How to get information from ghcr Docker Registry HTTP API V2 with curl

ghcr.sh

#!/usr/bin/env bash
# ref: https://git.521000.bestmunity/t/how-to-check-if-a-container-image-exists-on-ghcr/154836/3

# public image's {USER}/{IMAGE}
USER_IMAGE=eggplants/asciiquarium-docker

# get token ('{"token":"***"}' -> '***')
TOKEN="$(
  curl "https://ghcr.io/token?scope=repository:${USER_IMAGE}:pull" |
  awk -F'"' '$0=$4'
)"

_curl(){ curl -H "Authorization: Bearer ${TOKEN}" "$1" }

# get tags
_curl "https://ghcr.io/v2/${USER_IMAGE}/tags/list"

# get manifest of the latest image
_curl "https://ghcr.io/v2/${USER_IMAGE}/manifests/latest"

manifest.json

{
   "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
   "schemaVersion": 2,
   "config": {
      "mediaType": "application/vnd.docker.container.image.v1+json",
      "digest": "sha256:fb4552eacdc8e01082f87bae6a0fec6e1b61630f0a1e5a0e6a699d05ff0337fd",
      "size": 5551
   },
   "layers": [
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:4be315f6562fccf08fd6c749557e31e45ab6d987370e20e2c4933ddb04ddd5ff",
         "size": 27140664
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:f6722131500bb303e9a66464a1d7a3805efaa2db3715d5204f5bdb89656a0589",
         "size": 200
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:ac65630ca76f500df10c4676ec0fe8623070f1ab3394b8c2f4c6db4a48ebfa6c",
         "size": 14894913
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:380348d1c396f3eb3c542ccc62b73383297b6a48b625f9671f59c109d964954e",
         "size": 43915124
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:49470ea4d7663bcafd377eeeeda4d15445b09043f2dbf7d5f2865a66fbadcc44",
         "size": 604613
      }
   ]
}

tags.json

{"name":"eggplants/asciiquarium-docker","tags":["0.0.0","0.0","latest"]}

Didn't know how to extract info from the ghcr registry, your script is a good documentation, thanks!

@mtovmassian If you are pythonista, it could be useful.
https://github.com/eggplants/ghcr-badge/blob/master/ghcr_badge/generate.py