Kindle digital photo frame part 4: downloading pictures from the net + more screensaver problems

Even more problems came to bite me. I had intended to use wget with some options like -r to easily download all the images that I have listed on the front page of my CakePHP backend. However, Kindle's busybox wget is quite primitive; it does not have so many options, and I am forced to perform grep, awk and a lot more scripting to download the pictures that I uploaded. Here's the code:

	lipc-set-prop com.lab126.cmd wirelessEnable 1
	sleep 20
	url=http://insertyourownURLhere.com
	rm index
	# get list of images to download
	wget $url/images/index || error_exit "Cannot download list of images!"
	grep "/img/uploads" index | awk -F\" '{print $2}' > images.txt
	# download all queued images into pics/ folder
	cd pics
	while read line
	do
	wget $url$line
	done < ../images.txt
	# mark all images as downloaded, do not download them again
	wget $url/images/reset
	rm reset
	lipc-set-prop com.lab126.cmd wirelessEnable 0

view raw gistfile1.txt hosted with ❤ by GitHub

In addition, Kindle renames screensavers after restart. All the photos inside the screensavers folder will be renamed to bg_xsmall_ssXX.png. That implies that a maximum of 100 photos are allowed. In addition, if the order of the photos is to be randomized via creating a file called "random", all the photos' filenames will be randomized again upon bootup, meaning I won't be able to tell if /var/local/blanket/screensaver/last_ss points to a photo or downloaded image.

In view of these, I decided to rotate the photos myself by placing one 1 photo inside the screensavers directory: bg_small_ss00.png, and replace that file everytime I change my screensaver. As usual, Busybox is so limited in functionality that I have to go through massive scripting just to choose a random photo or determine a random number. This is my updated screensaver-changing script:

	lipc-set-prop com.lab126.powerd wakeUp 1
	mntroot rw
	sleep 3
	# randomize order of photos
	for f in /mnt/us/photos/*
	do
	newfile=`mktemp -p /mnt/us/photos`
	mv -f $f $newfile
	done
	# if pics are downloaded, then choose between a pic and a photo
	if [ "$(ls -A /mnt/us/pics)" ]
	then
	# 50% probability of displaying pic or photo
	if [ `sed 's/[^[:digit:]]\+//g' < /dev/urandom | head -n 1 | awk '{print substr($0,0,2);}'` -lt 50 ]
	then
	# display a downloaded pic
	echo displaying a downloaded pic
	mv -f "/mnt/us/pics/`ls /mnt/us/pics -1 | head -n 1`" /mnt/us/linkss/screensavers/bg_xsmall_ss00.png
	else
	# display a photo
	echo displaying a photo
	cp "/mnt/us/photos/`ls /mnt/us/photos | sort | head -n 1`" /mnt/us/linkss/screensavers/bg_xsmall_ss00.png
	fi
	else
	# no pics currently, just change to a photo
	cp "/mnt/us/photos/`ls /mnt/us/photos | sort | head -n 1`" /mnt/us/linkss/screensavers/bg_xsmall_ss00.png
	fi
	# show the screensaver
	/usr/bin/powerd_test -p
	# suspend the Kindle in "Ready to suspend" mode indefinitely
	a=0
	while [ $a -lt 50 ]
	do
	lipc-set-prop com.lab126.powerd deferSuspend 86400
	sleep 2
	a=`expr $a + 1`
	done

view raw gistfile1.txt hosted with ❤ by GitHub