Use 'swtpm --help | grep cuse' to determine whether CUSE interface
is supported and CUSE related tests need to run. Make sure that
SWTPM_EXE is available when test_cuse is sourced.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Restrict the opening of the CUSE device to one single file descriptor. We
can modify the CUSE TPM in this way since the kernel's /dev/tpm0 cannot be
opened multiple times, either, and the CUSE TPM should behave in the same
way.
Adjust test the partial reads case to only open CUSE device file once by
using a python program. Close the open file descriptor 100 before using
swtpm_ioctl to avoid failures.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This patch adds support for partial reads to the CUSE swtpm.
We introduce a ptm_read_offset variable that holds the offset where to read
from next. It is reset every time a command has been processed as part of a
write() so that subsequent read()s start reading from offset 0. It is
advanced by the number of bytes that were read.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
