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#!/bin/sh
set -eu
SECRET_KEY='81F90EC3CD356060'
NEXT_6_MONTHS="$(echo "$(date '+%s') + (60 * 60 * 24 * 30 * 6)" | bc)"
gpg --with-colons --fixed-list-mode --list-keys "$SECRET_KEY" |
grep -e ^pub -e ^sub |
while read -r subkey; do
EXPIRY="$(echo "$subkey" | cut -d: -f7)"
if [ -z "$EXPIRY" ]; then
continue
fi
if [ "$EXPIRY" -gt "$(date '+%s')" ] &&
[ "$EXPIRY" -lt "$NEXT_6_MONTHS" ]; then
printf 'Key %s to expire soon!.\n' \
"$(echo "$subkey" | cut -d: -f5)" >&2
exit 1
fi
done
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