From 18d2edf330e6932c177e71b1c7831a7a5ad77e38 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 18 Feb 2020 11:25:34 +0100
Subject: Add plain persistent nix-shell wrapper

Automatically adds GC roots, including a fix for an implicit interactiveBash dependency
---
 default.nix                           |  2 ++
 pkgs/persistent-nix-shell/default.nix | 20 ++++++++++++++++++++
 web/tree/info.md                      |  1 +
 3 files changed, 23 insertions(+)
 create mode 100644 pkgs/persistent-nix-shell/default.nix

diff --git a/default.nix b/default.nix
index 1552309..0e44786 100644
--- a/default.nix
+++ b/default.nix
@@ -15,5 +15,7 @@ let
     build-xslt  = callPackage ./pkgs/xslt/build-xslt  { };
     static-xslt = callPackage ./pkgs/xslt/static-xslt { };
     make-xslt   = callPackage ./pkgs/xslt/make-xslt   { };
+
+    persistent-nix-shell = callPackage ./pkgs/persistent-nix-shell { };
   };
 in custom
diff --git a/pkgs/persistent-nix-shell/default.nix b/pkgs/persistent-nix-shell/default.nix
new file mode 100644
index 0000000..8a74eb4
--- /dev/null
+++ b/pkgs/persistent-nix-shell/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, pkgs, ... }:
+
+pkgs.writeTextFile {
+  name        = "persistent-nix-shell";
+  executable  = true;
+  destination = "/bin/persistent-nix-shell";
+
+  text = ''
+    #!/bin/sh -eu
+
+    mkdir -p .gcroots
+
+    nix-instantiate shell.nix --indirect --add-root $PWD/.gcroots/shell.drv > /dev/null
+    nix-store -r $(nix-store --query --references $PWD/.gcroots/shell.drv) --indirect --add-root $PWD/.gcroots/shell.dep > /dev/null
+
+    # Fix to prevent implicit interactiveBash dependency
+    export NIX_BUILD_SHELL=/run/current-system/sw/bin/bash
+    exec nix-shell $(readlink $PWD/.gcroots/shell.drv) "$@"
+  '';
+}
diff --git a/web/tree/info.md b/web/tree/info.md
index cd1d773..1f95af9 100644
--- a/web/tree/info.md
+++ b/web/tree/info.md
@@ -32,6 +32,7 @@ Projects of my own:
 Configurations of my own:
 
 * [custom-neovim](https://code.kummerlaender.eu/pkgs/tree/pkgs/custom-neovim)
+* [persistent-nix-shell](https://code.kummerlaender.eu/pkgs/tree/pkgs/persistent-nix-shell)
 
 Projects neither of my own nor of my configuration:
 
-- 
cgit v1.2.3