Make firstboot updates configurable

systemd/pikit-firstboot.sh

@@ -14,6 +14,7 @@ CERT_DIR="/etc/pikit/certs"
 WEB_ASSETS="/var/www/pikit-web/assets"
 PROFILE_FILE="/etc/pikit/profile.json"
 MOTD_FILE="/etc/motd"
+FIRSTBOOT_CONF="/etc/pikit/firstboot.conf"
 
 STEPS=(
   "Preparing system"
@@ -26,11 +27,27 @@ STEPS=(
 STEP_STATUS=(pending pending pending pending pending pending)
 CURRENT_STEP=""
 CURRENT_INDEX=-1
+PIKIT_FIRSTBOOT_UPDATES="${PIKIT_FIRSTBOOT_UPDATES:-1}"
 
 log() {
   printf '[%s] %s\n' "$(date '+%Y-%m-%dT%H:%M:%S%z')" "$*"
 }
 
+load_config() {
+  if [ -f "$FIRSTBOOT_CONF" ]; then
+    # shellcheck disable=SC1090
+    . "$FIRSTBOOT_CONF"
+  fi
+  PIKIT_FIRSTBOOT_UPDATES="${PIKIT_FIRSTBOOT_UPDATES:-1}"
+}
+
+skip_updates() {
+  case "${PIKIT_FIRSTBOOT_UPDATES,,}" in
+    0|false|no|off) return 0 ;;
+  esac
+  return 1
+}
+
 write_state() {
   local state="$1"
   local current="$2"
@@ -121,6 +138,7 @@ mkdir -p "$FIRSTBOOT_DIR"
 exec >>"$LOG_FILE" 2>&1
 
 log "Pi-Kit firstboot starting"
+load_config
 
 if [ -f "$DONE_FILE" ]; then
   log "Firstboot already completed; exiting."
@@ -206,11 +224,15 @@ fi
 finish_step 2
 
 begin_step 3
-export DEBIAN_FRONTEND=noninteractive
-mkdir -p /var/cache/apt/archives/partial /var/lib/apt/lists/partial
-chmod 755 /var/cache/apt/archives /var/cache/apt/archives/partial /var/lib/apt/lists /var/lib/apt/lists/partial
-apt-get update
-apt-get -y -o Dpkg::Options::=--force-confold full-upgrade
+if skip_updates; then
+  log "Skipping software updates (PIKIT_FIRSTBOOT_UPDATES=$PIKIT_FIRSTBOOT_UPDATES)."
+else
+  export DEBIAN_FRONTEND=noninteractive
+  mkdir -p /var/cache/apt/archives/partial /var/lib/apt/lists/partial
+  chmod 755 /var/cache/apt/archives /var/cache/apt/archives/partial /var/lib/apt/lists /var/lib/apt/lists/partial
+  apt-get update
+  apt-get -y -o Dpkg::Options::=--force-confold full-upgrade
+fi
 finish_step 3
 
 begin_step 4