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61 lines
1.6 KiB
61 lines
1.6 KiB
1 year ago
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#!/bin/sh
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#
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# This boot method runs a service subhost with a root filesystem that
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# is an overlay of the subhost's root and an OS root. The service
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# subhost is defined by a configuration file named on teh command line
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[ $(id -u) = 0 ] || exec sudo $0 $@
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. $(dirname $(realpath $0))/functions
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CONFIG="$1"
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[ -r "$CONFIG" ] || die "Missing configuration $CONFIG"
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config NAME $(basename $1 .${1##*.})
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config LOG /tmp/oly-$NAME.log
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if [ -z "$UNSHARED" ] ; then
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# Pre-unsharing:
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#
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# Create the network namespace for the subhost, then trigger
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# detached re-run with unshared mount namespace
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[ -r /run/netns/$NAME ] || ip netns add $NAME
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exec env UNSHARED=yes unshare -m $0 $@ > $LOG 2>&1 &
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echo "Logging to $LOG" >&2
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exit 0
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fi
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config BASE
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config LIVE "$BASE/live"
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config UPPER "$BASE/root"
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config WORK "$BASE/work"
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config LOWER "/"
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config CABLES ""
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config START "networking ssh"
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config SUBSHELL /bin/sh
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config STOP ""
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# Setup virtual cabling and subhost's /etc/network/interfaces
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setup_veth_cables $NAME $CABLES
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# Set up the mount for this subhost, including a new tmpfs on its /run
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echo setup_overlay "$NAME" "$LIVE" "$LOWER" "$UPPER" "$WORK"
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setup_overlay "$NAME" "$LIVE" "$LOWER" "$UPPER" "$WORK"
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exithandler() {
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ip netns del $NAME
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umount -R "$LIVE"
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}
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trap "exithandler" 0
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CMD="unshare -fp --mount-proc ip netns exec $NAME chroot $LIVE /bin/sh"
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echo "$CMD"
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cat <<EOF | $CMD
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set -x
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mount --bind $UPPER/run /run
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for srv in $START ; do service \$srv start ; done
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exec /.reaper $NAME
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EOF
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echo "EXITED $CMD"
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#echo "$STOP" | ip netns exec $NAME chroot $LIVE $SUBSHELL
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