Build deb package

.goreleaser.yml

@@ -31,3 +31,28 @@ release:
   # If set to true, will mark the release as not ready for production.
   # Default is false.
   prerelease: auto
+
+nfpms:
+  -
+    vendor: Arne Jørgensen
+    maintainer: Arne Jørgensen <arne@arnested.dk>
+    description: Local Docker Development DNS
+    license: MIT
+    formats:
+      - deb
+    dependencies:
+      - docker.io
+      - libsystemd0
+    bindir: /usr/libexec
+    contents:
+      - src: ldddns.service
+        dst: /lib/systemd/system/ldddns.service
+        type: config
+
+      - src: ldddns.env
+        dst: /etc/default/ldddns
+        type: config
+    scripts:
+      postinstall: "scripts/postinstall.sh"
+      preremove: "scripts/preremove.sh"
+      postremove: "scripts/postremove.sh"

README.md

@@ -20,6 +20,8 @@ https://my-fancy.local).
 
 ## Install
 
+Download the `.deb` file and run:
+
 ```console
-curl -fsSL https://raw.githubusercontent.com/arnested/ldddns/main/install.sh | bash
+sudo dpkg -i ldddns_0.0.16_linux_amd64.deb
 ```

ldddns.env

@@ -0,0 +1 @@
+DOCKER_API_VERSION=1.40

ldddns.service

@@ -0,0 +1,39 @@
+[Unit]
+Description=Local Docker Development DNS
+BindTo=docker.service
+After=docker.service
+
+[Service]
+Type=notify
+EnvironmentFile=-/etc/default/ldddns
+ExecStart=/usr/libexec/ldddns
+SuccessExitStatus=15
+Restart=on-failure
+DynamicUser=yes
+SupplementaryGroups=docker
+CapabilityBoundingSet=
+DevicePolicy=closed
+IPAddressDeny=any
+LockPersonality=yes
+MemoryDenyWriteExecute=yes
+NoNewPrivileges=yes
+PrivateDevices=yes
+PrivateNetwork=yes
+PrivateUsers=yes
+ProtectClock=yes
+ProtectControlGroups=yes
+ProtectHome=yes
+ProtectHostname=yes
+ProtectKernelLogs=yes
+ProtectKernelModules=yes
+ProtectKernelTunables=yes
+RestrictAddressFamilies=AF_UNIX
+RestrictNamespaces=yes
+RestrictRealtime=yes
+SystemCallArchitectures=native
+SystemCallErrorNumber=EPERM
+SystemCallFilter=@system-service
+UMask=0777
+
+[Install]
+WantedBy=docker.service

main.go

@@ -17,12 +17,13 @@ import (
 	"github.com/holoplot/go-avahi"
 )
 
-func main() {
-	if len(os.Args) < 2 || os.Args[1] != "service" {
-		installService()
-		os.Exit(0)
-	}
+// Version string to be set at compile time via command line (-ldflags "-X main.version=1.2.3").
+var (
+	version string
+)
 
+func main() {
+	logf(PriNotice, "Starting ldddns %s...", version)
 	// Setup stuff.
 	docker, err := client.NewClientWithOpts(client.FromEnv)
 	if err != nil {

scripts/postinstall.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -e
+
+docker_version=$(/usr/bin/docker version --format '{{ .Server.APIVersion }}')
+
+/usr/bin/sed -i "s/\(DOCKER_API_VERSION=\).*/\1${docker_version}/" /etc/default/ldddns
+
+/bin/systemctl daemon-reload
+
+if /bin/systemctl is-active --quiet ldddns.service; then
+    /bin/systemctl restart ldddns.service
+fi
+
+if ! /bin/systemctl is-enabled --quiet ldddns.service; then
+    /bin/systemctl enable --now ldddns.service;
+fi

scripts/postremove.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -e
+
+/bin/systemctl daemon-reload

scripts/preremove.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+if /bin/systemctl is-active --quiet ldddns.service; then
+    /bin/systemctl stop ldddns.service
+fi
+
+if /bin/systemctl is-enabled --quiet ldddns.service; then
+    /bin/systemctl disable --now ldddns.service;
+fi