docker-s3-volume-watch/watch

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#!/bin/bash
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[[ "$TRACE" ]] && set -x
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function usage {
cat <<-EOF
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Usage: $PROGNAME [OPTIONS] <local-path> <remote-path>
Sync s3 directory locally and backup changed files on exit
--force-restore restore even if local directory is not empty
eg: $PROGNAME /data s3://bucket/dir
EOF
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}
function error_exit {
echo "${1:-"Unknown Error"}" 1>&2
exit 1
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}
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PARSED_OPTIONS=$(getopt -n "$0" -o f --long "force-restore" -- "$@")
if [ $? -ne 0 ]; then
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exit 1
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fi
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eval set -- "$PARSED_OPTIONS"
while true; do
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case "$1" in
-f|--force-restore)
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FORCE_RESTORE="true"
shift;;
--)
shift
break;;
esac
done
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PROGNAME=$0
LOCAL=$1
REMOTE=$2
function restore {
if [ "$(ls -A $LOCAL)" ]; then
if [[ ${FORCE_RESTORE:false} == 'true' ]]; then
error_exit "local directory is not empty"
fi
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fi
echo "restoring $REMOTE => $LOCAL"
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if ! aws s3 sync "$REMOTE" "$LOCAL"; then
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error_exit "restore failed"
fi
}
function backup {
echo "backup $LOCAL => $REMOTE"
if ! aws s3 sync "$LOCAL" "$REMOTE" --delete; then
echo "backup failed" 1>&2
return 1
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fi
}
function final_backup {
echo "backup $LOCAL => $REMOTE"
while ! aws s3 sync "$LOCAL" "$REMOTE" --delete; do
echo "backup failed, will retry" 1>&2
sleep 1
done
exit 0
}
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function idle {
echo "ready"
while true; do
sleep ${BACKUP_INTERVAL:-42} &
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wait $!
[ -n "$BACKUP_INTERVAL" ] && backup
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done
}
restore
trap final_backup SIGHUP SIGINT SIGTERM
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trap "backup; idle" USR1
idle