[PATCHv3 2/8] dpkg-base: introduce an "apt-get source" fetch/unpack step

[Henning Schild <henning.schild@siemens.com>]

From: Henning Schild <henning.schild@siemens.com>

This creates a new task to fetch/unpack debian sources from debian
source mirrors. This is done using "apt-get source" and the new variable
APT_SRC to control the arguments.

An example where a original debian package gets rebuild will follow in a
later commit.

based on original patch by Cedric Hombourger <Cedric_Hombourger@mentor.com>

Signed-off-by: Henning Schild <henning.schild@siemens.com>
---
 meta/classes/dpkg-base.bbclass | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/meta/classes/dpkg-base.bbclass b/meta/classes/dpkg-base.bbclass
index f1b127c..2f324f9 100644
--- a/meta/classes/dpkg-base.bbclass
+++ b/meta/classes/dpkg-base.bbclass
@@ -20,6 +20,25 @@ do_adjust_git[stamp-extra-info] = "${DISTRO}-${DISTRO_ARCH}"
 inherit patch
 addtask patch after do_adjust_git before do_build
 
+SRC_APT ?= ""
+
+do_apt_fetch[depends] = "buildchroot-target:do_build"
+
+do_apt_fetch() {
+	if [ -z "${@d.getVar("SRC_APT", True).strip()}" ]; then
+		exit
+	fi
+	dpkg_do_mounts
+	E="${@ bb.utils.export_proxies(d)}"
+	sudo -E chroot --userspec=$( id -u ):$( id -g ) ${BUILDCHROOT_DIR} \
+		sh -c 'cd ${PP} && apt-get -y source ${SRC_APT}'
+	dpkg_undo_mounts
+}
+
+addtask apt_fetch after do_unpack before do_patch
+do_apt_fetch[lockfiles] += "${REPO_ISAR_DIR}/isar.lock"
+do_apt_fetch[stamp-extra-info] = "${DISTRO}-${DISTRO_ARCH}"
+
 def get_package_srcdir(d):
     s = d.getVar("S", True)
     workdir = d.getVar("WORKDIR", True)
-- 
2.19.2