From aab836d3de585b030b01b780bcf60249216c2800 Mon Sep 17 00:00:00 2001
From: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Date: Sat, 10 Dec 2022 04:13:42 +0100
Subject: [PATCH v5] In expand last partition script btrfs support added
Improvement, expand-on-first-boot: support for btrfs added
v2: the mount point for btrfs filesystem to resize is under /dev/shm
by default but a variable defined in the running environment can
change the temporary directory path. The /dev/shm has been chosen
because in some systems /tmp can be on a RO root filesystem and
/tmp not yet mounted with tmpfs. This requires the system to have
/dev/shm configured into the kernel.
v3: the previous version was using a bashism but the shebang is /bin/sh
this means that the script will fail in a customized system in which /bin/sh
do not link to bash or bash is not available.
v4: Felix suggested using mktemp for the temporary directory in which to
mount the btrfs filesystem to resize. The default path /tmp could be changed
using the variable TMPDIR to set in the running environment.
v5: typo fixes into the patch description
Signed-off-by: Roberto A. Foglietta <roberto.foglietta@gmail.com>
---
.../expand-on-first-boot_1.2.bb | 2 +-
.../files/expand-last-partition.sh | 37 ++++++-------------
2 files changed, 13 insertions(+), 26 deletions(-)
@@ -10,7 +10,7 @@ inherit dpkg-raw
DESCRIPTION = "This service grows the last partition to the full medium during first boot"
MAINTAINER = "isar-users <isar-users@googlegroups.com>"
-DEBIAN_DEPENDS = "systemd, sed, grep, coreutils, mount, e2fsprogs, fdisk (>=2.29.2-3) | util-linux (<2.29.2-3), util-linux"
+DEBIAN_DEPENDS = "systemd, sed, grep, coreutils, mount, e2fsprogs, fdisk (>=2.29.2-3) | util-linux (<2.29.2-3), util-linux, btrfs-progs"
SRC_URI = " \
file://expand-on-first-boot.service \
@@ -59,29 +59,16 @@ sfdisk -d "${BOOT_DEV}" 2>/dev/null | \
# Inform the kernel about the partitioning change
partx -u "${LAST_PART}"
-# this is for debian stretch or systemd < 236
-if [ ! -x /lib/systemd/systemd-growfs ]; then
- # Do not fail resize2fs if no mtab entry is found, e.g.,
- # when using systemd mount units.
- export EXT2FS_NO_MTAB_OK=1
+# Do not fail resize2fs if no mtab entry is found, e.g.,
+# when using systemd mount units.
+export EXT2FS_NO_MTAB_OK=1
- resize2fs "${LAST_PART}"
- exit 0
-fi
-
-if grep -q x-systemd.growfs /etc/fstab; then
- echo "Found x-systemd.growfs option in /etc/fstab, won't call it explicitly." >&2
- exit 0
-fi
-
-# mount $LAST_PART out of tree, so we won't conflict with other mounts
-MOUNT_POINT=$(mktemp -d -p /mnt "$(basename "$0").XXXXXXXXXX")
-if [ ! -d "${MOUNT_POINT}" ]; then
- echo "Cannot create temporary mount point ${MOUNT_POINT}." >&2
- exit 1
-fi
-
-mount "${LAST_PART}" "${MOUNT_POINT}"
-/lib/systemd/systemd-growfs "${MOUNT_POINT}"
-umount "${MOUNT_POINT}"
-rmdir "${MOUNT_POINT}"
+case $(lsblk -fno FSTYPE "${LAST_PART}") in
+ ext4) resize2fs "${LAST_PART}"
+ ;;
+ btrfs) tmpdir=$(mktemp -d -p "$TMPDIR" btrfs.XXXX)
+ mount "${LAST_PART}" $tmpdir
+ btrfs filesystem resize max $tmpdir
+ umount $tmpdir && rmdir $tmpdir
+ ;;
+esac
--
2.34.1