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