tests: note kevent+tmpfs failures on DragonFly <= 6.4

I forgot to set TMPDIR=/path/to/non-tmpfs again.

1 files changed, 22 insertions, 1 deletions

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 8e7eb950..f2914d09 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -24,7 +24,7 @@ BEGIN {
         @EXPORT = qw(tmpdir tcp_server tcp_connect require_git require_mods
                 run_script start_script key2sub xsys xsys_e xqx eml_load tick
                 have_xapian_compact json_utf8 setup_public_inboxes create_inbox
-                create_coderepo require_bsd
+                create_coderepo require_bsd kernel_version check_broken_tmpfs
                 quit_waiter_pipe wait_for_eof
                 tcp_host_port test_lei lei lei_ok $lei_out $lei_err $lei_opt
                 test_httpd xbail require_cmd is_xdeeply tail_f
@@ -37,6 +37,27 @@ BEGIN {
         push @EXPORT, @methods;
 }
 
+sub kernel_version () {
+        state $version = do {
+                require POSIX;
+                my @u = POSIX::uname();
+                if ($u[2] =~ /\A([0-9]+(?:\.[0-9]+)+)/) {
+                        eval "v$1";
+                } else {
+                        local $" = "', `";
+                        diag "Unable to get kernel version from: `@u'";
+                        undef;
+                }
+        };
+}
+
+sub check_broken_tmpfs () {
+        return if $^O ne 'dragonfly' || kernel_version ge v6.5;
+        diag 'EVFILT_VNODE + tmpfs is broken on dragonfly <= 6.4 (have: '.
+                sprintf('%vd', kernel_version).')';
+        1;
+}
+
 sub require_bsd (;$) {
         state $ok = ($^O =~ m!\A(?:free|net|open)bsd\z! ||
                         $^O eq 'dragonfly');