From 75568a191bed499d12818cd474cf4474b406b6ab Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 29 Jan 2024 15:09:23 +0100
Subject: [bwlp-stage4-tweaks] Add service to grow rootfs to blockdev size

This was previously done in initrd, but it turns out this was happening
rather late and blocked the switchroot for a couple seconds. Let's do it
in stage 4 instead as early as possible, and order it before
gather-hw-info.service, as that service will determine the rootfs free
space and needs to see the properly resized rootfs.
---
 .../data/etc/systemd/system/grow-rootfs.service    |  9 ++++
 .../sysinit.target.wants/grow-rootfs.service       |  1 +
 .../data/opt/openslx/scripts/systemd-grow_rootfs   | 53 ++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/grow-rootfs.service
 create mode 120000 core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/sysinit.target.wants/grow-rootfs.service
 create mode 100644 core/modules/bwlp-stage4-tweaks/data/opt/openslx/scripts/systemd-grow_rootfs

(limited to 'core')

diff --git a/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/grow-rootfs.service b/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/grow-rootfs.service
new file mode 100644
index 00000000..60985596
--- /dev/null
+++ b/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/grow-rootfs.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Grow size of rootfs to underlying block device
+DefaultDependencies=no
+Before=gather-hw-info.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=true
+ExecStart=/opt/openslx/scripts/systemd-grow_rootfs
diff --git a/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/sysinit.target.wants/grow-rootfs.service b/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/sysinit.target.wants/grow-rootfs.service
new file mode 120000
index 00000000..57dd5ae4
--- /dev/null
+++ b/core/modules/bwlp-stage4-tweaks/data/etc/systemd/system/sysinit.target.wants/grow-rootfs.service
@@ -0,0 +1 @@
+../grow-rootfs.service
\ No newline at end of file
diff --git a/core/modules/bwlp-stage4-tweaks/data/opt/openslx/scripts/systemd-grow_rootfs b/core/modules/bwlp-stage4-tweaks/data/opt/openslx/scripts/systemd-grow_rootfs
new file mode 100644
index 00000000..a1b9d22a
--- /dev/null
+++ b/core/modules/bwlp-stage4-tweaks/data/opt/openslx/scripts/systemd-grow_rootfs
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# This tries to call growfs helpers (xfs_growfs, resize2fs, ...) to resize
+# the root filesystem mounted on $NEWROOT to the maximum size of the backing
+# disk partition (done by dmsetup-slx-device).
+
+. /opt/openslx/config
+
+if [ -z "$SLX_DNBD3_DEVICE_COW" ]; then
+	SLX_DNBD3_DEVICE_COW="$( awk '$2 == "/" {print $1; exit}' /proc/mounts )"
+fi
+if ! [ -b "$SLX_DNBD3_DEVICE_COW" ]; then
+	echo "Cannot grow rootfs on '$SLX_DNBD3_DEVICE_COW' - not a block device"
+	exit 0
+fi
+
+resize_rootfs() {
+	# First let's check what filesystem it is
+	local fstype helper
+	declare -a options
+	fstype="$(blkid "$SLX_DNBD3_DEVICE_COW" | grep -oE 'TYPE=\S+')"
+	if [ -z "$fstype" ]; then
+		echo "Failed to detect filesystem on '$SLX_DNBD3_DEVICE_COW' - ignoring."
+		return 1
+	fi
+	fstype="${fstype#TYPE=}"
+	fstype="${fstype//\"/}"
+	case "$fstype" in
+	ext?)
+		helper="resize2fs"
+		options=()
+		;;
+	xfs)
+		helper="xfs_growfs"
+		options=( "-d" )
+		;;
+	*)
+		echo "'$fstype' not supported - ignoring."
+		return 1
+		;;
+	esac
+	if ! hash "${helper}" &> /dev/null; then
+		echo "'$fstype' is supported, but cannot find helper binary - ignoring."
+		return 1
+	fi
+	if ! "${helper}" "${options[@]}" "$SLX_DNBD3_DEVICE_COW"; then
+		echo "Failed to run '${helper}' on '${SLX_DNBD3_DEVICE_COW}'."
+		return 1
+	fi
+	return 0
+}
+
+resize_rootfs
-- 
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