fix(cache-repo): switch back to kaniko default behavior

README.md

@@ -122,7 +122,7 @@ If you use **different registries** for snapshot and release images, you shall u
 
 There might be cases where you need to provide the complete [Docker configuration file](https://docs.docker.com/engine/reference/commandline/cli/#configuration-files):
 
-* need to declare authentication credentials for other registries than the 2 predefined ones (snapshot & release), 
+* need to declare authentication credentials for other registries than the 2 predefined ones (snapshot & release),
 * need to declare a [credentials store](https://docs.docker.com/engine/reference/commandline/login/#credentials-store) (ex: in order to [publish to Amazon ECR](https://github.com/GoogleContainerTools/kaniko#pushing-to-amazon-ecr) with Kaniko for instance),
 * need to declare [proxies](https://docs.docker.com/engine/reference/commandline/cli/#automatic-proxy-configuration-for-containers),
 * ...
@@ -136,7 +136,7 @@ If you are in one of those cases, you will need to use the `DOCKER_CONFIG_FILE`
 | ------------------------- | --------------------- | ------------------------------------------------- |
 | `DOCKER_CONFIG_FILE`      | Path to the Docker configuration file (JSON) | `.docker/config.json` |
 
-Moreover, this file supports **dynamic environment variables replacement**. 
+Moreover, this file supports **dynamic environment variables replacement**.
 That means it may contain references to other environment variables (in the format `${variable_name}`) that will be dynamically replaced
 by the template before evaluation.
 In addition to you own defined variables, you may use the following variables (provided and managed by the template):
@@ -294,12 +294,13 @@ This job builds the image and publishes it to the _snapshot_ repository.
 
 It is bound to the `package-build` stage, and uses the following variables:
 
-| Name                            | Description                                                                                                   | Default value                  |
-| ------------------------------- | ------------------------------------------------------------------------------------------------------------- | ------------------------------ |
-| `DOCKER_BUILD_ARGS`             | Additional `docker/kaniko/buildah` `build` arguments                                                                  | _(none)_                       |
-| `DOCKER_REGISTRY_MIRROR`        | URL of a Docker registry mirror to use during the image build (instead of default `https://index.docker.io`) <br>:warning: Used by the `kaniko` and `dind` options only  | _(none)_                       |
-| `CONTAINER_REGISTRIES_CONFIG_FILE` | The [`registries.conf`](https://www.redhat.com/sysadmin/manage-container-registries) configuration to be used<br>:warning: Used by the `buildah` build only | _(none)_ |
-| `DOCKER_METADATA`               | Additional `docker build`/`kaniko` arguments to set label                                                     | OCI Image Format Specification |
+| Name                               | Description                                                                                                                                                             | Default value                  |
+| ---------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------ |
+| `DOCKER_BUILD_ARGS`                | Additional `docker/kaniko/buildah` `build` arguments                                                                                                                    | _(none)_                       |
+| `DOCKER_REGISTRY_MIRROR`           | URL of a Docker registry mirror to use during the image build (instead of default `https://index.docker.io`) <br>:warning: Used by the `kaniko` and `dind` options only | _(none)_                       |
+| `CONTAINER_REGISTRIES_CONFIG_FILE` | The [`registries.conf`](https://www.redhat.com/sysadmin/manage-container-registries) configuration to be used<br>:warning: Used by the `buildah` build only             | _(none)_                       |
+| `DOCKER_METADATA`                  | Additional `docker build`/`kaniko` arguments to set label                                                                                                               | OCI Image Format Specification |
+| `KANIKO_SNAPSHOT_IMAGE_CACHE`      | Snapshot image repository that will be used to store cached layers<br>:warning: Used by the `kaniko` build only                                                         | `${DOCKER_SNAPSHOT_IMAGE%:*}/cache` |
 
 This job produces _output variables_ that are propagated to downstream jobs (using [dotenv artifacts](https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportsdotenv)):
 

kicker.json

@@ -107,6 +107,12 @@
       "name": "CONTAINER_REGISTRIES_CONFIG_FILE",
       "description": "The [registries.conf](https://www.redhat.com/sysadmin/manage-container-registries) configuration to be used\n\n_Used by the `buildah` build only_",
       "advanced": true
+    },
+    {
+      "name": "KANIKO_SNAPSHOT_IMAGE_CACHE",
+      "description": "Snapshot image repository that will be used to store cached layers.\n\n_Used by the `kaniko` build only_",
+      "default": "${DOCKER_SNAPSHOT_IMAGE%:*}/cache",
+      "advanced": true
     }
   ],
   "features": [

templates/gitlab-ci-docker.yml

@@ -420,7 +420,7 @@ stages:
 
   function run_build_kaniko() {
     docker_image=$1
-    kaniko_registry_repository="${DOCKER_SNAPSHOT_IMAGE%:*}"
+    kaniko_snapshot_image_cache="${KANIKO_SNAPSHOT_IMAGE_CACHE:-${DOCKER_SNAPSHOT_IMAGE%:*}/cache}"
     shift
     if [[ -n "$DOCKER_REGISTRY_MIRROR" ]]
     then
@@ -428,9 +428,9 @@ stages:
       kaniko_registry_mirror_option="--registry-mirror $(echo ${DOCKER_REGISTRY_MIRROR} | sed "s|^https*://||")"
     fi
     log_info "Build & deploy image $docker_image"
-    log_info "Kaniko command: /kaniko/executor --context $(docker_context_path) --dockerfile $DOCKER_FILE --destination $docker_image --cache --cache-dir=${CI_PROJECT_DIR}/.cache --cache-repo=$kaniko_registry_repository --verbosity $DOCKER_KANIKO_VERBOSITY $kaniko_registry_mirror_option $DOCKER_METADATA $DOCKER_BUILD_ARGS $*"
+    log_info "Kaniko command: /kaniko/executor --context $(docker_context_path) --dockerfile $DOCKER_FILE --destination $docker_image --cache --cache-dir=${CI_PROJECT_DIR}/.cache --cache-repo=${kaniko_snapshot_image_cache} --verbosity $DOCKER_KANIKO_VERBOSITY $kaniko_registry_mirror_option $DOCKER_METADATA $DOCKER_BUILD_ARGS $*"
     # shellcheck disable=SC2086
-    /kaniko/executor --context "$(docker_context_path)" --dockerfile "$DOCKER_FILE" --destination "$docker_image" --cache --cache-dir="${CI_PROJECT_DIR}/.cache" --cache-repo="$kaniko_registry_repository" --verbosity $DOCKER_KANIKO_VERBOSITY $kaniko_registry_mirror_option $DOCKER_METADATA $DOCKER_BUILD_ARGS "$@"
+    /kaniko/executor --context "$(docker_context_path)" --dockerfile "$DOCKER_FILE" --destination "$docker_image" --cache --cache-dir="${CI_PROJECT_DIR}/.cache" --cache-repo="${kaniko_snapshot_image_cache}" --verbosity $DOCKER_KANIKO_VERBOSITY $kaniko_registry_mirror_option $DOCKER_METADATA $DOCKER_BUILD_ARGS "$@"
   }
 
   # Used by containers tools like buildah, skopeo.