refactor tail invokation into logtail.sh

src/scripts/logtail.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+set -eu
+
+args=$(getopt -o "" -l "follow,lines:" -n "$0" -- "$@")
+eval set -- "${args}"
+
+follow=""
+lines=""
+
+while true; do
+    case "$1" in
+    --follow) follow="--follow --retry --quiet"; shift;; # same as -F. to make it work if file doesn't exist, --quiet to not output file headers, which are no logs
+    --lines) lines="$2"; shift 2;;
+    --) break;;
+    *) echo "Unknown option $1"; exit 1;;
+    esac
+done
+
+exec tail ${follow} --lines=${lines} "$@"