Replaced curl with Skopeo for in image functions

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

@@ -1,82 +1,17 @@
 #!/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"
+  skopeo inspect "docker://$image" | jq -r ".Labels[\"$label\"]"
 }
 
 get_image_layers() {
   local image=$1
-  local tag=$2
-  local token
-  token=$(_get_token "$image")
-  _get_layers "$image" "$tag" "$token"
+  skopeo inspect "docker://$image" | jq -r ".Layers"
 }
 
 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 $token" \
-    "https://registry-1.docker.io/v2/$image/blobs/$digest" |
-    jq -r ".config.Labels.\"$label\""
-}
-
-_get_token() {
-  local image=$1
-  curl \
-    --silent \
-    "https://auth.docker.io/token?scope=repository:$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 $token" \
-    "https://registry-1.docker.io/v2/$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 $token" \
-    "https://registry-1.docker.io/v2/$image/manifests/$tag" |
-    jq -r '.layers[].digest'
+  skopeo inspect "docker://$image" | jq -r ".Layers | last"
 }