[openssh-commits] [openssh] 01/01: Improve compatibility of early exit trap handling.

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dtucker pushed a commit to branch master
in repository openssh.

commit 2e5cfed513e84444483baf1d8b31c40072b05103
Author: Darren Tucker <dtucker at dtucker.net>
Date:   Thu Jan 20 13:26:27 2022 +1100

    Improve compatibility of early exit trap handling.
    
    Dash (as used by the github runners) has some differences in its trap
    builtin:
     - it doesn't have -p (which is fine, that's not in posix).
     - it doesn't work in a subshell (which turns out to be in compliance
       with posix, which means bash isn't).
     - it doesn't work in a pipeline, ie "trap|cat" produces no output.
---
 regress/test-exec.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/regress/test-exec.sh b/regress/test-exec.sh
index 7aeead5c..15bdd084 100644
--- a/regress/test-exec.sh
+++ b/regress/test-exec.sh
@@ -724,10 +724,15 @@ if [ "x$USE_VALGRIND" != "x" ]; then
 	# their logs, but since the EXIT traps are not invoked until
 	# test-exec.sh exits, waiting here will deadlock.
 	# This is not very portable but then neither is valgrind itself.
-	exithandler=$(trap -p | awk -F "'" '/EXIT$/{print $2}')
+	# As a bonus, dash (as used on the runners) has a "trap" that doesn't
+	# work in a pipeline (hence the temp file) or a subshell.
+	exithandler=""
+	trap >/tmp/trap.$$ && exithandler=$(cat /tmp/trap.$$ | \
+	    awk -F "'" '/EXIT$/{print $2}')
+	rm -f /tmp/trap.$$
 	if [ "x${exithandler}" != "x" ]; then
 		verbose invoking EXIT trap handler early: ${exithandler}
-		${exithandler}
+		eval "${exithandler}"
 		trap '' EXIT
 	fi
 

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