maemo.org - Talk - Picasa image sync

I hate keeping files in sync. I much prefer it happen automagically. So I have created a script to download my picasa albums automatically. This is the first step in creating a full application, but I figured I would share it in case other developers find it useful or inspiring. It's not shabby for a few hours of hacking. The gdata stuff is really quite slick.

You will need the python2.5-runtime and python-gdata to run this.

Code:

#!/usr/bin/python2.5

import sys

import os

import urllib2



# Try importing it from the system and then from the named subdir

try:

        import gdata.photos.service

        import gdata.media

        import gdata.geo

except:

        sys.path.append('gdata.py-1.1.0/src')

        import gdata.photos.service

        import gdata.media

        import gdata.geo





gd_client = gdata.photos.service.PhotosService()



def sync ( username, prefix, limit = None ):

        prefix = os.path.join(prefix, username)

        if not os.path.isdir(prefix):

                print "Creating directory %s" % (prefix)

                os.makedirs(prefix)

        

        album_list = gd_client.GetUserFeed(user = username, limit = limit)

        for album in reversed(album_list.entry):

                sync_album(album, prefix)

        



def sync_album ( album, prefix ):

        album_dir = os.path.join(prefix, album.name.text);

        if not os.path.isdir(album_dir):

                print "Creating directory %s" % (album_dir)

                os.makedirs(album_dir)



        current_dir = set(os.listdir(album_dir))

        new_files = []



        photos = gd_client.GetFeed(album.GetPhotosUri())

        for photo in photos.entry:

                if not os.path.exists(os.path.join(album_dir, photo.title.text)):

                        print "Downloading: %s -> %s" % (photo.content.src, os.path.join(album_dir, photo.title.text) )

                        download(photo.content.src, os.path.join(album_dir, photo.title.text))

                new_files.append(photo.title.text)



        unlink = current_dir - set(new_files)

        for name in unlink:

                print "Deleting unused file %s" % (os.path.join(album_dir,name))

                os.remove(os.path.join(album_dir,name))



def download ( url, destination ):

        out = open(destination, 'w')

        out.write(urllib2.urlopen(url).read())

To execute a sync. The first argument is the picasa username, the second is the path where you want it to store the files, and the third is how many recent albums to take ( left blank = all ).

Code:

~ $ python2.5 -i PicSync.py 

>>> sync('ericewarnke','/media/mmc1/Photos/',1)

Creating directory /media/mmc1/Photos/ericewarnke

Creating directory /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ

Downloading: http://lh4.ggpht.com/ericewarnke/SEylJSZCv5I/AAAAAAAACF0/qNqPfjVNSrQ/20080608-CRW_0811.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0811.jpg

Downloading: http://lh3.ggpht.com/ericewarnke/SEylLKRiLpI/AAAAAAAACF4/I-KKY8Cj3co/20080608-CRW_0813.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0813.jpg

Downloading: http://lh6.ggpht.com/ericewarnke/SEylNPbZVmI/AAAAAAAACF8/ypo8b0Wj2gw/20080608-CRW_0821.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0821.jpg

Downloading: http://lh4.ggpht.com/ericewarnke/SEylPCvHQpI/AAAAAAAACGA/1KJU8aLqh0w/20080608-CRW_0823.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0823.jpg

Downloading: http://lh5.ggpht.com/ericewarnke/SEylRVDHCZI/AAAAAAAACGE/Y5-ECNzhYE0/20080608-CRW_0826.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0826.jpg

Downloading: http://lh3.ggpht.com/ericewarnke/SEylS9oDQXI/AAAAAAAACGI/p4KVric6Cio/20080608-CRW_0834.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0834.jpg

Downloading: http://lh4.ggpht.com/ericewarnke/SEylVFBDeOI/AAAAAAAACGQ/_1pzf9TLR0c/20080608-CRW_0840.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0840.jpg

Downloading: http://lh4.ggpht.com/ericewarnke/SEylXB6_lII/AAAAAAAACGU/91F6rY3zG0k/20080608-CRW_0845.jpg -> /media/mmc1/Photos/ericewarnke/GraftonLakesBBQ/20080608-CRW_0845.jpg

I'm planning on developing this into a full fledged background daemon that gets kicked off via cron, checks for updates and downloads them. It can't do private albums right now, pre-resized images, or many other tricks but they are all on my list.