From 3ace0c6e648e8ca6649c46d650b21fdc3ce2f780 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <hans@eds.org>
Date: Wed, 26 Sep 2018 10:44:09 +0200
Subject: [PATCH] downgrade tar to v1.29 if v1.30 is installed

tar v1.30 breaks pristine-tar's ability to work with commits created
by older versions of tar
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901952
---
 gitlab-ci-git-buildpackage | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/gitlab-ci-git-buildpackage b/gitlab-ci-git-buildpackage
index b779cd0..9a34012 100755
--- a/gitlab-ci-git-buildpackage
+++ b/gitlab-ci-git-buildpackage
@@ -31,11 +31,22 @@ if [[ $debversion = *-* ]]; then
   git clean -fdx
   git reset --hard
   git fetch --all
-  git checkout -B pristine-tar origin/pristine-tar || ( \
+  if git checkout -B pristine-tar origin/pristine-tar; then
+    tar_version=`dpkg -s tar | grep '^Version:'`
+    if [[ $tar_version == "Version: 1.30"* ]]; then
+      echo "WARNING: tar v1.30 breaks pristine-tar when working with commits created by older versions of tar https://bugs.debian.org/901952, downgrading to tar 1.29b-1.1"
+      printf 'Package: tar\nPin: version 1.30+dfsg-2\nPin-Priority: -1\n' \
+          > /etc/apt/preferences.d/ban-broken-tar.pref
+      $apt_get install --no-install-recommends wget
+      wget -q http://deb.debian.org/debian/pool/main/t/tar/tar_1.29b-1.1_amd64.deb
+      dpkg -i tar_1.29b-1.1_amd64.deb
+      rm -f tar_1.29b-1.1_amd64.deb
+    fi
+  else
       echo "no pristine-tar branch, trying uscan";
       apt_get_auto_install gnupg2 libwww-perl;
       uscan --verbose --download-current-version --force-download --rename --skip-signature;
-  )
+  fi
 else
   echo "building native package version $debversion"
 fi