From d66bd6e5e9ae96676e805cce43937a0528cebe1b Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <julian.klode@canonical.com>
Date: Wed, 8 Aug 2018 15:19:20 +0200
Subject: Set DPKG_FRONTEND_LOCKED as needed when doing selection changes

We forgot to set the variable for the selection changes. Let's
set it for that and some other dpkg calls.

Regression-Of: c2c8b4787b0882234ba2772ec7513afbf97b563a
(cherry picked from commit 55489885b51b02b7f74e601a393ecaefd1f71f9c)
---
 apt-pkg/deb/debsystem.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/apt-pkg/deb/debsystem.cc b/apt-pkg/deb/debsystem.cc
index ee42cc6a7..0b8bb6cb4 100644
--- a/apt-pkg/deb/debsystem.cc
+++ b/apt-pkg/deb/debsystem.cc
@@ -394,6 +394,11 @@ pid_t debSystem::ExecDpkg(std::vector<std::string> const &sArgs, int * const inp
       if (DiscardOutput == true)
 	 dup2(nullfd, STDERR_FILENO);
       debSystem::DpkgChrootDirectory();
+
+      if (_system != nullptr && _system->IsLocked() == true)
+      {
+	 setenv("DPKG_FRONTEND_LOCKED", "true", 1);
+      }
       execvp(Args[0], (char**) &Args[0]);
       _error->WarningE("dpkg", "Can't execute dpkg!");
       _exit(100);
-- 
cgit v1.2.3