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

Yann E. MORIN yann.morin.1998 at free.fr
Sat Jan 2 15:06:42 UTC 2016


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>
---
 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}"
-- 
1.9.1



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