base: Expand root in initramfs

Scripts based on cloud-initramfs-growroot

debian/control

@@ -13,6 +13,7 @@ Architecture: arm64
 Depends:
  ${misc:Depends},
  ${shlibs:Depends},
+ cloud-initramfs-growroot,
  flash-kernel,
  jitterentropy-rngd,
  u-boot-tools,

debian/copyright

@@ -3,6 +3,12 @@ Source: https://code.puri.sm/Librem5/librem5-evk-tools.git
 
 Files: *
 Copyright: 2018 Purism SPC
+License: GPL-3+
+
+Files: usr/*
+Copyright: 2011 Scott Moser <scott.moser@canonical.com>, 2019 Purism SPC
+License: GPL-3+
+
 License: GPL-3+
  This package is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -19,3 +25,4 @@ License: GPL-3+
  .
  On Debian systems, the complete text of the GNU General
  Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".
+

debian/librem5-devkit-base.install

 etc/
 lib/
+usr/

debian/librem5-devkit-base.postinst

@@ -23,6 +23,8 @@ case "$1" in
 	systemctl enable serial-getty@ttyGS0
 	# Mass storage is required for Ethernet+serial over USB via g_multi
 	truncate -s 1M /var/lib/mass_storage_dummy
+	# Enable resize2fs hook
+	dpkg-trigger update-initramfs
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)

debian/librem5-devkit-base.postrm

@@ -24,6 +24,7 @@ case "$1" in
     ;;
     remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
 	systemctl disable serial-getty@ttyGS0
+	dpkg-trigger update-initramfs
     ;;
 
     *)

usr/share/initramfs-tools/hooks/resize_rootfs

+#!/bin/sh
+set -e
+
+PREREQS=""
+case $1 in
+    prereqs) echo "${PREREQS}"; exit 0;;
+esac
+
+. /usr/share/initramfs-tools/hook-functions
+
+##
+for pname in resize2fs; do
+    fpath=$(which "$pname") && copy_exec "$fpath" ||
+        { echo "ERROR: no '$pname' in path" 1>&2; exit 1; }
+done
+
+# vi: ts=4 noexpandtab

usr/share/initramfs-tools/scripts/local-bottom/resize_rootfs

+#!/bin/sh
+set -e
+
+PREREQS="growroot"
+case $1 in
+    prereqs) echo "${PREREQS}"; exit 0;;
+esac
+
+. /scripts/functions
+
+msg() { echo "resize_rootfs:" "$@" ; }
+fail() { [ $# -eq 0 ] || msg "$@"; exit 1; }
+
+# if a file indicates we should do nothing, then just exit
+for f in /var/lib/cloud/instance/root-grown /etc/growroot-disabled \
+        /etc/growroot-grown; do
+        [ -f "${rootmnt}$f" ] && exit 0
+done
+
+# Get the root device, root filesystem and mount options
+if ! out=$(awk '$2 == mt { print }' "mt=${rootmnt}" < /proc/mounts) ; then
+	fail "${out}"
+	return
+fi
+
+# Need to do it this way, can't use '<<< "${out}"' since RHEL6 doesn't
+# seem to understand it
+read _rootdev _rootmnt rootfs opts unused <<EOF
+${out}
+EOF
+
+# the filesystem is mounted read-only. Referencing the device leads toan invalid argument
+umount ${rootmnt} || msg "failed to unmount ${ROOT}."
+
+# this will fail in local-bottom due to the rootfs being mounted and read only
+set +e
+out=$(resize2fs "${ROOT}" 2>&1)
+set -e
+ret=$?
+
+# this is taken from 'mountroot' function
+#   see /usr/share/initramfs-tools/scripts/local
+mount -t ${rootfs} -o ${opts} ${ROOT} ${rootmnt} ||
+        fail "failed to re-mount ${ROOT}. this is bad!"
+
+case "$ret" in
+	0) msg "succeeded" "$out";;
+	*) msg "exited '$ret'" "${out}"; exit 1;;
+esac
+