Add support for delve debugging in the shell

Dockerfile

@@ -356,7 +356,7 @@ ENV BUILDKIT_SETUP_CGROUPV2_ROOT=1
 ENTRYPOINT ["buildkitd"]
 
 FROM buildkit-linux AS buildkit-linux-debug
-COPY --link --from=dlv /usr/bin/dlv /usr/bin/dlv
+COPY --link --from=dlv /out/dlv /usr/bin/dlv
 COPY --link --chmod=755 <<EOF /docker-entrypoint.sh
 #!/bin/sh
 exec dlv exec /usr/bin/buildkitd \\
@@ -424,6 +424,7 @@ COPY --link --from=cni-plugins /opt/cni/bin/bridge /opt/cni/bin/host-local /opt/
 COPY --link hack/fixtures/cni.json /etc/buildkit/cni.json
 COPY --link hack/fixtures/dns-cni.conflist /etc/buildkit/dns-cni.conflist
 COPY --link --from=binaries / /usr/bin/
+COPY --link --from=dlv /out/dlv /usr/bin/dlv
 
 # integration-tests prepares an image suitable for running all tests
 FROM integration-tests-base AS integration-tests

hack/run

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+set -e
+
+if ! command -v $1 &>/dev/null; then
+  echo >&2 'error: binary-daemon or dynbinary-daemon must be run before run'
+  false
+fi
+
+COMMAND="$(command -v $1)"
+
+if [ -n "$DELVE_PORT" ]; then
+  delve_listen_port="${DELVE_PORT##*:}"
+fi
+
+command=("$COMMAND")
+
+if [ -n "$DELVE_PORT" ]; then
+  command=(
+    dlv
+    --listen="0.0.0.0:$delve_listen_port"
+    --headless=true
+    --log
+    --api-version=2
+    --only-same-user=false
+    --check-go-version=false
+    --accept-multiclient
+    exec "${command[@]}" --
+  )
+fi
+
+set -x
+# shellcheck disable=SC2086
+exec "${command[@]}"

hack/shell

@@ -9,16 +9,26 @@ function clean() {
 iidfile=$(mktemp -t docker-iidfile.XXXXXXXXXX)
 DOCKER_BUILDKIT=1 docker build --iidfile $iidfile --build-arg BUILDKIT_DEBUG --target dev-env .
 
+BUILDKIT_REGISTRY_MIRROR_DIR="/root/.cache/registry"
+
+ENV="-e DELVE_PORT -e BUILDKIT_REGISTRY_MIRROR_DIR"
+
 trap clean EXIT
 SSH=
 if [ -n "$MOUNT_SSH_AUTH_SOCK" ]; then
   SSH="-v $SSH_AUTH_SOCK:$SSH_AUTH_SOCK -e SSH_AUTH_SOCK"
 fi
 
-volumes=
+volumes="-v /tmp"
 if [ -n "$MOUNT_BUILDKIT_SOURCE" ]; then
-  volumes="-v $(pwd):/src"
+  volumes="$volumes -v $(pwd):/src"
 fi
 
+if [ -n "$DELVE_PORT" ]; then
+  DELVE_PORT_FORWARD="-p $DELVE_PORT"
+fi
+
+DOCKER_FLAGS="-it --rm --privileged --name=buildkit-dev $SSH $volumes $ENV $DELVE_PORT_FORWARD"
+
 set -x
-docker run $SSH $volumes -it --privileged -v /tmp -e BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry --rm $(cat $iidfile) ash
+docker run $DOCKER_FLAGS $(cat $iidfile) ash