Add truncate-logs.sh to tools

tools/truncate-logs.sh

+#!/bin/sh
+#
+# Usage:
+#    tools/truncate-logs.sh [node]
+#
+# Output:
+#    for each node, truncate the logs
+#
+#    If the argument "node" is specified, only truncates the logs of that
+#    node.
+#
+# Examples:
+#    tools/truncate-logs.sh
+#    tools/truncate-logs.sh 000a
+
+set -o errexit
+set -o nounset
+
+# Set some default values if the variables are not already set
+: "${CHUTNEY_DATA_DIR:=}"
+
+if [ ! -d "$CHUTNEY_PATH" ] || [ ! -x "$CHUTNEY_PATH/chutney" ]; then
+    # looks like a broken path: use the path to this tool instead
+    TOOLS_PATH=$(dirname "$0")
+    CHUTNEY_PATH=$(dirname "$TOOLS_PATH")
+    export CHUTNEY_PATH
+fi
+if [ -d "$PWD/$CHUTNEY_PATH" ] && [ -x "$PWD/$CHUTNEY_PATH/chutney" ]; then
+    # looks like a relative path: make chutney path absolute
+    export CHUTNEY_PATH="$PWD/$CHUTNEY_PATH"
+fi
+
+# Get a working net path
+case "$CHUTNEY_DATA_DIR" in
+  /*)
+    # if an absolute path, then leave as-is
+    # chutney will make this directory automatically if needed
+    ;;
+  *)
+    # if a relative path
+    if [ ! -d "$CHUTNEY_DATA_DIR" ]; then
+        # looks like a broken path: use the chutney path as a base
+        export CHUTNEY_DATA_DIR="$CHUTNEY_PATH/net"
+    fi
+    if [ -d "$PWD/$CHUTNEY_DATA_DIR" ]; then
+        # looks like a relative path: make chutney path absolute
+        export CHUTNEY_DATA_DIR="$PWD/$CHUTNEY_DATA_DIR"
+    fi
+    ;;
+esac
+
+# Truncate the logs for node $1
+truncate_logs() {
+    echo "Truncating log: $1"
+    truncate -s 0 "$1"
+}
+
+# Show the usage message for this script
+usage() {
+    echo "Usage: $NAME [node]"
+    exit 1
+}
+
+NAME=$(basename "$0")
+DEST="$CHUTNEY_DATA_DIR/nodes"
+LOG_FILE=*.log
+
+[ -d "$DEST" ] || { echo "$NAME: no logs available in '$DEST'"; exit 1; }
+if [ $# -eq 0 ];
+then
+    for log in "$DEST"/*/$LOG_FILE;
+    do
+        [ -e "${log}" ] || continue
+        truncate_logs "$log"
+    done
+elif [ $# -eq 1 ];
+then
+    for log in "$DEST"/$1/$LOG_FILE;
+    do
+        [ -e "${log}" ] || continue
+        truncate_logs "$log"
+    done
+else
+    usage
+fi