Python: Updates Subversion, Git, Mercurial and Bazaar repositories recursive

update_latest_revisions.py

#!/usr/bin/python
import os
import os.path
from subprocess import call

if __name__ == "__main__":
    apps_dir = os.path.abspath('.')
    for app_name in os.listdir(apps_dir):
        app_dir = os.path.abspath(os.path.join(apps_dir, app_name))
        git_path = os.path.join(app_dir, '.git')
        svn_path = os.path.join(app_dir, '.svn')
        hg_path = os.path.join(app_dir, '.hg')
        bzr_path = os.path.join(app_dir, '.bzr')
        if os.path.lexists(svn_path):
            print ""
            print "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
            print ""
            print "Updating Subversion %s" % app_dir
            os.chdir(app_dir)
            call(['svn', 'update'])
        elif os.path.lexists(git_path):
            print ""
            print "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
            print ""
            print "Updating Git %s" % app_dir
            os.chdir(app_dir)
            call(['git', 'pull'])
        elif os.path.lexists(hg_path):
            print ""
            print "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
            print ""
            print "Updating Mercurial %s" % app_dir
            os.chdir(app_dir)
            call(['hg', 'fetch'])
        elif os.path.lexists(bzr_path):
            print ""
            print "* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *"
            print ""
            print "Updating Bazaar %s" % app_dir
            os.chdir(app_dir)
            call(['bzr', 'pull'])
        else:
            continue