Add nix-bootstrap.sh script.

nix-bootstrap.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+cmd=sh
+if ! [ $# -eq 0 ]; then
+    cmd=$@
+fi
+
+# should download this in the future
+# but the mirror is down
+proot=`dirname $0`/proot-`uname -p`
+export PROOT_NO_SECCOMP=1
+
+if [ -e $HOME/.nix-profile/etc/profile.d/nix.sh ]; then . $HOME/.nix-profile/etc/profile.d/nix.sh; fi
+
+if [ -z "$IN_PROOT" ]; then
+    export IN_PROOT=1
+
+    if ! [ -d $HOME/.nix ]; then
+        mkdir -p $HOME/.nix
+        s=$(mktemp)
+        curl https://nixos.org/nix/install -o $s
+        $proot -b $HOME/.nix:/nix $0 sh $s
+    fi
+
+    $proot -b $HOME/.nix:/nix $0 $cmd
+
+    export IN_PROOT=
+    exit
+elif ! [ $# -eq 0 ]; then
+    exec $cmd
+fi