utils: Optionally run utilities as root

In particular this fixes running pb-plugin executables from the UI since
the wrapper requires root to set up the environment.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

utils/pb-exec

@@ -1,7 +1,18 @@
 #!/bin/sh
 
+PREFIX=""
+
+# Check if root required
+if [[ "$(id -u)" != "0" ]]; then
+	read -n 1 -r -p "Running as user $(id -un), run as root? (y/N)" key
+	if [ "$key" == "y" ]; then
+		PREFIX="sudo"
+	fi
+	printf "\n"
+fi
+
 # Run a program specified by Petitboot.
-$@
+$PREFIX $@
 echo "$0 ran '$@'"
 
 # Wait for the user to exit back to Petitboot.