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That a utility function permanently changes the process environment is bad style and leads to subtle, hard to debug problems. For example, we had one oe-selftest which used runqemu() with an override for DEPLOY_DIR_IMAGE. Another test then just called runCmd() and ended up passing the wrong DEPLOY_DIR_IMAGE set earlier in os.environ. The approach used here is to pass the desired environment dict to the launch() method as a new, optional parameter, which then gets passed on to subproject.Popen(). The modified env variables do not get logged, as before. [YOCTO #11443] (From OE-Core rev: cab20f3b2fe668a63c58b44f2ad797fed74226fe) Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>