[PATCH 12/16] meta: Add expand-on-first-boot support package

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

When installed, this systemd service expands the last partition on a the
boot medium to the full size of that medium. It then deactivates itself.

Based on sysvinit version by Henning Schild.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 .../expand-on-first-boot/expand-on-first-boot.bb   | 25 +++++++++++++++++
 .../files/expand-last-partition.sh                 | 31 ++++++++++++++++++++++
 .../files/expand-on-first-boot.service             | 23 ++++++++++++++++
 .../expand-on-first-boot/files/postinst            |  3 +++
 4 files changed, 82 insertions(+)
 create mode 100644 meta/recipes-support/expand-on-first-boot/expand-on-first-boot.bb
 create mode 100644 meta/recipes-support/expand-on-first-boot/files/expand-last-partition.sh
 create mode 100644 meta/recipes-support/expand-on-first-boot/files/expand-on-first-boot.service
 create mode 100644 meta/recipes-support/expand-on-first-boot/files/postinst

diff --git a/meta/recipes-support/expand-on-first-boot/expand-on-first-boot.bb b/meta/recipes-support/expand-on-first-boot/expand-on-first-boot.bb
new file mode 100644
index 0000000..49d6c3b
--- /dev/null
+++ b/meta/recipes-support/expand-on-first-boot/expand-on-first-boot.bb
@@ -0,0 +1,25 @@
+# Resize last partition to full medium size on fist boot
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2018
+#
+# SPDX-License-Identifier: MIT
+
+inherit dpkg-raw
+
+DESCRIPTION = "This service grows the last partition to the full medium during first boot"
+
+DEBIAN_DEPENDS = "systemd, sed, grep, coreutils, mount, e2fsprogs, util-linux"
+
+SRC_URI = " \
+    file://expand-on-first-boot.service \
+    file://expand-last-partition.sh \
+    file://postinst"
+
+do_install() {
+    install -d -m 755 ${D}/lib/systemd/system
+    install -m 644 ${WORKDIR}/expand-on-first-boot.service ${D}/lib/systemd/system/
+
+    install -d -m 755 ${D}/usr/share/expand-on-first-boot
+    install -m 755 ${WORKDIR}/expand-last-partition.sh ${D}/usr/share/expand-on-first-boot/
+}
diff --git a/meta/recipes-support/expand-on-first-boot/files/expand-last-partition.sh b/meta/recipes-support/expand-on-first-boot/files/expand-last-partition.sh
new file mode 100644
index 0000000..913e63b
--- /dev/null
+++ b/meta/recipes-support/expand-on-first-boot/files/expand-last-partition.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# Resize last partition to full medium size
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2018
+#
+# SPDX-License-Identifier: MIT
+
+set -e
+
+ROOT_DEV=$(findmnt / -o source -n)
+BOOT_DEV=$(echo ${ROOT_DEV} | sed 's/p\?[0-9]*$//')
+
+if [ "${ROOT_DEV}" = "${BOOT_DEV}" ]; then
+	echo "Boot device equals root device - no partitioning found" >&2
+	exit 1
+fi
+
+LAST_PART=$(sfdisk -d ${BOOT_DEV} 2>/dev/null | tail -1 | cut -d ' ' -f 1)
+
+# Remove all hints to the current medium (last-lba) and last partition size,
+# then ask sfdisk to recreate the partitioning
+sfdisk -d ${BOOT_DEV} 2>/dev/null | grep -v last-lba | \
+	sed 's|\('${LAST_PART}' .*, \)size=[^,]*, |\1|' | \
+	sfdisk --force ${BOOT_DEV}
+
+# Inform the kernel about the partitioning change
+partx -u ${LAST_PART}
+
+resize2fs ${LAST_PART}
diff --git a/meta/recipes-support/expand-on-first-boot/files/expand-on-first-boot.service b/meta/recipes-support/expand-on-first-boot/files/expand-on-first-boot.service
new file mode 100644
index 0000000..cbe3857
--- /dev/null
+++ b/meta/recipes-support/expand-on-first-boot/files/expand-on-first-boot.service
@@ -0,0 +1,23 @@
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2018
+#
+# SPDX-License-Identifier: MIT
+
+[Unit]
+Description=Expand last partition
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=systemd-remount-fs.service
+Before=sysinit.target shutdown.target
+ConditionPathIsReadWrite=/etc
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/share/expand-on-first-boot/expand-last-partition.sh
+ExecStartPost=-/bin/systemctl disable expand-on-first-boot.service
+StandardOutput=syslog
+StandardError=syslog
+
+[Install]
+WantedBy=sysinit.target
diff --git a/meta/recipes-support/expand-on-first-boot/files/postinst b/meta/recipes-support/expand-on-first-boot/files/postinst
new file mode 100644
index 0000000..a190b01
--- /dev/null
+++ b/meta/recipes-support/expand-on-first-boot/files/postinst
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+systemctl enable expand-on-first-boot.service
-- 
2.16.4