Copy a command and its dependencies to the specified chroot filesystem

cpchroot

#!/bin/sh

##
# Copy a command and its dependencies to the specified chroot filesystem
#
# Example:
#  cpchroot /var/chroot bash cp ls mkdir mv
#
# Copyright (c) 2016 Timothy Boronczyk
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     (1) Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer. 
#
#     (2) Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.  
#
#     (3)The name of the author may not be used to
#     endorse or promote products derived from this software without
#     specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

usage()(
    echo "Usage: $(basename "$0") chroot cmd [...]"
    exit 1
)

deplibs()(
    shared=$(objdump -p "$1" | awk '/NEEDED/ { print $2 }')
    for s in $shared; do
        dep=$(find / ! -path "$2*" -name "$s" -executable -print -quit)
        echo "$dep"
        deplibs "$dep" "$2"
    done
)

main()(
    dir="$1"
    shift
    while [ $# -gt 0 ]; do
        cmd=$(which "$1")
        cp "$cmd" "$dir/$cmd"
        for dep in $(deplibs "$cmd" "$dir" | sort -u); do
            if [ ! -f "$dir/$dep" ]; then
                cp "$dep" "$dir/$dep"
            fi
        done
        shift
    done
)

[ $# -lt 2 ] && usage
main "$@"