modification for testing go-delve/delve#3781

.vscode/launch.json

@@ -0,0 +1,34 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Connect to server",
+            "type": "go",
+            "request": "attach",
+            "mode": "remote",
+            "remotePath": "${workspaceFolder}",
+            "debugAdapter": "dlv-dap",
+            "port": 40000,
+            "host": "127.0.0.1",
+            "showLog": true,
+            "logOutput": "dap",
+
+            "ClientMod2Dir": {
+                // Add the info from `substitute-path-guess-helper` output. Example:
+                    "main": "/usr/local/google/home/hakim/projects/go-docker-alpine-remote-debug",
+                    "github.com/ccampo133/go-docker-alpine-remote-debug":"/usr/local/google/home/hakim/projects/go-docker-alpine-remote-debug"
+            }
+
+            /* manual config :-(
+                "substitutePath": [
+                {
+                    "from": "${workspaceFolder}",
+                    "to": "/app",
+                }],
+            */           
+        }
+    ]
+}

Dockerfile

@@ -5,8 +5,9 @@ WORKDIR /app
 # Turning off Cgo is required to install Delve on Alpine.
 ENV CGO_ENABLED=0
 
-# Download and install the Delve debugger.
-RUN go install github.com/go-delve/delve/cmd/dlv@latest
+# Build and install patched delve (checked out in the delve directory)
+COPY delve /tmp/delve
+RUN go install -C /tmp/delve ./cmd/dlv
 
 COPY go.mod .
 COPY go.sum .
@@ -17,7 +18,8 @@ RUN go mod download
 COPY main.go .
 
 # Disable inlining and optimizations that can interfere with debugging.
-RUN go build -gcflags "all=-N -l" -o /main main.go
+#RUN go build -gcflags "all=-N -l" -o /main main.go
+RUN go build -gcflags "all=-N -l" -o /main .
 
 FROM alpine:3.17
 

README.md

@@ -1,3 +1,32 @@
+This is forked from github.com/ccampo133/go-docker-alpine-remote-debug for
+testing delve DAP testing. It assumes there is a checked out copy of delve
+under the `delve` directory. Let's assume you checked out this repo in
+$WORKDIR.
+
+```
+git clone https://github.com/hyangah/go-docker-alpine-remote-debug $WORKDIR
+cd $WORKDIR
+
+git clone https://github.com/go-delve/delve
+cd delve
+git fetch upstream pull/3781/head
+go build ./cmd/dlv
+```
+
+From the $WORKDIR, running the `dlv substitue-path-guess-helper` gave me:
+
+```
+./delve/dlv substitute-path-guess-helper
+{"ModuleDirectories":{"github.com/ccampo133/go-docker-alpine-remote-debug":"/usr/local/google/home/hakim/projects/go-docker-alpine-remote-debug"}}
+```
+
+Update `ClientMod2Dir` attribute in `$WORKDIR/.vscode/launch.json`.
+
+Read the "Dockerfile" to see how the container is built.
+
+Then, follow the remaining instruction below.
+
+
 # go-docker-alpine-remote-debug
 
 A simple example on how to enable remote debugging using [Delve](https://github.com/go-delve/delve) 

run.sh

@@ -5,7 +5,7 @@
 cmd="/bin/app"
 if [ "$REMOTE_DEBUG_PORT" ]; then
   echo "Starting application with remote debugging on port $REMOTE_DEBUG_PORT"
-  dlvFlags="--listen=:$REMOTE_DEBUG_PORT --headless=true --log --api-version=2 --accept-multiclient"
+  dlvFlags="--listen=:$REMOTE_DEBUG_PORT --headless=true --log --api-version=2 --accept-multiclient --log-output=dap,debugger"
   execFlags=""
   # Simply setting this environment variable is enough to force the debugger to
   # pause on start --- we don't care about the value.