commit b39cea622ad23a149127f803b82868c0a4001b45
Author: Christian Wolf <git@christianwolf.email>
Date:   Thu May 9 13:38:21 2024 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c05e777
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+repos
diff --git a/bup-sync-trigger.sh b/bup-sync-trigger.sh
new file mode 100755
index 0000000..8730e19
--- /dev/null
+++ b/bup-sync-trigger.sh
@@ -0,0 +1,124 @@
+#!/bin/bash -e
+
+# Parse CLI and set options
+repoFile="$(dirname "$0")/repos"
+dryRun=''
+
+varDir=/var/lib/bup-backup-trigger
+triggerFile="$varDir/trigger"
+lockFile="$varDir/lock"
+log="/var/log/bup-sync.log"
+
+mkdir -p "$varDir"
+
+while [ $# -gt 0 ]
+do
+    case "$1" in
+        --repos|-r)
+            repoFile="$2"
+            shift
+            ;;
+        --dry|--dry-run|-d)
+            dryRun=y
+            ;;
+        --lock)
+            touch "$lockFile"
+            exit 0
+            ;;
+        --unlock)
+            rm -f "$lockFile"
+            exit 0
+            ;;
+        --log)
+            log="$2"
+            shift
+            ;;
+        *)
+            echo "Cannot understand parameter \"$1\". Aborting." >&2
+            exit 1
+            ;;
+    esac
+    shift
+done
+
+if [ "$log" != '-' ]
+then
+    exec >> "$log"
+fi
+
+# Do some safety checks
+
+if [ ! -r "$repoFile" ]
+then
+    echo "Cannot read the file $repoFile. Exiting" >&2
+    exit 1
+fi
+
+if [ -f "$lockFile" ]
+then
+    echo "The lock file exists. Skipping for now ($(date))"
+    exit 0
+fi
+
+# Define the needed functions
+
+getNextDate() {
+    python << EOF
+import datetime
+
+now = datetime.date.today()
+weekday = now.weekday()
+oneDay = datetime.timedelta(days=1)
+mondayThisWeek = now - oneDay * weekday
+mondayNextWeek = mondayThisWeek + oneDay * 7
+dt = datetime.datetime.fromisoformat(mondayNextWeek.isoformat())
+dt = dt.replace(hour=4, minute=45)
+print(int(dt.astimezone(datetime.timezone.utc).timestamp()))
+EOF
+}
+
+updateTriggerFile() {
+    getNextDate > "$triggerFile"
+}
+
+triggerLiesInPast() {
+    if [ ! -f "$triggerFile" ]
+    then
+        return 0
+    fi
+
+    local now=$(date +%s)
+    local triggered=$(cat "$triggerFile")
+    if [ $now -gt "$triggered" ]
+    then
+        return 0
+    else
+        return 1
+    fi
+}
+
+if ! triggerLiesInPast
+then
+    echo "The timestamp in the trigger event lies in the future. Waiting further."
+    exit 0
+fi
+
+echo "The backup script is triggered."
+
+while read line
+do
+    echo "Processing line $line"
+    if [ -n "$dryRun" ]
+    then
+        echo "Shipping to call script $line as in dry mode."
+    else
+        $line
+    fi
+done <<< $(cat "$repoFile" | grep -v '^#' | sed '/^\W*$/d')
+
+if [ -n "$dryRun" ]
+then
+    echo "Not updating the trigger timestamp. The value would be $(getNextDate)."
+else
+    updateTriggerFile
+fi
diff --git a/repos.dist b/repos.dist
new file mode 100644
index 0000000..7b166b3
--- /dev/null
+++ b/repos.dist
@@ -0,0 +1,4 @@
+# This is a list of all scripts to synchronize the backups
+# An example would be:
+/backup/server/sync.sh
+/backup/cloud/sync.sh