util/release: make release archives reproducible

tar doesn't sort by default and takes the order of the OS which is in
most cases the order of creation. Sort by name and set influencing
environment TZ and language to be reproducible.

Change-Id: I3d043952417000d12e81353677f1ea4aa2da4fc1
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: https://review.coreboot.org/16556
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
diff --git a/util/release/build-release b/util/release/build-release
index d13e038..11e7177 100755
--- a/util/release/build-release
+++ b/util/release/build-release
@@ -9,6 +9,13 @@
 GPG_KEY_ID=${4}
 
 set -e
+
+# set local + tz to be reproducible
+LC_ALL=C
+LANG=C
+TZ=UTC
+export LC_ALL LANG TZ
+
 if [ -z "${VERSION_NAME}" ] || [ "${VERSION_NAME}" = "--help" ]; then
 	echo "usage: $0 <version> [commit id] [gpg key id] [username]"
 	echo "tags a new coreboot version and creates a tar archive"
@@ -32,8 +39,8 @@
 printf "${VERSION_NAME}-$(git log --pretty=%H|head -1)\n" > .coreboot-version
 tstamp=$(git log --pretty=format:%ci -1)
 cd ..
-tar --mtime="$tstamp" --owner=coreboot:1000 --group=coreboot:1000 --exclude-vcs --exclude=coreboot-${VERSION_NAME}/3rdparty/blobs -cvf - coreboot-${VERSION_NAME} |xz -9 > coreboot-${VERSION_NAME}.tar.xz
-tar --mtime="$tstamp" --owner=coreboot:1000 --group=coreboot:1000 --exclude-vcs -cvf - coreboot-${VERSION_NAME}/3rdparty/blobs |xz -9 > coreboot-blobs-${VERSION_NAME}.tar.xz
+tar --sort=name --mtime="$tstamp" --owner=coreboot:1000 --group=coreboot:1000 --exclude-vcs --exclude=coreboot-${VERSION_NAME}/3rdparty/blobs -cvf - coreboot-${VERSION_NAME} |xz -9 > coreboot-${VERSION_NAME}.tar.xz
+tar --sort=name --mtime="$tstamp" --owner=coreboot:1000 --group=coreboot:1000 --exclude-vcs -cvf - coreboot-${VERSION_NAME}/3rdparty/blobs |xz -9 > coreboot-blobs-${VERSION_NAME}.tar.xz
 if [ -n "${GPG_KEY_ID}" ]; then
 	gpg2 --armor --local-user ${GPG_KEY_ID} --output coreboot-${VERSION_NAME}.tar.xz.sig --detach-sig coreboot-${VERSION_NAME}.tar.xz
 	gpg2 --armor --local-user ${GPG_KEY_ID} --output coreboot-blobs-${VERSION_NAME}.tar.xz.sig --detach-sig coreboot-blobs-${VERSION_NAME}.tar.xz