feat: set system.configurationRevisionHEADmaster

2 files changed, 13 insertions, 0 deletions

diff --git a/nixos/profiles/common/default.nix b/nixos/profiles/common/default.nix
index 1705adf..0681dde 100644
--- a/nixos/profiles/common/default.nix
+++ b/nixos/profiles/common/default.nix
@@ -1,6 +1,12 @@
 { config, pkgs, ... }:
 
 {
+  system.configurationRevision =
+    let
+      revision = builtins.getEnv "NIXOS_CONFIG_REVISION";
+    in
+    if revision == "" then null else revision;
+
   imports =
     let
       sources = import <top/npins>;
diff --git a/nixos/rebuild b/nixos/rebuild
index bb44fe8..d714977 100755
--- a/nixos/rebuild
+++ b/nixos/rebuild
@@ -25,6 +25,13 @@ if [ ! -f "$configPath" ]; then
   exit 1
 fi
 
+# Make the configuration repository's commit available to the NixOS module.
+export NIXOS_CONFIG_REVISION
+NIXOS_CONFIG_REVISION=$(git -C "$top" rev-parse --verify HEAD)
+if [[ -n $(git -C "$top" status --porcelain) ]]; then
+  NIXOS_CONFIG_REVISION+="-dirty"
+fi
+
 nixpkgsPath=$(
   cd "$top" &&
   nix-instantiate --eval --raw \