/lib/udev/dmsetup_env is in kpartx 0.6.4-5+deb9u1.
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 29 30 31 | #!/bin/sh
#
# Debian's dmsetup is lacking the export patch, so gather the minimum
# information here in order to get proper partition mappings via kpartx
#
# See: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=434241
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=487881
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=493078
MAJOR=$1
MINOR=$2
if [ -z "$MAJOR" -o -z "$MINOR" ]; then
echo "usage: $0 major minor"
exit 1
fi
DMSETUP="/sbin/dmsetup -c --noheadings info -j$MAJOR -m$MINOR"
DM_UUID=`$DMSETUP -oUUID`
if [ -n "$DM_UUID" ]; then
echo DM_UUID=$DM_UUID
ATTRS=`$DMSETUP -oattr`
case "$ATTRS" in
L-*) # this is the only state needed for the kpartx udev rules
echo DM_TABLE_STATE=LIVE
echo DM_STATE=ACTIVE
;;
esac
fi
echo DM_NAME=`$DMSETUP -oname`
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