push-image-docker.sh

# Create a tar gz of the layer
cd ~/hello-cloud/imageLayer
tar -czvf ../hello-cloud.tar.gz *
cd ~/hello-cloud

# Obtain digests and diff IDs
LAYERDIGEST=$(sha256sum < hello-cloud.tar.gz | cut -d' ' -f1)
LAYERDIFF=$(gunzip < hello-cloud.tar.gz | sha256sum | cut -d' ' -f1)
LAYERSIZE=$(ls -l hello-cloud.tar.gz | awk '{print $5}')

# Create configuration.json
cat <<EOF > configuration.json
{
  "architecture": "amd64",
  "os": "linux",
  "config": {
    "Env": [
        "PATH=/bin"
    ],
    "Entrypoint": [
      "hello-cloud"
    ],
    "Cmd": [
      "Cloud Native Central!"
    ]    
  },
  "rootfs": {
    "type": "layers",
    "diff_ids": [
      "sha256:${LAYERDIFF}"
    ]
  },
  "history": [
    {
      "created_by": "Ravikanth C"
    }
  ]
}
EOF

CONFIGDIGEST=$(sha256sum < configuration.json | cut -d' ' -f1)
CONFIGSIZE=$(ls -l configuration.json | awk '{print $5}')

# Generate manifest.json
cat << EOF > manifest.json
{
  "schemaVersion": 2,
  "mediaType": "application/vnd.oci.image.manifest.v1+json",
  "config": {
    "mediaType": "application/vnd.oci.image.config.v1+json",
    "size": $CONFIGSIZE,
    "digest": "sha256:$CONFIGDIGEST"
  },
  "layers": [
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "size": $LAYERSIZE,
      "digest": "sha256:$LAYERDIGEST"
    }
  ]
}
EOF

# Authenticate and get token
USERNAME=ravikanth
REPO="${USERNAME}/hello-cloud"
TOKEN=$(curl -v -u "$USERNAME" "https://auth.docker.io/token?service=registry.docker.io&scope=repository:$REPO:pull,push" | jq '.token' | cut -d\" -f2)

# Push layers
# Step 1 - Get upload location
LOCATION=$(curl -i https://registry.hub.docker.com/v2/$REPO/blobs/uploads/ -H "Authorization: Bearer $TOKEN" -d '' | grep location | cut -d" " -f2 | tr -d '\r')
LOCATION=$(curl -i $LOCATION -X PATCH -H "Content-Length: $LAYERSIZE" -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/octet-stream" --data-binary @hello-cloud.tar.gz | grep location | cut -d" " -f2 | tr -d '\r')
curl "$LOCATION&digest=sha256:$LAYERDIGEST" -X PUT -H "Authorization: Bearer $TOKEN" -v

# Push configuration.json
LOCATION=$(curl -i https://registry.hub.docker.com/v2/$REPO/blobs/uploads/ -H "Authorization: Bearer $TOKEN" -d '' | grep location | cut -d" " -f2 | tr -d '\r')
LOCATION=$(curl -i $LOCATION -X PATCH -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/octet-stream" --data-binary @configuration.json | grep location | cut -d" " -f2 | tr -d '\r')
curl "$LOCATION&digest=sha256:$CONFIGDIGEST" -X PUT -H "Authorization: Bearer $TOKEN" -v

# Push manifest
curl "https://registry.hub.docker.com/v2/$REPO/manifests/latest" -X PUT -H "Content-Type: application/vnd.oci.image.manifest.v1+json" -H "Authorization: Bearer $TOKEN" --data-binary @manifest.json -v