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#!/bin/sh
if [ -d "/cryptroot/gnupghome" ]; then
export GNUPGHOME="/cryptroot/gnupghome"
fi
run_gpg() {
gpg --no-options --trust-model=always "$@"
}
decrypt_gpg () {
local console _
if ! GPG_TTY="$(tty)"; then
read console _ </proc/consoles
GPG_TTY="/dev/$console"
fi
export GPG_TTY
if ! run_gpg --decrypt -- "$1"; then
return 1
fi
return 0
}
# `gpg-connect-agent LEARN /bye` is another (lighter) way, but it's
# harder to retrieve the return code
if ! run_gpg --batch --quiet --no-tty --card-status >/dev/null; then
echo "Please insert OpenPGP SmartCard..." >&2
until run_gpg --batch --quiet --no-tty --card-status; do
sleep 1
done >/dev/null 2>&1
fi
if [ ! -x /usr/bin/gpg ]; then
echo "$0: /usr/bin/gpg is not available" >&2
exit 1
fi
if [ -z "$1" ] || [ ! -f "$1" ]; then
echo "$0: missing key as argument" >&2
exit 1
fi
decrypt_gpg "$1"
exit $?