/usr/share/diskimage-builder/elements/dib-init-system/dib-init-system is in python-diskimage-builder 1.0.0-1.
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 14 15 16 17 18 19 20 21 22 | #!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
if [ -f /sbin/initctl ]; then
echo "upstart"
elif [ -f /usr/bin/systemctl ]; then
echo "systemd"
elif [ -f /sbin/init ]; then
if [ -f /bin/systemd ]; then
echo "systemd"
else
echo "sysv"
fi
else
echo "Unknown init system"
exit 1
fi
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