X-Git-Url: http://git.onelab.eu/?p=sliceimage.git;a=blobdiff_plain;f=bin%2Flxc-sliceimage;fp=bin%2Flxc-sliceimage;h=51ff6597b08f30e1d67d1339a4ad956fe7f3f5c4;hp=0000000000000000000000000000000000000000;hb=2a061d4cdf91279d1a72c1c07cad94da519b744e;hpb=e7ad727221575d4adb262862b0823e985e679fb9

diff --git a/bin/lxc-sliceimage b/bin/lxc-sliceimage
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+#!/bin/bash
+#
+# chkconfig: 345 20 80
+# description: Create BTRFS subvolumes for LXC reference images.
+#
+# Thierry Parmentelat <thierry.parmentelat@inria.fr>
+# Copyright (C) 2012 INRIA
+#
+
+# not needed -- Source function library
+#. /etc/init.d/functions
+
+# a f>=18 root context won't have /bin nor /sbin in its path, which is where
+# chkconfig is located on f<=14 images
+export PATH=$PATH:/bin:/sbin
+
+# This is where sliceimage(s) rpms store their reference images
+sliceimage_dir=/vservers/.vref
+sliceimage_stubs=/vservers/.vstub
+lxc_dir=/vservers/.lvref
+tmp_dir=/vservers/.ltmp
+
+# Check if we are in the build environment
+function check_node () {
+    mount | grep -q 'planetlab-vservers' || exit 0
+    [ -d $sliceimage_dir ] || { echo "No sliceimage installed" ; exit 1; }
+}
+
+function start () {
+
+    echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+    echo "lxc-sliceimage: starting on $(date)"
+
+    check_node
+    
+    mkdir -p $lxc_dir
+
+    slicefamilies=$(cd $sliceimage_dir ; ls )
+
+    for slicefamily in $slicefamilies; do
+	echo ==================== $slicefamily
+	# initialize if needed
+	[ -d $lxc_dir/$slicefamily ] || { 
+	    echo "creating btrfs subvolume" ; 
+	    btrfs subvolume create $lxc_dir/$slicefamily ;
+	}
+        # xxx what is that ?
+	#btrfs subvolume create $lxc_dir/lxc-squeeze-x86_64
+        # copy the slice image into the btrfs ?
+#	echo "============================== mirroring start $(date)"
+	echo "$sliceimage_dir/$slicefamily/ onto btrfs subvolume $lxc_dir/$slicefamily/"
+	# mention --delete for rpm updates
+	# we want to keep only our own additions, that will be re-created in the remaining 
+	# of this script anyway
+	rsync -a --delete $sliceimage_dir/$slicefamily/ $lxc_dir/$slicefamily/ 
+#	echo "============================== mirroring done $(date)"
+	# adapting slice images to the node virtualization mode can unfortunately
+	# not be done at build-time since we do not know that yet
+	patch_lvref $lxc_dir/$slicefamily
+    done
+
+    # create ref images from stubs
+    unfold_system_slices
+
+    echo "lxc-sliceimage: done on $(date)"
+    echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+}
+
+function status () {
+    echo -n "Checking node .. "
+    check_node
+    echo OK
+    echo "From installed sliceimage variants"
+    ls $sliceimage_dir
+    echo "Exported to lxc"
+    ls $lxc_dir
+}
+
+# prefer to use e.g.
+# sed -i $rootfs/etc/sudoers
+# rather than
+# chroot $rootfs sed -i /etc/sudoers
+# because the latter has sed issue weird messages like
+# sed: warning: failed to get security context of ...
+function patch_lvref () {
+    rootfs=$1; shift
+
+    echo "patch_lvref : handling $rootfs"
+    
+    # Allow a user who logins via ssh to sudo
+    sed -i 's/^Defaults\ *requiretty/\#&/' $rootfs/etc/sudoers
+    # Allow to login at virsh console. loginuid.so doen't work in the absence of auditd
+    # which cannot run inside a container.
+    sed -i 's/^.*loginuid.so.*$/\#&/' $rootfs/etc/pam.d/login
+    # Enable eth0 on bootup
+    cat <<EOF > $rootfs/etc/sysconfig/network-scripts/ifcfg-eth0
+DEVICE=eth0
+BOOTPROTO=dhcp
+ONBOOT=yes
+EOF
+    # Tweak sshd configuration - not all slice images have sshd preinstalled
+    if [ -f $rootfs/etc/ssh/sshd_config ] ; then
+	sed -e 's/^UsePAM\ *yes/\#&/' \
+	    -e 's/^GSSAPIAuthentication.*$/GSSAPIAuthentication no/' \
+	    -e 's/^PasswordAuthentication.*$/PasswordAuthentication no/' \
+	    -i $rootfs/etc/ssh/sshd_config
+    fi
+    # Allow root to login at virsh console
+    echo "pts/0" >> $rootfs/etc/securetty
+    # our image does not have NetworkManager, only network, and it is off by default
+    chroot $rootfs chkconfig network on
+
+    # this will run only if the rootfs seems to be systemd-based
+    patch_lvref_systemd $rootfs
+}
+
+# beware that patch_lvref_systemd will return early on non systemd-powered images
+# inspired from https://gist.github.com/1142202
+ETC=/etc/systemd/system
+LIB=/lib/systemd/system
+
+function patch_lvref_systemd () {
+    rootfs=$1; shift
+
+    absetc=$rootfs/$ETC
+    abslib=$rootfs/$LIB
+
+    # this applies to systemd only
+    [ -d $abslib ] || return
+
+    # stay away from trouble, avoid chroot'ing for straightforward stuff
+    echo "patch_lvref_systemd: handling $rootfs"
+    # sliceimage comes with graphical.target as default
+    ln -sf $LIB/multi-user.target $absetc/default.target
+    # sysinit.target seems to stick on boot, so disable it. However, we need
+    # systemd-tmpfiles-setup.service that was started by the dependency of
+    # sysinit.target to boot up correctly, so start it instead.
