--- /dev/null
+#!perl -w
+# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+# ensure mbsync and offlineimap compatibility
+use strict;
+use Test::More;
+use File::Path qw(mkpath);
+use PublicInbox::TestCommon;
+use PublicInbox::Spawn qw(which spawn);
+my $inboxdir = $ENV{GIANT_INBOX_DIR};
+(defined($inboxdir) && -d $inboxdir) or
+ plan skip_all => "GIANT_INBOX_DIR not defined for $0";
+plan skip_all => "bad characters in $inboxdir" if $inboxdir =~ m![^\w\.\-/]!;
+my ($tmpdir, $for_destroy) = tmpdir();
+my $cfg = "$tmpdir/cfg";
+my $mailbox = 'inbox.test';
+{
+ open my $fh, '>', $cfg or BAIL_OUT "open: $!";
+ print $fh <<EOF or BAIL_OUT "print: $!";
+[publicinbox "test"]
+ newsgroup = $mailbox
+ address = oimap\@example.com
+ inboxdir = $inboxdir
+EOF
+ close $fh or BAIL_OUT "close: $!";
+}
+my ($out, $err) = ("$tmpdir/stdout.log", "$tmpdir/stderr.log");
+my $sock = tcp_server();
+my $cmd = [ '-imapd', '-W0', "--stdout=$out", "--stderr=$err" ];
+my $env = { PI_CONFIG => $cfg };
+my $td = start_script($cmd, $env, { 3 => $sock }) or BAIL_OUT "-imapd: $?";
+{
+ my $c = tcp_connect($sock);
+ like(readline($c), qr/CAPABILITY /, 'got greeting');
+}
+my ($host, $port) = ($sock->sockhost, $sock->sockport);
+my %pids;
+
+SKIP: {
+ mkpath([map { "$tmpdir/oimapdir/$_" } qw(cur new tmp)]);
+ my $oimap = which('offlineimap') or skip 'no offlineimap(1)', 1;
+ open my $fh, '>', "$tmpdir/.offlineimaprc" or BAIL_OUT "open: $!";
+ print $fh <<EOF or BAIL_OUT "print: $!";
+[general]
+accounts = test
+socktimeout = 10
+fsync = false
+
+[Account test]
+localrepository = l.test
+remoterepository = r.test
+
+[Repository l.test]
+type = Maildir
+localfolders = ~/oimapdir
+
+[Repository r.test]
+type = IMAP
+ssl = no
+remotehost = $host
+remoteport = $port
+remoteuser = anonymous
+remotepass = Hunter2
+
+# python-imaplib2 times out on select/poll when compression is enabled
+# <https://bugs.debian.org/961713>
+usecompression = no
+EOF
+ close $fh or BAIL_OUT "close: $!";
+ my $cmd = [ $oimap, qw(-o -q -u quiet) ];
+ my $pid = spawn($cmd, { HOME => $tmpdir }, { 1 => 2 });
+ $pids{$pid} = $cmd;
+}
+
+SKIP: {
+ mkpath([map { "$tmpdir/mbsyncdir/test/$_" } qw(cur new tmp)]);
+ my $mbsync = which('mbsync') or skip 'no mbsync(1)', 1;
+ open my $fh, '>', "$tmpdir/.mbsyncrc" or BAIL_OUT "open: $!";
+ print $fh <<EOF or BAIL_OUT "print: $!";
+Create Slave
+SyncState *
+Remove None
+FSync no
+
+MaildirStore local
+Path ~/mbsyncdir/
+Inbox ~/mbsyncdir/test
+SubFolders verbatim
+
+IMAPStore remote
+Host $host
+Port $port
+User anonymous
+Pass Hunter2
+SSLType None
+UseNamespace no
+# DisableExtension COMPRESS=DEFLATE
+
+Channel "test"
+Master ":remote:inbox"
+Slave ":local:test"
+Expunge None
+Sync PullNew
+Patterns *
+EOF
+ close $fh or BAIL_OUT "close: $!";
+ my $cmd = [ $mbsync, qw(-aqq) ];
+ my $pid = spawn($cmd, { HOME => $tmpdir }, { 1 => 2 });
+ $pids{$pid} = $cmd;
+}
+
+while (scalar keys %pids) {
+ my $pid = waitpid(-1, 0) or next;
+ my $cmd = delete $pids{$pid} or next;
+ is($?, 0, join(' ', @$cmd, 'done'));
+}
+
+if (my $sec = $ENV{TEST_PERSIST}) {
+ diag "sleeping ${sec}s, imap://$host:$port/$mailbox available";
+ diag "tmpdir=$tmpdir (Maildirs available)";
+ diag "stdout=$out";
+ diag "stderr=$err";
+ diag "pid=$td->{pid}";
+ sleep $sec;
+}
+$td->kill;
+$td->join;
+is($?, 0, 'no error on -imapd exit');
+done_testing;