rm

Dockerfile

@@ -1,19 +1,22 @@
-FROM ubuntu:18.10 as builder
-RUN apt -y update \
-   && apt -y install gcc
+FROM ubuntu:18.04 as builder
+RUN apt -y update || true; apt -y install gcc
 COPY ./pause /pause
 RUN cd /pause && gcc ./main.c -o pauser
 
-FROM ubuntu:18.10
+FROM ubuntu:18.04
 RUN groupadd postgres && useradd -d /home/postgres -ms /bin/bash -g postgres -G sudo postgres
-RUN apt -y update \
-   && apt -y install \
+RUN export DEBIAN_FRONTEND=noninteractive; \
+   apt -y update || true;  \
+   apt -y install tzdata; \
+   ln -fs /usr/share/zoneinfo/America/Denver /etc/localtime; \
+   dpkg-reconfigure --frontend noninteractive tzdata; \
+   apt -y install \
       curl \
       rsync \
       cron \
       postgresql postgresql-contrib \
    && curl -L \
-      https://github.com/miniflux/miniflux/releases/download/2.0.19/miniflux_2.0.19_amd64.deb \
+      https://github.com/miniflux/miniflux/releases/download/2.0.36/miniflux_2.0.36_amd64.deb \
       > /miniflux.deb \
    && dpkg -i /miniflux.deb \
    && mkdir -p /mnt/save
@@ -36,22 +39,16 @@ ENV RUN_MIGRATIONS=0
 ENV CREATE_ADMIN=0
 
 COPY --from=builder /pause/pauser /pauser
+COPY backup.sh /
+COPY restore.sh /
+COPY entrypoint.sh /
 
 USER root
 ### CRON BACKUPS
 RUN true \
-   && echo 'service postgresql stop && sleep 5 && b=$(date +%Y%m%d%H) && mkdir -p /mnt/save/$b && rsync -avzP --delete /var/lib/postgresql/10/main/ /mnt/save/$b/ && service postgresql start' > /backup.sh \
-   && echo 'service postgresql stop && sleep 5 && b=$(find /mnt/save -mindepth 1 -maxdepth 1 | sort | tail -n 1); if [ -n "$b" ]; then rsync -avzP --delete "${b%/}/" /var/lib/postgresql/10/main/; fi && chown -R postgres /var/lib/postgresql && chmod -R 0700 /var/lib/postgresql && service postgresql start;' > /restore.sh \
    && echo '0 4,8,12,16,20 * * * bash /backup.sh >> /var/log/cronj.log 2>&1' > /etc/cron.d/backups \
    && echo '' >> /etc/cron.d/backups \
    && chmod 0644 /etc/cron.d/backups \
    && touch /var/log/cronj.log
 
-ENTRYPOINT \
-   bash /restore.sh \
-   && service postgresql start \
-   && sleep 10 \
-   && miniflux -migrate \
-   && miniflux -create-admin \
-   && miniflux \
-   & exec /pauser
+ENTRYPOINT bash /entrypoint.sh

backup.sh

@@ -0,0 +1,16 @@
+b=$(date +%Y%m%d%H%M%S)
+mkdir -p /mnt/save/$b
+(
+   set -e
+   pg_dump $DATABASE_URL --clean > /mnt/save/$b/.pg.dump
+   mv /mnt/save/$b/{.,""}pg.dump
+) \
+   || (
+      rm -rf /mnt/save/$b
+      echo "backup failed; deleting $b"
+      exit 1
+   )
+if du -sh /mnt/save/$b | grep -Ei "^[ ]*(4|2.).0K"; then
+   rm -rf /mnt/save/$b
+   echo rm empty backup $b
+fi

entrypoint.sh

@@ -0,0 +1,38 @@
+#! /bin/bash
+
+LOG=/tmp/bel.log
+
+main() {
+   echo "" > $LOG
+
+   ensure start_postgres
+   until psql $DATABASE_URL < /dev/null; do sleep 5; done
+
+   bash /restore.sh
+
+   miniflux -migrate
+   miniflux -create-admin
+   ensure miniflux
+
+   exec /pauser
+}
+
+start_postgres() {
+   service postgresql start
+   psql $DATABASE_URL
+}
+
+ensure() {
+   _ensure "$@" &>> $LOG & disown
+}
+
+_ensure() {
+   while true; do
+      echo $(date): ensuring "$@" >&2
+      "$@"
+      sleep 3
+   done
+}
+
+main "$@"
+

pause/main.c

@@ -14,7 +14,7 @@ int main() {
    printf("Waiting...\n");
    stat = sigwait(&set, &sig);
    printf("Wait complete: %i (%i)\n", sig, stat);
-   printf("Stopped postgres: %i\n", system("service postgresql stop && sleep 5"));
    printf("Saved postgres: %i\n", system("bash /backup.sh"));
+   printf("Bye-bye!\n");
    return 0;
 }

restore.sh

@@ -0,0 +1,23 @@
+all_backups=($(find /mnt/save -not -path '*/\.*' -type f | sort -r))
+for ((i=${#all_backups[@]}-1; i>50; i--)); do
+   echo rm old backpu ${all_backups[i]} >&2
+   rm -f ${all_backups[i]}  || true
+done
+
+for b in "${all_backups[@]}"; do
+   if [ -n "$b" ]; then
+      du -sh "$b"
+      if ! du -sh "$b" | grep -Ei "^[ \t]*[0-9][0-9]*[0-9]?(.0)?[mg]"; then
+         echo would rm empty backup $b >&2
+         set -x
+         mv "$b" "${b%/*}/.${b##*/}"
+         set +x
+         continue
+      fi
+      echo restoring $b >&2
+      if psql $DATABASE_URL < "$b"; then
+         break
+      fi
+   fi
+done
+service postgresql start