t/io: strace is optional on Linux

There are many Linux (GNU or otherwise) which do not have
strace(1) installed.

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 5f123eb422cc395be040fada143fe058f610b3b3..d587bf1054b9176a98efb15851618aae2351404b 100644 (file)
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -978,7 +978,7 @@ sub strace (@) {
                chomp $ps;
                skip "strace unusable on daemons\n$f is `$ps' (!= 0)" if $ps;
        }
-       require_cmd('strace', 1);
+       require_cmd('strace', 1) or skip 'strace not available', 1;
 }
 
 sub strace_inject (;$) {