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When running unprivileged, lxc-create will touch a fstab file, with bind-mounts for the ttys and other devices. Add this entry in the container config. Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
397 lines
9.7 KiB
Bash
397 lines
9.7 KiB
Bash
#!/bin/bash
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#
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# lxc: linux Container library
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# Authors:
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# Daniel Lezcano <daniel.lezcano@free.fr>
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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LXC_MAPPED_UID=
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LXC_MAPPED_GID=
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# Make sure the usual locations are in PATH
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export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
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am_in_userns() {
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[ -e /proc/self/uid_map ] || { echo no; return; }
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[ "$(wc -l /proc/self/uid_map | awk '{ print $1 }')" -eq 1 ] || { echo yes; return; }
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line=$(awk '{ print $1 " " $2 " " $3 }' /proc/self/uid_map)
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[ "$line" = "0 0 4294967295" ] && { echo no; return; }
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echo yes
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}
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in_userns=0
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[ $(am_in_userns) = "yes" ] && in_userns=1
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install_busybox()
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{
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rootfs=$1
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name=$2
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res=0
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tree="\
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$rootfs/selinux \
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$rootfs/dev \
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$rootfs/home \
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$rootfs/root \
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$rootfs/etc \
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$rootfs/etc/init.d \
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$rootfs/bin \
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$rootfs/usr/bin \
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$rootfs/sbin \
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$rootfs/usr/sbin \
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$rootfs/proc \
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$rootfs/sys \
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$rootfs/mnt \
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$rootfs/tmp \
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$rootfs/var/log \
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$rootfs/usr/share/udhcpc \
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$rootfs/dev/pts \
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$rootfs/dev/shm \
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$rootfs/lib \
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$rootfs/usr/lib \
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$rootfs/lib64 \
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$rootfs/usr/lib64"
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mkdir -p $tree || return 1
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chmod 755 $tree || return 1
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pushd $rootfs/dev > /dev/null || return 1
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# minimal devices needed for busybox
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if [ $in_userns -eq 1 ]; then
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for dev in tty console tty0 tty1 tty5 ram0 null urandom; do
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touch $rootfs/dev/$dev
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echo "/dev/$dev dev/$dev none bind 0 0" >> $path/fstab
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done
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else
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mknod -m 666 tty c 5 0 || res=1
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mknod -m 666 console c 5 1 || res=1
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mknod -m 666 tty0 c 4 0 || res=1
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mknod -m 666 tty1 c 4 0 || res=1
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mknod -m 666 tty5 c 4 0 || res=1
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mknod -m 600 ram0 b 1 0 || res=1
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mknod -m 666 null c 1 3 || res=1
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mknod -m 666 zero c 1 5 || res=1
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mknod -m 666 urandom c 1 9 || res=1
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fi
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popd > /dev/null
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# root user defined
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cat <<EOF >> $rootfs/etc/passwd
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root:x:0:0:root:/root:/bin/sh
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EOF
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cat <<EOF >> $rootfs/etc/group
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root:x:0:root
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EOF
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# mount everything
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cat <<EOF >> $rootfs/etc/init.d/rcS
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#!/bin/sh
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/bin/syslogd
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/bin/mount -a
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/bin/udhcpc
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EOF
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# executable
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chmod 744 $rootfs/etc/init.d/rcS || return 1
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# mount points
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cat <<EOF >> $rootfs/etc/fstab
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shm /dev/shm tmpfs defaults 0 0
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EOF
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# writable and readable for other
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chmod 644 $rootfs/etc/fstab || return 1
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# launch rcS first then make a console available
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# and propose a shell on the tty, the last one is
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# not needed
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cat <<EOF >> $rootfs/etc/inittab
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::sysinit:/etc/init.d/rcS
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tty1::respawn:/bin/getty -L tty1 115200 vt100
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console::askfirst:/bin/sh
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EOF
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# writable and readable for other
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chmod 644 $rootfs/etc/inittab || return 1
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cat <<EOF >> $rootfs/usr/share/udhcpc/default.script
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#!/bin/sh
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case "\$1" in
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deconfig)
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ip addr flush dev \$interface
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;;
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renew|bound)
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# flush all the routes
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if [ -n "\$router" ]; then
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ip route del default 2> /dev/null
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fi
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# check broadcast
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if [ -n "\$broadcast" ]; then
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broadcast="broadcast \$broadcast"
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fi
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# add a new ip address
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ip addr add \$ip/\$mask \$broadcast dev \$interface
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if [ -n "\$router" ]; then
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ip route add default via \$router dev \$interface
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fi
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[ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf
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for i in \$dns ; do
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echo nameserver \$i >> /etc/resolv.conf
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done
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;;
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esac
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exit 0
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EOF
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chmod 744 $rootfs/usr/share/udhcpc/default.script
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return $res
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}
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configure_busybox()
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{
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rootfs=$1
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which busybox >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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echo "busybox executable is not accessible"
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return 1
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fi
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file -L $(which busybox) | grep -q "statically linked"
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if [ $? -ne 0 ]; then
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echo "warning : busybox is not statically linked."
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echo "warning : The template script may not correctly"
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echo "warning : setup the container environment."
