[Buildroot] [PATCH 7/9 v2] support/download: change format of archives generated from svn

[Yann E. MORIN]

Like we recently did for git, switch the archives generated from
subversion to be reproducible whatever the tar version. Likewise
for the compression, switch to xz.

We have no in-tree users of the svn backend, that also has hashes.

Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Vincent Fazio <vfazio at xes-inc.com>
---
 package/pkg-download.mk |  3 +++
 support/download/svn    | 12 ++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/package/pkg-download.mk b/package/pkg-download.mk
index e85f844b45..8e546634ae 100644
--- a/package/pkg-download.mk
+++ b/package/pkg-download.mk
@@ -20,6 +20,9 @@ export LOCALFILES := $(call qstrip,$(BR2_LOCALFILES))
 BR_SUB_VERSION_git = _br1
 BR_SITE_METHOD_Z_git = .xz
 
+BR_SUB_VERSION_svn = _br1
+BR_SITE_METHOD_Z_svn = .xz
+
 DL_WRAPPER = support/download/dl-wrapper
 
 # DL_DIR may have been set already from the environment
diff --git a/support/download/svn b/support/download/svn
index 012f286dd9..42307eb236 100755
--- a/support/download/svn
+++ b/support/download/svn
@@ -52,12 +52,16 @@ find "${basename}" -not -type d \
        -and -not -path "./.svn/*" >"${output}.list"
 LC_ALL=C sort <"${output}.list" >"${output}.list.sorted"
 
-# Create GNU-format tarballs, since that's the format of the tarballs on
-# sources.buildroot.org and used in the *.hash files
+pax_options="delete=atime,delete=ctime,delete=mtime"
+pax_options+=",exthdr.name=%d/PaxHeaders/%f,exthdr.mtime={${date}}"
+
+# Create POSIX tarballs, since that's the format the most reproducible
 tar cf - --transform="s#^\./#${basename}/#" \
-         --numeric-owner --owner=0 --group=0 --mtime="${date}" --format=gnu \
+         --numeric-owner --owner=0 --group=0 --mtime="${date}" \
+         --format=posix \
+         --pax-option="${pax_options}" \
          -T "${output}.list.sorted" >"${output}.tar"
-gzip -6 -n <"${output}.tar" >"${output}"
+xz -9 <"${output}.tar" >"${output}"
 
 rm -f "${output}.list"
 rm -f "${output}.list.sorted"
-- 
2.25.1