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2de354af77
We are not zeroing the free space properly before signing official images. This patch fixes it by using fstrim instead of dd. More info can be found in CL:751809. BRANCH=none BUG=chromium:780291 TEST=used sign_official_build.sh to sign two recovery images (these images produced <zero-space> file) with dev keys. Then generated delta update between the two new images. This time there was no <zero-space> file between the two images. Change-Id: Ib97fb206f5c8bcfd97c43d075990c7fcdaad6f7e Reviewed-on: https://chromium-review.googlesource.com/848237 Commit-Ready: Amin Hassani <ahassani@chromium.org> Tested-by: Amin Hassani <ahassani@chromium.org> Reviewed-by: Mike Frysinger <vapier@chromium.org>