From: Mark Wooding <mdw@distorted.org.uk>
Date: Fri, 20 Jan 2012 01:23:41 +0000 (+0000)
Subject: server/tests.at: Work around strace's attempt to overwrite core files.
X-Git-Tag: 1.0.0pre11~43
X-Git-Url: https://git.distorted.org.uk/~mdw/tripe/commitdiff_plain/96f1fb578dec42612157bbf55253c85ac4793073

server/tests.at: Work around strace's attempt to overwrite core files.

When strace sees its child process die from a signal, it sends itself
the same signal in order to propagate the exit status accurately.
Unfortunately, if the child process left a core dump, it gets
overwritten by a useless core dump showing how strace committed suicide.

Work around this by running strace in a subdirectory and getting the
child process to run back in the parent.

Also see Debian bug #656389.
---

diff --git a/server/tests.at b/server/tests.at
index 4fcd9cd2..188d6504 100644
--- a/server/tests.at
+++ b/server/tests.at
@@ -70,11 +70,19 @@ while test ! -r $1/server-status && test ! -S $1/admin; do :; done
 ## Test body...
 $3
 
-## End of the test, now run the server.
+## End of the test, now run the server.  There's an awful hack here.  If a
+## process running under strace exits with a signal, then strace will kill
+## itself with the same signal -- and therefore clobber the original
+## process's core file.  So we arrange to run strace in one directory and
+## have the child process run in another.
 ) && :; } | {
   cd $1
+  mkdir -p strace-hack/
   echo TRIPE $2 >&2
-  strace -f -o tripe.trace TRIPE $2 >server-output 2>server-errors
+  (cd strace-hack/
+   ulimit -c hard >/dev/null 2>&1
+   strace -f -o ../tripe.trace \
+     TRIPE -d.. $2 >../server-output 2>../server-errors)
   stat=$?
   echo $stat >server-status
   if test $stat -ne 0; then