4 files changed, 16 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index d6944e3..feb036e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /result*
+/versions_log
diff --git a/nix_path_env b/nix_path_env
index 0ec2387..cfe37e6 100644
--- a/nix_path_env
+++ b/nix_path_env
@@ -9,4 +9,3 @@ fi
 nixpkgsPrevious="$nixpkgs"
 nixpkgsNext="$nixpkgs"
 export NIX_PATH="nixpkgs=$nixpkgs:nixpkgsNext=$nixpkgsNext:nixpkgsPrevious=$nixpkgsPrevious"
-
diff --git a/scripts/make-env b/scripts/make-env
index fc52adc..ebb1eed 100755
--- a/scripts/make-env
+++ b/scripts/make-env
@@ -4,3 +4,8 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 
 source $(dirname $DIR)/nix_path_env
 nix-env -r -i -A myEnvironments.immae-eu -f "<nixpkgs>" "$@"
+
+cat >> $(dirname $DIR)/versions_log <<EOF
+# Ran $(date) with args "$@"
+$($DIR/nix_infos | sed -e "s/^/#   /")
+EOF
diff --git a/scripts/nix_infos b/scripts/nix_infos
new file mode 100755
index 0000000..f824305
--- /dev/null
+++ b/scripts/nix_infos
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+source $(dirname $DIR)/nix_path_env
+version=$(nix eval --raw nixpkgs.lib.version)
+mainversion=$(echo $version | cut -d"." -f -2)
+
+echo "https://releases.nixos.org/nixos/$mainversion/nixos-$version/nixexprs.tar.xz"
+nix eval --raw nixpkgs.bc.meta.position | cut -d"/" -f-4