hack: add docker-compose file for development

This adds a simple docker compose file for development. The development
version of buildkit will build with the dockerfile, set debug to true,
use a tcp address to be compatible with the remote driver, and enable
the debug image through delve to allow for remote debugging.

It also configures additional services for help with development. At
the moment, this only includes jaeger for collecting traces but can also
include additional services in the future for things like metrics
collection.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

hack/compose

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+# Use to set up a dev environment for buildkit.
+# Not meant for production deployments.
+# Use the same way you would use docker compose.
+#
+#     $ hack/compose up -d --build
+#
+# Can be extended for local development by adding
+# a compose.override.yaml file to the same directory.
+#
+# Additional config files for extra services can
+# also be placed in the same folder and they will
+# be automatically ignored by git.
+#
+# To access the newly created development buildkit,
+# use either:
+#
+#     $ buildctl --addr tcp://127.0.0.1:1234 ...
+#
+# or alternatively configure a new builder with buildx.
+#
+#     $ docker buildx create \
+#         --bootstrap \
+#         --name dev \
+#         --driver remote \
+#         tcp://127.0.0.1:1234
+#     $ docker buildx --builder dev ...
+
+. $(dirname $0)/util
+set -eu -o pipefail
+
+filesDir=$(dirname $0)/composefiles
+
+args=(compose '-f' "$filesDir/compose.yaml")
+if [ -f "$filesDir/compose.override.yaml" ]; then
+  args+=('-f' "$filesDir/compose.override.yaml")
+fi
+
+dockerCmd "${args[@]}" "$@"

hack/composefiles/.gitignore

@@ -0,0 +1,8 @@
+# Exclude everything to allow this folder to be used for other service
+# configurations.
+*
+
+# Specifically allow certain configuration files.
+!.gitignore
+!buildkitd.toml
+!compose.yaml

hack/composefiles/buildkitd.toml

@@ -0,0 +1,5 @@
+debug = true
+
+[grpc]
+  address = [ "tcp://0.0.0.0:1234" ]
+  debugAddress = "0.0.0.0:6060"

hack/composefiles/compose.yaml

@@ -0,0 +1,35 @@
+name: buildkit
+services:
+  buildkit:
+    container_name: buildkit-dev
+    build:
+      context: ../..
+      args:
+        BUILDKIT_DEBUG: 1
+    image: moby/buildkit:local
+    ports:
+      - 127.0.0.1:1234:1234
+      - 127.0.0.1:5000:5000
+      - 127.0.0.1:6060:6060
+    restart: always
+    privileged: true
+    environment:
+      DELVE_PORT: 5000
+      OTEL_EXPORTER_OTLP_TRACES_ENDPOINT: http://jaeger:4317
+    configs:
+      - source: buildkit_config
+        target: /etc/buildkit/buildkitd.toml
+    volumes:
+      - buildkit:/var/lib/buildkit
+
+  jaeger:
+    image: jaegertracing/all-in-one:latest
+    ports:
+      - 127.0.0.1:16686:16686
+
+volumes:
+  buildkit:
+
+configs:
+  buildkit_config:
+    file: ./buildkitd.toml