| get_version() { |
| sed -En 's/^ *"?rncn-config-version"? *: *([0-9]+),?$/\1/p' |
| } |
| |
| # Usage: check_and_update_config <remote-url> <local-path> [<service-name>] |
| check_and_update_config() { |
| local cfg remote_version local_version |
| cfg="`wget --no-verbose \"$1\" -O -`" || return |
| remote_version="`printf '%s\\n' "$cfg" | get_version`" |
| if [ -z "$remote_version" ]; then |
| echo "Newly fetched configuration file has no version field?!" 1>&2 |
| return 1 |
| fi |
| if [ -f "$2" ]; then |
| local_version="`get_version < \"$2\"`" |
| [ -n "$local_version" ] && [ "$local_version" -ge "$remote_version" ] && return |
| fi |
| rm -f "$2.old" |
| printf %s\\n "$cfg" > "$2" |
| [ $# = 2 ] && return |
| if ! service "$3" restart; then |
| printf "Failed to restart %s, rollback to old version\\n" "$2" |
| mv "$2.old" "$2" |
| service "$3" restart |
| return |
| fi |
| echo "Newer configuration has been found and updated." 1>&2 |
| } |