/usr/bin/pkgos-reqsdiff is in openstack-pkg-tools 54.
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 | #!/bin/sh
set -e
TEMP_FILE1=`mktemp -t pkgos-reqsdiff1.XXXXXX` || exit 1
TEMP_FILE2=`mktemp -t pkgos-reqsdiff1.XXXXXX` || exit 1
pkgos-show-control-depends >${TEMP_FILE1}
pkgos-parse-requirements >${TEMP_FILE2}
diff -u ${TEMP_FILE1} ${TEMP_FILE2}
rm -f ${TEMP_FILE1} ${TEMP_FILE2}
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