From d8a0a9ca4d532359f04d1dff7565ed8122d1b052 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Sat, 7 Feb 2026 12:42:46 -0600
Subject: [PATCH] fix: Use dynamic path for release directory in postInstall

Instead of hardcoding the version in the path, find the release
directory dynamically. This fixes the 'undefined variable version'
error during Docker image build.
---
 nix/build.nix | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/nix/build.nix b/nix/build.nix
index 09dbe12f..1a115f7d 100644
--- a/nix/build.nix
+++ b/nix/build.nix
@@ -79,15 +79,20 @@ beamPackages.mixRelease {
 
   # Install MIB files to the release
   postInstall = ''
-    # Copy MIB files directory
-    if [ -d "$src/priv/mibs" ]; then
-      mkdir -p $out/lib/towerops-${version}/priv/mibs
-      cp -r $src/priv/mibs/* $out/lib/towerops-${version}/priv/mibs/
-    fi
+    # Find the release directory (mixRelease creates lib/<name>-<version>)
+    RELEASE_DIR=$(find $out/lib -maxdepth 1 -type d -name "towerops-*" | head -1)
 
-    # Ensure NIF is in the release
-    mkdir -p $out/lib/towerops-${version}/priv
-    cp ${towerops-nif}/lib/towerops_nif.so $out/lib/towerops-${version}/priv/
+    if [ -n "$RELEASE_DIR" ]; then
+      # Copy MIB files directory
+      if [ -d "$src/priv/mibs" ]; then
+        mkdir -p $RELEASE_DIR/priv/mibs
+        cp -r $src/priv/mibs/* $RELEASE_DIR/priv/mibs/
+      fi
+
+      # Ensure NIF is in the release
+      mkdir -p $RELEASE_DIR/priv
+      cp ${towerops-nif}/lib/towerops_nif.so $RELEASE_DIR/priv/
+    fi
   '';
 
   meta = {