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|
#!/bin/sh -e
set -x
. ../common.sh
# announce a transition and terminate
trans () {
echo $1
exit
}
# is the firmware file available?
checkFw () {
[ -n "$TargetFw" -a -f "$FwDst" ] || trans idle
}
checkFwHash () {
[ "$(sha256sum <$FwDst 2>/dev/null | cut -f1 -d' ')" == "$TargetFw" ] || trans idle
}
# is target time passed but not set
checkTime () {
[ $CurTime -lt "$TargetTime" -o "$AckTime" -eq "$TargetTime" ] 2>/dev/null \
|| trans ready
}
# check all-or-nothing-invariant for whole update state table
checkPeerState() {
p2ptbl show $Tbl \
| (
IFS=$'\t'
while read OId OCurFw OTargetFw OTargetTime OAckTime; do
[ -z "$OTargetFw" -a -z "$OTargetTime" -a -z "$OAckTime" ] && continue
[ -n "$OTargetFw" -a "$OTargetTime" -eq "$OAckTime" ] && continue
exit 1
done ) || trans ready
}
case $CurState in
idle)
checkFw
checkFwHash
# ^^ check hash of firmware file once if the hash is correct;
# do not optimize for the rare case of a wrong hash or
# continuously failing updates
trans ready
;;
ready)
checkFw
checkTime
[ "$TargetTime" -gt $CurTime ] 2>/dev/null || trans ready
trans scheduled
;;
scheduled)
checkFw
checkTime
[ $CurTime -gt "$TargetTime" ] || trans scheduled
checkPeerState
trans applying
;;
*)
# anything else is illegal; especially the state "applying"
# must not be reached: during transition toward it the
# firmware is flashed and the router rebooted
echo "illegal state $CurState" >&2
exit 1
;;
esac
# default and if any case falls through
trans idle
|
