From c54dd89279405dfdf35a78bc6157f850c834d9d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christopher=20M=C3=BChl?= <toki@toph.so>
Date: Wed, 4 Mar 2026 17:45:45 +0100
Subject: [PATCH] fix: ensure /var/tmp exists for skopeo operations

Skopeo may use /var/tmp for temporary files during docker-archive
operations, even when TMPDIR is set. Create the directory to prevent
'no such file or directory' errors.
---
 docker-build-nix/action.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docker-build-nix/action.yaml b/docker-build-nix/action.yaml
index b79ce38..1680db6 100644
--- a/docker-build-nix/action.yaml
+++ b/docker-build-nix/action.yaml
@@ -91,6 +91,9 @@ runs:
         export TMPDIR="${TMPDIR:-/tmp}"
         mkdir -p "$TMPDIR"
 
+        # Ensure /var/tmp exists as fallback (skopeo may use this)
+        sudo mkdir -p /var/tmp 2>/dev/null || mkdir -p /var/tmp || true
+
         # Build skopeo command with optional credentials
         SKOPEO_CMD="skopeo copy"
         if [ -n "${{ inputs.registry-username }}" ] && [ -n "${{ inputs.registry-password }}" ]; then