utils: Add cmdline_shebang_wrapper util.

Useful to work around shebang relocation issues, where
shebangs are too long or have arguments in them, thus preventing them
from using the /usr/bin/env shebang.

(From OE-Core rev: 6edc1fffcbe1405d8c309a75643d7d6cd9a92848)

Signed-off-by: Paulo Neves <ptsneves@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/utils.bbclass

@@ -184,6 +184,40 @@ END
 	chmod +x $cmd
 }
 
+create_cmdline_shebang_wrapper () {
+	# Create a wrapper script where commandline options are needed
+	#
+	# These are useful to work around shebang relocation issues, where shebangs are too
+  # long or have arguments in them, thus preventing them from using the /usr/bin/env
+	# shebang
+	#
+	# Usage: create_cmdline_wrapper FILENAME <extra-options>
+
+	cmd=$1
+	shift
+
+	echo "Generating wrapper script for $cmd"
+
+  # Strip #! and get remaining interpreter + arg
+  argument="$(basename "$(head -n1 $cmd | sed -e 's|#![ ]*||g' )")"
+  # strip the shebang from the real script as we do not want it to be usable anyway
+  tail -n +2 $cmd > $cmd.real
+	cmdname=$(basename $cmd)
+	dirname=$(dirname $cmd)
+	cmdoptions=$@
+	if [ "${base_prefix}" != "" ]; then
+		relpath=`python3 -c "import os; print(os.path.relpath('${D}${base_prefix}', '$dirname'))"`
+		cmdoptions=`echo $@ | sed -e "s:${base_prefix}:\\$realdir/$relpath:g"`
+	fi
+	cat <<END >$cmd
+#!/usr/bin/env bash
+realpath=\`readlink -fn \$0\`
+realdir=\`dirname \$realpath\`
+exec -a \$realdir/$cmdname $argument \$realdir/$cmdname.real $cmdoptions "\$@"
+END
+	chmod +x $cmd
+}
+
 create_wrapper () {
 	# Create a wrapper script where extra environment variables are needed
 	#