After bootstrap, drop to a shell if needed, then shut down cleanly

steps/improve/after.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# SPDX-FileCopyrightText: 2024 Gábor Stefanik <[email protected]>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# After bootstrap, drop to a shell if needed, then shut down cleanly.
+
+. /steps/bootstrap.cfg
+. /steps/env
+
+if [ "${INTERACTIVE}" = True ]; then
+    env - PATH=${PREFIX}/bin PS1="\w # " bash -i
+fi
+
+if [ "${CHROOT}" = False ]; then
+    # ignore errors due to fstab or swapfile not existing
+    swapoff -a &> /dev/null || true
+    sync
+    # sysrq to avoid device busy; then mount to wait for it to finish
+    echo u > /proc/sysrq_trigger
+    mount -o remount,ro /
+    echo o > /proc/sysrq_trigger # power off
+fi

steps/jump/move_disk.sh

@@ -27,5 +27,6 @@ mkdir -p /rootonly
 # This doesn't recursively mount - that's why we're able to copy everything over
 mount --bind / /rootonly
 cp -ar /rootonly/* /newroot/
+sed -e 's/newroot//' /rootonly/etc/mtab | grep -v 'rootonly' > /newroot/etc/mtab
 umount /rootonly
 switch_root /newroot /init

steps/manifest

@@ -182,3 +182,4 @@ build: binutils-2.41
 build: gcc-13.1.0
 improve: null_time ( FORCE_TIMESTAMPS == True )
 improve: update_checksums ( UPDATE_CHECKSUMS == True )
+improve: after