From c755b89265898af30b88642494c7311a4a3f3513 Mon Sep 17 00:00:00 2001
From: René 'Necoro' Neumann <necoro@necoro.eu>
Date: Tue, 12 May 2020 23:39:29 +0200
Subject: Docker Setup

---
 .goreleaser.yml    | 35 ++++++++++++++++++++++++++++++++++-
 Dockerfile         | 11 ++++-------
 README.md          | 20 ++++++++++----------
 docker-compose.yml | 13 -------------
 4 files changed, 48 insertions(+), 31 deletions(-)
 delete mode 100644 docker-compose.yml

diff --git a/.goreleaser.yml b/.goreleaser.yml
index 4b328af..63ae887 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -4,7 +4,8 @@ before:
   hooks:
     - go mod download
 builds:
-  -  
+  -
+    id: standalone
     binary: feed2imap-go
     ldflags:
         - -s -w -X github.com/Necoro/feed2imap-go/pkg/version.version={{.Version}} -X github.com/Necoro/feed2imap-go/pkg/version.commit={{.ShortCommit}}
@@ -14,8 +15,40 @@ builds:
         - darwin
     goarch:
         - amd64
+
+  # for DOCKER we explicitly disable CGO
+  # we keep it enabled for the standalone version, b/c it might have advantages on
+  # more complicated setups, where the go internal implementations call out to glibc
+  -
+    id: docker
+    binary: feed2imap-go
+    env:
+      - CGO_ENABLED=0
+    ldflags:
+        - -s -w -X github.com/Necoro/feed2imap-go/pkg/version.version={{.Version}} -X github.com/Necoro/feed2imap-go/pkg/version.commit={{.ShortCommit}}
+    goos:
+        - linux
+    goarch:
+        - amd64
+
+dockers:
+  -
+    builds:
+        - docker
+    goos: linux
+    goarch: amd64
+    binaries:
+        - feed2imap-go
+    image_templates:
+        - "feed2imap-go:latest"
+        - "feed2imap-go:{{ .Version }}"
+        - "docker.pkg.github.com/necoro/feed2imap-go/feed2imap-go:latest"
+        - "docker.pkg.github.com/necoro/feed2imap-go/feed2imap-go:{{ .Version }}"
+
 archives:
   -
+    builds:
+        - standalone
     replacements:
         amd64: x86_64
         386: x86_32
diff --git a/Dockerfile b/Dockerfile
index cd221bd..1d26d4e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,6 @@
-FROM golang:alpine
+FROM alpine
 
-RUN mkdir /app
-WORKDIR /app
-COPY dist/feed2imap-go_linux_amd64/feed2imap-go /app/feed2imap-go
-COPY config.yml /app/config.yml
-
-ENTRYPOINT ["/app/feed2imap-go", "-c", "/app/data/feed.cache", "-f", "/app/config.yml" ]
+COPY feed2imap-go /
 
+ENTRYPOINT ["/feed2imap-go"]
+CMD ["-c", "/data/feed.cache", "-f", "/data/config.yml"]
diff --git a/README.md b/README.md
index f6c3186..60ea6ac 100644
--- a/README.md
+++ b/README.md
@@ -92,24 +92,24 @@ and b) the update process is not clear, especially regarding the dependencies.
 
 ### Run in docker
 
-Build docker image:
+Most times, putting feed2imap-go somewhere and adding a cron job does everything you need. For the times, where it isn't we provide docker containers for your convenience at [Github Packages](https://github.com/Necoro/feed2imap-go/packages).
 
+The container is configured to expect both config file and cache under `/data/`, thus needs it mounted there. 
+When both are stored in `~/feed`, you can do:
 ````bash
-docker build -t feed2imap-go .
+docker run -v ~/feed:/data docker.pkg.github.com/necoro/feed2imap-go/feed2imap-go:latest
 ````
 
-Run docker-command:
-
+Alternatively, build the docker image yourself (requires the `feed2imap-go` binary at toplevel):
 ````bash
-docker volume create docker_feeddata
-docker container run -v feeddata:/app/data feed2imap-go
+docker build -t feed2imap-go .
 ````
+Note that the supplied binary must not be linked to glibc, i.e. has to be built with `CGO_ENABLED=0`. When using `goreleaser`, you'll find this in  `dist/docker_linux_amd64`.
 
-Or run with docker-compose:
+Or you can roll your own Dockerfile, supplying a glibc...
+
+**NB**: feed2imap-go employs no server-mode. Thus, each run terminates directly after a couple seconds. Therefore, the docker container in itself is not that useful and you have to have a mechanism in place to spin up the container regularly.
 
-````bash
-docker-compose up
-````
 
 [i6]: https://github.com/Necoro/feed2imap-go/issues/6
 [i4]: https://github.com/Necoro/feed2imap-go/issues/4
diff --git a/docker-compose.yml b/docker-compose.yml
deleted file mode 100644
index d27aa2a..0000000
--- a/docker-compose.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-version: "2"
-
-services:
-
-  feed2imap:
-    image: "feed2imap-go"
-    volumes:
-      - "feeddata:/app/data"
-
-volumes:
-  feeddata:
-
-
-- 
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