From f7e65daa4b4225d3c181ca09e4d784e918a254c9 Mon Sep 17 00:00:00 2001
From: Christian Haeusler <794584+corvus-ch@users.noreply.github.com>
Date: Mon, 21 Dec 2020 15:53:35 +0100
Subject: [PATCH 1/4] Enable auto pre-release detection

---
 .goreleaser.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.goreleaser.yml b/.goreleaser.yml
index 20d3e9c4f..407686ffa 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -34,6 +34,8 @@ changelog:
     - '^Merge pull request'
 
 release:
+  prerelease: auto
+
   github:
     owner: vshn
     name: k8up

From e40ff6fe0fe06861e21d71a22c8c0d4d38160b16 Mon Sep 17 00:00:00 2001
From: Christian Haeusler <794584+corvus-ch@users.noreply.github.com>
Date: Mon, 21 Dec 2020 16:00:06 +0100
Subject: [PATCH 2/4] Prevent pre-releases from creating `latest` images

---
 .goreleaser.yml | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/.goreleaser.yml b/.goreleaser.yml
index 407686ffa..5d828e66c 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -16,11 +16,17 @@ snapshot:
   name_template: "{{ .Tag }}-snapshot"
 
 dockers:
+# The `latest` is not touched for pre release.
+# The template string `{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}`
+# will compute to `latest` for regular release. For pre releases, it will
+# compute to `v{{ .Version }}`. This duplicates one of the other list items
+# and therefore eliminates `latest` from the list. This is OK to do since
+# `goreleaser` builds the image only once and tagging is a cheap operation.
 - image_templates:
-  - "docker.io/vshn/k8up:latest"
+  - "docker.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
   - "docker.io/vshn/k8up:v{{ .Version }}"
   - "docker.io/vshn/k8up:v{{ .Major }}"
-  - "quay.io/vshn/k8up:latest"
+  - "quay.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
   - "quay.io/vshn/k8up:v{{ .Version }}"
   - "quay.io/vshn/k8up:v{{ .Major }}"
 

From 260ff3e7cfb46413aa61bc95a352cc13cbfae1c5 Mon Sep 17 00:00:00 2001
From: Chris <github.account@chrigel.net>
Date: Mon, 21 Dec 2020 17:26:36 +0100
Subject: [PATCH 3/4] Prevent pre-releases from creating floating Major version
 images

---
 .goreleaser.yml | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/.goreleaser.yml b/.goreleaser.yml
index 5d828e66c..55477b2bc 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -23,12 +23,14 @@ dockers:
 # and therefore eliminates `latest` from the list. This is OK to do since
 # `goreleaser` builds the image only once and tagging is a cheap operation.
 - image_templates:
-  - "docker.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
   - "docker.io/vshn/k8up:v{{ .Version }}"
-  - "docker.io/vshn/k8up:v{{ .Major }}"
-  - "quay.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
   - "quay.io/vshn/k8up:v{{ .Version }}"
-  - "quay.io/vshn/k8up:v{{ .Major }}"
+
+  - "docker.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}v{{ .Major }}{{ end }}"
+  - "quay.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}v{{ .Major }}{{ end }}"
+
+  - "docker.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
+  - "quay.io/vshn/k8up:{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}"
 
 changelog:
   sort: asc

From 7b33f43815f0397742e6cf22eb2740222354ca75 Mon Sep 17 00:00:00 2001
From: Christian Haeusler <794584+corvus-ch@users.noreply.github.com>
Date: Tue, 22 Dec 2020 09:22:06 +0100
Subject: [PATCH 4/4] Generalize explanation of image tag templating

---
 .goreleaser.yml | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/.goreleaser.yml b/.goreleaser.yml
index 55477b2bc..6e62681d4 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -16,12 +16,14 @@ snapshot:
   name_template: "{{ .Tag }}-snapshot"
 
 dockers:
-# The `latest` is not touched for pre release.
-# The template string `{{ if .Prerelease }}v{{ .Version }}{{ else }}latest{{ end }}`
-# will compute to `latest` for regular release. For pre releases, it will
-# compute to `v{{ .Version }}`. This duplicates one of the other list items
-# and therefore eliminates `latest` from the list. This is OK to do since
-# `goreleaser` builds the image only once and tagging is a cheap operation.
+# For pre releases, updating `latest` and the floating tags of the major
+# version does not make sense. So only the image for the exact version should
+# be pushed.
+# For the lack of a less verbose solution, go templating is used to set the
+# image tags to the major version or latest for normal releases. For pre
+# releases, all image tags are set to the exact version. This will result in
+# having the same image tag tree times in the list. This is fine to do as the
+# image will be built only once and tagging is a cheap operation.
 - image_templates:
   - "docker.io/vshn/k8up:v{{ .Version }}"
   - "quay.io/vshn/k8up:v{{ .Version }}"