From 8fd4f3d658090f0e9d8859ddbaf5aedbbddac0b0 Mon Sep 17 00:00:00 2001
From: Quentin Gliech <quenting@element.io>
Date: Mon, 8 Aug 2022 16:23:50 +0200
Subject: [PATCH] Disable wasmtime cache in the Docker image

---
 Dockerfile                | 10 ++++++++++
 misc/wasmtime-config.toml |  4 ++++
 2 files changed, 14 insertions(+)
 create mode 100644 misc/wasmtime-config.toml

diff --git a/Dockerfile b/Dockerfile
index d310f5eca..931ac642b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -132,12 +132,22 @@ RUN mv target/$(/docker-arch-to-rust-target.sh "${TARGETPLATFORM}")/release/mas-
 
 ## Runtime stage, debug variant ##
 FROM --platform=${TARGETPLATFORM} gcr.io/distroless/cc-debian${DEBIAN_VERSION}:debug-nonroot AS debug
+
+# Inject a wasmtime config which disables cache to avoid issues running with a read-only root filesystem
+ENV XDG_CONFIG_HOME=/etc
+COPY ./misc/wasmtime-config.toml /etc/wasmtime/config.toml
+
 COPY --from=builder /usr/local/bin/mas-cli /usr/local/bin/mas-cli
 WORKDIR /
 ENTRYPOINT ["/mas-cli"]
 
 ## Runtime stage ##
 FROM --platform=${TARGETPLATFORM} gcr.io/distroless/cc-debian${DEBIAN_VERSION}:nonroot
+
+# Inject a wasmtime config which disables cache to avoid issues running with a read-only root filesystem
+ENV XDG_CONFIG_HOME=/etc
+COPY ./misc/wasmtime-config.toml /etc/wasmtime/config.toml
+
 COPY --from=builder /usr/local/bin/mas-cli /usr/local/bin/mas-cli
 WORKDIR /
 ENTRYPOINT ["/usr/local/bin/mas-cli"]
diff --git a/misc/wasmtime-config.toml b/misc/wasmtime-config.toml
new file mode 100644
index 000000000..d390f110c
--- /dev/null
+++ b/misc/wasmtime-config.toml
@@ -0,0 +1,4 @@
+# Disable wasmtime cache by default in the Docker image, because the rootfs is likely to be read-only
+
+[cache]
+enabled = false