7.9. Getting UBI container image source code

Procedure

1. Use the skopeo copy command to copy the source container image to a local directory:

   $ skopeo copy \
   docker://registry.access.redhat.com/ubi10:8.1-397-source \
   dir:$HOME/TEST
   ...
   Copying blob 477bc8106765 done
   Copying blob c438818481d3 done
   ...
   Writing manifest to image destination
   Storing signatures

2. Use the skopeo inspect command to inspect the source container image:

   $ skopeo inspect dir:$HOME/TEST
   {
       "Digest": "sha256:7ab721ef3305271bbb629a6db065c59bbeb87bc53e7cbf88e2953a1217ba7322",
       "RepoTags": [],
       "Created": "2020-02-11T12:14:18.612461174Z",
       "DockerVersion": "",
       "Labels": null,
       "Architecture": "amd64",
       "Os": "linux",
       "Layers": [
           "sha256:1ae73d938ab9f11718d0f6a4148eb07d38ac1c0a70b1d03e751de8bf3c2c87fa",
           "sha256:9fe966885cb8712c47efe5ecc2eaa0797a0d5ffb8b119c4bd4b400cc9e255421",
           "sha256:61b2527a4b836a4efbb82dfd449c0556c0f769570a6c02e112f88f8bbcd90166",
           ...
           "sha256:cc56c782b513e2bdd2cc2af77b69e13df4ab624ddb856c4d086206b46b9b9e5f",
           "sha256:dcf9396fdada4e6c1ce667b306b7f08a83c9e6b39d0955c481b8ea5b2a465b32",
           "sha256:feb6d2ae252402ea6a6fca8a158a7d32c7e4572db0e6e5a5eab15d4e0777951e"
       ],
       "Env": null
   }

3. Unpack all the content:

   $ cd $HOME/TEST
   $ for f in $(ls); do tar xvf $f; done

4. Check the results:

   $ find blobs/ rpm_dir/
   blobs/
   blobs/sha256
   blobs/sha256/10914f1fff060ce31388f5ab963871870535aaaa551629f5ad182384d60fdf82
   rpm_dir/
   rpm_dir/gzip-1.9-4.el8.src.rpm

   If the results are correct, the image is ready to be used.

   注意

   It could take several hours after a container image is released for its associated source container to become available.

   For more information, see the skopeo-copy (1) and skopeo-inspect(1) man pages on your system.