/usr/lib/bird/prepare-environment is in bird-bgp 1.4.5-1+deb8u1.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #!/bin/sh
set -eu
BIRD_RUN_DIR=/run/bird
. /etc/bird/envvars
mkdir --parents "$BIRD_RUN_DIR";
if [ -n "$BIRD_RUN_USER" ]; then
if ! getent passwd $BIRD_RUN_USER >/dev/null; then
echo "Configured user '$BIRD_RUN_USER' doesn't exist."
exit 1
fi
fi
if [ -n "$BIRD_RUN_GROUP" ]; then
if ! getent group $BIRD_RUN_GROUP >/dev/null; then
echo "Configured group '$BIRD_RUN_GROUP' doesn't exist."
exit 1
fi
fi
chown --silent "$BIRD_RUN_USER:$BIRD_RUN_GROUP" "$BIRD_RUN_DIR"
chmod 775 "$BIRD_RUN_DIR"
:
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