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Dockerfile: cleanup style, add comments.
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917a1e7bff
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@ -1,10 +1,15 @@
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ARG version=22.04
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ARG version=22.04
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# version is passed through by Docker.
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# shellcheck disable=SC2154
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# shellcheck disable=SC2154
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FROM ubuntu:"${version}"
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FROM ubuntu:"${version}"
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ARG DEBIAN_FRONTEND=noninteractive
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ARG DEBIAN_FRONTEND=noninteractive
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# We don't want to manually pin versions, happy to use whatever
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# Ubuntu thinks is best.
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# hadolint ignore=DL3008
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# hadolint ignore=DL3008
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# shellcheck disable=SC2292
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# /etc/lsb-release is checked inside the container and sets DISTRIB_RELEASE.
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# shellcheck disable=SC1091,SC2154
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RUN apt-get update \
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends software-properties-common gnupg-agent \
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&& apt-get install -y --no-install-recommends software-properties-common gnupg-agent \
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&& add-apt-repository -y ppa:git-core/ppa \
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&& add-apt-repository -y ppa:git-core/ppa \
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@ -30,7 +35,7 @@ RUN apt-get update \
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uuid-runtime \
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uuid-runtime \
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tzdata \
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tzdata \
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jq \
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jq \
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&& if [ "$(. /etc/lsb-release; echo "${DISTRIB_RELEASE}" | cut -d. -f1)" -ge 18 ]; then apt-get install gpg; fi \
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&& if [[ "$(. /etc/lsb-release; echo "${DISTRIB_RELEASE}" | cut -d. -f1)" -ge 18 ]]; then apt-get install gpg; fi \
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&& apt-get remove --purge -y software-properties-common \
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&& apt-get remove --purge -y software-properties-common \
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&& apt-get autoremove --purge -y \
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&& apt-get autoremove --purge -y \
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&& rm -rf /var/lib/apt/lists/* \
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&& rm -rf /var/lib/apt/lists/* \
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