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fi
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# copy busybox in the rootfs
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cp $(which busybox) $rootfs/bin
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if [ $? -ne 0 ]; then
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echo "failed to copy busybox in the rootfs"
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return 1
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fi
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# symlink busybox for the commands it supports
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# it would be nice to just use "chroot $rootfs busybox --install -s /bin"
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# but that only works right in a chroot with busybox >= 1.19.0
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pushd $rootfs/bin > /dev/null || return 1
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./busybox --help | grep 'Currently defined functions:' -A300 | \
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grep -v 'Currently defined functions:' | tr , '\n' | \
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xargs -n1 ln -s busybox
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popd > /dev/null
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# relink /sbin/init
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ln $rootfs/bin/busybox $rootfs/sbin/init
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# passwd exec must be setuid
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chmod +s $rootfs/bin/passwd
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touch $rootfs/etc/shadow
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# setting passwd for root
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CHPASSWD_FILE=$rootfs/root/chpasswd.sh
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cat <<EOF >$CHPASSWD_FILE
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echo "setting root password to \"root\""
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mount -n --bind /lib $rootfs/lib
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if [ \$? -ne 0 ]; then
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echo "Failed bind-mounting /lib at $rootfs/lib"
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exit 1
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fi
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chroot $rootfs chpasswd <<EOFF 2>/dev/null
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root:root
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EOFF
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if [ \$? -ne 0 ]; then
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echo "Failed to change root password"
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exit 1
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fi
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umount $rootfs/lib
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EOF
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lxc-unshare -s MOUNT -- /bin/sh < $CHPASSWD_FILE
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rm $CHPASSWD_FILE
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# add ssh functionality if dropbear package available on host
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which dropbear >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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# copy dropbear binary
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cp $(which dropbear) $rootfs/usr/sbin
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if [ $? -ne 0 ]; then
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echo "Failed to copy dropbear in the rootfs"
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return 1
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fi
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# make symlinks to various ssh utilities
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utils="\
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$rootfs/usr/bin/dbclient \
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$rootfs/usr/bin/scp \
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$rootfs/usr/bin/ssh \
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$rootfs/usr/sbin/dropbearkey \
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$rootfs/usr/sbin/dropbearconvert \
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"
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echo $utils | xargs -n1 ln -s /usr/sbin/dropbear
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# add necessary config files
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mkdir $rootfs/etc/dropbear
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dropbearkey -t rsa -f $rootfs/etc/dropbear/dropbear_rsa_host_key > /dev/null 2>&1
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dropbearkey -t dss -f $rootfs/etc/dropbear/dropbear_dss_host_key > /dev/null 2>&1
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echo "'dropbear' ssh utility installed"
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fi
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return 0
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}
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copy_configuration()
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{
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path=$1
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rootfs=$2
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name=$3
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grep -q "^lxc.rootfs" $path/config 2>/dev/null || echo "lxc.rootfs = $rootfs" >> $path/config
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cat <<EOF >> $path/config
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lxc.haltsignal = SIGUSR1
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lxc.utsname = $name
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lxc.tty = 1
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lxc.pts = 1
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lxc.cap.drop = sys_module mac_admin mac_override sys_time
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# When using LXC with apparmor, uncomment the next line to run unconfined:
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#lxc.aa_profile = unconfined
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EOF
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libdirs="\
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lib \
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usr/lib \
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lib64 \
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usr/lib64"
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for dir in $libdirs; do
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if [ -d "/$dir" ] && [ -d "$rootfs/$dir" ]; then
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echo "lxc.mount.entry = /$dir $dir none ro,bind 0 0" >> $path/config
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fi
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done
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echo "lxc.mount.entry = /sys/kernel/security sys/kernel/security none ro,bind,optional 0 0" >>$path/config
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echo "lxc.mount.auto = proc:mixed sys" >>$path/config
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if [ -f "$path/fstab" ]; then
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echo "lxc.mount = $path/fstab" >>$path/config
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fi
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}
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remap_userns()
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{
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path=$1
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if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
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chown $LXC_MAPPED_UID $path/config $path/fstab >/dev/null 2>&1
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chown -R root $path/rootfs >/dev/null 2>&1
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fi
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if [ -n "$LXC_MAPPED_GID" ] && [ "$LXC_MAPPED_GID" != "-1" ]; then
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chgrp $LXC_MAPPED_GID $path/config $path/fstab >/dev/null 2>&1
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chgrp -R root $path/rootfs >/dev/null 2>&1
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fi
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}
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usage()
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{
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cat <<EOF
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$1 -h|--help -p|--path=<path>
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EOF
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return 0
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}
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options=$(getopt -o hp:n: -l help,rootfs:,path:,name:,mapped-uid:,mapped-gid: -- "$@")
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if [ $? -ne 0 ]; then
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usage $(basename $0)
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exit 1
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fi
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eval set -- "$options"
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while true
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do
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case "$1" in
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-h|--help) usage $0 && exit 0;;
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-p|--path) path=$2; shift 2;;
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--rootfs) rootfs=$2; shift 2;;
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-n|--name) name=$2; shift 2;;
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--mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
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--mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
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--) shift 1; break ;;
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*) break ;;
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esac
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done
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if [ "$(id -u)" != "0" ]; then
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echo "This script should be run as 'root'"
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exit 1
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fi
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if [ -z "$path" ]; then
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echo "'path' parameter is required"
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exit 1
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fi
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# detect rootfs
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config="$path/config"
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if [ -z "$rootfs" ]; then
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if grep -q '^lxc.rootfs' $config 2>/dev/null ; then
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rootfs=$(awk -F= '/^lxc.rootfs =/{ print $2 }' $config)
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else
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rootfs=$path/rootfs
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fi
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fi
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install_busybox $rootfs $name
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if [ $? -ne 0 ]; then
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echo "failed to install busybox's rootfs"
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exit 1
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fi
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configure_busybox $rootfs
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if [ $? -ne 0 ]; then
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echo "failed to configure busybox template"
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exit 1
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fi
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copy_configuration $path $rootfs $name
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if [ $? -ne 0 ]; then
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echo "failed to write configuration file"
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exit 1
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fi
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remap_userns $path
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if [ $? -ne 0 ]; then
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echo "failed to remap files to user"
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exit 1
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fi
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