docker/contrib/mkimage/busybox-static

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#!/usr/bin/env bash
set -e
rootfsDir="$1"
shift
busybox="$(which busybox 2>/dev/null || true)"
if [ -z "$busybox" ]; then
echo >&2 'error: busybox: not found'
echo >&2 ' install it with your distribution "busybox-static" package'
exit 1
fi
if ! ldd "$busybox" 2>&1 | grep -q 'not a dynamic executable'; then
echo >&2 "error: '$busybox' appears to be a dynamic executable"
echo >&2 ' you should install your distribution "busybox-static" package instead'
exit 1
fi
mkdir -p "$rootfsDir/bin"
rm -f "$rootfsDir/bin/busybox" # just in case
cp "$busybox" "$rootfsDir/bin/busybox"
(
cd "$rootfsDir"
IFS=$'\n'
modules=( $(bin/busybox --list-modules) )
unset IFS
for module in "${modules[@]}"; do
mkdir -p "$(dirname "$module")"
ln -sf /bin/busybox "$module"
done
)