Install litestream in the container image

Dockerfile

@@ -4,6 +4,12 @@ RUN cd /src && \
     go build -ldflags="-extldflags=-static" -tags "sqlite_omit_load_extension netgo" -o tabacco ./cmd/tabacco && \
     strip tabacco
 
+FROM debian:stable-slim AS litestream-dl
+ENV LITESTREAM_VERSION=0.3.6
+ADD https://github.com/benbjohnson/litestream/releases/download/v${LITESTREAM_VERSION}/litestream-v${LITESTREAM_VERSION}-linux-amd64-static.tar.gz /tmp/
+RUN tar -C /usr/bin -xzv -f /tmp/litestream-v${LITESTREAM_VERSION}-linux-amd64-static.tar.gz && chmod 755 /usr/bin/litestream
+
 FROM registry.git.autistici.org/ai3/docker/s6-base:master
 COPY --from=build /src/tabacco /usr/bin/tabacco
+COPY --from=litestream-dl /usr/bin/litestream /usr/bin/litestream
 COPY metadb/docker/etc/ /etc/

metadb/docker/etc/cont-init.d/10litestream

@@ -5,6 +5,10 @@ if [ -n "${LITESTREAM_URL}" ]; then
 
     # Query the tabacco configuration to obtain the database path.
     db_path=$(tabacco metadb-config --config=${TABACCO_CONF:-/etc/tabacco/metadb.yml} db-uri)
+    if [ -z "${db_path}" ]; then
+        echo "Error reading db-uri from tabacco" >&2
+        exit 1
+    fi
 
     if [ ! -e "${db_path}" ]; then
         echo "Database is missing, attempting restore..." >&2

metadb/docker/etc/services.d/litestream/run

 #!/bin/sh
 
 db_path=$(tabacco metadb-config --config=${TABACCO_CONF:-/etc/tabacco/metadb.yml} db-uri)
+if [ -z "${db_path}" ]; then
+    echo "Error reading db-uri from tabacco" >&2
+    sleep 3
+    exit 1
+fi
 
 exec litestream replicate "${db_path}" "${LITESTREAM_URL}"