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These set or get the program name in the handle. Most programs will never need to call this, since we set this, if possible, using the glibc 'program_invocation_short_name(3)' feature.
This is a test tool, not a comprehensive test, but a "does it basically function" test, which can be packaged and given to end users. It also collects and prints a lot of internal debug information, which is useful in bug reports to track down appliance / qemu boot problems. For more information, please read the man page libguestfs-test-tool(1).