[Buildroot] [git commit] support/download: generate reproducible Bazaar archives

[Peter Korsgaard]

commit: http://git.buildroot.net/buildroot/commit/?id=efe7f684a66b54bf133e6b377b19653a163c89e0
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Similarly to what has previously been done for the Hg download backend,
instruct bzr to generate the archive on stdout, so that we can generate
reproducible archives.

When instructing bzr to generate the output file by itself, it uses a
temporary file that is then fed to gzip, which in turn stores the
timestamp of that file in the generated archive, whereas when the output
is generated on stdout, there is no timestamp, so the archive is then
reproducible.

Bizarely enough, we can tell 'bazaar' not to generate a bazaar in the
archive. Cool, uh? ;-]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 support/download/bzr | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/support/download/bzr b/support/download/bzr
index cec9ce8..a8a8887 100755
--- a/support/download/bzr
+++ b/support/download/bzr
@@ -32,4 +32,6 @@ _bzr() {
     eval ${BZR} "${@}"
 }
 
-_bzr export ${verbose} --root="'${basename}/'" --format=tgz "'${output}'" "'${repo}'" -r "'${rev}'"
+_bzr export ${verbose} --root="'${basename}/'" --format=tgz \
+    --per-file-timestamps - "'${repo}'" -r "'${rev}'" \
+    >"${output}"