mkdir 'dir1'
echo 'SUBDIRS=dir2' > 'dir1/Makefile.omk'
mkdir 'dir1/dir2'
echo '$(info INVOCATION_DIR=$(INVOCATION_DIR))' > 'dir1/dir2/Makefile.omk'
echo 'INVOCATION_DIR=dir1/dir2' > 'dir1/dir2/tmp'
echo 'INVOCATION_DIR=dir1' > 'dir1/tmp'
echo 'SUBDIRS=dir1' > 'Makefile.omk'