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# Copyright 2020 Lars Wirzenius, Peter Lawler
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.
#
# =*= License: GPL-3+ =*=
import os
import vmdb
SCRIPT = """\
#!/bin/sh
rootpart="$(findmnt -n -o SOURCE /)"
rootdev="/dev/$(lsblk -no pkname "$rootpart")"
partno="$(lsblk -n --list "$rootpart" | wc -l)"
flock $rootdev sfdisk -f $rootdev -N "$partno" <<EOF
,+
EOF
sleep 5
udevadm settle
sleep 5
flock $rootdev partprobe $rootdev
mount -o remount,rw $rootpart
resize2fs -f $rootpart
exit 0
"""
SERVICE = """\
[Unit]
Description=resize root file system
Before=local-fs-pre.target
DefaultDependencies=no
[Service]
Type=oneshot
TimeoutSec=infinity
ExecStart=/usr/sbin/resize-rootfs
ExecStart=/bin/systemctl --no-reload disable %n
[Install]
RequiredBy=local-fs-pre.target
"""
class ResizeRootfsPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(ResizeRootfsStepRunner())
class ResizeRootfsStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {"resize-rootfs": str}
def run(self, values, settings, state):
tag = values["resize-rootfs"]
root = state.tags.get_builder_mount_point(tag)
partprobe = self.relative(root, "/sbin/parted")
if not os.path.exists(partprobe):
raise Exception("partprobe is not installed on image, can't resize")
script_path = "/usr/sbin/resize-rootfs"
service_path = "/etc/systemd/system/resize-rootfs.service"
requires_path = "/etc/systemd/system/systemd-remount-fs.service.requires/"
# Install the script that actually does the resizing.
self.install(SCRIPT, root, script_path, 0o755)
# Install the systemd service file to invoke the script at boot.
self.install(SERVICE, root, service_path, 0o644)
# Tell systemd to run the script at the right time. This corresponds to
# "systemctl enable".
self.mkdir(root, "etc/systemd/system/systemd-remount-fs.service.requires")
self.symlink(root, service_path, requires_path)
def relative(self, root, pathname):
return os.path.join(root, "./" + pathname)
def install(self, content, root, filename, mode):
filename = self.relative(root, filename)
with open(filename, "w") as f:
f.write(content)
os.chmod(filename, mode)
def mkdir(self, root, pathname):
pathname = self.relative(root, pathname)
os.makedirs(pathname, exist_ok=True)
def symlink(self, root, linkto, linkname):
linkname = self.relative(root, linkname)
basename = os.path.basename(linkto)
linkname = os.path.join(linkname, basename)
os.symlink(linkto, linkname)
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