From 8587cdcd7c69ab218c5e97d60be9ce6762f63f67 Mon Sep 17 00:00:00 2001
From: Jim Clark <slimslenderslacks@gmail.com>
Date: Thu, 18 May 2023 00:48:57 -0700
Subject: [PATCH] use entrypoint

---
 .dockerignore   | 33 ++++++++++++++++++++++-
 Dockerfile      |  3 +--
 Dockerfile.init | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 flake.nix       | 11 +++++---
 4 files changed, 113 insertions(+), 6 deletions(-)
 create mode 100644 Dockerfile.init

diff --git a/.dockerignore b/.dockerignore
index fdfdf9c..3aae539 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1 +1,32 @@
-pod-atomisthq-tools.docker
+# Include any files or directories that you don't want to be copied to your
+# container here (e.g., local build artifacts, temporary files, etc.).
+#
+# For more help, visit the .dockerignore file reference guide at
+# https://docs.docker.com/engine/reference/builder/#dockerignore-file
+
+**/.DS_Store
+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/bin
+**/charts
+**/docker-compose*
+**/compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+LICENSE
+README.md
diff --git a/Dockerfile b/Dockerfile
index 353065a..692bfe1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,6 @@ RUN \
     --mount=type=cache,target=/root/.cache \
     --mount=type=bind,target=/tmp/build \
     <<EOF 
-  ls -l /nix/store | wc
   nix \
     --extra-experimental-features "nix-command flakes" \
     --extra-substituters "http://host.docker.internal?priority=10" \
@@ -26,4 +25,4 @@ WORKDIR /app
 
 COPY --from=builder /tmp/nix-store-closure /nix/store
 COPY --from=builder /tmp/output/ /app/
-ENTRYPOINT ["/app/result/bin/babashka-pod-docker"]
+ENTRYPOINT ["/app/result/bin/entrypoint"]
diff --git a/Dockerfile.init b/Dockerfile.init
new file mode 100644
index 0000000..ee44b16
--- /dev/null
+++ b/Dockerfile.init
@@ -0,0 +1,72 @@
+# syntax=docker/dockerfile:1
+
+# Comments are provided throughout this file to help you get started.
+# If you need more help, visit the Dockerfile reference guide at
+# https://docs.docker.com/engine/reference/builder/
+
+################################################################################
+# Create a stage for building the application.
+ARG GO_VERSION=1.19
+FROM golang:${GO_VERSION} AS build
+WORKDIR /src
+
+# Download dependencies as a separate step to take advantage of Docker's caching.
+# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
+# Leverage bind mounts to go.sum and go.mod to avoid having to copy them into
+# the container.
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=bind,source=go.sum,target=go.sum \
+    --mount=type=bind,source=go.mod,target=go.mod \
+    go mod download -x
+
+# Build the application.
+# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
+# Leverage a bind mount to the current directory to avoid having to copy the
+# source code into the container.
+RUN --mount=type=cache,target=/go/pkg/mod/ \
+    --mount=type=bind,target=. \
+    CGO_ENABLED=0 go build -o /bin/server .
+
+################################################################################
+# Create a new stage for running the application that contains the minimal
+# runtime dependencies for the application. This often uses a different base
+# image from the build stage where the necessary files are copied from the build
+# stage.
+#
+# The example below uses the alpine image as the foundation for running the app.
+# By specifying the "latest" tag, it will also use whatever happens to be the
+# most recent version of that image when you build your Dockerfile. If
+# reproducability is important, consider using a versioned tag
+# (e.g., alpine:3.17.2) or SHA (e.g., alpine:sha256:c41ab5c992deb4fe7e5da09f67a8804a46bd0592bfdf0b1847dde0e0889d2bff).
+FROM alpine:latest AS final
+
+# Install any runtime dependencies that are needed to run your application.
+# Leverage a cache mount to /var/cache/apk/ to speed up subsequent builds.
+RUN --mount=type=cache,target=/var/cache/apk \
+    apk --update add \
+        ca-certificates \
+        tzdata \
+        && \
+        update-ca-certificates
+
+# Create a non-privileged user that the app will run under.
+# See https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#user
+ARG UID=10001
+RUN adduser \
+    --disabled-password \
+    --gecos "" \
+    --home "/nonexistent" \
+    --shell "/sbin/nologin" \
+    --no-create-home \
+    --uid "${UID}" \
+    appuser
+USER appuser
+
+# Copy the executable from the "build" stage.
+COPY --from=build /bin/server /bin/
+
+# Expose the port that the application listens on.
+EXPOSE 3000
+
+# What the container should run when it is started.
+ENTRYPOINT [ "/bin/server" ]
diff --git a/flake.nix b/flake.nix
index 4ea6ab7..e0a3757 100644
--- a/flake.nix
+++ b/flake.nix
@@ -36,7 +36,7 @@
           ];
         };
         packages = rec {
-          default = pkgs.buildGoApplication {
+          app = pkgs.buildGoApplication {
             pname = "babashka-pod-docker";
             version = "0.0.1";
             src = ./.;
@@ -49,11 +49,16 @@
             name = "docker-pod";
             tag = "latest";
             config = {
-              Cmd = [ "${default}/bin/babashka-pod-docker" ];
+              Cmd = [ "${app}/bin/babashka-pod-docker" ];
             };
           };
 
-          default-linux = default.overrideAttrs (old: old // { GOOS = "linux"; GOARCH = "arm64"; });
+          default-linux = app.overrideAttrs (old: old // { GOOS = "linux"; GOARCH = "arm64"; });
+
+	  default = pkgs.writeShellScriptBin "entrypoint" ''
+	    ${app}/bin/babashka-pod-docker
+	  '';
+
           docker-arm64 = pkgs.dockerTools.buildImage {
             name = "docker-pod";
             tag = "latest";