From 8dc465a4eb4bf7045c6cffa9cd50e217f3337589 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 5 Sep 2019 12:59:16 +0100
Subject: [PATCH] dgit: Use distro-info-data to resolve unknown suites to
 distros

Closes: #931212
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 debian/control |  5 +++--
 dgit           | 17 +++++++++++++++++
 dgit.1         |  4 ++++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/debian/control b/debian/control
index 3e82d8d8..3edda13d 100644
--- a/debian/control
+++ b/debian/control
@@ -15,8 +15,9 @@ Depends: perl, libdpkg-perl, git-core, devscripts, dpkg-dev,
          coreutils (>= 8.23-1~),
          libdigest-sha-perl, dput, curl, apt,
          libjson-perl, ca-certificates,
-         libtext-iconv-perl, libtext-glob-perl, libwww-curl-perl
-Recommends: ssh-client
+         libtext-iconv-perl, libtext-glob-perl, libwww-curl-perl,
+         libtext-csv-perl
+Recommends: ssh-client, distro-info-data
 Suggests: sbuild | pbuilder | cowbuilder
 Architecture: all
 Description: git interoperability with the Debian archive
diff --git a/dgit b/dgit
index fde8d615..962bca1a 100755
--- a/dgit
+++ b/dgit
@@ -46,6 +46,7 @@ use Digest::SHA;
 use Digest::MD5;
 use List::MoreUtils qw(pairwise);
 use Text::Glob qw(match_glob);
+use Text::CSV;
 use Fcntl qw(:DEFAULT :flock);
 use Carp;
 
@@ -867,6 +868,22 @@ sub access_basedistro__noalias () {
 		return $kl->{$k};
 	    }
 	}
+	foreach my $csvf (</usr/share/distro-info/*.csv>) {
+	    my $csv_distro =
+		$csvf =~ m{/(\w+)\.csv$} ? $1 : do {
+		    printdebug "skipping $csvf\n";
+		    next;
+		};
+	    my $csv = Text::CSV->new({ binary => 1, auto_diag => 2 }) or die;
+	    my $fh = new IO::File $csvf, "<:encoding(utf8)"
+		or die "open $csvf: $!";
+	    while (my $cols = $csv->getline($fh)) {
+		next unless $cols->[2] eq $isuite;
+		return $csv_distro;
+	    }
+	    die "$csvf $!" if $fh->error;
+	    close $fh;
+	}
 	return cfg("dgit.default.distro");
     }
 }
diff --git a/dgit.1 b/dgit.1
index 29825c2c..93b8ed68 100644
--- a/dgit.1
+++ b/dgit.1
@@ -1359,6 +1359,10 @@ may be a glob pattern.
 .TP
 .BI dgit.default.distro " distro"
 The default distro for an unknown suite.
+
+This is only used if no
+.BI /usr/share/distro-info/ somedistro .csv
+mentions the specified suite.
 .TP
 .BI dgit.default.default-suite " suite"
 The default suite (eg for clone).
-- 
2.30.2