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selftests: defer: Introduce DEFER_PAUSE_ON_FAIL

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The fact that all cleanup (ideally) goes through the defer framework makes
debugging of these commands a bit tricky. However, this also gives us a
nice point to place a hook along the lines of PAUSE_ON_FAIL. When the
environment variable DEFER_PAUSE_ON_FAIL is set, and a cleanup command
results in non-zero exit status, show a bit of debuginfo and give the user
an opportunity to interrupt the execution altogether.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/2a07d24568ede6c42e4701657fa0b738e490fe59.1757004393.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2025-09-04 19:07:25 +02:00 committed by Jakub Kicinski
parent d89d3b29ce
commit ed07c8f2b8
1 changed files with 16 additions and 0 deletions
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16
tools/testing/selftests/net/lib/sh/defer.sh
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@ -1,6 +1,10 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Whether to pause and allow debugging when an executed deferred command has a
# non-zero exit code.
: "${DEFER_PAUSE_ON_FAIL:=no}"
# map[(scope_id,track,cleanup_id) -> cleanup_command]
# track={d=default | p=priority}
declare -A __DEFER__JOBS
@ -38,8 +42,20 @@ __defer__run()
local track=$1; shift
local defer_ix=$1; shift
local defer_key=$(__defer__defer_key $track $defer_ix)
local ret
eval ${__DEFER__JOBS[$defer_key]}
ret=$?
if [[ "$DEFER_PAUSE_ON_FAIL" == yes && "$ret" -ne 0 ]]; then
echo "Deferred command (track $track index $defer_ix):"
echo " ${__DEFER__JOBS[$defer_key]}"
echo "... ended with an exit status of $ret"
echo "Hit enter to continue, 'q' to quit"
read a
[[ "$a" == q ]] && exit 1
fi
unset __DEFER__JOBS[$defer_key]
}