_newline = unset
+
+# Disable file types or individual files
+# some of these files may be auto-generated and/or require significant changes
+
+[*.{c,h}]
+insert_final_newline = unset
+trim_trailing_whitespace = unset
+
+[*.{asc,key,ovpn}]
+insert_final_newline = unset
+end_of_line = unset
+trim_trailing_whitespace = unset
+
+[*.lock]
+indent_size = unset
+
+# Although Markdown/CommonMark allows using two trailing spaces to denote
+# a hard line break, we do not use that feature in nixpkgs since
+# it forces the surrounding paragraph to become a <literallayout> which
+# does not wrap reasonably.
+# Instead of a hard line break, start a new paragraph by inserting a blank line.
+[*.md]
+trim_trailing_whitespace = true
+
+# binaries
+[*.nib]
+end_of_line = unset
+insert_final_newline = unset
+trim_trailing_whitespace = unset
+charset = unset
+
+[eggs.nix]
+trim_trailing_whitespace = unset
+
+[registry.dat]
+end_of_line = unset
+insert_final_newline = unset
+
+# Keep this hint at the bottom:
+# Please don't add entries for subfolders here.
+# Create <subfolder>/.editorconfig instead.