1 files changed, 13 insertions, 0 deletions
diff --git a/bin/nixpkgs-rev b/bin/nixpkgs-rev
new file mode 100755
index 0000000..1acde1e
--- /dev/null
+++ b/bin/nixpkgs-rev
@@ -0,0 +1,13 @@
+#! /bin/sh
+# nixpkgs-rev : nixos-config -> git_rev
+set -euf
+nix-instantiate \
+    -I nixos-config="$1" \
+    --eval \
+    --json \
+    -E \
+    '
+      (import <nixos-config> {config={}; pkgs={};}).nixpkgs.rev
+    ' \
+    2> /dev/null \
+  | jq -r . 2> /dev/null