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To pull a new upstream snapshot, given lp:curtin in ../trunk:
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uver=0.1.0 # the *next* upstream version
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revno=$(cd "$trunk" && bzr revno)
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pversion=$(dpkg-parsechangelog --show-field Version)
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prevno=$(echo "$pversion" | sed 's,.*bzr\([0-9]\+\)-.*,\1,')
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version=${uver}~bzr${revno}
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tarball=cloud-init-${version}.tar.gz
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bzr export --format=tgz --revision=${revno} "$tarball" "${trunk}"
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bzr merge-upstream "$tarball" --version=${version}
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( cd "$trunk" && bzr log -r $(($prevno+1)).. ) > new-changes.log
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Then, edit changelog and look at entries in 'new-changes.log'.