release: open-source release build logic for unix packages

Updates tailscale/corp#9221

Signed-off-by: David Anderson <danderson@tailscale.com>

release/deb/debian.postinst.sh

@@ -0,0 +1,13 @@
+if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
+	deb-systemd-helper unmask 'tailscaled.service' >/dev/null || true
+	if deb-systemd-helper --quiet was-enabled 'tailscaled.service'; then
+		deb-systemd-helper enable 'tailscaled.service' >/dev/null || true
+	else
+		deb-systemd-helper update-state 'tailscaled.service' >/dev/null || true
+	fi
+
+	if [ -d /run/systemd/system ]; then
+		systemctl --system daemon-reload >/dev/null || true
+		deb-systemd-invoke restart 'tailscaled.service' >/dev/null || true
+	fi
+fi

release/deb/debian.postrm.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+set -e
+if [ -d /run/systemd/system ] ; then
+	systemctl --system daemon-reload >/dev/null || true
+fi
+
+if [ -x "/usr/bin/deb-systemd-helper" ]; then
+    if [ "$1" = "remove" ]; then
+		deb-systemd-helper mask 'tailscaled.service' >/dev/null || true
+	fi
+
+    if [ "$1" = "purge" ]; then
+		deb-systemd-helper purge 'tailscaled.service' >/dev/null || true
+		deb-systemd-helper unmask 'tailscaled.service' >/dev/null || true
+		rm -rf /var/lib/tailscale
+	fi
+fi

release/deb/debian.prerm.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+set -e
+if [ "$1" = "remove" ]; then
+	if [ -d /run/systemd/system ]; then
+		deb-systemd-invoke stop 'tailscaled.service' >/dev/null || true
+	fi
+fi