support TZ customization

Dockerfile

@@ -13,7 +13,7 @@ WORKDIR /build
 RUN apk add -u git
 RUN \
     if [ -z "$CI" ] ; then \
-    echo "runs outside of CI" && version=$(git log -1 --format=%h)-$(date +%Y%m%dT%H:%M:%S); \
+    echo "runs outside of CI" && version=$(git rev-parse --abbrev-ref HEAD)-$(git log -1 --format=%h)-$(date +%Y%m%dT%H:%M:%S); \
     else version=${GIT_BRANCH}-${GITHUB_SHA:0:7}-$(date +%Y%m%dT%H:%M:%S); fi && \
     echo "version=$version" && \
     cd app && go build -o /build/reproxy -ldflags "-X main.revision=${version} -s -w"
@@ -23,17 +23,20 @@ FROM alpine:3.13
 
 ENV \
     TERM=xterm-color           \
-    TIME_ZONE=America/Chicago
+    TIME_ZONE=UTC
 
 RUN \
-    apk add --no-cache --update tzdata curl ca-certificates && \
+    apk add --no-cache --update tzdata curl ca-certificates dumb-init && \
     cp /usr/share/zoneinfo/${TIME_ZONE} /etc/localtime && \
     echo "${TIME_ZONE}" > /etc/timezone && date && \
+    ln -s /usr/bin/dumb-init /sbin/dinit && \
     rm -rf /var/cache/apk/*
 
+COPY init.sh /init.sh
 COPY --from=backend /build/reproxy /srv/reproxy
 RUN chmod +x /srv/reproxy
 LABEL reproxy.enabled="false"
 WORKDIR /srv
 
-ENTRYPOINT ["/srv/reproxy"]
+ENTRYPOINT ["/init.sh"]
+CMD ["/srv/reproxy"]

examples/docker/docker-compose.yml

@@ -13,6 +13,7 @@ services:
       - DOCKER_ENABLED=true
       - ASSETS_LOCATION=/web
       - DEBUG=true
+      - TIME_ZONE=America/Chicago
 
   svc1:
     image: hashicorp/http-echo

init.sh

@@ -0,0 +1,15 @@
+#!/sbin/dinit /bin/sh
+
+uid=$(id -u)
+
+if [[ ${uid} -eq 0 ]]; then
+    echo "init container"
+
+    # set container's time zone
+    cp /usr/share/zoneinfo/${TIME_ZONE} /etc/localtime
+    echo "${TIME_ZONE}" >/etc/timezone
+    echo "set timezone ${TIME_ZONE} ($(date))"
+fi
+
+echo "execute \"$@\""
+exec $@