Downloading http://pkg.jenkins-ci.org/debian-stable/binary/InRelease...
Downloading http://pkg.jenkins-ci.org/debian-stable/binary/Release...
Downloading http://pkg.jenkins-ci.org/debian-stable/binary/Release.gpg...
gpgv:  DSA key ID D50582E6
gpgv: Good signature from "Kohsuke Kawaguchi <kk@kohsuke.org>"
gpgv:                 aka "Kohsuke Kawaguchi <kohsuke.kawaguchi@sun.com>"
gpgv:                 aka "[invalid image]"

Mirror [mirror21]: http://pkg.jenkins-ci.org/debian-stable/ ./binary/ successfully added.
You can run 'aptly mirror update mirror21' to download repository contents.