Baunsgaard commented on code in PR #2586:
URL: https://github.com/apache/systemds/pull/2586#discussion_r4066170462
##########
bin/systemds:
##########
@@ -173,6 +173,32 @@ script.
EOF
}
+# verify that $1 is a port that a server can be bound to, otherwise abort with
an error.
+# $2 names the server the port is meant for.
+function checkPort {
+ local port=$1
+ local target=$2
+ local re='^[0-9]+$'
+ if ! [[ $port =~ $re ]] ; then
+ echo "error: Port '$port' for the $target is not a number"
+ printUsage
+ exit 1
+ fi
+ # drop leading zeros, so that the length check below is not fooled by e.g.
0000080505
+ local num=$port
+ while [[ ${#num} -gt 1 && $num == 0* ]] ; do num=${num#0} ; done
+ # more than 5 digits is out of range by definition, and comparing it would
silently
+ # overflow the 64 bit integers of the shell for very long inputs
+ if [ ${#num} -gt 5 ] || [ "$num" -lt 1 ] || [ "$num" -gt 65535 ] ; then
+ echo "error: Port $port for the $target is out of range, expected a port
in [1, 65535]"
+ printUsage
+ exit 1
+ fi
+ if [ "$num" -lt 1024 ] ; then
+ echo "warning: Port $port for the $target is a reserved system port,
binding it requires elevated privileges"
+ fi
+}
+
Review Comment:
Only criticism. I am strongly against adding more logic to the systemds
file. Can we not just have the error message and verification inside Java. This
gives a single point of failure, rather than splitting the logic in two.l
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