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#!/bin/sh
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set -o errexit
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set -o nounset
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if [ "$#" != '1' ]
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then
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cat 1>&2 <<EOF
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Usage: $0 VERSION
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Downloads the requested version and creates a filtered source tarball.
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EOF
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exit 1
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fi
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VERSION="${1}"
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OUTDIR="${PWD}"
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TMPDIR="$(mktemp -d)"
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trap "rm -rf '${TMPDIR}'" INT TERM EXIT
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cd "${TMPDIR}"
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REPO="https://github.com/shssoichiro/oxipng"
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URL="${REPO}/archive/v${VERSION}/oxipng-${VERSION}.tar.gz"
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echo "--> Downloading: ${URL}" 1>&2
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curl -L -O "${URL}"
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ARCHIVE="$(find . -mindepth 1 -maxdepth 1 -type f -name '*.tar.gz' -print -quit)"
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echo "--> Extracting: $(basename "${ARCHIVE}")" 1>&2
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tar -xzf "${ARCHIVE}"
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echo '--> Removing tests/files/ due to licensing issues' 1>&2
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TARDIR="$(basename "${ARCHIVE}" '.tar.gz')"
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MTIME="$(stat -c '%Y' "${TARDIR}")"
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rm -rv "${TARDIR}/tests/files/"
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# Make sure the original mtime is preserved even if we modified the base
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# directory by removing something at the top level. (So far, we didn’t.)
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touch -d @"${MTIME}" "${TARDIR}"
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FILTERED="$(basename "${ARCHIVE}" .tar.gz)-filtered.tar.gz"
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echo "--> Re-archiving: ${FILTERED}" 1>&2
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# https://www.gnu.org/software/tar/manual/html_section/Reproducibility.html
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TZ=UTC LC_ALL=C tar \
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--create \
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--sort=name \
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--format=posix \
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--numeric-owner --owner=0 --group=0 \
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--mode=go+u,go-w \
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--pax-option='delete=atime,delete=ctime' \
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"${TARDIR}/" |
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gzip -9 > "${FILTERED}"
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mv -v "${FILTERED}" "${OUTDIR}"
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echo 'Done.' 1>&2
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