From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 18 Jun 2015 06:41:45 +0000 (+0000)
Subject: ipkg-build: suppress timestamps in gzip headers
X-Git-Url: http://git.ozo.com/?a=commitdiff_plain;ds=sidebyside;h=685c546d0559db07d918e4e153b76ffd39e412f0;p=openwrt-github%2F.git

ipkg-build: suppress timestamps in gzip headers

When creating control.tar.gz, data.tar.gz and $package.ipk
tar compresses them with default gzip options.
This includes build timestamps in their gzip headers.
By setting the GZIP env variable to -n, gzip no longer embeds
them, which is a step towards reproducibility.

See also [1] for more detailed motivations.

[1]: https://wiki.debian.org/ReproducibleBuilds/About

Signed-off-by: Reiner Herrmann <reiner@reiner-h.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46026 3c298f89-4303-0410-b956-a3cf2f4a3e73
---

diff --git a/scripts/ipkg-build b/scripts/ipkg-build
index c466f28681..6787ed4199 100755
--- a/scripts/ipkg-build
+++ b/scripts/ipkg-build
@@ -13,6 +13,7 @@ version=1.0
 FIND="$(which find)"
 FIND="${FIND:-$(which gfind)}"
 TAR="${TAR:-$(which tar)}"
+export GZIP="-n"
 
 ipkg_extract_value() {
 	sed -e "s/^[^:]*:[[:space:]]*//"