#!/bin/bash
#
# Written by Aaron Bockover <abockover@novell.com>
# Made available under the MIT/X11 license
#
# This script recursively fixes up the mtime of 
# a directory to the same time as the last modified
# file in that directory

# Function to copy the atime,mtime 
# from source ($1) to dest ($2)
function copytime () {

	[[ -e "$1" && -e "$2" ]] || {
		echo "Could not stat one of '$1' or '$2'" 1>&2
		exit 1
	}

	echo "$1 -> $2"

	prog=$(echo "
		import sys; import os;
		from stat import ST_ATIME, ST_MTIME;
		stat = os.stat (sys.argv[1]);
		os.utime (sys.argv[2], (stat[ST_ATIME], stat[ST_MTIME]));
	" | tr -d '\n' | tr -d '\t')

	python -c "$prog" "$1" "$2" || {
		echo "Could not update time of '$2'" 1>&2
		exit 1
	}
}

# find the directories we'll want to modify
for dir in $(find -type d -mindepth 0 | sort -r); do
	
	# find the oldest immediate child of this directory
	oldest=$(find $dir \
		\( -type f -o -type d \) \
		-mindepth 1 -maxdepth 1 \
		-exec stat -c"%Y %n" {} \; \
			| sort -nr | head -n1 | cut -f2 -d' ')
	
	copytime "$oldest" "$dir"

done