[Buildroot] [PATCH] support/download/svn: generate reproducible svn archives

[Heiko Thiery <heiko.thiery@gmail.com>]

To generate a reproducible archive from a svn repository mainly the same
aproach is done like for the archives from a git repository.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
---
 support/download/svn | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/support/download/svn b/support/download/svn
index 542b25c0a2..505cdd58b1 100755
--- a/support/download/svn
+++ b/support/download/svn
@@ -38,4 +38,19 @@ _svn() {
 
 _svn export ${verbose} "${@}" "'${uri}@${rev}'" "'${basename}'"
 
-tar czf "${output}" "${basename}"
+# Generate the archive, sort with the C locale so that it is reproducible.
+# We do not want the .svn dir; we keep other .svn files, in case they are the
+# only files in their directory.
+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
+tar cf - --transform="s#^\./#${basename}/#" \
+         --numeric-owner --owner=0 --group=0 --mtime="${date}" --format=gnu \
+         -T "${output}.list.sorted" >"${output}.tar"
+gzip -6 -n <"${output}.tar" >"${output}"
+
+rm -f "${output}.list"
+rm -f "${output}.list.sorted"
-- 
2.20.1