From 9b3fe67266ca1a42f18e00f36a62608662fb1a4d Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Tue, 21 Sep 2021 13:43:34 +0200
Subject: [PATCH] docker: use build cache

---
 packaging/docker/Dockerfile.fedora | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packaging/docker/Dockerfile.fedora b/packaging/docker/Dockerfile.fedora
index d494e2658..6c453489b 100644
--- a/packaging/docker/Dockerfile.fedora
+++ b/packaging/docker/Dockerfile.fedora
@@ -24,6 +24,7 @@ ARG DISTRO=fedora
 ARG FEDORA_VERSION=34
 ARG ARCH=x86_64
 ARG TRIPLET=x86_64-linux-gnu
+ARG REF=unknown
 
 FROM ${DISTRO}:${FEDORA_VERSION} AS dev
 
@@ -107,9 +108,9 @@ FROM dev AS app
 
 COPY . /villas/
 
-RUN rm -rf /villas/build && mkdir /villas/build
 WORKDIR /villas/build
-RUN cmake .. && \
+RUN --mount=type=cache,id=${DISTRO}-${FEDORA_VERSION}-${ARCH}-${REF},target=/villas/build \
+	cmake .. && \
 	make -j$(nproc) doc && \
 	make -j$(nproc) install && \
 	ldconfig