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#!/bin/sh
set -eu
PREFIX="/run/incus_agent"
CDROM="/dev/disk/by-label/incus-agent"
# Functions.
mount_cdrom() {
mount "${CDROM}" "${PREFIX}.mnt" >/dev/null 2>&1
}
mount_9p() {
modprobe 9pnet_virtio >/dev/null 2>&1 || true
mount -t 9p config "${PREFIX}.mnt" -o access=0,trans=virtio,size=1048576 >/dev/null 2>&1
}
fail() {
# Check if we already have an agent in place.
# This will typically be true during restart in the case of a cdrom-based setup.
if [ -x "${PREFIX}/incus-agent" ]; then
echo "${1}, reusing existing agent"
exit 0
fi
# Cleanup and fail.
umount -l "${PREFIX}" >/dev/null 2>&1 || true
eject "${CDROM}" >/dev/null 2>&1 || true
rmdir "${PREFIX}" >/dev/null 2>&1 || true
echo "${1}, failing"
exit 1
}
# Try getting an agent drive.
mkdir -p "${PREFIX}.mnt"
mount_9p || mount_cdrom || fail "Couldn't mount 9p or cdrom"
# Setup the mount target.
umount -l "${PREFIX}" >/dev/null 2>&1 || true
mkdir -p "${PREFIX}"
mount -t tmpfs tmpfs "${PREFIX}" -o mode=0700,size=50M
# Copy the data.
cp -Ra "${PREFIX}.mnt/"* "${PREFIX}"
# Unmount the temporary mount.
umount "${PREFIX}.mnt"
rmdir "${PREFIX}.mnt"
# Eject the cdrom in case it's present.
eject "${CDROM}" >/dev/null 2>&1 || true
# Fix up permissions.
chown -R root:root "${PREFIX}"
# Legacy.
if [ ! -e "${PREFIX}/incus-agent" ] && [ -e "${PREFIX}/lxd-agent" ]; then
ln -s lxd-agent "${PREFIX}"/incus-agent
fi
# Attempt to restore SELinux labels.
restorecon -R "${PREFIX}" >/dev/null 2>&1 || true
exit 0
|
