netbox-docker/build-functions/get-public-image-config.sh

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#!/bin/bash
# Retrieves image configuration from public images in DockerHub
# Functions from https://gist.github.com/cirocosta/17ea17be7ac11594cb0f290b0a3ac0d1
# Optimised for our use case
get_image_label() {
local label=$1
local image=$2
local tag=$3
local token
token=$(_get_token "$image")
local digest
digest=$(_get_digest "$image" "$tag" "$token")
local retval="null"
if [ "$digest" != "null" ]; then
retval=$(_get_image_configuration "$image" "$token" "$digest" "$label")
fi
echo "$retval"
}
get_image_layers() {
local image=$1
local tag=$2
local token
token=$(_get_token "$image")
_get_layers "$image" "$tag" "$token"
}
get_image_last_layer() {
local image=$1
local tag=$2
local token
token=$(_get_token "$image")
local layers
mapfile -t layers < <(_get_layers "$image" "$tag" "$token")
echo "${layers[-1]}"
}
_get_image_configuration() {
local image=$1
local token=$2
local digest=$3
local label=$4
curl \
--silent \
--location \
--header "Authorization: Bearer $token" \
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"https://registry-1.docker.io/v2/$image/blobs/$digest" |
jq -r ".config.Labels.\"$label\""
}
_get_token() {
local image=$1
curl \
--silent \
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"https://auth.docker.io/token?scope=repository:$image:pull&service=registry.docker.io" |
jq -r '.token'
}
_get_digest() {
local image=$1
local tag=$2
local token=$3
curl \
--silent \
--header "Accept: application/vnd.docker.distribution.manifest.v2+json" \
--header "Authorization: Bearer $token" \
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"https://registry-1.docker.io/v2/$image/manifests/$tag" |
jq -r '.config.digest'
}
_get_layers() {
local image=$1
local tag=$2
local token=$3
curl \
--silent \
--header "Accept: application/vnd.docker.distribution.manifest.v2+json" \
--header "Authorization: Bearer $token" \
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"https://registry-1.docker.io/v2/$image/manifests/$tag" |
jq -r '.layers[].digest'
}