skopeo-inspect - Man Page

skopeo inspect [options] image-name

Return low-level information about image-name in a registry. See skopeo(1) for the format of image-name.

The default output includes data from various sources: user input (Name), the remote repository, if any (RepoTags), the top-level manifest (Digest), and a per-architecture/OS image matching the current run-time environment (most other values). To see values for a different architecture/OS, use the --override-os / --override-arch options documented in skopeo(1).

See also skopeo(1) for options placed before the subcommand name.

--authfile path

Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json, which is set using skopeo login. If the authorization state is not found there, $HOME/.docker/config.json is checked, which is set using docker login.

--cert-dir path

Use certificates at path (*.crt, *.cert, *.key) to connect to the registry.

--config

Output configuration in OCI format, default is to format in JSON format.

--creds username[:password]

Username and password for accessing the registry.

--daemon-host host

Use docker daemon host at host (docker-daemon: transport only)

--format,  -f=format

Format the output using the given Go template. The keys of the returned JSON can be used as the values for the --format flag (see examples below). Supports the Go templating functions available at https://pkg.go.dev/github.com/containers/common/pkg/report#hdr-Template_Functions

--help,  -h

Print usage statement

--no-creds

Access the registry anonymously.

--raw

Output raw manifest or config data depending on --config option. The --format option is not supported with --raw option.

--registry-token Bearer token

Registry token for accessing the registry.

--retry-times

The number of times to retry.

--retry-delay

Fixed delay between retries. If not set (or set to 0s), retry wait time will be exponentially increased based on the number of failed attempts.

--shared-blob-dir directory

Directory to use to share blobs across OCI repositories.

--tls-verify=bool

Require HTTPS and verify certificates when talking to the container registry or daemon. Default to registry.conf setting.

--username

The username to access the registry.

--password

The password to access the registry.

--no-tags,  -n

Do not list the available tags from the repository in the output. When true, the RepoTags array will be empty.  Defaults to false, which includes all available tags.

To review information for the image fedora from the docker.io registry:

$ skopeo inspect docker://docker.io/fedora

{
    "Name": "docker.io/library/fedora",
    "Digest": "sha256:f99efcddc4dd6736d8a88cc1ab6722098ec1d77dbf7aed9a7a514fc997ca08e0",
    "RepoTags": [
        "20",
        "21",
        "..."
    ],
    "Created": "2022-11-16T07:26:42.618327645Z",
    "DockerVersion": "20.10.12",
    "Labels": {
        "maintainer": "Clement Verna \u003ccverna@fedoraproject.org\u003e"
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Layers": [
        "sha256:cb8b1ed77979b894115a983f391465651aa7eb3edd036be4b508eea47271eb93"
    ],
    "LayersData": [
        {
            "MIMEType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
            "Digest": "sha256:cb8b1ed77979b894115a983f391465651aa7eb3edd036be4b508eea47271eb93",
            "Size": 65990920,
            "Annotations": null
        }
    ],
    "Env": [
        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
        "DISTTAG=f37container",
        "FGC=f37",
        "FBR=f37"
    ]
}

To inspect python from the docker.io registry and not show the available tags:

$ skopeo inspect --no-tags docker://docker.io/library/python
{
    "Name": "docker.io/library/python",
    "Digest": "sha256:10fc14aa6ae69f69e4c953cffd9b0964843d8c163950491d2138af891377bc1d",
    "RepoTags": [],
    "Created": "2022-11-16T06:55:28.566254104Z",
    "DockerVersion": "20.10.12",
    "Labels": null,
    "Architecture": "amd64",
    "Os": "linux",
    "Layers": [
        "sha256:a8ca11554fce00d9177da2d76307bdc06df7faeb84529755c648ac4886192ed1",
        "sha256:e4e46864aba2e62ba7c75965e4aa33ec856ee1b1074dda6b478101c577b63abd",
        "..."
    ],
    "LayersData": [
        {
            "MIMEType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
            "Digest": "sha256:a8ca11554fce00d9177da2d76307bdc06df7faeb84529755c648ac4886192ed1",
            "Size": 55038615,
            "Annotations": null
        },
        {
            "MIMEType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
            "Digest": "sha256:e4e46864aba2e62ba7c75965e4aa33ec856ee1b1074dda6b478101c577b63abd",
            "Size": 5164893,
            "Annotations": null
        },
        "..."
    ],
    "Env": [
        "PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
        "LANG=C.UTF-8",
        "...",
    ]
}

$ /bin/skopeo inspect --config docker://registry.fedoraproject.org/fedora --format "{{ .Architecture }}"
amd64

$ /bin/skopeo inspect --format '{{ .Env }}' docker://registry.access.redhat.com/ubi8
[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin container=oci]

skopeo(1), skopeo-login(1), docker-login(1), containers-auth.json(5)

Antonio Murdaca runcom@redhat.com ⟨mailto:runcom@redhat.com⟩, Miloslav Trmac mitr@redhat.com ⟨mailto:mitr@redhat.com⟩, Jhon Honce jhonce@redhat.com ⟨mailto:jhonce@redhat.com⟩

containers-transports(5), skopeo(1).