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3920ad95f6
The guestfs_write call can be used to create small files with arbitrary 8 bit content, including \0 bytes. This replaces and deprecates write-file, which cannot be modified to use BufferIn because of an unfortunate choice in the ABI: the size parameter to write-file, if zero, means that the daemon tries to calculate the length of the buffer using strlen. However this fails if we pass a zero-length buffer using BufferIn because then the daemon tries to do strlen on a (really) zero length buffer, not even containing a terminating \0 character, thus segfaulting.