[DistroKit] [PATCH 05/10] datapartition: generate partitions via systemd-repart

[Roland Hieber <rhi@pengutronix.de>]

Generating the second rootfs and the data partition on the first boot
has the advantage that the generated images can get even smaller, and we
can resize the data partition on-the-fly to fill the available space on
the boot medium.

Specify a minimum of 200 MiB for the first and second root partitions
just so that both are of equal size. (This will fit any root.ext2 in any
of our platforms with about 25% of space left.) If the first root
partition in the image is smaller, it will get resized too, including
the filesystem it contains.

Remove the old systemd-autoformat service and the mkfs-ext4 udev rule,
which also only handled the case where the data partition was the third
partition on the disk (which is not always the case anymore since we
have partitions for barebox-state or device-specific firmware).

Signed-off-by: Roland Hieber <rhi@pengutronix.de>
---
 projectroot/etc/rc.once.d/repart                  |  3 +++
 projectroot/etc/repart.rc-once.d/10-root.conf     |  5 +++++
 projectroot/etc/repart.rc-once.d/20-root.conf     |  6 ++++++
 projectroot/etc/repart.rc-once.d/30-data.conf     |  6 ++++++
 .../systemd/system/systemd-autoformat@.service    | 15 ---------------
 .../usr/lib/udev/rules.d/91-mkfs-ext4.rules       |  5 -----
 rules/datapartition.in                            |  3 +++
 rules/datapartition.make                          | 11 +++++++----
 8 files changed, 30 insertions(+), 24 deletions(-)
 create mode 100755 projectroot/etc/rc.once.d/repart
 create mode 100644 projectroot/etc/repart.rc-once.d/10-root.conf
 create mode 100644 projectroot/etc/repart.rc-once.d/20-root.conf
 create mode 100644 projectroot/etc/repart.rc-once.d/30-data.conf
 delete mode 100644 projectroot/usr/lib/systemd/system/systemd-autoformat@.service
 delete mode 100644 projectroot/usr/lib/udev/rules.d/91-mkfs-ext4.rules

