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31611cea8f
More complex tests often have to spawn a background process,
like a server which will respond to requests or tcpdump.
Add support for creating such processes using the with keyword:
with bkg("my-daemon", ..):
# my-daemon is alive in this block
My initial thought was to add this support to cmd() directly
but it runs the command in the constructor, so by the time
we __enter__ it's too late to make sure we used "background=True".
Second useful helper transplanted from net_helper.sh is
wait_port_listen().
The test itself uses socat, which insists on v6 addresses
being wrapped in [], it's not the only command which requires
this format, so add the wrapped address to env. The hope
is to save test code from checking if address is v6.
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240420025237.3309296-7-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>