[PATCH v8 01/15] dpkg-gbp: Use separate command to export tarball

[Uladzimir Bely <ubely@ilbers.de>]

We don't actually build the package with gbp, but only prepare it for
the building with external dpkg-buildpackage command. In case there is
no need in real build we can perform only export which will produce
upstream tarball to pass for later building.
This allows to use any build tool for later processing.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 meta/classes/dpkg-gbp.bbclass | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/meta/classes/dpkg-gbp.bbclass b/meta/classes/dpkg-gbp.bbclass
index d956e8c3..6129d734 100644
--- a/meta/classes/dpkg-gbp.bbclass
+++ b/meta/classes/dpkg-gbp.bbclass
@@ -30,5 +30,9 @@ do_install_builddeps_append() {
 }
 
 dpkg_runbuild_prepend() {
-    export GBP_PREFIX="gbp buildpackage --git-ignore-new ${GBP_EXTRA_OPTIONS} --git-builder="
+    sudo -E chroot --userspec=$( id -u ):$( id -g ) ${BUILDCHROOT_DIR} \
+        sh -c "cd ${PP}/${PPS} && gbp buildpackage --git-ignore-new --git-builder=/bin/true ${GBP_EXTRA_OPTIONS}"
+    # NOTE: `buildpackage --git-builder=/bin/true --git-pristine-tar` is used
+    # for compatibility with gbp version froms debian-stretch. In newer distros
+    # it's possible to use a subcommand `export-orig --pristine-tar`
 }
-- 
2.20.1