Make the filtered source archive more reproducible

get_source

@@ -25,10 +25,25 @@ curl -L -O "${URL}"
 ARCHIVE="$(find . -mindepth 1 -maxdepth 1 -type f -name '*.tar.gz' -print -quit)"
 echo "--> Extracting: $(basename "${ARCHIVE}")" 1>&2
 tar -xzf "${ARCHIVE}"
+cp -p "${ARCHIVE}" /tmp/
 echo '--> Removing tests due to licensing issues' 1>&2
-rm -rvf */tests/
+TARDIR="$(basename "${ARCHIVE}" '.tar.gz')"
+MTIME="$(stat -c '%Y' "${TARDIR}")"
+rm -rvf "${TARDIR}/tests/"
+# Restore the original mtime even though we modified the base directory by
+# removing the tests.
+touch -d @"${MTIME}" "${TARDIR}"
 FILTERED="$(basename "${ARCHIVE}" .tar.gz)-filtered.tar.xz"
 echo "--> Re-archiving: ${FILTERED}" 1>&2
-tar -c "${FILTERED}" */ | xz -9e > "${FILTERED}"
+# https://www.gnu.org/software/tar/manual/html_section/Reproducibility.html
+TZ=UTC LC_ALL=C tar \
+    --create --verbose \
+    --sort=name \
+    --format=posix \
+    --numeric-owner --owner=0 --group=0 \
+    --mode=go+u,go-w \
+    --pax-option='delete=atime,delete=ctime' \
+    "${TARDIR}/" |
+  xz -9e > "${FILTERED}"
 mv -v "${FILTERED}" "${OUTDIR}"
 echo 'Done.' 1>&2

sources

@@ -1 +1 @@
-SHA512 (chardet-5.2.0-filtered.tar.xz) = 4f865b958503596cdaf690d0cb586c7c477419ca528b4701d93577c34764fcbab2246d79b82fe25a06246c59cedb9344ec332540efb76cc02d49158fb4903974
+SHA512 (chardet-5.2.0-filtered.tar.xz) = 4ed51684c86bab8f4822035d180e375c7f4817e29b172363d1d5183043f0022f2c2245958a4b00064e6dda756c0c1d283bed9c41026c1be93fe87b13940e455c