From 27fca53e1de0dcf2108c13d07f0f21635bdd496d Mon Sep 17 00:00:00 2001
From: Gioele Barabucci <gioele@svario.it>
Date: Sat, 20 Aug 2022 17:05:11 +0200
Subject: [PATCH] mmdebstrap: Show APT's dependency trace when in debug mode

A dependency trace is a powerful tool to debug issues related to
APT's selection of packages, especially in custom mode.

Thus it makes sense to ask APT to output a dependency trace when
`mmdebstrap` is run with the `--debug` flag.
---
 mmdebstrap | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mmdebstrap b/mmdebstrap
index 5db65bb..b61b4cd 100755
--- a/mmdebstrap
+++ b/mmdebstrap
@@ -961,6 +961,16 @@ sub run_apt_download_progress {
     } else {
         info "downloading packages with apt...";
     }
+
+    if ($verbosity_level >= 3) {
+        my @apt_debug_opts = qw(
+            -oDebug::pkgProblemResolver=true
+            -oDebug::pkgDepCache::Marker=1
+            -oDebug::pkgDepCache::AutoInstall=1
+	);
+	push @{ $options->{APT_ARGV} }, @apt_debug_opts;
+    }
+
     pipe my $rfh, my $wfh;
     my $pid = open my $fh, '-|' // error "fork() failed: $!";
     if ($pid == 0) {