test: Add log file tests for pasta plus corresponding layout and setup

To test log files on a tmpfs mount, we need to unshare the mount
namespace, which means using a context for the passt pane is not
really practical at the moment, as we can't open a shell there, so
we would have to encapsulate all the commands under 'unshare -rUm',
plus the "inner" pasta command, running in turn a tcp_rr server.

It might be worth fixing this by e.g. detecting we are trying to
spawn an interactive shell and adding a special path in the context
setup with some form of stdin redirection -- I'm not sure it's doable
though.

For this reason, add a new layout, using a context only for the host
pane, while keeping the old command dispatch mechanism for the passt
pane.

We also need a new setup function that doesn't start pasta: we want
to start and restart it with different options.

Further, we need a 'pint' directive, to send an interrupt to the
passt pane: add that in lib/test.

All the tests before the one involving tmpfs and a detached mount
namespace were also tested with the context mechanism. To make an
eventual conversion easier, pass tcp_crr directly as a command on
pasta's command line where feasible.

While at it, fix the comment to the teardown_pasta() function.

The new test set can be semi-conveniently run as:

  ./run pasta_options/log_to_file

and it checks basic log creation, size of the log file after flooding
it with debug entries, rotations, and basic consistency after
rotations, on both an existing filesystem and a tmpfs, chosen as
it doesn't support collapsing data ranges via fallocate(), hence
triggering the fall-back mechanism for logging rotation.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/test/pasta_options/log_to_file b/test/pasta_options/log_to_file
new file mode 100644
index 0000000..587bf8e
--- /dev/null
+++ b/test/pasta_options/log_to_file
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# PASST - Plug A Simple Socket Transport
+#  for qemu/UNIX domain socket mode
+#
+# PASTA - Pack A Subtle Tap Abstraction
+#  for network namespace/tap device mode
+#
+# test/pasta_options/log_to_file - Check log creation, rotations and consistency
+#
+# Copyright (c) 2022 Red Hat GmbH
+# Author: Stefano Brivio <sbrivio@redhat.com>
+
+htools	wc tcp_rr tail cut tr sort
+
+def	flood_log_server
+passtb	tcp_crr --nolog -P 10001 -C 10002 -6
+sleep	1
+endef
+
+def	flood_log_client
+host	tcp_crr --nolog -P 10001 -C 10002 -6 -c -H ::1
+endef
+
+def	check_log_size_mountns
+pout	SIZE cat __LOG_FILE__ | wc -c
+check	[ __SIZE__ -gt $((50 * 1024)) ]
+check	[ __SIZE__ -lt $((100 * 1024)) ]
+endef
+
+test	Log creation
+
+set	PORTS -t 10001,10002 -u 10001,10002
+set	LOG_FILE __STATEDIR__/pasta.log
+
+passt	./pasta -l __LOG_FILE__
+passt	exit
+check	[ -s __LOG_FILE__ ]
+
+test	Log truncated on creation
+passt	./pasta -l __LOG_FILE__
+passt	exit
+check	[ $(cat __LOG_FILE__ | wc -l) -eq 1 ]
+
+test	Maximum log size
+passtb	./pasta --config-net -d -f -l __LOG_FILE__ --log-size $((100 * 1024)) -- sh -c 'while true; do tcp_crr --nolog -P 10001 -C 10002 -6; done'
+sleep	1
+
+flood_log_client
+check	[ $(cat __LOG_FILE__ | wc -c) -gt $((50 * 1024)) ]
+check	[ $(cat __LOG_FILE__ | wc -c) -lt $((100 * 1024)) ]
+
+flood_log_client
+check	[ $(cat __LOG_FILE__ | wc -c) -gt $((50 * 1024)) ]
+check	[ $(cat __LOG_FILE__ | wc -c) -lt $((100 * 1024)) ]
+
+flood_log_client
+check	[ $(cat __LOG_FILE__ | wc -c) -gt $((50 * 1024)) ]
+check	[ $(cat __LOG_FILE__ | wc -c) -lt $((100 * 1024)) ]
+
+pint
+
+test	Timestamp consistency after rotations
+check	tail -n +2 __LOG_FILE__ | cut -f1 -d' ' | tr -d [.:] | sort -c
+
+test	Maximum log size on tmpfs (no FALLOC_FL_COLLAPSE_RANGE)
+passt	unshare -rUm
+passt	mkdir __STATEDIR__/t
+passt	mount -t tmpfs none __STATEDIR__/t
+set	LOG_FILE __STATEDIR__/t/log
+passt	./pasta --config-net -d -l __LOG_FILE__ --log-size $((100 * 1024))
+
+flood_log_server
+flood_log_client
+check_log_size_mountns
+
+flood_log_server
+flood_log_client
+check_log_size_mountns
+
+flood_log_server
+flood_log_client
+check_log_size_mountns
+
+test	Timestamp consistency after rotations (no FALLOC_FL_COLLAPSE_RANGE)
+check	tail -n +2 __LOG_FILE__ | cut -f1 -d' ' | tr -d [.:] | sort -c
+
+passt	exit
+passt	umount __STATEDIR__/t
+passt	exit