Check ptrace_scope procfile before proceeding

Signed-off-by: Peter Engelbert <[email protected]>

debug/debug.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -eux
 
+PTRACE_SCOPE_PROCFILE="/proc/sys/kernel/yama/ptrace_scope"
+
 if [ -z "$(command -v socat)" ]; then
     echo you must have "'socat'" installed
     exit 1
@@ -11,6 +13,16 @@ if [ -z "$(command -v pgrep)" ]; then
     exit 1
 fi
 
+if ! [ -f "$PTRACE_SCOPE_PROCFILE" ]; then
+    echo "unable to detect necessary procfile, attempting to continue..."
+fi
+
+if [ "$(<"$PTRACE_SCOPE_PROCFILE")" != "0" ]; then
+    echo "you must set ${PTRACE_SCOPE_PROCFILE} to '0':"
+    echo "echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope"
+    exit 1
+fi
+
 PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "${PROJECT_DIR}"