provide mirror support (#4148)

Signed-off-by: Avi Deitcher <avi@deitcher.net>

test/cases/000_build/080_mirrors/config.yml

@@ -0,0 +1,31 @@
+version: 0.1
+log:
+  level: debug
+  fields:
+    service: registry
+    environment: development
+storage:
+    delete:
+      enabled: true
+    cache:
+        blobdescriptor: inmemory
+    filesystem:
+        rootdirectory: /var/lib/registry
+    tag:
+      concurrencylimit: 5
+http:
+    addr: :5000
+    debug:
+        addr: :5001
+        prometheus:
+            enabled: true
+            path: /metrics
+health:
+  storagedriver:
+    enabled: true
+    interval: 10s
+    threshold: 3
+
+proxy:
+  remoteurl: https://registry-1.docker.io
+  

test/cases/000_build/080_mirrors/test.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+# SUMMARY: Check that we go through the mirror when building, and fail if mirror configured but not provided
+# LABELS:
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+clean_up() {
+	docker kill "${REGISTRY_NAME}" || true
+	[ -n "${CACHEDIR}" ] && rm -rf "${CACHEDIR}"
+	[ -n "${REGISTRY_DIR}" ] && rm -rf "${REGISTRY_DIR}"
+}
+trap clean_up EXIT
+
+# container names
+REGISTRY_NAME="test-registry-$$"
+REGISTRY_DIR=$(mktemp -d)
+CACHEDIR=$(mktemp -d)
+
+
+
+# 2 tests:
+# 1. build a package configured to use a mirror without starting mirror - should fail
+# 2. build a package configured to use a mirror after starting mirror - should succeed
+if linuxkit --mirror http://localhost:5001 --cache ${CACHEDIR} build --format kernel+initrd --name "${NAME}" ./test.yml; then
+  echo "Test 1 failed: build succeeded without starting mirror"
+  exit 1
+fi
+
+# Start registry
+REGISTRY_CID=$(docker run -d --rm -v $(pwd)/config.yml:/etc/distribution/config.yml --name ${REGISTRY_NAME} -p 5001:5000 registry:3)
+
+# this one should succeed
+linuxkit --mirror http://localhost:5001 --cache ${CACHEDIR} build --format kernel+initrd --name "${NAME}" ./test.yml
+
+exit 0

test/cases/000_build/080_mirrors/test.yml

@@ -0,0 +1,10 @@
+kernel:
+  image: linuxkit/kernel:6.6.71
+  cmdline: "console=ttyS0"
+init:
+  - linuxkit/init:8eea386739975a43af558eec757a7dcb3a3d2e7b
+  - linuxkit/runc:667e7ea2c426a2460ca21e3da065a57dbb3369c9
+onboot:
+  - name: dhcpcd
+    image: linuxkit/dhcpcd:157df9ef45a035f1542ec2270e374f18efef98a5
+    command: ["/sbin/dhcpcd", "--nobackground", "-f", "/dhcpcd.conf", "-1"]

test/cases/040_packages/025_auth/test.sh

@@ -11,7 +11,7 @@ set -e
 clean_up() {
 	docker kill "${REGISTRY_NAME}" || true
 	DOCKER_CONFIG="${DOCKER_CONFIG}" docker buildx rm "${BUILDKIT_NAME}" || true
-	[ -n "${CACHDIR}" ] && rm -rf "${CACHDIR}"
+	[ -n "${CACHEDIR}" ] && rm -rf "${CACHEDIR}"
 	[ -n "${DOCKER_CONFIG}" ] && rm -rf "${DOCKER_CONFIG}"
 	[ -n "${REGISTRY_DIR}" ] && rm -rf "${REGISTRY_DIR}"
 }