Script that prepares a ssh chroot

prepare-chroot

#!/bin/bash

if (( $# < 2 )); then
    echo "Usage: $0 chroot_dir program [program ...]"
    exit 1
else
    CHROOT="$1"; shift
fi

function same_file() {
    orig="$1"
    copy="$2"

    orig_md5=$(md5sum $orig | cut -d' ' -f1)
    copy_md5=$(md5sum $copy | cut -d' ' -f1)

    [ "$orig_md5" = "$copy_md5" ] && return 0 || return 1
}

for prog in $@; do

    # copy binary if not prepared or not up2date
    prog=$(which $prog)
    if [ ! -f "${CHROOT}${prog}" ] || ! same_file "$prog" "${CHROOT}${prog}"; then
        echo "copying $prog"
        pdir=$(dirname $prog)
        [ ! -d "${CHROOT}${pdir}" ] && mkdir -p "${CHROOT}${pdir}"
        cp $prog "${CHROOT}${pdir}/"
    else
        echo "$prog already copied"
    fi

    # libs
    libs="$(ldd $prog | awk '{ print $3 }' | egrep -v ^'\(')"
    for lib in $libs; do
        # copy lib if not prepared nor not up2date
        if [ ! -f "${CHROOT}${lib}" ] || ! same_file "$lib" "${CHROOT}${lib}"; then
            echo "copying $lib"
            ldir="$(dirname $lib)"
            [ ! -d "${CHROOT}${ldir}" ] && mkdir -p "${CHROOT}${ldir}"
            cp $lib "${CHROOT}${ldir}/"
        else
            echo "$lib already copied"
        fi
    done

    # copy /lib/ld-linux* or /lib64/ld-linux* if not prepared or not up2date
    ldlinux="$(ldd $prog | grep 'ld-linux' | awk '{ print $1 }')"
    if [ ! -f "${CHROOT}${ldlinux}" ] || ! same_file "$ldlinux" "${CHROOT}${ldlinux}"; then
        echo "copying $ldlinux"
        ldlinuxdir="$(dirname $ldlinux)"
        [ ! -d "${CHROOT}${ldlinuxdir}" ] && mkdir -p "${CHROOT}${ldlinuxdir}"
        cp $ldlinux "${CHROOT}${ldlinuxdir}/"
    else
        echo "$ldlinux already copied"
    fi

done