filesystem: T3946: partition resize as a service

3 files changed, 72 insertions, 0 deletions

diff --git a/src/conf_mode/system-option.py b/src/conf_mode/system-option.py
index 454611c55..ddb91aeaf 100755
--- a/src/conf_mode/system-option.py
+++ b/src/conf_mode/system-option.py
@@ -125,6 +125,12 @@ def apply(options):
     if 'keyboard_layout' in options:
         cmd('loadkeys {keyboard_layout}'.format(**options))
 
+    # Enable/diable root-partition-auto-resize SystemD service
+    if 'root_partition_auto_resize' in options:
+      cmd('systemctl enable root-partition-auto-resize.service')
+    else:
+      cmd('systemctl disable root-partition-auto-resize.service')
+
 if __name__ == '__main__':
     try:
         c = get_config()
diff --git a/src/op_mode/force_root-partition-auto-resize.sh b/src/op_mode/force_root-partition-auto-resize.sh
new file mode 100755
index 000000000..4f13e3e03
--- /dev/null
+++ b/src/op_mode/force_root-partition-auto-resize.sh
@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2021 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# ROOT_PART_DEV – root partition device path
+# ROOT_PART_NAME – root partition device name
+# ROOT_DEV_NAME – disk device name
+# ROOT_DEV – disk device path
+# ROOT_PART_NUM – number of root partition on disk
+# ROOT_DEV_SIZE – disk total size in 512 bytes sectors
+# ROOT_PART_SIZE – root partition total size in 512 bytes sectors
+# ROOT_PART_START – number of 512 bytes sector where root partition starts
+# AVAILABLE_EXTENSION_SIZE – calculation available disk space after root partition in 512 bytes sectors
+ROOT_PART_DEV=$(findmnt /usr/lib/live/mount/persistence -o source -n)
+ROOT_PART_NAME=$(echo "$ROOT_PART_DEV" | cut -d "/" -f 3)
+ROOT_DEV_NAME=$(echo /sys/block/*/"${ROOT_PART_NAME}" | cut -d "/" -f 4)
+ROOT_DEV="/dev/${ROOT_DEV_NAME}"
+ROOT_PART_NUM=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/partition")
+ROOT_DEV_SIZE=$(cat "/sys/block/${ROOT_DEV_NAME}/size")
+ROOT_PART_SIZE=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/size")
+ROOT_PART_START=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/start")
+AVAILABLE_EXTENSION_SIZE=$((ROOT_DEV_SIZE - ROOT_PART_START - ROOT_PART_SIZE - 8))
+
+#
+# Check if device have space for root partition growing up.
+#
+if [ $AVAILABLE_EXTENSION_SIZE -lt 1 ]; then
+    echo "There is no available space for root partition extension"
+    exit 0;
+fi
+
+#
+# Resize the partition and grow the filesystem.
+#
+parted -m ${ROOT_DEV} ---pretend-input-tty > /dev/null 2>&1 <<EOF 
+resizepart
+${ROOT_PART_NUM}
+Yes
+100%
+EOF
+partprobe > /dev/null 2>&1
+resize2fs ${ROOT_PART_DEV} > /dev/null 2>&1
diff --git a/src/systemd/root-partition-auto-resize.service b/src/systemd/root-partition-auto-resize.service
new file mode 100644
index 000000000..a57fbc3d8
--- /dev/null
+++ b/src/systemd/root-partition-auto-resize.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=VyOS root partition auto resizing
+After=multi-user.target
+
+[Service]
+Type=oneshot
+User=root
+Group=root
+ExecStart=/usr/libexec/vyos/op_mode/force_root-partition-auto-resize.sh 
+
+[Install]
+WantedBy=vyos.target
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