/etc/resolvconf/update-libc.d/postfix is in postfix 2.11.0-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/bin/sh -e
# we only need to copy this in if the service is already running.
# if it's not running, it'll get picked up by the init script on start.
/etc/init.d/postfix status >/dev/null 2>&1 || exit 0
QUEUEDIR="$(/usr/sbin/postconf -h queue_directory 2>/dev/null || true)"
if [ -n "$QUEUEDIR" ]; then
cp /etc/resolv.conf ${QUEUEDIR}/etc/resolv.conf
/etc/init.d/postfix reload >/dev/null 2>&1 || exit 0
fi
exit 0
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