hassio-addons/auto-snapshot/snapshot.sh

#!/bin/sh

echo
echo "Taking a new snapshot"

CONFIG_PATH=/data/options.json
NUM_SNAPSHOTS=$(jq --raw-output ".num_snapshots" $CONFIG_PATH)
if [ $NUM_SNAPSHOTS -lt 1 ] ; then
    NUM_SNAPSHOTS=1
fi

# retrieve current snapshot list
CURRENT_SNAPSHOTS=$( curl -s -H "X-HASSIO-KEY: $HASSIO_TOKEN" http://hassio/snapshots )
STATUS=$(echo "$CURRENT_SNAPSHOTS" | jq --raw-output '.result')
if [ ! "$STATUS" = "ok" ] ; then
    echo "ERROR: Can't retrieve current snapshot list."
    exit 1
fi


# take snapshot (this can take a long time)
START_TIMESTAMP=$(date "+%s")
RESULT=$( curl -s -H "X-HASSIO-KEY: $HASSIO_TOKEN" --data '{"name":"Automatic Snapshot"}' -X POST http://hassio/snapshots/new/full )
SNAPSHOT_TIMESTAMP=$(date "+%s")
SNAPSHOT_TIME=$(echo "$SNAPSHOT_TIMESTAMP - $START_TIMESTAMP" | bc)

# check if snapshot is ok
STATUS=$(echo "$RESULT" | jq --raw-output '.result')
if [ ! "$STATUS" = "ok" ] ; then
    echo "Snapshot FAILED after $SNAPSHOT_TIME seconds."
    exit 1
fi

SLUG=$(echo "$RESULT" | jq --raw-output '.data.slug')
echo "Snapshot $SLUG taken SUCCESSFULLY in $SNAPSHOT_TIME seconds."

# housekeeping:
# we take the list of snapshots (which was taken before this snapshot)
# we sort by date (reversed), remove the protected snapshots and take
# only a list of slugs
# then we skip the first NUM_SNAPSHOTS slugs and delete all the rest
FIRST_SLUG_TO_DELETE=$(echo "1 + $NUM_SNAPSHOTS" | bc)
echo $CURRENT_SNAPSHOTS | jq --raw-output ".data.snapshots | sort_by(.date) | reverse[] | select(.slug != \"$SLUG\") | select (.protected==false) | .slug " | tail -n +$FIRST_SLUG_TO_DELETE | while read SLUG_TO_DELETE
  do
    echo "Removing snapshot $SLUG_TO_DELETE"
    curl -s -H "X-HASSIO-KEY: $HASSIO_TOKEN"  -X POST http://hassio/snapshots/$SLUG_TO_DELETE/remove
  done