using C reaper with musl-gcc

[rrq/overlay-boot.git] / overlay-boot

diff --git a/overlay-boot b/overlay-boot
index b6e0045a11180f7e1ab5f81d423c4e871752eff4..44bc76f0ec71873e73167f347bbb988dc3533dbd 100755 (executable)
--- a/overlay-boot
+++ b/overlay-boot
@@ -1,61 +1,36 @@
 #!/bin/sh
 #
-# This boot method runs a service subhost with a root filesystem that
-# is an overlay of the subhost's root and an OS root. The service
-# subhost is defined by a configuration file named on teh command line
+# This boot scripts runs a service subhost as defined by the
+# configuration file named on the command line.
+# See "man overlay-boot" for details.
 
-[ $(id -u) = 0 ] || exec sudo $0 $@
-. $(dirname $(realpath $0))/functions $*
-CONFIG="$1"
-[ -r "$CONFIG" ] || die "Missing configuration $CONFIG"
-config NAME $(basename $1 .${1##*.})
-config LOG /tmp/oly-$NAME.log
+set -x
+PROGRAMDIR="$(dirname $(realpath $0))"
+. $PROGRAMDIR/functions
+
+subhost_name $1
 
 if [ -z "$UNSHARED" ] ; then
-    # Pre-unsharing:
-    #
-    # Create the network namespace for the subhost, then trigger
-    # detached re-run with unshared mount namespace
-    [ -r /run/netns/$NAME ] || {
+    if [ ! -r /run/netns/$NAME ] ; then
        ip netns add $NAME
-       ip netns exec $NAME ip link set lo up
-    }
+       ip netns exec $NAME ip link set lo up || exit 1
+    fi
     exec env UNSHARED=yes unshare -m $0 $@ > $LOG 2>&1 &
     echo "Logging to $LOG" >&2
     exit 0
 fi
 
-config BASE
-BASE="$(cd $(dirname $CONFIG); realpath $BASE)"
-
-config LIVE "$BASE/live"
-config UPPER "$BASE/root"
-config WORK "$BASE/work"
-config LOWER "/"
-config CABLES ""
-config START "networking ssh"
-config SUBSHELL /bin/sh
-
-# Setup virtual cabling and subhost's /etc/network/interfaces
+subhost_config
 setup_veth_cables $NAME $CABLES
-
-# Set up the mount for this subhost, including a new tmpfs on its /run
-echo setup_overlay "$NAME" "$LIVE" "$LOWER" "$UPPER" "$WORK"
 setup_overlay "$NAME" "$LIVE" "$LOWER" "$UPPER" "$WORK"
 
 exithandler() {
     ip netns del $NAME
-    umount -R "$LIVE"
+    [ "$UPPER" != "$LIVE" ] && umount -R "$LIVE"
 }
 trap "exithandler" 0
 
-CMD="unshare -fp --mount-proc ip netns exec $NAME chroot $LIVE /bin/sh"
+CMD="unshare -fp --mount-proc -i -u ip netns exec $NAME chroot $LIVE /bin/sh"
 echo "$CMD"
-
-cat <<EOF | $CMD
-set -x
-mount -t proc proc /proc
-for srv in $START ; do service \$srv start ; done
-exec /.reaper $NAME
-EOF
+env CONFIG="$CONFIG" $INIT | $CMD
 echo "EXITED $CMD"