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When `skopeo inspect --raw docker://feodra` is used the returned
manifest content contains a list with manifests for specific
platforms [1] rather than a list with layers.
By using `skopeo inpect docker://fedora` the correct manifest
content is retrieved and a list with layers is provided. In addition,
skopeo handles the difference between schemaVersion 1 and 2.
[1] https://docs.docker.com/registry/spec/manifest-v2-2/#manifest-list-field-descriptions
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Add implementation for virt-builder source which aims to create
container root file system from VM image build with virt-builder.
Usage examples:
$ virt-bootstrap virt-builder://fedora-25 /tmp/foo
$ virt-bootstrap virt-builder://ubuntu-16.04 /tmp/bar --root-password secret
$ virt-bootstrap virt-builder://fedora-25 /tmp/foo -f qcow2 --idmap 0:1000:10
$ sudo virt-bootstrap virt-builder://fedora-25 /tmp/foo --idmap 0:1000:10
Tests are also introduced along with the implementation. They cover
creation of root file system and UID/GID mapping for 'dir' and 'qcow2'
output format by mocking the build_image() method to avoid the time
consuming call to virt-builder which might also require network
connection with function which creates dummy disk image.
Setting root password is handled by virt-builder and hence the
introduced test only ensures that the password string is passed
correctly.
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Use the python bindings of libguestfs to create additional qcow2 image
which has as backing file the last layer (layer-0.qcow2 for FileSource)
and insert hashed value of given root password in the /etc/shadow file.
Note: This additional qcow2 image is also used to apply UID/GID map.
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Apply ownership mapping in qcow2 images using libguestfs python
bindings. To make this solution more general we introduce function
guestfs_walk() which will return the root file system tree of disk
image along with UID/GID values.
These changes are applied in additional qcow2 disk image using the
last layer as backing file. For FileSource this is layer-1.qcow2
with backing file layer-0.qcow2.
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Use the python bindings of libguestfs to create qcow2 image with
backing chains to mimic the layers of container image.
This commit also changes the behavior of FileSource when 'qcow2'
output format is used. Now the string layer-0.qcow2 will be used
as name of the output file.
This change is applied in the test suite as an update to the function
get_image_path().
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The current implementation store in one list:
- checksum
- checksum type
- file path
- file size
However, the information about checksum and checksum type is only used
to verify the content of tarball before it is being extracted. Splitting
these into separate lists would allow us to reuse the function
untar_layers() with FileSource.
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These tests aim to verify the output of virt-bootstrap by creating tar
archives which contain dummy root file system and call the function
bootstrap(). The check the extracted root file system.
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Unit tests were used to ensure that functions and methods work as
expected. However, these tests are closely related to the
implementation and will result in major changes after some refactoring.
To reduce the amount of work needed to add new features or changes to
the code most of these tests will be replaced with more abstract form
of testing introduced in the following commits.
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Improve readability by spliting the 'sources' module into separate
files. Each file contains only one class.
In addition update the mock statements in the unit tests to match these
changes.
Add recursive-include in MANIFEST.in to include virtBootstrap.sources
module.
Update the unit tests to match these changes.
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Reduce the number of import statements and improve readability.
Update the unit tests to match these changes.
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