From 6c6d6395f112998f586cae70e77a92c23ea376c3 Mon Sep 17 00:00:00 2001
From: alexander <259883306+AlexHardAtWork@users.noreply.github.com>
Date: Mon, 12 Oct 2026 13:40:19 +0000
Subject: [PATCH] fix(flake-closure-diff): pass the head profile as an absolute
 path
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nix reads a relative path argument as a flake reference: it resolved the
.profile symlink and then rejected the store path with "is not a flake (because
it's not a directory)", so every run failed at the report step. An absolute path
under the store is recognised as a store path, which is what diff-closures
wants. The base side was already absolute, from mktemp -d.

Found on the first real run — solution-arsenal#858, the first consumer to call
this — and reproduced locally: the relative form gives exactly the CI error, the
absolute form prints the diff and exits 0.
---
 .github/workflows/flake-closure-diff.yml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/flake-closure-diff.yml b/.github/workflows/flake-closure-diff.yml
index 7a90c7e..6c4d8c1 100644
--- a/.github/workflows/flake-closure-diff.yml
+++ b/.github/workflows/flake-closure-diff.yml
@@ -96,7 +96,12 @@ jobs:
           ATTR: ${{ inputs.attribute }}
         run: |
           nix develop --profile .profile ".#$ATTR" --command true
-          echo "path=.profile" >> "$GITHUB_OUTPUT"
+          # Absolute, because nix reads a relative path as a flake reference:
+          # it resolves the profile symlink and then rejects the store path with
+          # "is not a flake (because it's not a directory)". An absolute path
+          # under the store is recognised as a store path, which is what
+          # diff-closures wants.
+          echo "path=$PWD/.profile" >> "$GITHUB_OUTPUT"
 
       - name: Report the difference
         if: steps.before.outputs.path != ''