diff --git a/projectroot/etc/rc.once.d/repart b/projectroot/etc/rc.once.d/repart
new file mode 100755
index 000000000000..675c4e3e57f4
--- /dev/null
+++ b/projectroot/etc/rc.once.d/repart
@@ -0,0 +1,3 @@
+#!/bin/sh
+echo "Repartitioning the root disk..."
+systemd-repart --dry-run=no --definitions=/etc/repart.rc-once.d/
diff --git a/projectroot/etc/repart.rc-once.d/10-root.conf b/projectroot/etc/repart.rc-once.d/10-root.conf
new file mode 100644
index 000000000000..ae6f2c21e286
--- /dev/null
+++ b/projectroot/etc/repart.rc-once.d/10-root.conf
@@ -0,0 +1,5 @@
+[Partition]
+Label=root-A
+Type=root
+SizeMinBytes=200M
+Weight=1
diff --git a/projectroot/etc/repart.rc-once.d/20-root.conf b/projectroot/etc/repart.rc-once.d/20-root.conf
new file mode 100644
index 000000000000..3408b6ad156a
--- /dev/null
+++ b/projectroot/etc/repart.rc-once.d/20-root.conf
@@ -0,0 +1,6 @@
+[Partition]
+Label=root-B
+Type=root
+SizeMinBytes=200M
+Weight=1
+Format=ext4
diff --git a/projectroot/etc/repart.rc-once.d/30-data.conf b/projectroot/etc/repart.rc-once.d/30-data.conf
new file mode 100644
index 000000000000..cc5aebfd87d3
--- /dev/null
+++ b/projectroot/etc/repart.rc-once.d/30-data.conf
@@ -0,0 +1,6 @@
+[Partition]
+Label=data
+Type=linux-generic
+SizeMinBytes=200M
+Weight=999999
+Format=ext4
diff --git a/projectroot/usr/lib/systemd/system/systemd-autoformat@.service b/projectroot/usr/lib/systemd/system/systemd-autoformat@.service
deleted file mode 100644
index 75221403398c..000000000000
--- a/projectroot/usr/lib/systemd/system/systemd-autoformat@.service
+++ /dev/null
@@ -1,15 +0,0 @@
-[Unit]
-Before=mnt-data.mount systemd-fsck@%i.service
-Description=Create ext4 Data Partition
-ConditionPathExists=/dev/%i
-
-[Service]
-Environment=DATAPARTITION=3
-Type=oneshot
-# resize partition to maximum
-ExecStart=/bin/sh -c 'echo ",+" | sfdisk --force -N$DATAPARTITION /dev/mmcblk0'
-# force kernel to reload the partition size of partition 3
-ExecStart=/usr/sbin/partx -d -n $DATAPARTITION /dev/mmcblk0
-ExecStart=/usr/sbin/partx -a -n $DATAPARTITION /dev/mmcblk0
-# create filesystem (this service is only started if we have none)
-ExecStart=/sbin/mkfs.ext4 /dev/%i
diff --git a/projectroot/usr/lib/udev/rules.d/91-mkfs-ext4.rules b/projectroot/usr/lib/udev/rules.d/91-mkfs-ext4.rules
deleted file mode 100644
index 8af8f6cd39ba..000000000000
--- a/projectroot/usr/lib/udev/rules.d/91-mkfs-ext4.rules
+++ /dev/null
@@ -1,5 +0,0 @@
-ACTION!="add", GOTO="systemd-autoformat-ext4-devices_end"
-SUBSYSTEM!="block", GOTO="systemd-autoformat-ext4-devices_end"
-ENV{ID_FS_USAGE}!="filesystem", SUBSYSTEMS=="mmc", KERNEL=="mmcblk0p3", ENV{ID_PART_ENTRY_TYPE}=="0x83", ENV{ID_FS_TYPE}!="ext4", ENV{SYSTEMD_WANTS}+="systemd-autoformat@$name.service"
-
-LABEL="systemd-autoformat-ext4-devices_end"
diff --git a/rules/datapartition.in b/rules/datapartition.in
index 4343e7c4e430..5b8c737fb8ad 100644
--- a/rules/datapartition.in
+++ b/rules/datapartition.in
@@ -2,4 +2,7 @@
 
 config DATAPARTITION
 	tristate
+	select RC_ONCE
+	select SYSTEMD
+	select SYSTEMD_REPART
 	default y
diff --git a/rules/datapartition.make b/rules/datapartition.make
index b79bcf01efcc..808448033eee 100644
--- a/rules/datapartition.make
+++ b/rules/datapartition.make
@@ -1,6 +1,7 @@
 # -*-makefile-*-
 #
 # Copyright (C) 2016 by Robert Schwebel <r.schwebel@pengutronix.de>
+# Copyright (C) 2023 Roland Hieber, Pengutronix <rhi@pengutronix.de>
 #
 # For further information about the PTXdist project and license conditions
 # see the README file.
@@ -26,10 +27,12 @@ $(STATEDIR)/datapartition.targetinstall:
 	@$(call install_fixup,datapartition,AUTHOR,"Robert Schwebel <r.schwebel@pengutronix.de>")
 	@$(call install_fixup,datapartition,DESCRIPTION,missing)
 
-	@$(call install_alternative, datapartition, 0, 0, 0644, \
-		/usr/lib/systemd/system/systemd-autoformat@.service)
-	@$(call install_alternative, datapartition, 0, 0, 0644, \
-		/usr/lib/udev/rules.d/91-mkfs-ext4.rules)
+	@# Note: we only want to call systemd-repart in rc-once, so don't
+	@# install the configs to any path picked up by systemd-repart.service
+	@$(call install_alternative_tree, datapartition, 0, 0, \
+		/etc/repart.rc-once.d/)
+	@$(call install_alternative, datapartition, 0, 0, 0755, \
+		/etc/rc.once.d/repart)
 
 	@$(call install_finish,datapartition)
 
-- 
2.39.2