+    cp $abslib/basic.target $absetc/basic.target
+    sed -e 's/sysinit.target/systemd-tmpfiles-setup.service/' -i $absetc/basic.target
+    # Stop starting sysinit.target. Symlinking one to /dev/null is a standard way
+    # to disable a target (or a service and others).
+    ln -sf /dev/null $absetc/sysinit.target
+    # is also a cause of stuck on boot
+    ln -sf /dev/null $absetc/udev-settle.service
+    # It prevents systemd-tmpfiles-setup.service from starting
+    ln -sf /dev/null $absetc/fedora-readonly.service
+    # Libvirt lxc provides only tty1
+    rm -f $absetc/getty.target.wants/getty\@tty{2,3,4,5,6}.service
+    # It launches sulogin on console(tty1) but it interferes getty@tty1
+    ln -sf /dev/null $absetc/console-shell.service
+    # Workarounds for libvirt 0.9.4. Without this, getty@tty1 doen't launch
+    # because a trigger event on tty1 doesn't happen.
+    cp $abslib/getty\@.service $absetc/getty\@.service
+    sed -e 's/^BindTo/\#&/' -i $absetc/getty\@.service
+    ln -sf $ETC/getty\@.service $absetc/getty.target.wants/getty\@tty1.service
+
+}
+
+function unfold_system_slices () {
+    for clonedstamp in $sliceimage_stubs/*/*.cloned; do
+	unfold_system_slice_from_cloned $clonedstamp
+    done
+}
+
+# untested - how does this behave when updating the slice reference image ?
+# OTOH system slices probably already run at update-time 
+# so it's kind of too late anyways
+function unfold_system_slice_from_cloned () {
+    clonedstamp=$1; shift
+    # e.g. NAME=planetflow
+    NAME=$(basename $clonedstamp .cloned)
+    DIR=$(dirname $clonedstamp)
+    # e.g. SLICEFAMILY=planetlab-f8-i386
+    SLICEFAMILY=$(cat $clonedstamp)
+    # deduce the actual name used in .vref by replacing the first part of slice-family 
+    # (pldistro) with the slice name
+    # e.g. VREFNAME=planetflow-f8-i386
+    VREFNAME=$(echo $SLICEFAMILY | sed -e "s,^[^-]*-,$NAME-,")
+
+    VREFPATH="$lxc_dir/$VREFNAME"
+
+    # do not redo existing vref's unless force is mentioned
+    [ -z "$FORCE" -a -d "$VREFPATH" ] && {
+	echo "unfold_system_slice_from_cloned : $VREFPATH looks fine" ;
+	return ;
+    }
+    [ -z "$FORCE" ] && message=Building
+    [ -n "$FORCE" ] && message=Force-building
+
+    # Copy base reference image
+    echo -n $"$message slice image for $NAME in $VREFNAME: "
+
+    # build the systemslice from the one it was originally cloned from
+    FAMILYREF="$lxc_dir/$SLICEFAMILY"
+    if [ ! -d "$FAMILYREF" ] ; then
+	echo system slice from $clonedstamp - could not find reference $FAMILYREF - skipped
+	return
+    fi
+    
+    # safe side
+    mkdir -p "$lxc_dir"
+    # cleanup reference image if already exists
+    [ -d "$VREFPATH" ] && btrfs subvolume delete "$VREFPATH"
+    # extra safe
+    [ -d "$VREFPATH" ] && rm -rf "$VREFPATH"
+
+    # clone subvolume
+    btrfs subvolume snapshot $FAMILYREF $VREFPATH
+    
+    # merge the stub with the reference to get the system slice
+    (cd "$DIR/$NAME"/ && find . | cpio -m -d -u -p "$VREFPATH"/) || \
+	{ echo "Could not apply stub $DIR/$NAME - skipping $clonedstamp" ; btrfs subvolume delete "$VREFPATH" ; return ; }
+
+    # Clean RPM state
+    rm -f "$VREFPATH/var/lib/rpm/__db"*
+
+    echo Done
+}
+
+# run with the --tty option to see results, otherwise get that logged
+case "$1" in
+    --tty) shift;;
+    *) exec >> /var/log/lxc-sliceimage.log 2>&1 ;;
+esac
+
+case "$1" in
+    start|restart|reload)	start ; exit 0 ;;
+    status)			status ; exit 0 ;;
+    stop)			exit 0 ;;
+    *)  echo $"Usage: $0 [--tty] {start|stop|status}"
+        exit 1
+        ;;
+esac