#!/bin/bash

# lxc: linux Container library

# Authors:
# Serge Hallyn <serge.hallyn@ubuntu.com>
#
# This is a test script for unprivileged containers

# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# This library 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
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

# This test assumes an Ubuntu host

if [ $(id -u) -ne 0 ]; then
	echo "ERROR: Must run as root."
	exit 1
fi

# Test if we're using an overlayfs module that handles symlinks correctly. If
# not, we skip these tests since overlay clones will not work correctly.
if modprobe -q overlayfs; then
        TMPDIR=$(mktemp -d)

        MOUNTDIR="${TMPDIR}/ovl_symlink_test"

        mkdir ${MOUNTDIR}

        mount -t tmpfs none ${MOUNTDIR}

        mkdir ${MOUNTDIR}/{lowerdir,upperdir,workdir,overlayfs}
        mount -t overlayfs -o lowerdir="${MOUNTDIR}/lowerdir",upperdir="${MOUNTDIR}/upperdir",workdir="${MOUNTDIR}/workdir" none "${MOUNTDIR}/overlayfs"

        CORRECT_LINK_TARGET="${MOUNTDIR}/overlayfs/dummy_file"
        exec 9> "${CORRECT_LINK_TARGET}"

        DETECTED_LINK_TARGET=$(readlink -q /proc/$$/fd/9)

        # cleanup
        exec 9>&-

        umount "${MOUNTDIR}/overlayfs"
        umount ${MOUNTDIR}

        rmdir ${MOUNTDIR}

        # This overlay module does not correctly handle symlinks, so skip the
        # tests.
        if [ "${DETECTED_LINK_TARGET}" != "${CORRECT_LINK_TARGET}" ]; then
                exit 0
        fi
fi

which newuidmap >/dev/null 2>&1 || { echo "'newuidmap' command is missing" >&2; exit 1; }

DONE=0
KNOWN_RELEASES="precise trusty xenial yakkety zesty"
cleanup() {
	cd /

	run_cmd lxc-stop -n c2 -k || true
	run_cmd lxc-stop -n c1 -k || true
	pkill -u $(id -u $TUSER) -9 || true

	sed -i '/lxcunpriv/d' /run/lxc/nics /etc/lxc/lxc-usernet
	sed -i '/^lxcunpriv:/d' /etc/subuid /etc/subgid

	rm -Rf $HDIR /run/user/$(id -u $TUSER)

	deluser $TUSER

	if [ $DONE -eq 0 ]; then
		echo "FAIL"
		exit 1
	fi
	echo "PASS"
}

run_cmd() {
	sudo -i -u $TUSER \
	    env http_proxy=${http_proxy:-} https_proxy=${https_proxy:-} \
	        XDG_RUNTIME_DIR=/run/user/$(id -u $TUSER) $*
}

# create a test user
TUSER=lxcunpriv
HDIR=/home/$TUSER

ARCH=i386
if type dpkg >/dev/null 2>&1; then
	ARCH=$(dpkg --print-architecture)
fi

trap cleanup EXIT SIGHUP SIGINT SIGTERM
set -eu

id $TUSER &> /dev/null && deluser -q --remove-home $TUSER
useradd $TUSER

mkdir -p $HDIR
echo "$TUSER veth lxcbr0 2" >> /etc/lxc/lxc-usernet
sed -i '/^lxcunpriv:/d' /etc/subuid /etc/subgid

usermod -v 910000-919999 -w 910000-919999 $TUSER

mkdir -p $HDIR/.config/lxc/
cat > $HDIR/.config/lxc/default.conf << EOF
lxc.net.0.type = veth
lxc.net.0.link = lxcbr0
lxc.idmap = u 0 910000 9999
lxc.idmap = g 0 910000 9999
EOF
chown -R $TUSER: $HDIR

mkdir -p /run/user/$(id -u $TUSER)
chown -R $TUSER: /run/user/$(id -u $TUSER)

cd $HDIR

if which cgm >/dev/null 2>&1; then
	cgm create all $TUSER
	cgm chown all $TUSER $(id -u $TUSER) $(id -g $TUSER)
	cgm movepid all $TUSER $$
elif [ -e /sys/fs/cgroup/cgmanager/sock ]; then
	for d in $(cut -d : -f 2 /proc/self/cgroup); do
		dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
			--type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.Create \
			string:$d string:$TUSER >/dev/null

		dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
			--type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.Chown \
			string:$d string:$TUSER int32:$(id -u $TUSER) int32:$(id -g $TUSER) >/dev/null

		dbus-send --print-reply --address=unix:path=/sys/fs/cgroup/cgmanager/sock \
			--type=method_call /org/linuxcontainers/cgmanager org.linuxcontainers.cgmanager0_0.MovePid \
			string:$d string:$TUSER int32:$$ >/dev/null
	done
else
	for d in /sys/fs/cgroup/*; do
		[ "$d" = "/sys/fs/cgroup/unified" ] && continue
		[ -f $d/cgroup.clone_children ] && echo 1 > $d/cgroup.clone_children
		[ ! -d $d/lxctest ] && mkdir $d/lxctest
		chown -R $TUSER: $d/lxctest
		echo $$ > $d/lxctest/tasks
	done
fi

# default release is trusty, or the systems release if recognized
release=trusty
if [ -f /etc/lsb-release ]; then
    . /etc/lsb-release
    rels=$(ubuntu-distro-info --supported 2>/dev/null) ||
        rels="$KNOWN_RELEASES"
    for r in $rels; do
        [ "$DISTRIB_CODENAME" = "$r" ] && release="$r"
    done
fi

# Copy the download template cache if available
run_cmd mkdir -p $HDIR/.cache/lxc
[ -d /var/cache/lxc/download ] && \
    cp -R /var/cache/lxc/download $HDIR/.cache/lxc && \
    chown -R $TUSER: $HDIR/.cache/lxc

run_cmd lxc-create -t download -n c1 -- -d ubuntu -r $release -a $ARCH

# Make sure we can start it - twice

for count in `seq 1 2`; do
    run_cmd lxc-start -n c1 -d

    p1=$(run_cmd lxc-info -n c1 -p -H)
    [ "$p1" != "-1" ] || { echo "Failed to start container c1 (run $count)"; false; }

    run_cmd lxc-info -n c1
    run_cmd lxc-attach -n c1 -- /bin/true

    run_cmd lxc-stop -n c1 -k
done

run_cmd lxc-copy -s -n c1 -N c2
run_cmd lxc-start -n c2 -d
p1=$(run_cmd lxc-info -n c2 -p -H)
[ "$p1" != "-1" ] || { echo "Failed to start container c2"; false; }

run_cmd lxc-stop -n c2 -k

if which cgm >/dev/null 2>&1; then
    echo "Testing containers under different cgroups per subsystem"
    run_cmd cgm create freezer x1/x2
    cgm movepid freezer x1 $$
    run_cmd lxc-start -n c1 -d
    p1=$(run_cmd lxc-info -n c1 -p -H)
    [ "$p1" != "-1" ] || { echo "Failed to start container c1"; false; }
    run_cmd lxc-info -n c1
    run_cmd lxc-attach -n c1 -- /bin/true
    run_cmd lxc-cgroup -n c1 freezer.state

    echo "Testing lxc-attach and lxc-cgroup from different cgroup"
    cgm movepid freezer x2 $$
    run_cmd lxc-attach -n c1 -- /bin/true
    run_cmd lxc-cgroup -n c1 freezer.state
    run_cmd lxc-cgroup -n c1 memory.limit_in_bytes
fi

DONE=1