Struct ImageManifest

pub struct ImageManifest { /* private fields */ }

Unlike the image index, which contains information about a set of images that can span a variety of architectures and operating systems, an image manifest provides a configuration and set of layers for a single container image for a specific architecture and operating system.

Implementations

impl ImageManifest

pub fn schema_version(&self) -> u32

This REQUIRED property specifies the image manifest schema version. For this version of the specification, this MUST be 2 to ensure backward compatibility with older versions of Docker. The value of this field will not change. This field MAY be removed in a future version of the specification.

impl ImageManifest

pub fn media_type(&self) -> &Option<MediaType>

This property is reserved for use, to maintain compatibility. When used, this field contains the media type of this document, which differs from the descriptor use of mediaType.

pub fn artifact_type(&self) -> &Option<MediaType>

This OPTIONAL property contains the type of an artifact when the manifest is used for an artifact. This MUST be set when config.mediaType is set to the empty value. If defined, the value MUST comply with RFC 6838, including the naming requirements in its section 4.2, and MAY be registered with IANA. Implementations storing or copying image manifests MUST NOT error on encountering an artifactType that is unknown to the implementation.

pub fn config(&self) -> &Descriptor

This REQUIRED property references a configuration object for a container, by digest. Beyond the descriptor requirements, the value has the following additional restrictions: The media type descriptor property has additional restrictions for config. Implementations MUST support at least the following media types:

• application/vnd.oci.image.config.v1+json

Manifests concerned with portability SHOULD use one of the above media types.

pub fn layers(&self) -> &Vec<Descriptor>

Each item in the array MUST be a descriptor. The array MUST have the base layer at index 0. Subsequent layers MUST then follow in stack order (i.e. from layers[0] to layers[len(layers)-1]). The final filesystem layout MUST match the result of applying the layers to an empty directory. The ownership, mode, and other attributes of the initial empty directory are unspecified.

pub fn subject(&self) -> &Option<Descriptor>

This OPTIONAL property specifies a descriptor of another manifest. This value, used by the referrers API, indicates a relationship to the specified manifest.

pub fn annotations(&self) -> &Option<HashMap<String, String>>

This OPTIONAL property contains arbitrary metadata for the image manifest. This OPTIONAL property MUST use the annotation rules.

impl ImageManifest

pub fn layers_mut(&mut self) -> &mut Vec<Descriptor>

Each item in the array MUST be a descriptor. The array MUST have the base layer at index 0. Subsequent layers MUST then follow in stack order (i.e. from layers[0] to layers[len(layers)-1]). The final filesystem layout MUST match the result of applying the layers to an empty directory. The ownership, mode, and other attributes of the initial empty directory are unspecified.

pub fn annotations_mut(&mut self) -> &mut Option<HashMap<String, String>>

This OPTIONAL property contains arbitrary metadata for the image manifest. This OPTIONAL property MUST use the annotation rules.

impl ImageManifest

pub fn set_schema_version(&mut self, val: u32) -> &mut Self

This REQUIRED property specifies the image manifest schema version. For this version of the specification, this MUST be 2 to ensure backward compatibility with older versions of Docker. The value of this field will not change. This field MAY be removed in a future version of the specification.

pub fn set_media_type(&mut self, val: Option<MediaType>) -> &mut Self

This property is reserved for use, to maintain compatibility. When used, this field contains the media type of this document, which differs from the descriptor use of mediaType.

pub fn set_artifact_type(&mut self, val: Option<MediaType>) -> &mut Self

This OPTIONAL property contains the type of an artifact when the manifest is used for an artifact. This MUST be set when config.mediaType is set to the empty value. If defined, the value MUST comply with RFC 6838, including the naming requirements in its section 4.2, and MAY be registered with IANA. Implementations storing or copying image manifests MUST NOT error on encountering an artifactType that is unknown to the implementation.

pub fn set_config(&mut self, val: Descriptor) -> &mut Self

This REQUIRED property references a configuration object for a container, by digest. Beyond the descriptor requirements, the value has the following additional restrictions: The media type descriptor property has additional restrictions for config. Implementations MUST support at least the following media types:

