From 229e73afa4d6e862262f898a7e58942c90939306 Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <julian.klode@canonical.com>
Date: Mon, 11 Jan 2021 11:39:38 +0100
Subject: Call ischroot with -t

We interpreted "cannot detect chroot" as "not a chroot", but it's
arguably the better idea to detect it as a chroot, to avoid new behavior
from phased updations in situations where it's unclear (no /proc mounted
or stuff).
---
 apt-pkg/aptconfiguration.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/apt-pkg/aptconfiguration.cc b/apt-pkg/aptconfiguration.cc
index e88029f58..671c3d553 100644
--- a/apt-pkg/aptconfiguration.cc
+++ b/apt-pkg/aptconfiguration.cc
@@ -529,6 +529,7 @@ bool Configuration::isChroot()
 	    auto binary = _config->FindFile("Dir::Bin::ischroot", "/usr/bin/ischroot");
 	    const char *const Args[] = {
 	       binary.c_str(),
+	       "-t",
 	       nullptr};
 	    execvp(Args[0], const_cast<char **>(Args));
 	    _exit(127);
-- 
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