feat: initial docker installation support

Refs #1076

docker/etc/cron.d/dokku-retire

@@ -0,0 +1,4 @@
+PATH=/usr/local/bin:/usr/bin:/bin
+SHELL=/bin/bash
+
+*/5 * * * * root /usr/bin/dokku ps:retire >> /var/log/dokku/retire.log 2>&1

docker/etc/logrotate.d/services

@@ -0,0 +1,9 @@
+/var/log/services/* {
+  daily
+  missingok
+  rotate 7
+  compress
+  delaycompress
+  notifempty
+  copytruncate
+}

docker/etc/my_init.d/10_directories

@@ -0,0 +1,36 @@
+#!/bin/bash
+set -eo pipefail
+
+log-info() {
+  declare desc="Log info formatter"
+  echo "    $*" 1>&2
+}
+
+log-fail() {
+  declare desc="Log fail formatter"
+  echo "!   $*" 1>&2
+  exit 1
+}
+
+main() {
+  if [[ ! -d /mount ]]; then
+    log-info "Creating missing /mount"
+    mkdir -p /mount
+  fi
+
+  directories=("/etc/ssh" "/home/dokku" "/var/lib/dokku/config"  "/var/lib/dokku/data")
+  for dir in "${directories[@]}"; do
+    if [[ ! -e "$dir" ]]; then
+      log-info "Copying ${dir} skel into place"
+      mkdir -p "/mount${dir}"
+      rsync -a "/skel${dir}/" "${dir}/" || log-fail "Unable to copy ${dir} skel into place"
+    fi
+
+    # chown mount directories to "dokku:dokku"
+    if [[ "$dir" != "/etc/ssh" ]]; then
+      find "$dir" -print0 | xargs -0 chown -h dokku:dokku
+    fi
+  done
+}
+
+main "$@"

docker/etc/runit/runsvdir/default/dokku-init/finish

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+exec >> /var/log/services/dokku-restore
+exec 2>&1
+
+if [[ "$1" -ne 0 ]]; then
+  echo "Error initializing dokku! Retrying in 30 seconds..."
+  exec sleep 30
+  exit 0
+fi
+
+echo "Done initializing dokku."
+exec sleep infinity
+
+exit 0

docker/etc/runit/runsvdir/default/dokku-init/run

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+exec >> /var/log/services/dokku-init
+exec 2>&1
+
+echo "Running dokku-init"
+cd /tmp || exit 1
+
+if [[ -n "$DOKKU_HOSTNAME" ]]; then
+  echo "dokku dokku/vhost_enable boolean true" | debconf-set-selections
+  dokku --quiet domains:set-global "$DOKKU_HOSTNAME"
+fi
+
+exec dokku ps:restore

docker/etc/runit/runsvdir/default/nginx/run

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+exec >> /var/log/services/nginx
+exec 2>&1
+
+echo "Running nginx"
+exec /usr/sbin/nginx -c /etc/nginx/nginx.conf -g "daemon off;"

docker/etc/runit/runsvdir/default/rsyslog/run

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+exec >> /var/log/services/rsyslog
+exec 2>&1
+
+echo "Running rsyslog"
+exec /usr/sbin/rsyslogd -n

docker/etc/sudoers.d/dokku-docker

@@ -0,0 +1 @@
+dokku    ALL=NOPASSWD:SETENV:/usr/bin/docker

docker/usr/local/bin/docker

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $TRACE ]] && set -x
+
+main() {
+  declare desc="re-runs docker commands as sudo"
+  local DOCKER_BIN=""
+  if [[ -x "/usr/bin/docker" ]]; then
+    DOCKER_BIN="/usr/bin/docker"
+  fi
+
+  if [[ -z "$DOCKER_BIN" ]]; then
+    echo "!   No docker binary found" 1>&2
+    exit 1
+  fi
+
+  sudo -E "$DOCKER_BIN" "$@"
+}
+
+main "$@"