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Copyright © 2014-2015 Matt Bogosian (@posita).

Please see the accompanying LICENSE (or LICENSE.txt) file for rights and restrictions governing use of this software. All rights not expressly waived or licensed are reserved. If such a file did not accompany this software, then please contact the author before viewing or using this software in any capacity.

Curious about integrating your project with the above services? Jeff Knupp (@jeffknupp) describes how.

dimgx - Docker IMaGe layer eXtractor (and flattener)

dimgx extracts and flattens Docker image layers. It is licensed under the MIT License. Source code is available on GitHub. See the docs for more information.

Examples

% dimgx -h
usage:
dimgx [options] [-l LAYER_SPEC] ... [-t PATH] IMAGE_SPEC
dimgx -h # for help

Docker IMaGe layer eXtractor (and flattener)
...

% dimgx nifty-box # show layers for "nifty-box[:latest]"
REPO TAG                IMAGE ID        PARENT ID       CREATED         LAYER SIZE      VIRTUAL SIZE
nifty-box               6667bbd4093c    82e5dcafc08c    18 hours ago    18.8 MB         144.0 MB
-                       82e5dcafc08c    cd5e80677a53    18 hours ago    1.8 kB          125.2 MB
-                       cd5e80677a53    df2a0347c9d0    18 hours ago    0 Bytes         125.2 MB
debian:jessie           df2a0347c9d0    39bb80489af7    21 hours ago    0 Bytes         125.2 MB
-                       39bb80489af7    -               21 hours ago    125.2 MB        125.2 MB

% dimgx -l df2a:82ef nifty-box # show only the second through fourth layers
IMAGE TAG               IMAGE ID        PARENT ID       CREATED         LAYER SIZE      VIRTUAL SIZE
-                       82e5dcafc08c    cd5e80677a53    18 hours ago    1.8 kB          125.2 MB
-                       cd5e80677a53    df2a0347c9d0    18 hours ago    0 Bytes         125.2 MB
debian:jessie           df2a0347c9d0    39bb80489af7    21 hours ago    0 Bytes         125.2 MB

% dimgx -l cd5e:6667 -t nifty.tar nifty-box # extract the third through fifth layers
% du -hs nifty.tar
 18M    nifty.tar

Issues

dimgx does what I want, so I'm just maintaining it at this point. If you find a bug, or want a feature, please file an issue (if it hasn't already been filed). If you're willing and able, consider contributing.