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It can be accessed and reviewed at: https://github.com/lxc/distrobuilder/pull/173

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=== Description (from pull-request) ===
Signed-off-by: Thomas Hipp <[email protected]>
From 2dd2a9a84697fec25e8bbdc9b7100a5fa45fcdb5 Mon Sep 17 00:00:00 2001
From: Thomas Hipp <[email protected]>
Date: Tue, 7 May 2019 12:18:30 +0200
Subject: [PATCH] sources: Use fallback openSUSE image if needed

Signed-off-by: Thomas Hipp <[email protected]>
---
 sources/opensuse-http.go | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/sources/opensuse-http.go b/sources/opensuse-http.go
index bac65aa..0889ef2 100644
--- a/sources/opensuse-http.go
+++ b/sources/opensuse-http.go
@@ -11,6 +11,7 @@ import (
        "path"
        "path/filepath"
        "regexp"
+       "sort"
        "strings"
 
        lxd "github.com/lxc/lxd/shared"
@@ -166,14 +167,27 @@ func (s *OpenSUSEHTTP) getTarballName(u *url.URL, 
release, arch string) string {
        nodes := htmlquery.Find(doc, `//a/@href`)
        re := 
regexp.MustCompile(fmt.Sprintf("^opensuse-%s-image.*%s.*\\.tar.xz$", release, 
arch))
 
+       var builds []string
+
        for _, n := range nodes {
                text := htmlquery.InnerText(n)
 
-               if !re.MatchString(text) || strings.Contains(text, "Build") {
+               if !re.MatchString(text) {
                        continue
                }
 
-               return text
+               if strings.Contains(text, "Build") {
+                       builds = append(builds, text)
+               } else {
+                       return text
+               }
+       }
+
+       if len(builds) > 0 {
+               // Unfortunately, the link to the latest build is missing, 
hence we need
+               // to manually select the latest build.
+               sort.Strings(builds)
+               return builds[len(builds)-1]
        }
 
        return ""
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