This file is indexed.

/usr/src/glibc/debian/debhelper.in/libc.postrm is in eglibc-source 2.19-0ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

if [ "$1" = remove ]; then
    if command -v suidunregister >/dev/null 2>&1 && [ -e /etc/suid.conf ]; then
	if [ -x /usr/lib/pt_chown ]; then
	    suidunregister -s LIBC /usr/lib/pt_chown
	elif [ -x /usr/libexec/pt_chown ]; then
	    suidunregister -s LIBC /usr/libexec/pt_chown
	fi
    fi
    # When both the multiarch and the corresponding biarch packages are
    # installed, removing the multiarch package will remove the dynamic
    # linker. Recreate it in the postinst.
    ARCH=${DPKG_MAINTSCRIPT_ARCH:-$(dpkg --print-architecture)}
    case "${ARCH}" in
        kfreebsd-i386 | s390 | powerpc)
            target="/lib32/ld.so.1"
            ;;
        i386 | sparc)
            target="/lib32/ld-linux.so.2"
            ;;
        *)
            target="$(dpkg-query -L LIBC-${ARCH} 2>/dev/null | grep -E '/lib.*/ld-[0-9.]+\.so$' || true)"
            ;;
    esac
    if [ -f "$target" ] && ! [ -f RTLD_SO ] ; then
        ln -sf ${target#$(dirname RTLD_SO)/} RTLD_SO
    fi
fi

if [ "$1" = deconfigure ]; then
    :; # blah, do something useful with ldso
fi

#if [ "$1" = purge ]; then
#    update-rc.d mountkernfs remove > /dev/null
#fi

#DEBHELPER#

exit 0