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The event callback gets a buffer parameter which is usually something
like a log message. However as it comes from C it is not necessarily
well-formed (eg) UTF-8 but could contain any old sequence of bytes.
In the test case provided by the reporter, we failed to encode the
buffer as 'str' with this error:
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 137: unexpected end of data
Use 'bytes' instead. Strictly speaking this changes the type
signature of the callbacks, but our existing Python tests which just
print the buffer using '%s' don't fail and in any case we don't
guarantee the stability of non-C APIs.
Reported-by: Yonatan Shtarkman
See: https://listman.redhat.com/archives/libguestfs/2023-February/030653.html
(cherry picked from commit bbf396fc55)
libguestfs is a library and set of tools for accessing and modifying virtual machine (VM) disk images. This package contains the Python bindings for libguestfs.