• application/vnd.oci.image.config.v1+json

Manifests concerned with portability SHOULD use one of the above media types.

pub fn set_layers(&mut self, val: Vec<Descriptor>) -> &mut Self

Each item in the array MUST be a descriptor. The array MUST have the base layer at index 0. Subsequent layers MUST then follow in stack order (i.e. from layers[0] to layers[len(layers)-1]). The final filesystem layout MUST match the result of applying the layers to an empty directory. The ownership, mode, and other attributes of the initial empty directory are unspecified.

pub fn set_subject(&mut self, val: Option<Descriptor>) -> &mut Self

This OPTIONAL property specifies a descriptor of another manifest. This value, used by the referrers API, indicates a relationship to the specified manifest.

pub fn set_annotations( &mut self, val: Option<HashMap<String, String>>, ) -> &mut Self

This OPTIONAL property contains arbitrary metadata for the image manifest. This OPTIONAL property MUST use the annotation rules.

impl ImageManifest

pub fn from_file<P: AsRef<Path>>(path: P) -> Result<ImageManifest>

Attempts to load an image manifest from a file.

Errors

This function will return an OciSpecError::Io if the file does not exist or an OciSpecError::SerDe if the image manifest cannot be deserialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();

pub fn from_reader<R: Read>(reader: R) -> Result<ImageManifest>

Attempts to load an image manifest from a stream.

Errors

This function will return an OciSpecError::SerDe if the manifest cannot be deserialized.

Example

use oci_spec::image::ImageManifest;
use std::fs::File;

let reader = File::open("manifest.json").unwrap();
let image_manifest = ImageManifest::from_reader(reader).unwrap();

pub fn to_file<P: AsRef<Path>>(&self, path: P) -> Result<()>

Attempts to write an image manifest to a file as JSON. If the file already exists, it will be overwritten.

Errors

This function will return an OciSpecError::SerDe if the image manifest cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
image_manifest.to_file("my-manifest.json").unwrap();

pub fn to_file_pretty<P: AsRef<Path>>(&self, path: P) -> Result<()>

Attempts to write an image manifest to a file as pretty printed JSON. If the file already exists, it will be overwritten.

Errors

This function will return an OciSpecError::SerDe if the image manifest cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
image_manifest.to_file_pretty("my-manifest.json").unwrap();

pub fn to_writer<W: Write>(&self, writer: &mut W) -> Result<()>

Attempts to write an image manifest to a stream as JSON.

Errors

This function will return an OciSpecError::SerDe if the image manifest cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
let mut writer = Vec::new();
image_manifest.to_writer(&mut writer);

pub fn to_writer_pretty<W: Write>(&self, writer: &mut W) -> Result<()>

Attempts to write an image manifest to a stream as pretty printed JSON.

Errors

This function will return an OciSpecError::SerDe if the image manifest cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
let mut writer = Vec::new();
image_manifest.to_writer_pretty(&mut writer);

pub fn to_string(&self) -> Result<String>

Attempts to write an image manifest to a string as JSON.

Errors

This function will return an OciSpecError::SerDe if the image configuration cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
let json_str = image_manifest.to_string().unwrap();

pub fn to_string_pretty(&self) -> Result<String>

Attempts to write an image manifest to a string as pretty printed JSON.

Errors

This function will return an OciSpecError::SerDe if the image configuration cannot be serialized.

Example

use oci_spec::image::ImageManifest;

let image_manifest = ImageManifest::from_file("manifest.json").unwrap();
let json_str = image_manifest.to_string_pretty().unwrap();

Trait Implementations

impl Clone for ImageManifest

fn clone(&self) -> ImageManifest

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ImageManifest

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ImageManifest

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ImageManifest

This ToString trait is automatically implemented for any type which implements the Display trait. As such, ToString shouldn’t be implemented directly: Display should be implemented instead, and you get the ToString implementation for free.

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for ImageManifest

fn eq(&self, other: &ImageManifest) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ImageManifest

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for ImageManifest

impl StructuralPartialEq for ImageManifest