From 6412a308e89edd3b02b1764cb70347150fe85f17 Mon Sep 17 00:00:00 2001
From: Tony Grosinger <tony@grosinger.net>
Date: Tue, 6 Dec 2022 08:34:49 -0800
Subject: [PATCH] Add Dockerfile

The dockerfile is used both as the dev container as well as the
production container. The production container is built with only the
executable binary and dependencies.
---
 Dockerfile | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Dockerfile

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..678d7c6
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM docker.io/library/golang:1.19-bullseye as dev
+
+FROM dev as intermediate
+
+COPY . /build
+WORKDIR /build
+RUN go build -o doddns && \
+    ldd doddns | tr -s '[:blank:]' '\n' | grep '^/' | \
+    awk '{printf("%s\n", $1); system("readlink -f " $1)}' | \
+    xargs -I % sh -c 'mkdir -p $(dirname deps%); cp % deps%;'
+
+FROM scratch as prod
+
+COPY --from=intermediate /build/deps /
+COPY --from=intermediate /build/doddns /doddns
+COPY --from=intermediate /etc/ssl/certs/* /etc/ssl/certs/
+COPY --from=intermediate /usr/share/ca-certificates /usr/share/ca-certificates
+
+WORKDIR /
+ENTRYPOINT ["/doddns"]