API-Docker

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lib/API/Docker/API/Images.pm  view on Meta::CPAN

Server Error> with C<< {"message":"failed to load image: payload does not
match any of the supported image formats: ..."} >>, and the transport's status
handling croaks with an L<API::Docker::Error::HTTP> -- which is that same
string to anything inspecting C<$@> as text -- before any stream is decoded.
Inspect C<$@> as a string rather than testing for the exception class.

The archive is sent as one buffered request body, so loading a large image
costs its full size in RAM.

=head2 commit

    my $result = $images->commit(
        container => $container_id,
        repo      => 'myapp',
        tag       => 'snapshot',
        comment   => 'after the migration ran',
    );
    my $image_id = $result->{Id};

    # With a config override and Dockerfile instructions
    $images->commit(
        container => $container_id,
        repo      => 'myapp',
        tag       => 'v2',
        config    => { Cmd => [ '/bin/sh' ], Labels => { built => 'here' } },
        changes   => [ 'EXPOSE 8080', 'LABEL stage=release' ],
    );

Create an image from a container's current filesystem. This is the one
image-producing path that does not go through a build context, and it is how a
caller snapshots a container it has been exec-ing into.

Returns the raw daemon response, a HashRef with an C<Id> key. Measured against
Podman 5.4.2 (API 1.41) the status is C<201 Created> and C<Id> is a bare hex
digest with no C<sha256:> prefix; Docker prefixes it. Do not compare it
literally against an id from C<inspect> without normalising.

Options:

=over

=item * C<container> - Container id or name to commit (required)

=item * C<repo> - Repository for the new image, e.g. C<myapp>

=item * C<tag> - Tag for the new image

=item * C<comment> - Commit message stored in the image history

=item * C<author> - Author, e.g. C<< Jane <jane@example.com> >>

=item * C<pause> - Pause the container while committing (engine default is true)

=item * C<changes> - Dockerfile instructions to apply to the new image, as a
single string or an ArrayRef of them; an ArrayRef is joined with newlines,
which is what the engine's parser expects

=item * C<config> - HashRef of container configuration to override on the new
image (C<Cmd>, C<Env>, C<Labels>, C<ExposedPorts>, ...), sent as the request
body. Measured against Podman 5.4.2: C<Cmd> replaces the container's, C<Env>
is merged onto the environment the container inherited, and a C<Labels> here
lands alongside a C<LABEL> given in C<changes> -- the two are applied
together, not one instead of the other

=back

=head2 build_prune

    my $result = $images->build_prune(all => 1);
    my $freed  = $result->{SpaceReclaimed};

    # Keep 5 GB of cache
    $images->build_prune(keep_storage => 5 * 1024 * 1024 * 1024);

Clear the BuildKit build cache. B<This is not L</prune>>, and the two are not
interchangeable: L</prune> deletes unused I<images>, this deletes the
intermediate I<build cache> that L</build> writes. Neither touches the other's
storage, and on a machine that builds often the build cache is usually the
larger of the two.

Returns the raw daemon response, a HashRef with C<CachesDeleted> and
C<SpaceReclaimed>.

B<Podman does not implement this endpoint.> Measured against 5.4.2 (API 1.41):
C<POST /build/prune> answers C<404 Not Found> with a C<text/plain> body of
C<Not Found> -- not the JSON C<< {"message":...} >> shape its other errors use
-- at every version prefix tried, and there is no C<libpod> equivalent either.
The transport croaks with C<Docker API error (404): Not Found>, the plain body
verbatim, because it is not JSON to unwrap. A caller that must work on both
engines has to treat that 404 as "no build cache to clear here" rather than as
a transport fault.

Options:

=over

=item * C<keep_storage> - Bytes of cache to keep. Sent as the engine's
C<keep-storage>, which is also accepted as the option name; the underscore
form exists because the hyphenated one has to be quoted in a Perl hash

=item * C<all> - Remove all cache, not just the dangling entries

=item * C<filters> - HashRef of filters, e.g. C<< { until => ['24h'] } >>;
values are ArrayRefs of strings, shape-checked and normalised by
L<API::Docker::Role::Filters>, and passed to the transport unencoded because
it JSON-encodes a HashRef params value itself

=back

=head1 SEE ALSO

=over

=item * L<API::Docker> - Main Docker client

=item * L<API::Docker::Role::Entity::Image> - the convenience methods the
returned objects carry

=item * L<API::Docker::Type::ImageSummary> - the fields C<list> returns

=item * L<API::Docker::Type::ImageInspect> - the fields C<inspect> returns



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