beta1

Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine
+
+RUN apk add --no-cache curl sqlite
+
+RUN rm /etc/crontabs/root
+RUN mkdir /usr/local/app
+RUN adduser -D -h /usr/local/app backup
+
+
+WORKDIR /usr/local/app
+
+COPY entrypoint.sh backup.sh reload.sh initdb.sql /usr/local/app/
+
+ENV USER=backup
+
+ENTRYPOINT /usr/local/app/entrypoint.sh

backup.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 set -euo pipefail
 
@@ -14,7 +14,7 @@ function extract() {
 		usage "$0 <key>"
 		exit 1
 	fi
-	echo "select $1 from files where id=$id" | sqlite3 db.sqlite
+	echo "select $1 from files where id=$id" | sqlite3 db/db.sqlite
 }
 
 # Extract variables from database

entrypoint.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+set -u
+
+# This script run as root (as crond needs to be root).
+# But the crontab user is different so the work is done by user $USER
+echo "The cronjobs will be run as user '$USER'"
+
+while true ; do
+
+    # Database init if needed
+    if [ ! -e "db/db.sqlite" ] ; then
+	mkdir db
+	touch db/db.sqlite
+	chown "$USER:$USER" db -R
+    	su "$USER" -c "sqlite3 db/db.sqlite" < initdb.sql
+    fi
+
+    cronfile="/etc/crontabs/$USER"
+
+    echo -n '' > "$cronfile"
+    tmp="$(mktemp)"
+    echo 'select id,crontab_time from files' | sqlite3 db/db.sqlite > "$tmp"
+    while read res ; do
+            id="$(echo "$res" | cut -d '|' -f 1)"
+            cron_raw="$(echo "$res" | cut -d '|' -f 2)"
+            # Trim
+            cron_raw="$(echo "$cron_raw" | sed -e 's/^[[:space:]]\+//' -e 's/[[:space:]]\+$//')"
+            # only get valid cron times
+            cron="$(echo "$cron_raw " | grep -oE '^(([[:digit:]]+|\*)[[:space:]]+){3}$')"
+            if [ -z "$cron" ] ; then
+                    echo "Invalid cron times for id=$id : '$cron_raw'"
+                    continue
+            fi
+            echo "$id 5 $cron backup.sh $id" >> "$cronfile"
+
+    done <"$tmp"
+    rm "$tmp"
+
+    # Reglementary empty line at the end
+    echo '' >> "$cronfile"
+
+    # run cron and log
+    date >> /var/log/cron.log
+    crond -L /var/log/cron.log &
+    tail -f /var/log/cron.log
+
+    # Clean
+    killall crond
+
+done

reload.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+killall tail