hostap/tests/hwsim/vm/inside.sh
Johannes Berg e5a410f472 tests: Make /etc/alternatives work in VM
In recent Debian versions, ebtables is an alias managed by
the alternatives(8) mechanism. This means /usr/sbin/ebtables
is a symlink to /etc/alternatives/ebtables, which in turn
links to the real binary.

As we mount a tmpfs over /etc, we cannot access this.

Fix this by bind-mounting the real /etc to /tmp/etc and
adding a symlink from /etc/alternatives to this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2019-02-05 23:51:37 +02:00

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#!/bin/sh
# keep old /etc
mount tmpfs -t tmpfs /tmp
mkdir /tmp/etc
mount --bind /etc /tmp/etc
# mount all kinds of things
mount tmpfs -t tmpfs /etc
# we need our own /dev/rfkill, and don't want device access
mount tmpfs -t tmpfs /dev
# some sockets go into /var/run, and / is read-only
mount tmpfs -t tmpfs /var/run
mount proc -t proc /proc
mount sysfs -t sysfs /sys
# needed for tracing
mount debugfs -t debugfs /sys/kernel/debug
# for inside telnet
mkdir /dev/pts
mount devpts -t devpts /dev/pts
export PATH=/usr/sbin:$PATH
# reboot on any sort of crash
sysctl kernel.panic_on_oops=1
sysctl kernel.panic=1
# get extra command line variables from /proc/cmdline
TESTDIR=$(sed 's/.*testdir=\([^ ]*\) .*/\1/' /proc/cmdline)
TIMEWARP=$(sed 's/.*timewarp=\([^ ]*\) .*/\1/' /proc/cmdline)
EPATH=$(sed 's/.*EPATH=\([^ ]*\) .*/\1/' /proc/cmdline)
TELNET=$(sed 's/.*TELNET=\([^ ]*\) .*/\1/' /proc/cmdline)
ARGS=$(sed 's/.*ARGS=\([^ ]*\)\( \|$\).*/\1/' /proc/cmdline)
# create /dev entries we need
mknod -m 660 /dev/ttyS0 c 4 64
mknod -m 666 /dev/ptmx c 5 2
mknod -m 660 /dev/random c 1 8
mknod -m 660 /dev/urandom c 1 9
mknod -m 666 /dev/null c 1 3
mknod -m 666 /dev/kmsg c 1 11
test -f /sys/class/misc/rfkill/dev && \
mknod -m 660 /dev/rfkill c $(cat /sys/class/misc/rfkill/dev | tr ':' ' ')
ln -s /proc/self/fd/0 /dev/stdin
ln -s /proc/self/fd/1 /dev/stdout
ln -s /proc/self/fd/2 /dev/stderr
echo "VM has started up" > /dev/ttyS0
# create dummy sudo - everything runs as uid 0
mkdir /tmp/bin
cat > /tmp/bin/sudo << EOF
#!/bin/bash
exec "\$@"
EOF
chmod +x /tmp/bin/sudo
# and put it into $PATH, as well as our extra-$PATH
export PATH=/tmp/bin:$EPATH:$PATH
# some tests assume adm/admin group(s) exist(s)
cat > /etc/group <<EOF
adm:x:0:
admin:x:0:
messagebus:x:106:
EOF
# root should exist
cat > /etc/passwd <<EOF
root:x:0:0:root:/tmp:/bin/bash
messagebus:x:102:106::/var/run/dbus:/bin/false
EOF
cat > /etc/ethertypes <<EOF
IPv4 0800 ip ip4
ARP 0806 ether-arp
IPv6 86DD ip6
EOF
cat > /etc/protocols <<EOF
ip 0 IP
icmp 1 ICMP
tcp 6 TCP
udp 17 UDP
ipv6-icmp 58 IPv6-ICMP
EOF
# we may need /etc/alternatives, at least on Debian-based systems
ln -s /tmp/etc/alternatives /etc/
# local network is needed for some tests
ip link set lo up
# create logs mountpoint and mount the logshare
mkdir /tmp/logs
mount -t 9p -o trans=virtio,rw logshare /tmp/logs
# allow access to any outside directory (e.g. /tmp) we also have
mkdir /tmp/host
mount --bind / /tmp/host
if [ "$TIMEWARP" = "1" ] ; then
(
while sleep 1 ; do
date --set "@$(($(date +%s) + 19))"
done
) &
fi
echo hwsimvm > /proc/sys/kernel/hostname
echo 8 8 8 8 > /proc/sys/kernel/printk
cat > /tmp/bin/login <<EOF
#!/bin/sh
export PS1='\h:\w\$ '
exec bash
EOF
chmod +x /tmp/bin/login
if [ "$TELNET" = "1" ] ; then
ip link set eth0 up
ip addr add 172.16.0.15/24 dev eth0
which in.telnetd >/dev/null && (
while true ; do
in.telnetd -debug 23 -L /tmp/bin/login
done
) &
fi
# check if we're rebooting due to a kernel panic ...
if grep -q 'Kernel panic' /tmp/logs/console ; then
echo "KERNEL CRASHED!" >/dev/ttyS0
else
# finally run the tests
export USER=0
export LOGDIR=/tmp/logs
export DBFILE=$LOGDIR/results.db
export PREFILL_DB=y
# some tests need CRDA, install a simple uevent helper
# and preload the 00 domain it will have asked for already
echo $TESTDIR/vm/uevent.sh > /sys/kernel/uevent_helper
COUNTRY=00 crda
mkdir -p /var/run/dbus
touch /var/run/dbus/hwsim-test
chown messagebus.messagebus /var/run/dbus
dbus-daemon --config-file=$TESTDIR/vm/dbus.conf --fork
cd $TESTDIR
./run-all.sh --vm $(cat /tmp/host$ARGS) </dev/ttyS0 >/dev/ttyS0 2>&1
if test -d /sys/kernel/debug/gcov ; then
cp -ar /sys/kernel/debug/gcov /tmp/logs/
# these are broken as they're updated while being read ...
find /tmp/logs/gcov/ -wholename '*kernel/gcov/*' -print0 | xargs -0 rm
fi
#bash </dev/ttyS0 >/dev/ttyS0 2>&1
fi
# and shut down the machine again
halt -f -p